@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());
}