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
18 package org.apache.regexp;
19
20 /**
21 * Encapsulates char[] as CharacterIterator
22 *
23 * @author <a href="mailto:ales.novak@netbeans.com">Ales Novak</a>
24 * @version CVS $Id: CharacterArrayCharacterIterator.java 518156 2007-03-14 14:31:26Z vgritsenko $
25 */
26 public final class CharacterArrayCharacterIterator implements CharacterIterator
27 {
28 /** encapsulated */
29 private final char[] src;
30 /** offset in the char array */
31 private final int off;
32 /** used portion of the array */
33 private final int len;
34
35 /** @param src - encapsulated String */
36 public CharacterArrayCharacterIterator(char[] src, int off, int len)
37 {
38 this.src = src;
39 this.off = off;
40 this.len = len;
41 }
42
43 /** @return a substring */
44 public String substring(int beginIndex, int endIndex)
45 {
46 if (endIndex > len) {
47 throw new IndexOutOfBoundsException("endIndex=" + endIndex
48 + "; sequence size=" + len);
49 }
50 if (beginIndex < 0 || beginIndex > endIndex) {
51 throw new IndexOutOfBoundsException("beginIndex=" + beginIndex
52 + "; endIndex=" + endIndex);
53 }
54 return new String(src, off + beginIndex, endIndex - beginIndex);
55 }
56
57 /** @return a substring */
58 public String substring(int beginIndex)
59 {
60 return substring(beginIndex, len);
61 }
62
63 /** @return a character at the specified position. */
64 public char charAt(int pos)
65 {
66 return src[off + pos];
67 }
68
69 /** @return <tt>true</tt> iff if the specified index is after the end of the character stream */
70 public boolean isEnd(int pos)
71 {
72 return (pos >= len);
73 }
74 }
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