1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.flatfile;
18
19 import java.io.IOException;
20
21 import org.apache.commons.flatfile.util.RepeatingInputStream;
22
23 /**
24 * Generic entity support stuff.
25 * @version $Revision: 1301242 $ $Date: 2012-03-15 17:14:40 -0500 (Thu, 15 Mar 2012) $
26 */
27 public abstract class EntitySupport implements Entity {
28
29 /** Serialization version */
30 private static final long serialVersionUID = 1067918863342682612L;
31
32 /**
33 * {@inheritDoc}
34 */
35 public void fill(byte b) throws IOException {
36 readFrom(RepeatingInputStream.of(b));
37 }
38
39 /**
40 * {@inheritDoc}
41 */
42 public EntitySupport clone() {
43 try {
44 return (EntitySupport) super.clone();
45 } catch (CloneNotSupportedException e) {
46 throw new RuntimeException(e);
47 }
48 }
49
50 /**
51 * {@inheritDoc}
52 * Naive implementation which can and should be overridden by subclasses.
53 */
54 public byte[] getValue(int offset, int length) {
55 if (offset + length > length()) {
56 throw new IndexOutOfBoundsException();
57 }
58 final byte[] value = getValue();
59 final byte[] result = new byte[length];
60 System.arraycopy(value, offset, result, 0, length);
61 return result;
62 }
63
64 /**
65 * {@inheritDoc}
66 */
67 public void setValue(byte[] b, int offset, int length) {
68 if (offset + length > b.length) {
69 throw new IndexOutOfBoundsException();
70 }
71 final byte[] subset = new byte[length];
72 System.arraycopy(b, offset, subset, 0, length);
73 setValue(subset);
74 }
75
76 }