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comparison: src/net/fortuna/ical4j/data/FoldingWriter.java
src/net/fortuna/ical4j/data/FoldingWriter.java
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| 1 /** | |
| 2 * Copyright (c) 2012, Ben Fortuna | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions | |
| 7 * are met: | |
| 8 * | |
| 9 * o Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * | |
| 12 * o Redistributions in binary form must reproduce the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer in the | |
| 14 * documentation and/or other materials provided with the distribution. | |
| 15 * | |
| 16 * o Neither the name of Ben Fortuna nor the names of any other contributors | |
| 17 * may be used to endorse or promote products derived from this software | |
| 18 * without specific prior written permission. | |
| 19 * | |
| 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
| 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 31 */ | |
| 32 package net.fortuna.ical4j.data; | |
| 33 | |
| 34 import java.io.FilterWriter; | |
| 35 import java.io.IOException; | |
| 36 import java.io.Writer; | |
| 37 | |
| 38 import org.apache.commons.logging.Log; | |
| 39 import org.apache.commons.logging.LogFactory; | |
| 40 | |
| 41 /** | |
| 42 * <pre> | |
| 43 * $Id$ [Apr 6, 2004] | |
| 44 * </pre> | |
| 45 * | |
| 46 * A writer that performs iCalendar folding as it writes. | |
| 47 * @author Ben Fortuna | |
| 48 */ | |
| 49 public class FoldingWriter extends FilterWriter { | |
| 50 | |
| 51 /** | |
| 52 * reduced to 73 to be consistent with Apple iCal.. | |
| 53 */ | |
| 54 public static final int REDUCED_FOLD_LENGTH = 73; | |
| 55 | |
| 56 /** | |
| 57 * Lines of text SHOULD NOT be longer than 75 octets, excluding the line break. | |
| 58 */ | |
| 59 public static final int MAX_FOLD_LENGTH = 75; | |
| 60 | |
| 61 private static final char[] FOLD_PATTERN = { '\r', '\n', ' ' }; | |
| 62 | |
| 63 private final Log log = LogFactory.getLog(FoldingWriter.class); | |
| 64 | |
| 65 private int lineLength; | |
| 66 | |
| 67 private final int foldLength; | |
| 68 | |
| 69 /** | |
| 70 * @param writer a writer to write output to | |
| 71 * @param foldLength the maximum line length | |
| 72 */ | |
| 73 public FoldingWriter(final Writer writer, final int foldLength) { | |
| 74 super(writer); | |
| 75 this.foldLength = Math.min(foldLength, MAX_FOLD_LENGTH); | |
| 76 } | |
| 77 | |
| 78 /** | |
| 79 * @param writer a writer to write output to | |
| 80 */ | |
| 81 public FoldingWriter(final Writer writer) { | |
| 82 this(writer, REDUCED_FOLD_LENGTH); | |
| 83 } | |
| 84 | |
| 85 /** | |
| 86 * {@inheritDoc} | |
| 87 */ | |
| 88 public final void write(final int c) throws IOException { | |
| 89 | |
| 90 /* | |
| 91 * super.write(c); if (c == '\n') { lineLength = 0; } else { lineLength += 1; } if (lineLength >= FOLD_LENGTH) { | |
| 92 * super.write(FOLD_PATTERN); } | |
| 93 */ | |
| 94 write(new char[] { (char) c }, 0, 1); | |
| 95 } | |
| 96 | |
| 97 /** | |
| 98 * {@inheritDoc} | |
| 99 */ | |
| 100 public final void write(final char[] buffer, final int offset, | |
| 101 final int length) throws IOException { | |
| 102 final int maxIndex = offset + length - 1; | |
| 103 for (int i = offset; i <= maxIndex; i++) { | |
| 104 | |
| 105 // debugging.. | |
| 106 if (log.isTraceEnabled()) { | |
| 107 log.trace("char [" + buffer[i] + "], line length [" | |
| 108 + lineLength + "]"); | |
| 109 } | |
| 110 | |
| 111 // check for fold first so we don't unnecessarily fold after | |
| 112 // no more data.. | |
| 113 if (lineLength >= foldLength) { | |
| 114 super.write(FOLD_PATTERN, 0, FOLD_PATTERN.length); | |
| 115 | |
| 116 // re-initialise to 1 to account for the space in fold pattern.. | |
| 117 lineLength = 1; | |
| 118 } | |
| 119 | |
| 120 super.write(buffer[i]); | |
| 121 | |
| 122 if (buffer[i] == '\r' || buffer[i] == '\n') { | |
| 123 lineLength = 0; | |
| 124 } | |
| 125 else { | |
| 126 lineLength += 1; | |
| 127 } | |
| 128 } | |
| 129 } | |
| 130 | |
| 131 /** | |
| 132 * {@inheritDoc} | |
| 133 */ | |
| 134 public final void write(final String str, final int off, final int len) | |
| 135 throws IOException { | |
| 136 write(str.toCharArray(), off, len); | |
| 137 } | |
| 138 | |
| 139 /* | |
| 140 * (non-Javadoc) | |
| 141 * @see java.io.FilterWriter#write(java.lang.String, int, int) public void write(String arg0, int arg1, int arg2) | |
| 142 * throws IOException { super.write(arg0, arg1, arg2); if (arg0.indexOf('\n') >= 0) { lineLength = 0; } else { | |
| 143 * lineLength += 1; } fold(); } | |
| 144 */ | |
| 145 | |
| 146 /* | |
| 147 * (non-Javadoc) | |
| 148 * @see java.io.Writer#write(java.lang.String) public void write(String arg0) throws IOException { | |
| 149 * /* if (lineLength + | |
| 150 * arg0.length() >= FOLD_LENGTH) { super.write(arg0.substring(0,FOLD_LENGTH-lineLength-1)); | |
| 151 * super.write(FOLD_PATTERN); super.write(arg0.substring(FOLD_LENGTH-lineLength)); } else { super.write(arg0); } if | |
| 152 * (arg0.indexOf('\n') >= 0) { lineLength = 0; } else { lineLength += 1; } fold(); char[] chars = | |
| 153 * arg0.toCharArray(); for (int i=0; i <chars.length; i++) { write(chars[i]); } } | |
| 154 */ | |
| 155 } |
