1 /*

     2  * reserved comment block

     3  * DO NOT REMOVE OR ALTER!

     4  */

     5 /*

     6  * Copyright 1999-2004 The Apache Software Foundation.

     7  *

     8  * Licensed under the Apache License, Version 2.0 (the "License");

     9  * you may not use this file except in compliance with the License.

    10  * You may obtain a copy of the License at

    11  *

    12  *     http://www.apache.org/licenses/LICENSE-2.0

    13  *

    14  * Unless required by applicable law or agreed to in writing, software

    15  * distributed under the License is distributed on an "AS IS" BASIS,

    16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    17  * See the License for the specific language governing permissions and

    18  * limitations under the License.

    19  */

    20 

    21 package com.sun.org.apache.regexp.internal;

    22 

    23 /**

    24  * Encapsulates char[] as CharacterIterator

    25  *

    26  * @author <a href="mailto:ales.novak@netbeans.com">Ales Novak</a>

    27  */

    28 public final class CharacterArrayCharacterIterator implements CharacterIterator

    29 {

    30     /** encapsulated */

    31     private final char[] src;

    32     /** offset in the char array */

    33     private final int off;

    34     /** used portion of the array */

    35     private final int len;

    36 

    37     /** @param src - encapsulated String */

    38     public CharacterArrayCharacterIterator(char[] src, int off, int len)

    39     {

    40         this.src = src;

    41         this.off = off;

    42         this.len = len;

    43     }

    44 

    45     /** @return a substring */

    46     public String substring(int beginIndex, int endIndex)

    47     {

    48         if (endIndex > len) {

    49             throw new IndexOutOfBoundsException("endIndex=" + endIndex

    50                                                 + "; sequence size=" + len);

    51         }

    52         if (beginIndex < 0 || beginIndex > endIndex) {

    53             throw new IndexOutOfBoundsException("beginIndex=" + beginIndex

    54                                                 + "; endIndex=" + endIndex);

    55         }

    56         return new String(src, off + beginIndex, endIndex - beginIndex);

    57     }

    58 

    59     /** @return a substring */

    60     public String substring(int beginIndex)

    61     {

    62         return substring(beginIndex, len);

    63     }

    64 

    65     /** @return a character at the specified position. */

    66     public char charAt(int pos)

    67     {

    68         return src[off + pos];

    69     }

    70 

    71     /** @return <tt>true</tt> iff if the specified index is after the end of the character stream */

    72     public boolean isEnd(int pos)

    73     {

    74         return (pos >= len);

    75     }

    76 }