01 /*
02 *
03 * Licensed to the Apache Software Foundation (ASF) under one
04 * or more contributor license agreements. See the NOTICE file
05 * distributed with this work for additional information
06 * regarding copyright ownership. The ASF licenses this file
07 * to you under the Apache License, Version 2.0 (the
08 * "License"); you may not use this file except in compliance
09 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 *
20 */
21 package org.apache.qpid.framing;
22
23 import org.apache.mina.common.ByteBuffer;
24
25 /**
26 * A data block represents something that has a size in bytes and the ability to write itself to a byte
27 * buffer (similar to a byte array).
28 */
29 public abstract class AMQDataBlock implements EncodableAMQDataBlock
30 {
31 /**
32 * Get the size of buffer needed to store the byte representation of this
33 * frame.
34 * @return unsigned integer
35 */
36 public abstract long getSize();
37
38 /**
39 * Writes the datablock to the specified buffer.
40 * @param buffer
41 */
42 public abstract void writePayload(ByteBuffer buffer);
43
44 public ByteBuffer toByteBuffer()
45 {
46 final ByteBuffer buffer = ByteBuffer.allocate((int)getSize());
47
48 writePayload(buffer);
49 buffer.flip();
50 return buffer;
51 }
52
53 public java.nio.ByteBuffer toNioByteBuffer()
54 {
55 final java.nio.ByteBuffer buffer = java.nio.ByteBuffer.allocate((int) getSize());
56
57 ByteBuffer buf = ByteBuffer.wrap(buffer);
58 writePayload(buf);
59 buffer.flip();
60 return buffer;
61 }
62
63 }
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