org.rocksdb.NativeComparatorWrapper Maven / Gradle / Ivy
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
package org.rocksdb;
import java.nio.ByteBuffer;
/**
* A simple abstraction to allow a Java class to wrap a custom comparator
* implemented in C++.
*
* The native comparator must directly extend rocksdb::Comparator.
*/
public abstract class NativeComparatorWrapper
extends AbstractComparator {
@Override
final ComparatorType getComparatorType() {
return ComparatorType.JAVA_NATIVE_COMPARATOR_WRAPPER;
}
@Override
public final String name() {
throw new IllegalStateException("This should not be called. " +
"Implementation is in Native code");
}
@Override
public final int compare(final ByteBuffer s1, final ByteBuffer s2) {
throw new IllegalStateException("This should not be called. " +
"Implementation is in Native code");
}
@Override
public final void findShortestSeparator(final ByteBuffer start, final ByteBuffer limit) {
throw new IllegalStateException("This should not be called. " +
"Implementation is in Native code");
}
@Override
public final void findShortSuccessor(final ByteBuffer key) {
throw new IllegalStateException("This should not be called. " +
"Implementation is in Native code");
}
/**
* We override {@link RocksCallbackObject#disposeInternal()}
* as disposing of a native rocksdb::Comparator extension requires
* a slightly different approach as it is not really a RocksCallbackObject
*/
@Override
protected void disposeInternal() {
disposeInternal(nativeHandle_);
}
private native void disposeInternal(final long handle);
}