001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 *
019 */
020package org.apache.mina.core.buffer;
021
022import java.nio.ByteBuffer;
023import java.nio.ByteOrder;
024
025/**
026 * A simplistic {@link IoBufferAllocator} which simply allocates a new
027 * buffer every time.
028 *
029 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
030 */
031public class SimpleBufferAllocator implements IoBufferAllocator {
032
033    public IoBuffer allocate(int capacity, boolean direct) {
034        return wrap(allocateNioBuffer(capacity, direct));
035    }
036
037    public ByteBuffer allocateNioBuffer(int capacity, boolean direct) {
038        ByteBuffer nioBuffer;
039        if (direct) {
040            nioBuffer = ByteBuffer.allocateDirect(capacity);
041        } else {
042            nioBuffer = ByteBuffer.allocate(capacity);
043        }
044        return nioBuffer;
045    }
046
047    public IoBuffer wrap(ByteBuffer nioBuffer) {
048        return new SimpleBuffer(nioBuffer);
049    }
050
051    public void dispose() {
052        // Do nothing
053    }
054
055    private class SimpleBuffer extends AbstractIoBuffer {
056        private ByteBuffer buf;
057
058        protected SimpleBuffer(ByteBuffer buf) {
059            super(SimpleBufferAllocator.this, buf.capacity());
060            this.buf = buf;
061            buf.order(ByteOrder.BIG_ENDIAN);
062        }
063
064        protected SimpleBuffer(SimpleBuffer parent, ByteBuffer buf) {
065            super(parent);
066            this.buf = buf;
067        }
068
069        @Override
070        public ByteBuffer buf() {
071            return buf;
072        }
073
074        @Override
075        protected void buf(ByteBuffer buf) {
076            this.buf = buf;
077        }
078
079        @Override
080        protected IoBuffer duplicate0() {
081            return new SimpleBuffer(this, this.buf.duplicate());
082        }
083
084        @Override
085        protected IoBuffer slice0() {
086            return new SimpleBuffer(this, this.buf.slice());
087        }
088
089        @Override
090        protected IoBuffer asReadOnlyBuffer0() {
091            return new SimpleBuffer(this, this.buf.asReadOnlyBuffer());
092        }
093
094        @Override
095        public byte[] array() {
096            return buf.array();
097        }
098
099        @Override
100        public int arrayOffset() {
101            return buf.arrayOffset();
102        }
103
104        @Override
105        public boolean hasArray() {
106            return buf.hasArray();
107        }
108
109        @Override
110        public void free() {
111            // Do nothing
112        }
113    }
114}