@Test public void testLimitedView() throws IOException { File file = folder.newFile(); FileChannel chan = new RandomAccessFile(file, "rw").getChannel(); BinaryIndexTableWriter writer = BinaryIndexTableWriter.create(BinaryFormat.create(), chan, 3); writer.writeEntry(12, new int[] {0}); writer.writeEntry(17, new int[] {1, 3}); writer.writeEntry(19, new int[] {4, 5}); MappedByteBuffer buffer = chan.map(FileChannel.MapMode.READ_ONLY, 0, chan.size()); BinaryIndexTable tbl = BinaryIndexTable.fromBuffer(3, buffer); tbl = tbl.createLimitedView(2); assertThat(tbl.getKeys(), hasSize(2)); assertThat(tbl.getKeys(), contains(12L, 17L)); assertThat(tbl.getEntry(12), contains(0)); assertThat(tbl.getEntry(17), contains(1)); assertThat(tbl.getEntry(19), nullValue()); assertThat(tbl.getEntry(-1), nullValue()); BinaryIndexTable serializedTbl = SerializationUtils.clone(tbl); assertThat(serializedTbl.getKeys(), hasSize(2)); assertThat(serializedTbl.getKeys(), contains(12L, 17L)); assertThat(serializedTbl.getEntry(12), contains(0)); assertThat(serializedTbl.getEntry(17), contains(1)); assertThat(serializedTbl.getEntry(19), nullValue()); assertThat(serializedTbl.getEntry(-1), nullValue()); }
@Test public void testSingleEntry() throws IOException { File file = folder.newFile(); FileChannel chan = new RandomAccessFile(file, "rw").getChannel(); BinaryIndexTableWriter w = BinaryIndexTableWriter.create(BinaryFormat.create(), chan, 1); w.writeEntry(42, new int[] {0}); MappedByteBuffer buf = chan.map(FileChannel.MapMode.READ_ONLY, 0, chan.size()); BinaryIndexTable tbl = BinaryIndexTable.fromBuffer(1, buf); assertThat(tbl.getKeys(), contains(42L)); assertThat(tbl.getEntry(42), contains(0)); assertThat(tbl.getEntry(43), nullValue()); }
@Test public void testEmpty() { BinaryIndexTable tbl = BinaryIndexTable.fromBuffer(0, ByteBuffer.allocate(0)); assertThat(tbl.getKeys(), hasSize(0)); assertThat(tbl.getEntry(42), nullValue()); }