Refactored database data model to improve speed and reduce memory

consumption

com.minres.scviewer.database.leveldb/src/com/minres/scviewer/database/leveldb/LevelDBLoader.java

@@ -24,7 +24,7 @@ public class LevelDBLoader implements IWaveformDbLoader {
 		return value.getBytes(UTF_8);
 	}
 
-	private StringDBWrapper levelDb;
+	private TxDBWrapper levelDb;
 	private IWaveformDb db;
 	private Long maxTime=null;
 	private List<RelationType> usedRelationsList = new ArrayList<>();
@@ -33,7 +33,10 @@ public class LevelDBLoader implements IWaveformDbLoader {
 	public boolean load(IWaveformDb db, File inp) throws Exception {
 		try {
 			this.db=db;
-			levelDb = new StringDBWrapper(new Options(), inp);
+			levelDb = new TxDBWrapper(new Options(), inp);
+			JSONObject configVal = new JSONObject(levelDb.get("__config"));
+			if(!configVal.isEmpty())
+				levelDb.setTimeResolution(configVal.getLong("resolution"));
 		} catch(Exception e) {
 			return false;
 		}
@@ -55,15 +58,15 @@ public class LevelDBLoader implements IWaveformDbLoader {
 				maxTime = 0L;
 			else {
 				String[] token = val.getKey().split("~");
-				maxTime = Long.parseLong(token[2], 16);
+				maxTime = Long.parseLong(token[2], 16)*levelDb.getTimeResolution();
 			}
 		}
 		return maxTime;
 	}
 
 	@Override
-	public List<IWaveform<? extends IWaveformEvent>> getAllWaves() {
+	public List<IWaveform> getAllWaves() {
-		List<IWaveform<? extends IWaveformEvent>> streams=new ArrayList<IWaveform<? extends IWaveformEvent>>();
+		List<IWaveform> streams=new ArrayList<IWaveform>();
 		SeekingIterator<String, String> it = levelDb.iterator();
 		it.seek("s~");
 		while(it.hasNext()) {

com.minres.scviewer.database.leveldb/src/com/minres/scviewer/database/leveldb/TxDBWrapper.java

@@ -11,17 +11,19 @@ import org.iq80.leveldb.ReadOptions;
 import org.iq80.leveldb.Snapshot;
 import org.iq80.leveldb.impl.DbImpl;
 import org.iq80.leveldb.impl.SeekingIterator;
-import org.json.*;
 
-class StringDBWrapper {
+class TxDBWrapper {
 	private final Options options;
+	private final ReadOptions ro = new ReadOptions();
 	private final File databaseDir;
 	private DbImpl db;
+	private long timeResolution=1L;;
 
-	StringDBWrapper(Options options, File databaseDir) throws IOException {
+	TxDBWrapper(Options options, File databaseDir) throws IOException {
-		this.options = options.verifyChecksums(true).createIfMissing(false).errorIfExists(false);
+		this.options = options.verifyChecksums(true).createIfMissing(false).errorIfExists(false).cacheSize(64*1024*1024);
 		this.databaseDir = databaseDir;
 		this.db = new DbImpl(options, databaseDir);
+		ro.snapshot(db.getSnapshot());
 	}
 
 	public String get(String key) {
@@ -33,11 +35,8 @@ class StringDBWrapper {
 	}
 
 	public String get(String key, Snapshot snapshot) {
-		byte[] slice = db.get(LevelDBLoader.toByteArray(key), new ReadOptions().snapshot(snapshot));
+		byte[] slice = db.get(LevelDBLoader.toByteArray(key), ro);
-		if (slice == null) {
+		return slice == null? null : new String(slice, UTF_8);
-			return null;
-		}
-		return new String(slice, UTF_8);
 	}
 
 	public void put(String key, String value) {
@@ -57,7 +56,10 @@ class StringDBWrapper {
 	}
 
 	public void close() {
+		try {
+			ro.snapshot().close();
 			db.close();
+		} catch (IOException e) {} // ignore any error
 	}
 
 	public long size(String start, String limit) {
@@ -73,7 +75,16 @@ class StringDBWrapper {
 	}
 
 	public void reopen(Options options) throws IOException {
-		db.close();
+		this.close();
 		db = new DbImpl(options.verifyChecksums(true).createIfMissing(false).errorIfExists(false), databaseDir);
+		ro.snapshot(db.getSnapshot());
+	}
+	
+	public long getTimeResolution() {
+		return timeResolution;
+	}
+	
+	public void setTimeResolution(long resolution) {
+		this.timeResolution = resolution;
 	}
 }

com.minres.scviewer.database.leveldb/src/com/minres/scviewer/database/leveldb/TxStream.java

@@ -10,9 +10,6 @@
  *******************************************************************************/
 package com.minres.scviewer.database.leveldb;
 
-import java.beans.IntrospectionException;
-import java.lang.reflect.InvocationTargetException;
-import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
@@ -23,7 +20,6 @@ import org.iq80.leveldb.impl.SeekingIterator;
 import org.json.JSONObject;
 
 import java.util.NavigableMap;
-import java.util.StringTokenizer;
 import java.util.TreeMap;
 import java.util.Vector;
 
@@ -34,12 +30,11 @@ import com.minres.scviewer.database.ITxGenerator;
 import com.minres.scviewer.database.ITxStream;
 import com.minres.scviewer.database.IWaveform;
 import com.minres.scviewer.database.IWaveformDb;
-import com.minres.scviewer.database.IWaveformEvent;
 import com.minres.scviewer.database.RelationType;
 
 public class TxStream extends HierNode implements ITxStream<ITxEvent> {
 
-	private StringDBWrapper levelDb;
+	private TxDBWrapper levelDb;
 
 	private String fullName;
 	
@@ -59,7 +54,7 @@ public class TxStream extends HierNode implements ITxStream<ITxEvent> {
 
 	private List<RelationType> usedRelationsList;
 	
-	public TxStream(StringDBWrapper database, IWaveformDb waveformDb, JSONObject object) {
+	public TxStream(TxDBWrapper database, IWaveformDb waveformDb, JSONObject object) {
 		super(object.get("name").toString());
 		this.levelDb=database;
 		this.db=waveformDb;
@@ -93,10 +88,11 @@ public class TxStream extends HierNode implements ITxStream<ITxEvent> {
 		if(generators==null){
 			generators=new TreeMap<Long, TxGenerator>();
 			SeekingIterator<String, String> it = levelDb.iterator();
-			it.seek("sg~"+String.format("%016x", id));
+			String key="sg~"+String.format("%016x", id);
+			it.seek(key);
 			while(it.hasNext()) {
 				Entry<String, String> val = it.next();
-				if(!val.getKey().startsWith("sg~")) break;
+				if(!val.getKey().startsWith(key)) break;
 				JSONObject jVal = new JSONObject(val.getValue());
 				generators.put(jVal.getLong("id"), new TxGenerator(this, jVal));
 			}
@@ -107,7 +103,7 @@ public class TxStream extends HierNode implements ITxStream<ITxEvent> {
 	@Override
 	public int getMaxConcurrency() {
 		if(maxConcurrency==null){
-				maxConcurrency=1;
+				getTransactions();
 		}
 		return maxConcurrency;
 	}
@@ -117,8 +113,9 @@ public class TxStream extends HierNode implements ITxStream<ITxEvent> {
 		if(events==null){
 			events=new TreeMap<Long, List<ITxEvent>>();
 			for(Entry<Long, ITx> entry:getTransactions().entrySet()){
-				putEvent(new TxEvent(TxEvent.Type.BEGIN, entry.getValue()));
+				ITx tx = entry.getValue();
-				putEvent(new TxEvent(TxEvent.Type.END, entry.getValue()));
+				putEvent(new TxEvent(TxEvent.Type.BEGIN, tx));
+				putEvent(new TxEvent(TxEvent.Type.END, tx));
 			}	
 		}
 		return events;
@@ -139,16 +136,21 @@ public class TxStream extends HierNode implements ITxStream<ITxEvent> {
 		if(transactions==null){
 			if(generators==null) getGenerators();
 			transactions = new TreeMap<Long, ITx>();
+			maxConcurrency=0;
 			SeekingIterator<String, String> it = levelDb.iterator();
-			it.seek("sgx~"+String.format("%016x", id));
+			String key = "sgx~"+String.format("%016x", id);
+			it.seek(key);
 			while(it.hasNext()) {
 				Entry<String, String> val = it.next();
-				if(!val.getKey().startsWith("sgx~")) break;
+				if(!val.getKey().startsWith(key)) break;
 				String[] token = val.getKey().split("~");
 				long gid = Long.parseLong(token[2], 16); // gen id
 				long id = Long.parseLong(token[3], 16); // tx id
-				transactions.put(id, new Tx(levelDb, this, generators.get(gid), id));
+				ITx tx = new Tx(levelDb, this, generators.get(gid), id);
+				transactions.put(id, tx);
+				maxConcurrency= Math.max(maxConcurrency, tx.getConcurrencyIndex());
 			}
+			maxConcurrency++;
 		}
 		return transactions;
 	}
@@ -169,7 +171,7 @@ public class TxStream extends HierNode implements ITxStream<ITxEvent> {
 	}
 
 	@Override
-	public Boolean equals(IWaveform<? extends IWaveformEvent> other) {
+	public Boolean equals(IWaveform other) {
 		return(other instanceof TxStream && this.getId()==other.getId());
 	}
 

com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/SQLiteDbLoader.java

@@ -13,6 +13,7 @@ package com.minres.scviewer.database.sqlite;
 import java.beans.IntrospectionException;
 import java.io.File;
 import java.io.FileInputStream;
+import java.io.FileNotFoundException;
 import java.lang.reflect.InvocationTargetException;
 import java.sql.SQLException;
 import java.util.ArrayList;
@@ -60,9 +61,9 @@ public class SQLiteDbLoader implements IWaveformDbLoader {
 	}
 
 	@Override
-	public List<IWaveform<? extends IWaveformEvent>> getAllWaves() {
+	public List<IWaveform> getAllWaves() {
 		SQLiteDatabaseSelectHandler<ScvStream> handler = new SQLiteDatabaseSelectHandler<ScvStream>(ScvStream.class, database);
-		List<IWaveform<? extends IWaveformEvent>> streams=new ArrayList<IWaveform<? extends IWaveformEvent>>();
+		List<IWaveform> streams=new ArrayList<IWaveform>();
 		try {
 			for(ScvStream scvStream:handler.selectObjects()){
 				TxStream stream = new TxStream(database, db, scvStream);
@@ -81,6 +82,7 @@ public class SQLiteDbLoader implements IWaveformDbLoader {
 	@Override
 	public boolean load(IWaveformDb db, File file) throws Exception {
 		this.db=db;
+		try {
 			FileInputStream fis = new FileInputStream(file);
 			byte[] buffer = new byte[x.length];
 			int read = fis.read(buffer, 0, x.length);
@@ -88,7 +90,9 @@ public class SQLiteDbLoader implements IWaveformDbLoader {
 			if (read == x.length)
 				for (int i = 0; i < x.length; i++)
 					if (buffer[i] != x[i])	return false;
-
+		} catch(FileNotFoundException e) {
+			return false;
+		}
 		database=new SQLiteDatabase(file.getAbsolutePath());
 		database.setData("TIMERESOLUTION", 1L);
 		SQLiteDatabaseSelectHandler<ScvSimProps> handler = new SQLiteDatabaseSelectHandler<ScvSimProps>(ScvSimProps.class, database);

com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/TxStream.java

@@ -29,7 +29,6 @@ import com.minres.scviewer.database.ITxGenerator;
 import com.minres.scviewer.database.ITxStream;
 import com.minres.scviewer.database.IWaveform;
 import com.minres.scviewer.database.IWaveformDb;
-import com.minres.scviewer.database.IWaveformEvent;
 import com.minres.scviewer.database.RelationType;
 import com.minres.scviewer.database.sqlite.db.IDatabase;
 import com.minres.scviewer.database.sqlite.db.SQLiteDatabaseSelectHandler;
@@ -193,7 +192,7 @@ public class TxStream extends HierNode implements ITxStream<ITxEvent> {
 	}
 
 	@Override
-	public Boolean equals(IWaveform<? extends IWaveformEvent> other) {
+	public Boolean equals(IWaveform other) {
 		return(other instanceof TxStream && this.getId()==other.getId());
 	}
 

com.minres.scviewer.database.test/src/com/minres/scviewer/database/test/DatabaseServicesTest.java

@@ -16,6 +16,7 @@ import static org.junit.Assert.assertTrue;
 
 import java.io.File;
 import java.util.List;
+import java.util.Map;
 import java.util.Map.Entry;
 import java.util.NavigableMap;
 
@@ -33,6 +34,7 @@ import com.minres.scviewer.database.ITxStream;
 import com.minres.scviewer.database.IWaveform;
 import com.minres.scviewer.database.IWaveformDb;
 import com.minres.scviewer.database.IWaveformDbFactory;
+import com.minres.scviewer.database.vcd.VCDSignal;
 
 public class DatabaseServicesTest {
 
@@ -54,13 +56,6 @@ public class DatabaseServicesTest {
 	@Before
 	public void setUp() throws Exception {
 		waveformDb=waveformDbFactory.getDatabase();
-		// Wait for OSGi dependencies
-//		for (int i = 0; i < 10; i++) {
-//			if (waveformDb.size() == 3) // Dependencies fulfilled
-//				return;
-//			Thread.sleep(1000);
-//		}
-//		assertEquals("OSGi dependencies unfulfilled", 3, WaveformDb.getLoaders().size());
 	}
 
 	@After
@@ -73,8 +68,17 @@ public class DatabaseServicesTest {
 		assertTrue(f.exists());
 		waveformDb.load(f);
 		assertNotNull(waveformDb);
-		assertEquals(14,  waveformDb.getAllWaves().size());
+		List<IWaveform> waves= waveformDb.getAllWaves();
+		assertEquals(14,  waves.size());
 		assertEquals(2,  waveformDb.getChildNodes().size());
+		IWaveform bus_data_wave = waves.get(0);
+		VCDSignal<?> bus_data_sig = (VCDSignal<?>) bus_data_wave;
+		Entry<Long, ?> bus_data_entry = bus_data_sig.getEvents().floorEntry(1400000000L);
+		assertTrue("01111000".equals(bus_data_entry.getValue().toString()));
+		IWaveform rw_wave = waves.get(2);
+		VCDSignal<?> rw_sig = (VCDSignal<?>) rw_wave;
+		Entry<Long, ?> rw_entry = rw_sig.getEvents().floorEntry(2360000000L);
+		assertTrue("1".equals(rw_entry.getValue().toString()));
 	}
 
 	@Test
@@ -104,18 +108,18 @@ public class DatabaseServicesTest {
 		waveformDb.load(f);
 		assertNotNull(waveformDb);
 		assertEquals(1,  waveformDb.getChildNodes().size());
-		List<IWaveform<?>> waves = waveformDb.getAllWaves();
+		List<IWaveform> waves = waveformDb.getAllWaves();
 		assertEquals(3,  waves.size());
-		IWaveform<?> wave = waves.get(0);
+		IWaveform wave = waves.get(0);
 		assertTrue(wave instanceof ITxStream<?>);
 		ITxStream<?> stream = (ITxStream<?>) wave;
 		assertEquals(2,  stream.getGenerators().size());
 		NavigableMap<Long, List<ITxEvent>> eventsList = stream.getEvents();
-		assertEquals(18, eventsList.size());
+		assertEquals(27, eventsList.size());
 		Entry<Long, List<ITxEvent>> eventEntry = eventsList.firstEntry();
-		assertEquals(100000L, (long) eventEntry.getKey());
+		assertEquals(100000000L, (long) eventEntry.getKey());
 		List<ITxEvent> events = eventEntry.getValue();
-		assertEquals(2, events.size());
+		assertEquals(1, events.size());
 		ITxEvent event = events.get(0);
 		assertEquals(Type.BEGIN, event.getType());
 		ITx tx = event.getTransaction();

com.minres.scviewer.database.text/META-INF/MANIFEST.MF

@@ -5,8 +5,7 @@ Bundle-SymbolicName: com.minres.scviewer.database.text
 Bundle-Version: 1.0.1.qualifier
 Bundle-Vendor: MINRES Technologies GmbH
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Import-Package: com.minres.scviewer.database,
+Import-Package: org.osgi.framework;version="1.3.0"
- org.osgi.framework;version="1.3.0"
 Require-Bundle: com.minres.scviewer.database;bundle-version="1.0.0",
  org.codehaus.groovy;bundle-version="1.8.6",
  org.eclipse.equinox.util;bundle-version="1.0.500",

com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/TextDbLoader.groovy

@@ -59,12 +59,14 @@ public class TextDbLoader implements IWaveformDbLoader{
 	boolean load(IWaveformDb db, File file) throws Exception {
 		this.db=db
 		this.streams=[]
+		try {
 			def gzipped = isGzipped(file)
 			if(isTxfile(gzipped?new GZIPInputStream(new FileInputStream(file)):new FileInputStream(file))){
 				parseInput(gzipped?new GZIPInputStream(new FileInputStream(file)):new FileInputStream(file))
 				calculateConcurrencyIndicees()
 				return true
 			}
+		} catch(Exception e) { }
 		return false;
 	}
 

com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/TxStream.groovy

@@ -109,7 +109,7 @@ class TxStream extends HierNode implements ITxStream {
 	}
 	
 	@Override
-	public Boolean equals(IWaveform<? extends IWaveformEvent> other) {
+	public Boolean equals(IWaveform other) {
 		return(other instanceof TxStream && this.getId()==other.getId());
 	}
 

com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/IVCDDatabaseBuilder.java

@@ -47,15 +47,6 @@ public interface IVCDDatabaseBuilder {
 	 */
 	public int getNetWidth(int netId);
 
-	/**
-	 * Append transition.
-	 *
-	 * @param netId the int value
-	 * @param currentTime the current time in ps
-	 * @param decodedValues the decoded bit values
-	 */
-	public void appendTransition(int netId, long currentTime, char decodedValue);
-
 	/**
 	 * Append transition.
 	 *

com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDDbLoader.java

@@ -12,6 +12,7 @@ package com.minres.scviewer.database.vcd;
 
 import java.io.File;
 import java.io.FileInputStream;
+import java.io.FileNotFoundException;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -22,10 +23,6 @@ import java.util.Vector;
 
 import com.minres.scviewer.database.BitVector;
 import com.minres.scviewer.database.ISignal;
-import com.minres.scviewer.database.ISignalChange;
-import com.minres.scviewer.database.ISignalChangeBitVector;
-import com.minres.scviewer.database.ISignalChangeReal;
-import com.minres.scviewer.database.ISignalChangeBit;
 import com.minres.scviewer.database.IWaveform;
 import com.minres.scviewer.database.IWaveformDb;
 import com.minres.scviewer.database.IWaveformDbLoader;
@@ -49,7 +46,7 @@ public class VCDDbLoader implements IWaveformDbLoader, IVCDDatabaseBuilder {
 	private Stack<String> moduleStack;
 	
 	/** The signals. */
-	private List<IWaveform<? extends IWaveformEvent>> signals;
+	private List<IWaveform> signals;
 	
 	/** The max time. */
 	private long maxTime;
@@ -71,6 +68,7 @@ public class VCDDbLoader implements IWaveformDbLoader, IVCDDatabaseBuilder {
 	public boolean load(IWaveformDb db, File file) throws Exception {
 		this.db=db;
 		this.maxTime=0;
+		try {
 			FileInputStream fis = new FileInputStream(file);
 			byte[] buffer = new byte[dateBytes.length];
 			int read = fis.read(buffer, 0, dateBytes.length);
@@ -79,32 +77,32 @@ public class VCDDbLoader implements IWaveformDbLoader, IVCDDatabaseBuilder {
 				for (int i = 0; i < dateBytes.length; i++)
 					if (buffer[i] != dateBytes[i])
 						return false;
+		} catch(FileNotFoundException e) {
+			return false;
+		}
 
-		signals = new Vector<IWaveform<? extends IWaveformEvent>>();
+		signals = new Vector<IWaveform>();
 		moduleStack= new Stack<String>(); 
 		boolean res = new VCDFileParser(false).load(new FileInputStream(file), this);
 		moduleStack=null;
 		if(!res) throw new InputFormatException();
 		// calculate max time of database
-		for(IWaveform<? extends IWaveformEvent> waveform:signals) {
+		for(IWaveform waveform:signals) {
-			NavigableMap<Long, ? extends ISignalChange> events =((ISignal<? extends ISignalChange>)waveform).getEvents();
+			NavigableMap<Long, ?> events =((ISignal<?>)waveform).getEvents();
 			if(events.size()>0)
 				maxTime= Math.max(maxTime, events.lastKey());
 		}
 		// extend signals to hav a last value set at max time
-		for(IWaveform<? extends IWaveformEvent> waveform:signals){
+		for(IWaveform s:signals){
-			TreeMap<Long,? extends ISignalChange> events = ((VCDSignal<? extends ISignalChange>)waveform).values;
+			if(s instanceof VCDSignal<?>) {
+				TreeMap<Long,?> events = (TreeMap<Long, ?>) ((VCDSignal<?>)s).getEvents();
 				if(events.size()>0 && events.lastKey()<maxTime){
-				ISignalChange x = events.lastEntry().getValue();
+					Object val = events.lastEntry().getValue();
-				if(x instanceof ISignalChangeBit)
+					if(val instanceof BitVector) {
-					((VCDSignal<ISignalChangeBit>)waveform).values.put(maxTime, 
+						((VCDSignal<BitVector>)s).addSignalChange(maxTime, (BitVector) val);
-							new VCDSignalChangeBit(maxTime, ((ISignalChangeBit)x).getValue()));
+					} else if(val instanceof Double)
-				else if(x instanceof ISignalChangeBitVector)
+						((VCDSignal<Double>)s).addSignalChange(maxTime, (Double) val);
-						((VCDSignal<ISignalChangeBitVector>)waveform).values.put(maxTime, 
+				}
-								new VCDSignalChangeBitVector(maxTime, ((ISignalChangeBitVector)x).getValue()));
-				else if(x instanceof ISignalChangeReal)
-					((VCDSignal<ISignalChangeReal>)waveform).values.put(maxTime, 
-							new VCDSignalChangeReal(maxTime, ((ISignalChangeReal)x).getValue()));
 			}
 		}
 		return true;
@@ -122,7 +120,7 @@ public class VCDDbLoader implements IWaveformDbLoader, IVCDDatabaseBuilder {
 	 * @see com.minres.scviewer.database.ITrDb#getAllWaves()
 	 */
 	@Override
-	public List<IWaveform<? extends IWaveformEvent>> getAllWaves() {
+	public List<IWaveform> getAllWaves() {
 		return signals;
 	}
 
@@ -154,18 +152,14 @@ public class VCDDbLoader implements IWaveformDbLoader, IVCDDatabaseBuilder {
 	public Integer newNet(String name, int i, int width) {
 		String netName = moduleStack.empty()? name: moduleStack.lastElement()+"."+name;
 		int id = signals.size();
-		VCDSignal<? extends IWaveformEvent> signal;
+		assert(width>0);
-		if(width<0) {
+		if(width==0) {
-			signal = i<0 ? new VCDSignal<ISignalChangeReal>(db, id, netName, width) :
+			signals.add( i<0 ? new VCDSignal<Double>(db, id, netName) :
-				new VCDSignal<ISignalChangeReal>((VCDSignal<ISignalChangeReal>)signals.get(i), id, netName);			
+				new VCDSignal<Double>((VCDSignal<Double>)signals.get(i), id, netName));			
-		} else if(width==1){
+		} else if(width>0){
-			signal = i<0 ? new VCDSignal<ISignalChangeBit>(db, id, netName) :
+			signals.add( i<0 ? new VCDSignal<BitVector>(db, id, netName, width) :
-				new VCDSignal<ISignalChangeBit>((VCDSignal<ISignalChangeBit>)signals.get(i), id, netName);
+				new VCDSignal<BitVector>((VCDSignal<BitVector>)signals.get(i), id, netName));
-		} else {
+		}
-			signal = i<0 ? new VCDSignal<ISignalChangeBitVector>(db, id, netName, width) :
-				new VCDSignal<ISignalChangeBitVector>((VCDSignal<VCDSignalChangeBitVector>)signals.get(i), id, netName);
-		};
-		signals.add(signal);
 		return id;
 	}
 
@@ -174,7 +168,7 @@ public class VCDDbLoader implements IWaveformDbLoader, IVCDDatabaseBuilder {
 	 */
 	@Override
 	public int getNetWidth(int intValue) {
-		VCDSignal<? extends IWaveformEvent> signal = (VCDSignal<? extends IWaveformEvent>) signals.get(intValue);
+		VCDSignal<?> signal = (VCDSignal<?>) signals.get(intValue);
 		return signal.getWidth();
 	}
 
@@ -183,12 +177,10 @@ public class VCDDbLoader implements IWaveformDbLoader, IVCDDatabaseBuilder {
 	 */
 	@SuppressWarnings("unchecked")
 	@Override
-	public void appendTransition(int signalId, long currentTime, char decodedValues) {
+	public void appendTransition(int signalId, long currentTime, BitVector value) {
-		VCDSignal<? extends IWaveformEvent> signal = (VCDSignal<? extends IWaveformEvent>) signals.get(signalId);
+		VCDSignal<BitVector> signal = (VCDSignal<BitVector>) signals.get(signalId);
-		Long time = currentTime*TIME_RES;
+		Long time = currentTime* TIME_RES;
-		if(signal.getWidth()==1){
+		signal.getEvents().put(time, value);
-			((VCDSignal<ISignalChangeBit>)signal).values.put(time, new VCDSignalChangeBit(time, decodedValues));
-		}
 	}
 	
 	/* (non-Javadoc)
@@ -196,24 +188,11 @@ public class VCDDbLoader implements IWaveformDbLoader, IVCDDatabaseBuilder {
 	 */
 	@SuppressWarnings("unchecked")
 	@Override
-	public void appendTransition(int signalId, long currentTime, BitVector decodedValues) {
+	public void appendTransition(int signalId, long currentTime, double value) {
-		VCDSignal<? extends IWaveformEvent> signal = (VCDSignal<? extends IWaveformEvent>) signals.get(signalId);
+		VCDSignal<?> signal = (VCDSignal<?>) signals.get(signalId);
 		Long time = currentTime* TIME_RES;
-		if(signal.getWidth()>1){
+		if(signal.getWidth()==0){
-			((VCDSignal<VCDSignalChangeBitVector>)signal).values.put(time, new VCDSignalChangeBitVector(time, decodedValues));
+			((VCDSignal<Double>)signal).getEvents().put(time, value);
-		}
-	}
-	
-	/* (non-Javadoc)
-	 * @see com.minres.scviewer.database.vcd.ITraceBuilder#appendTransition(int, long, com.minres.scviewer.database.vcd.BitVector)
-	 */
-	@SuppressWarnings("unchecked")
-	@Override
-	public void appendTransition(int signalId, long currentTime, double decodedValue) {
-		VCDSignal<? extends IWaveformEvent> signal = (VCDSignal<? extends IWaveformEvent>) signals.get(signalId);
-		Long time = currentTime* TIME_RES;
-		if(signal.getWidth()<0){
-			((VCDSignal<ISignalChangeReal>)signal).values.put(time, new VCDSignalChangeReal(time, decodedValue));
 		}
 	}
 	

com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDFileParser.java

@@ -13,6 +13,7 @@ package com.minres.scviewer.database.vcd;
 import java.io.*;
 import java.util.*;
 
+import com.minres.scviewer.database.BitValue;
 import com.minres.scviewer.database.BitVector;
 
 class VCDFileParser {
@@ -65,7 +66,7 @@ class VCDFileParser {
 		nextToken(); // size
 		int width = Integer.parseInt(tokenizer.sval);
 		if("real".equals(type))
-			width*=-1;
+			width=0;
 		nextToken();
 		String id = tokenizer.sval;
 		nextToken();
@@ -183,7 +184,7 @@ class VCDFileParser {
 			}
 
 			int netWidth = traceBuilder.getNetWidth(net);
-			if(netWidth<0) {
+			if(netWidth==0) {
 				if("nan".equals(value))
 					traceBuilder.appendTransition(net, currentTime, Double.NaN);
 				else
@@ -192,38 +193,39 @@ class VCDFileParser {
 				BitVector decodedValues = new BitVector(netWidth);
 				if (value.equals("z") && netWidth > 1) {
 					for (int i = 0; i < netWidth; i++)
-						decodedValues.setValue(i, BitVector.VALUE_Z);
+						decodedValues.setValue(i, BitValue.Z);
 				} else if (value.equals("x") && netWidth > 1) {
 					for (int i = 0; i < netWidth; i++)
-						decodedValues.setValue(i, BitVector.VALUE_X);
+						decodedValues.setValue(i, BitValue.X);
 				} else {
 					int stringIndex = 0;
-					for (int convertedIndex = netWidth - value.length(); convertedIndex < netWidth; convertedIndex++) {
+					for (int convertedIndex = netWidth -1; convertedIndex >=0; convertedIndex--) {
+						if(convertedIndex<value.length()) {
 							switch (value.charAt(stringIndex++)) {
 							case 'z':
-							decodedValues.setValue(convertedIndex, BitVector.VALUE_Z);
+								decodedValues.setValue(convertedIndex, BitValue.Z);
 								break;
 
 							case '1':
-							decodedValues.setValue(convertedIndex, BitVector.VALUE_1);
+								decodedValues.setValue(convertedIndex, BitValue.ONE);
 								break;
 
 							case '0':
-							decodedValues.setValue(convertedIndex, BitVector.VALUE_0);
+								decodedValues.setValue(convertedIndex, BitValue.ZERO);
 								break;
 
 							case 'x':
-							decodedValues.setValue(convertedIndex, BitVector.VALUE_X);
+								decodedValues.setValue(convertedIndex, BitValue.X);
 								break;
 
 							default:
-							decodedValues.setValue(convertedIndex, BitVector.VALUE_X);
+								decodedValues.setValue(convertedIndex, BitValue.X);
+							}
+						} else {
+							decodedValues.setValue(convertedIndex, BitValue.ZERO);
 						}
 					}
 				}
-				if(netWidth==1)
-					traceBuilder.appendTransition(net, currentTime, decodedValues.getValue()[0]);
-				else
 				traceBuilder.appendTransition(net, currentTime, decodedValues);
 			}
 		}

com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDSignal.java

@@ -16,12 +16,11 @@ import java.util.TreeMap;
 
 import com.minres.scviewer.database.HierNode;
 import com.minres.scviewer.database.ISignal;
-import com.minres.scviewer.database.ISignalChange;
 import com.minres.scviewer.database.IWaveform;
 import com.minres.scviewer.database.IWaveformDb;
 import com.minres.scviewer.database.IWaveformEvent;
 
-public class VCDSignal<T extends ISignalChange> extends HierNode implements ISignal<T> {
+public class VCDSignal<T> extends HierNode implements ISignal<T> {
 
 	private long id;
 
@@ -31,9 +30,11 @@ public class VCDSignal<T extends ISignalChange> extends HierNode implements ISig
 	
 	private final int width;
 
+	private final T dummy = null;
+	
 	private IWaveformDb db;
 
-	TreeMap<Long, T> values;
+	private TreeMap<Long, T> values;
 	
 	public VCDSignal(IWaveformDb db, String name) {
 		this(db, 0, name, 1);
@@ -53,7 +54,7 @@ public class VCDSignal<T extends ISignalChange> extends HierNode implements ISig
 	}
 
 	@SuppressWarnings("unchecked")
-	public VCDSignal(IWaveform<? extends ISignalChange> other, int id, String name) {
+	public VCDSignal(ISignal<T> other, int id, String name) {
 		super(name);
 		fullName=name;
 		this.id=id;
@@ -91,8 +92,8 @@ public class VCDSignal<T extends ISignalChange> extends HierNode implements ISig
 		return db;
 	}
 
-	public void addSignalChange(T change){
+	public void addSignalChange(Long time, T value){
-		values.put(change.getTime(), change);
+		values.put(time, value);
 	}
 	
 	@Override
@@ -101,12 +102,12 @@ public class VCDSignal<T extends ISignalChange> extends HierNode implements ISig
 	}
 
 	@Override
-	public T getWaveformEventsAtTime(Long time) {
+	public T getWaveformValueAtTime(Long time) {
 		return values.get(time);
 	}
 
     @Override
-    public T getWaveformEventsBeforeTime(Long time) {
+    public T getWaveformValueBeforeTime(Long time) {
     	Entry<Long, T> e = values.floorEntry(time);
     	if(e==null)
     		return null;
@@ -115,10 +116,15 @@ public class VCDSignal<T extends ISignalChange> extends HierNode implements ISig
     }
 
 	@Override
-	public Boolean equals(IWaveform<? extends IWaveformEvent> other) {
+	public Boolean equals(IWaveform other) {
 		return(other instanceof VCDSignal<?> && this.getId()==other.getId());
 	}
 
+	@Override
+	public Class<?> getType() {
+		return dummy.getClass();
+	}
+
 
 
 }

com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDSignalChangeBit.java

@@ -1,37 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2015 MINRES Technologies GmbH and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- *     MINRES Technologies GmbH - initial API and implementation
- *******************************************************************************/
-package com.minres.scviewer.database.vcd;
-
-import com.minres.scviewer.database.ISignalChangeBit;
-import com.minres.scviewer.database.SignalChange;
-
-public class VCDSignalChangeBit extends SignalChange implements ISignalChangeBit, Cloneable {
-
-	private char value;
-
-	public VCDSignalChangeBit(Long time, char value) {
-		super(time);
-		this.value=value;
-	}
-
-	public char getValue() {
-		return value;
-	}
-
-	public void setValue(char value) {
-		this.value = value;
-	}
-	
-	@Override
-	public String toString() {
-		return value+"@"+getTime();
-	}
-}

com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDSignalChangeBitVector.java

@@ -1,43 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2015 MINRES Technologies GmbH and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- *     MINRES Technologies GmbH - initial API and implementation
- *******************************************************************************/
-package com.minres.scviewer.database.vcd;
-
-import com.minres.scviewer.database.BitVector;
-import com.minres.scviewer.database.ISignalChangeBitVector;
-import com.minres.scviewer.database.SignalChange;
-
-public class VCDSignalChangeBitVector extends SignalChange implements ISignalChangeBitVector, Cloneable  {
-
-	private BitVector value;
-	
-	public VCDSignalChangeBitVector(Long time) {
-		super(time);
-	}
-
-	public VCDSignalChangeBitVector(Long time, BitVector decodedValues) {
-		super(time);
-		this.value=decodedValues;
-	}
-
-	public BitVector getValue() {
-		return value;
-	}
-	
-	public void setValue(BitVector value) {
-		this.value = value;
-	}
-
-	@Override
-	public String toString() {
-		return value.toHexString()+"@"+getTime();
-	}
-
-}

com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDSignalChangeReal.java

@@ -1,37 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2015 MINRES Technologies GmbH and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- *     MINRES Technologies GmbH - initial API and implementation
- *******************************************************************************/
-package com.minres.scviewer.database.vcd;
-
-import com.minres.scviewer.database.ISignalChangeReal;
-import com.minres.scviewer.database.SignalChange;
-
-public class VCDSignalChangeReal extends SignalChange implements ISignalChangeReal, Cloneable {
-
-	private double value;
-
-	public VCDSignalChangeReal(Long time, double value) {
-		super(time);
-		this.value=value;
-	}
-
-	public double getValue() {
-		return value;
-	}
-
-	public void setValue(double value) {
-		this.value = value;
-	}
-	
-	@Override
-	public String toString() {
-		return value+"@"+getTime();
-	}
-}

com.minres.scviewer.database/src/com/minres/scviewer/database/BitValue.java

@@ -0,0 +1,68 @@
+package com.minres.scviewer.database;
+public enum BitValue {
+    ZERO,
+    ONE,
+    X,
+    Z;
+
+    private static final BitValue[] ORDINAL_TABLE = BitValue.values();
+
+    public static BitValue fromChar(char c) {
+        switch (c) {
+            case '0':
+                return ZERO;
+            case '1':
+                return ONE;
+            case 'x':
+            case 'X':
+                return X;
+            case 'z':
+            case 'Z':
+                return Z;
+            default:
+                throw new NumberFormatException("unknown digit " + c);
+        }
+    }
+
+    public char toChar() {
+        switch (this) {
+            case ZERO:
+                return '0';
+            case ONE:
+                return '1';
+            case X:
+                return 'x';
+            case Z:
+                return 'z';
+        }
+
+        return ' '; // Unreachable?
+    }
+
+    public static BitValue fromInt(int i) {
+        if (i == 0) {
+            return ZERO;
+        } else {
+            return ONE;
+        }
+    }
+
+    public int toInt() {
+        return (this == ONE) ? 1 : 0;
+    }
+
+    public static BitValue fromOrdinal(int ord) {
+        return ORDINAL_TABLE[ord];
+    }
+
+    public int compare(BitValue other) {
+        if (this == ONE && other == ZERO) {
+            return 1;
+        } else if (this == ZERO && other == ONE) {
+            return -1;
+        } else {
+            // Either these are equal, or there is an X and Z, which match everything.
+            return 0;
+        }
+    }
+}

com.minres.scviewer.database/src/com/minres/scviewer/database/BitVector.java

@@ -12,31 +12,53 @@ package com.minres.scviewer.database;
 
 public class BitVector {
 
-	public static final char VALUE_X = 'X';
-	public static final char VALUE_Z = 'Z';
-	public static final char VALUE_1 = '1';
-	public static final char VALUE_0 = '0';
-
 	private final int width;
 	
-	private char[] value;
+	private int[] packedValues;
 	
 	public BitVector(int netWidth) {
 		this.width=netWidth;
-		value = new char[netWidth];
+		packedValues = new int[(netWidth+15)/16];
-		for(int i=0; i<netWidth; i++) value[i]='0';
+		for(int i=0; i<packedValues.length; i++) packedValues[i]=0;
 	}
 
-	public void setValue(int i, char value) {
+	public void setValue(int i, BitValue value) {
-		this.value[i]=value;
+		int bitIndex = i*2;
+		int wordOffset = bitIndex >> 5;
+		int bitOffset = bitIndex & 31;
+		packedValues[wordOffset] &= ~(3 << bitOffset);
+		packedValues[wordOffset] |= value.ordinal() << bitOffset;
 	}
 
 	public char[] getValue() {
-		return value;
+        int bitOffset = 0;
+        int wordOffset = 0;
+        char[] res = new char[width];
+        // Copy values out of packed array
+        for (int i = 0; i < width; i++) {
+            int currentWord = (packedValues[wordOffset] >> bitOffset)&3;
+        	res[width-i-1]=BitValue.fromInt(currentWord).toChar();
+            bitOffset += 2;
+            if (bitOffset == 32) {
+                wordOffset++;
+                bitOffset = 0;
+            }
+        }
+		return res;
 	}
 
 	public void setValue(char[] value) {
-		this.value = value;
+		int bitIndex = width;
+		int wordOffset = bitIndex >> 4;
+		int bitOffset = (bitIndex * 2) % 32;
+		for (int i = Math.min(value.length, width) - 1; i >= 0; i--) {
+			packedValues[wordOffset] |= BitValue.fromChar(value[i]).ordinal() << bitOffset;
+			bitOffset += 2;
+			if (bitOffset == 32) {
+				wordOffset++;
+				bitOffset = 0;
+			}
+		}
 	}
 
 	public int getWidth() {
@@ -44,40 +66,61 @@ public class BitVector {
 	}
 
 	public String toString(){
-		return new String(value);
+		return new String(getValue());
 	}
 	
 	public String toHexString(){
 		int resWidth=(width-1)/4+1;
+		char[] value=getValue();
 		char[] res = new char[resWidth];
 		for(int i=resWidth-1; i>=0; i--){
 			int digit=0;
 			for(int j=3; j>=0; j--){
-				if(value[4*i+j]==VALUE_X ||value[4*i+j]==VALUE_Z ){
+				BitValue val = BitValue.fromChar(value[4*i+j]);
-					res[i]=VALUE_X;
+				switch(val) {
-				}
+				case X:
-				if(value[4*i+j]==VALUE_1)
+				case Z:
+					res[i]=val.toChar();
+					continue;
+				case ONE:
 					digit+=1<<(3-j);
-				res[i]=Character.forDigit(digit, 16); //((digit < 10) ? '0' + digit : 'a' + digit -10)
+					break;
+				default:
+					break;
 				}
 			}
+			res[i]=Character.forDigit(digit, 16); //((digit < 10) ? '0' + digit : 'a' + digit -10)
+		}
 		return new String(res);		
 	}
 	
 	public long toUnsignedValue() {
 		long res = 0;
-		for(char c:value) {
+        int bitOffset = width * 2;
+        int wordOffset = bitOffset >> 5;
+        bitOffset &= 31;
+        int currentWord = packedValues[wordOffset] >> bitOffset;
+        // Copy values out of packed array
+        for (int i = 0; i < width; i++) {
 			res<<=1;
-			switch (c) {
+			switch (currentWord & 3) {
-			case VALUE_1:
+			case 1:
 				res++;
 				break;
-			case VALUE_X:
+			case 2:
-			case VALUE_Z:
+			case 3:
 				return 0;
 			default:
 				break;
 			}
+            bitOffset += 2;
+            if (bitOffset == 32) {
+                wordOffset++;
+                currentWord = packedValues[wordOffset];
+                bitOffset = 0;
+            } else {
+                currentWord >>= 2;
+            }
         }
         return res;
 	}
@@ -85,25 +128,38 @@ public class BitVector {
 	public long toSignedValue() {
 		Boolean negative=null;
 		long res = 0;
-		for(char c:value) {
+        int bitOffset = width * 2;
+        int wordOffset = bitOffset >> 5;
+        bitOffset &= 31;
+        int currentWord = packedValues[wordOffset] >> bitOffset;
+        // Copy values out of packed array
+        for (int i = 0; i < width; i++) {
 			if(negative == null) {
-				switch (c) {
+				switch (currentWord & 3) {
-				case VALUE_1: negative=true; break;
+				case 1: negative=true; break;
-				case VALUE_0: negative=false; break;
+				case 0: negative=false; break;
-				case VALUE_X:
+				case 2:
-				case VALUE_Z: return 0;
+				case 3: return 0;
 				default:
 				}				
 			} else {
 				res<<=1;
-				switch (c) {
+				switch (currentWord & 3) {
-				case VALUE_1: if(!negative)	res++; break;
+				case 1: if(!negative)	res++; break;
-				case VALUE_0: if(negative)	res++; break;
+				case 0: if(negative)	res++; break;
-				case VALUE_X:
+				case 2:
-				case VALUE_Z: return 0;
+				case 3: return 0;
 				default:
 				}
 			}
+            bitOffset += 2;
+            if (bitOffset == 32) {
+                wordOffset++;
+                currentWord = packedValues[wordOffset];
+                bitOffset = 0;
+            } else {
+                currentWord >>= 2;
+            }
         }
 		return negative?-1*(res+1):res;
 	}

com.minres.scviewer.database/src/com/minres/scviewer/database/ISignal.java

@@ -13,12 +13,14 @@ package com.minres.scviewer.database;
 import java.util.NavigableMap;
 
 
-public interface ISignal<T extends ISignalChange> extends IWaveform<T>{
+public interface ISignal<T> extends IWaveform{
 
 	public NavigableMap<Long, T> getEvents();
 
-	public T getWaveformEventsAtTime(Long time);
+	public T getWaveformValueAtTime(Long time);
 
-	public T getWaveformEventsBeforeTime(Long time);
+	public T getWaveformValueBeforeTime(Long time);
+	
+	public Class<?> getType();
 }
 

com.minres.scviewer.database/src/com/minres/scviewer/database/ISignalChange.java

@@ -1,15 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2015 MINRES Technologies GmbH and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- *     MINRES Technologies GmbH - initial API and implementation
- *******************************************************************************/
-package com.minres.scviewer.database;
-
-public interface ISignalChange extends IWaveformEvent {
-
-}

com.minres.scviewer.database/src/com/minres/scviewer/database/ISignalChangeBit.java

@@ -1,17 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2015 MINRES Technologies GmbH and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- *     MINRES Technologies GmbH - initial API and implementation
- *******************************************************************************/
-package com.minres.scviewer.database;
-
-public interface ISignalChangeBit extends ISignalChange{
-
-	public char getValue();
-	
-}

com.minres.scviewer.database/src/com/minres/scviewer/database/ISignalChangeBitVector.java

@@ -1,17 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2015 MINRES Technologies GmbH and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- *     MINRES Technologies GmbH - initial API and implementation
- *******************************************************************************/
-package com.minres.scviewer.database;
-
-public interface ISignalChangeBitVector extends ISignalChange {
-	
-	public BitVector getValue();
-
-}

com.minres.scviewer.database/src/com/minres/scviewer/database/ISignalChangeReal.java

@@ -1,17 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2015 MINRES Technologies GmbH and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- *     MINRES Technologies GmbH - initial API and implementation
- *******************************************************************************/
-package com.minres.scviewer.database;
-
-public interface ISignalChangeReal extends ISignalChange{
-
-	public double getValue();
-	
-}

com.minres.scviewer.database/src/com/minres/scviewer/database/ITxStream.java

@@ -14,7 +14,7 @@ import java.util.Collection;
 import java.util.List;
 import java.util.NavigableMap;
 
-public interface  ITxStream<T extends ITxEvent> extends IWaveform<T> {
+public interface  ITxStream<T extends ITxEvent> extends IWaveform {
 
 	public List<ITxGenerator> getGenerators();
 

com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveform.java

@@ -11,7 +11,7 @@
 package com.minres.scviewer.database;
 
 
-public interface IWaveform<T extends IWaveformEvent> extends IHierNode {
+public interface IWaveform extends IHierNode {
 
 	public Long getId();
 
@@ -19,6 +19,6 @@ public interface IWaveform<T extends IWaveformEvent> extends IHierNode {
 
 	public IWaveformDb getDb();
 	
-	public Boolean equals(IWaveform<? extends IWaveformEvent> other);
+	public Boolean equals(IWaveform other);
 
 }

com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveformDb.java

@@ -18,9 +18,9 @@ public interface IWaveformDb extends IHierNode {
 
 	public Long getMaxTime();
 	
-	public IWaveform<? extends IWaveformEvent> getStreamByName(String name);
+	public IWaveform getStreamByName(String name);
 	
-	public List<IWaveform<?>> getAllWaves();
+	public List<IWaveform> getAllWaves();
 	
 	public List<RelationType> getAllRelationTypes();
 	

com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveformDbLoader.java

@@ -20,7 +20,7 @@ public interface IWaveformDbLoader {
 	
 	public Long getMaxTime();
 	
-	public List<IWaveform<? extends IWaveformEvent>> getAllWaves() ;
+	public List<IWaveform> getAllWaves() ;
 	
 	public Collection<RelationType> getAllRelationTypes() ;
 	

com.minres.scviewer.database/src/com/minres/scviewer/database/SignalChange.java

@@ -1,46 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2015 MINRES Technologies GmbH and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- *     MINRES Technologies GmbH - initial API and implementation
- *******************************************************************************/
-package com.minres.scviewer.database;
-
-public class SignalChange implements IWaveformEvent {
-	
-	Long time;
-	
-	
-	public SignalChange() {
-		time=0L;
-	}
-
-	public SignalChange(Long time) {
-		super();
-		this.time = time;
-	}
-
-	@Override
-	public int compareTo(IWaveformEvent o) {
-		return time.compareTo(o.getTime());
-	}
-
-	@Override
-	public Long getTime() {
-		return time;
-	}
-
-	public void setTime(Long time) {
-		this.time = time;
-	}
-
-	@Override
-	public IWaveformEvent duplicate() throws CloneNotSupportedException {
-		return (IWaveformEvent) this.clone();
-	}
-
-}

com.minres.scviewer.database/src/com/minres/scviewer/database/internal/WaveformDb.java

@@ -41,7 +41,7 @@ public class WaveformDb extends HierNode implements IWaveformDb {
 
 	private List<RelationType> relationTypes;
 	
-	private Map<String, IWaveform<?>> waveforms;
+	private Map<String, IWaveform> waveforms;
 
 	private Long maxTime;
 	
@@ -61,7 +61,7 @@ public class WaveformDb extends HierNode implements IWaveformDb {
 
 	public WaveformDb() {
 		super();
-		waveforms = new HashMap<String, IWaveform<?>>();
+		waveforms = new HashMap<String, IWaveform>();
 		relationTypes=new ArrayList<>();
 		maxTime=0L;
 	}
@@ -72,20 +72,20 @@ public class WaveformDb extends HierNode implements IWaveformDb {
 	}
 
 	@Override
-	public IWaveform<? extends IWaveformEvent> getStreamByName(String name) {
+	public IWaveform getStreamByName(String name) {
 		return waveforms.get(name);
 	}
 
 	@Override
-	public List<IWaveform<?>> getAllWaves() {
+	public List<IWaveform> getAllWaves() {
-		return new ArrayList<IWaveform<?>>(waveforms.values());
+		return new ArrayList<IWaveform>(waveforms.values());
 	}
 
 	@Override
 	public boolean load(File inp) throws Exception {
 		for(IWaveformDbLoader loader:loaders){
 			if(loader.load(this, inp)){
-				for(IWaveform<?> w:loader.getAllWaves()){
+				for(IWaveform w:loader.getAllWaves()){
 					waveforms.put(w.getFullName(),w);
 				}
 				if(loader.getMaxTime()>maxTime){
@@ -125,8 +125,8 @@ public class WaveformDb extends HierNode implements IWaveformDb {
 
 	private void buildHierarchyNodes() throws InputFormatException{
 		childNodes= new ArrayList<IHierNode>();
-		for(IWaveform<?> stream:getAllWaves()){
+		for(IWaveform stream:getAllWaves()){
-			updateMaxTime(stream);
+			//updateMaxTime(stream);
 			String[] hier = stream.getName().split("\\.");
 			IHierNode node = this;
 			List<String> path=new LinkedList<String>();
@@ -169,16 +169,6 @@ public class WaveformDb extends HierNode implements IWaveformDb {
 		}
 	}
 
-	private void updateMaxTime(IWaveform<?> waveform) {
-		Long last=0L;
-		if(waveform instanceof ITxStream<?> && ((ITxStream<?>)waveform).getEvents().lastEntry()!=null)
-			last=((ITxStream<?>)waveform).getEvents().lastEntry().getKey();
-		else if(waveform instanceof ISignal<?> && ((ISignal<?>)waveform).getEvents().lastEntry()!=null)
-			last=((ISignal<?>)waveform).getEvents().lastEntry().getKey();
-		if(last>maxTime)
-			maxTime=last;
-	}
-	
 	private static String join(Collection<?> col, String delim) {
 	    StringBuilder sb = new StringBuilder();
 	    Iterator<?> iter = col.iterator();