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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.core.buffer;
    21
    22  import java.nio.ByteBuffer;
    23  import java.nio.ByteOrder;
    24
    25  /**
    26   * A simplistic {@link IoBufferAllocator} which simply allocates a new
    27   * buffer every time.
    28   *
    29   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    30   */
    31  public class SimpleBufferAllocator implements IoBufferAllocator {
    32
    33      public IoBuffer allocate(int capacity, boolean direct) {
    34          return wrap(allocateNioBuffer(capacity, direct));
    35      }
    36
    37      public ByteBuffer allocateNioBuffer(int capacity, boolean direct) {
    38          ByteBuffer nioBuffer;
    39          if (direct) {
    40              nioBuffer = ByteBuffer.allocateDirect(capacity);
    41          } else {
    42              nioBuffer = ByteBuffer.allocate(capacity);
    43          }
    44          return nioBuffer;
    45      }
    46
    47      public IoBuffer wrap(ByteBuffer nioBuffer) {
    48          return new SimpleBuffer(nioBuffer);
    49      }
    50
    51      public void dispose() {
    52          // Do nothing
    53      }
    54
    55      private class SimpleBuffer extends AbstractIoBuffer {
    56          private ByteBuffer buf;
    57
    58          protected SimpleBuffer(ByteBuffer buf) {
    59              super(SimpleBufferAllocator.this, buf.capacity());
    60              this.buf = buf;
    61              buf.order(ByteOrder.BIG_ENDIAN);
    62          }
    63
    64          protected SimpleBuffer(SimpleBuffer parent, ByteBuffer buf) {
    65              super(parent);
    66              this.buf = buf;
    67          }
    68
    69          @Override
    70          public ByteBuffer buf() {
    71              return buf;
    72          }
    73
    74          @Override
    75          protected void buf(ByteBuffer buf) {
    76              this.buf = buf;
    77          }
    78
    79          @Override
    80          protected IoBuffer duplicate0() {
    81              return new SimpleBuffer(this, this.buf.duplicate());
    82          }
    83
    84          @Override
    85          protected IoBuffer slice0() {
    86              return new SimpleBuffer(this, this.buf.slice());
    87          }
    88
    89          @Override
    90          protected IoBuffer asReadOnlyBuffer0() {
    91              return new SimpleBuffer(this, this.buf.asReadOnlyBuffer());
    92          }
    93
    94          @Override
    95          public byte[] array() {
    96              return buf.array();
    97          }
    98
    99          @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 }