/**
 * Copyright 2007-2016, Kaazing Corporation. All rights reserved.
 *
 * 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 org.apache.mina.core.buffer;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;



/**
 * A simplistic {@link IoBufferAllocator} which simply allocates a new
 * buffer every time.
 *
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
public class SimpleBufferAllocator implements IoBufferAllocator {

    public IoBuffer allocate(int capacity, boolean direct) {
        return wrap(allocateNioBuffer(capacity, direct));
    }
    
    public ByteBuffer allocateNioBuffer(int capacity, boolean direct) {
        ByteBuffer nioBuffer;
        if (direct) {
            nioBuffer = ByteBuffer.allocateDirect(capacity);
        } else {
            nioBuffer = ByteBuffer.allocate(capacity);
        }
        return nioBuffer;
    }

    public IoBuffer wrap(ByteBuffer nioBuffer) {
        return new SimpleBuffer(nioBuffer);
    }

    public void dispose() {
        // Do nothing
    }

    private class SimpleBuffer extends AbstractIoBuffer {
        private ByteBuffer buf;

        protected SimpleBuffer(ByteBuffer buf) {
            super(SimpleBufferAllocator.this, buf.capacity());
            this.buf = buf;
            buf.order(ByteOrder.BIG_ENDIAN);
        }

        protected SimpleBuffer(SimpleBuffer parent, ByteBuffer buf) {
            super(parent);
            this.buf = buf;
        }

        @Override
        public ByteBuffer buf() {
            return buf;
        }
        
        @Override
        protected void buf(ByteBuffer buf) {
            this.buf = buf;
        }

        @Override
        protected IoBuffer duplicate0() {
            return new SimpleBuffer(this, this.buf.duplicate());
        }

        @Override
        protected IoBuffer slice0() {
            return new SimpleBuffer(this, this.buf.slice());
        }

        @Override
        protected IoBuffer asReadOnlyBuffer0() {
            return new SimpleBuffer(this, this.buf.asReadOnlyBuffer());
        }

        @Override
        public byte[] array() {
            return buf.array();
        }

        @Override
        public int arrayOffset() {
            return buf.arrayOffset();
        }

        @Override
        public boolean hasArray() {
            return buf.hasArray();
        }

        @Override
        public void free() {
            // Do nothing
        }
    }
}
