/*
* Copyright DataStax, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.datastax.oss.driver.internal.core.util;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.nio.ByteBuffer;
public class RoutingKey {
Assembles multiple routing key components into a single buffer. /** Assembles multiple routing key components into a single buffer. */
@NonNull
public static ByteBuffer compose(@NonNull ByteBuffer... components) {
if (components.length == 1) return components[0];
int totalLength = 0;
for (ByteBuffer bb : components) totalLength += 2 + bb.remaining() + 1;
ByteBuffer out = ByteBuffer.allocate(totalLength);
for (ByteBuffer buffer : components) {
ByteBuffer bb = buffer.duplicate();
putShortLength(out, bb.remaining());
out.put(bb);
out.put((byte) 0);
}
out.flip();
return out;
}
private static void putShortLength(ByteBuffer bb, int length) {
bb.put((byte) ((length >> 8) & 0xFF));
bb.put((byte) (length & 0xFF));
}
}