SCViewer/plugins/com.minres.scviewer.databas.../src/com/minres/scviewer/database/leveldb/LevelDBLoader.java

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package com.minres.scviewer.database.leveldb;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.File;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map.Entry;
import org.iq80.leveldb.Options;
import org.iq80.leveldb.impl.SeekingIterator;
import org.json.JSONObject;
import com.minres.scviewer.database.IWaveform;
import com.minres.scviewer.database.IWaveformDb;
import com.minres.scviewer.database.IWaveformDbLoader;
import com.minres.scviewer.database.RelationType;
public class LevelDBLoader implements IWaveformDbLoader {
static byte[] toByteArray(String value) {
return value.getBytes(UTF_8);
}
private TxDBWrapper levelDb;
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private IWaveformDb db;
private Long maxTime=null;
private List<RelationType> usedRelationsList = new ArrayList<>();
@Override
public boolean load(IWaveformDb db, File inp) throws Exception {
try {
this.db=db;
levelDb = new TxDBWrapper(new Options(), inp);
JSONObject configVal = new JSONObject(levelDb.get("__config"));
if(!configVal.isEmpty())
levelDb.setTimeResolution(configVal.getLong("resolution"));
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} catch(Exception e) {
return false;
}
return true;
}
@Override
public Long getMaxTime() {
if(maxTime==null) {
SeekingIterator<String, String> it = levelDb.iterator();
it.seek("st~");
Entry<String, String> val = null;
while(it.hasNext()) {
Entry<String, String> v = it.next();
if(!v.getKey().startsWith("st~")) continue;
val=v;
}
if(val==null)
maxTime = 0L;
else {
String[] token = val.getKey().split("~");
maxTime = Long.parseLong(token[2], 16)*levelDb.getTimeResolution();
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}
}
return maxTime;
}
@Override
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public Collection<IWaveform> getAllWaves() {
List<IWaveform> streams=new ArrayList<IWaveform>();
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SeekingIterator<String, String> it = levelDb.iterator();
it.seek("s~");
while(it.hasNext()) {
Entry<String, String> val = it.next();
if(!val.getKey().startsWith("s~")) break;
TxStream stream = new TxStream(levelDb, db, new JSONObject(val.getValue()));
stream.setRelationTypeList(usedRelationsList);
streams.add(stream);
}
return streams;
}
@Override
public Collection<RelationType> getAllRelationTypes() {
// return Collections.emptyList();
return usedRelationsList;
}
}