Fixed Tx properties

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

@@ -0,0 +1,79 @@
+package com.minres.scviewer.database.leveldb;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.iq80.leveldb.Options;
+import org.iq80.leveldb.Range;
+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 {
+	private final Options options;
+	private final File databaseDir;
+	private DbImpl db;
+
+	StringDBWrapper(Options options, File databaseDir) throws IOException {
+		this.options = options.verifyChecksums(true).createIfMissing(false).errorIfExists(false);
+		this.databaseDir = databaseDir;
+		this.db = new DbImpl(options, databaseDir);
+	}
+
+	public String get(String key) {
+		byte[] slice = db.get(LevelDBLoader.toByteArray(key));
+		if (slice == null) {
+			return null;
+		}
+		return new String(slice, UTF_8);
+	}
+
+	public String get(String key, Snapshot snapshot) {
+		byte[] slice = db.get(LevelDBLoader.toByteArray(key), new ReadOptions().snapshot(snapshot));
+		if (slice == null) {
+			return null;
+		}
+		return new String(slice, UTF_8);
+	}
+
+	public void put(String key, String value) {
+		db.put(LevelDBLoader.toByteArray(key), LevelDBLoader.toByteArray(value));
+	}
+
+	public void delete(String key) {
+		db.delete(LevelDBLoader.toByteArray(key));
+	}
+
+	public SeekingIterator<String, String> iterator() {
+		return new StringDbIterator(db.iterator());
+	}
+
+	public Snapshot getSnapshot() {
+		return db.getSnapshot();
+	}
+
+	public void close() {
+		db.close();
+	}
+
+	public long size(String start, String limit) {
+		return db.getApproximateSizes(new Range(LevelDBLoader.toByteArray(start), LevelDBLoader.toByteArray(limit)));
+	}
+
+	public long getMaxNextLevelOverlappingBytes() {
+		return db.getMaxNextLevelOverlappingBytes();
+	}
+
+	public void reopen() throws IOException {
+		reopen(options);
+	}
+
+	public void reopen(Options options) throws IOException {
+		db.close();
+		db = new DbImpl(options.verifyChecksums(true).createIfMissing(false).errorIfExists(false), databaseDir);
+	}
+}