/*
    *  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.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
         }
     }
 }