/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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 org.apache.cassandra.io.util; import java.io.IOException; import java.nio.ByteBuffer; /** * Input stream around a single ByteBuffer. */ public class DataInputBuffer extends RebufferingInputStream { private static ByteBuffer slice(byte[] buffer, int offset, int length) { ByteBuffer buf = ByteBuffer.wrap(buffer); if (offset > 0 || length < buf.capacity()) { buf.position(offset); buf.limit(offset + length); buf = buf.slice(); } return buf; } /** * @param buffer * @param duplicate Whether or not to duplicate the buffer to ensure thread safety */ public DataInputBuffer(ByteBuffer buffer, boolean duplicate) { super(duplicate ? buffer.duplicate() : buffer); } public DataInputBuffer(byte[] buffer, int offset, int length) { super(slice(buffer, offset, length)); } public DataInputBuffer(byte[] buffer) { super(ByteBuffer.wrap(buffer)); } @Override protected void reBuffer() throws IOException { //nope, we don't rebuffer, we are done! } @Override public int available() throws IOException { return buffer.remaining(); } }