| 1 | /* |
| 2 | * Copyright (c) 2009 The JOMC Project |
| 3 | * Copyright (c) 2005 Christian Schulte <cs@jomc.org> |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * |
| 10 | * o Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * |
| 13 | * o Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in |
| 15 | * the documentation and/or other materials provided with the |
| 16 | * distribution. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE JOMC PROJECT AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 20 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 21 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE JOMC PROJECT OR |
| 22 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 23 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 24 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 25 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 26 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 27 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 28 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 | * |
| 30 | * $Id: TrailingWhitespaceEditor.java 891 2009-11-02 03:40:00Z schulte2005 $ |
| 31 | * |
| 32 | */ |
| 33 | package org.jomc.util; |
| 34 | |
| 35 | /** |
| 36 | * {@code LineEditor} removing trailing whitespace. |
| 37 | * |
| 38 | * @author <a href="mailto:cs@jomc.org">Christian Schulte</a> |
| 39 | * @version $Id: TrailingWhitespaceEditor.java 891 2009-11-02 03:40:00Z schulte2005 $ |
| 40 | * |
| 41 | * @see #edit(java.lang.String) |
| 42 | */ |
| 43 | public final class TrailingWhitespaceEditor extends LineEditor |
| 44 | { |
| 45 | |
| 46 | /** Creates a new {@code TrailingWhitespaceEditor} instance. */ |
| 47 | public TrailingWhitespaceEditor() |
| 48 | { |
| 49 | super(); |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Creates a new {@code TrailingWhitespaceEditor} instance taking a string to use for separating lines. |
| 54 | * |
| 55 | * @param lineSeparator String to use for separating lines. |
| 56 | */ |
| 57 | public TrailingWhitespaceEditor( final String lineSeparator ) |
| 58 | { |
| 59 | super( lineSeparator ); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Creates a new {@code TrailingWhitespaceEditor} instance taking an editor to chain. |
| 64 | * |
| 65 | * @param editor The editor to chain. |
| 66 | */ |
| 67 | public TrailingWhitespaceEditor( final LineEditor editor ) |
| 68 | { |
| 69 | super( editor ); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Creates a new {@code TrailingWhitespaceEditor} instance taking an editor to chain and a string to use for separating lines. |
| 74 | * |
| 75 | * @param editor The editor to chain. |
| 76 | * @param lineSeparator String to use for separating lines. |
| 77 | */ |
| 78 | public TrailingWhitespaceEditor( final LineEditor editor, final String lineSeparator ) |
| 79 | { |
| 80 | super( editor, lineSeparator ); |
| 81 | } |
| 82 | |
| 83 | @Override |
| 84 | protected String editLine( final String line ) |
| 85 | { |
| 86 | String replacement = line; |
| 87 | |
| 88 | if ( line != null ) |
| 89 | { |
| 90 | StringBuilder whitespace = null; |
| 91 | boolean sawWhitespace = false; |
| 92 | final StringBuilder buf = new StringBuilder( line.length() ); |
| 93 | final char[] chars = line.toCharArray(); |
| 94 | |
| 95 | for ( int i = 0; i < chars.length; i++ ) |
| 96 | { |
| 97 | if ( Character.isWhitespace( chars[i] ) ) |
| 98 | { |
| 99 | if ( whitespace == null ) |
| 100 | { |
| 101 | whitespace = new StringBuilder(); |
| 102 | } |
| 103 | |
| 104 | whitespace.append( chars[i] ); |
| 105 | sawWhitespace = true; |
| 106 | } |
| 107 | else |
| 108 | { |
| 109 | if ( sawWhitespace ) |
| 110 | { |
| 111 | buf.append( whitespace ); |
| 112 | sawWhitespace = false; |
| 113 | whitespace = null; |
| 114 | } |
| 115 | buf.append( chars[i] ); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | replacement = buf.toString(); |
| 120 | } |
| 121 | |
| 122 | return replacement; |
| 123 | } |
| 124 | |
| 125 | } |