001: /*
002: * Copyright (c) 2003 The Visigoth Software Society. All rights
003: * reserved.
004: *
005: * Redistribution and use in source and binary forms, with or without
006: * modification, are permitted provided that the following conditions
007: * are met:
008: *
009: * 1. Redistributions of source code must retain the above copyright
010: * notice, this list of conditions and the following disclaimer.
011: *
012: * 2. Redistributions in binary form must reproduce the above copyright
013: * notice, this list of conditions and the following disclaimer in
014: * the documentation and/or other materials provided with the
015: * distribution.
016: *
017: * 3. The end-user documentation included with the redistribution, if
018: * any, must include the following acknowledgement:
019: * "This product includes software developed by the
020: * Visigoth Software Society (http://www.visigoths.org/)."
021: * Alternately, this acknowledgement may appear in the software itself,
022: * if and wherever such third-party acknowledgements normally appear.
023: *
024: * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
025: * project contributors may be used to endorse or promote products derived
026: * from this software without prior written permission. For written
027: * permission, please contact visigoths@visigoths.org.
028: *
029: * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030: * nor may "FreeMarker" or "Visigoth" appear in their names
031: * without prior written permission of the Visigoth Software Society.
032: *
033: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036: * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044: * SUCH DAMAGE.
045: * ====================================================================
046: *
047: * This software consists of voluntary contributions made by many
048: * individuals on behalf of the Visigoth Software Society. For more
049: * information on the Visigoth Software Society, please see
050: * http://www.visigoths.org/
051: */
052:
053: package freemarker.template.utility;
054:
055: import freemarker.template.TemplateTransformModel;
056: import java.io.*;
057: import java.util.Map;
058:
059: /**
060: * <p>Transformer that supports FreeMarker legacy behavior: all newlines appearing
061: * within the transformed area will be transformed into the platform's default
062: * newline. Unlike the old behavior, however, newlines generated by the data
063: * model are also converted. Legacy behavior was to leave newlines in the
064: * data model unaltered.</p>
065: *
066: * <p>Usage:<br />
067: * From java:</p>
068: * <pre>
069: * SimpleHash root = new SimpleHash();
070: *
071: * root.put( "normalizeNewlines", new freemarker.template.utility.NormalizeNewlines() );
072: *
073: * ...
074: * </pre>
075: *
076: * <p>From your FreeMarker template:</p>
077: * <pre>
078: * <transform normalizeNewlines>
079: * <html>
080: * <head>
081: * ...
082: * <p>This template has all newlines normalized to the current platform's
083: * default.</p>
084: * ...
085: * </body>
086: * </html>
087: * </transform>
088: * </pre>
089: *
090: *
091: * @version $Id: NormalizeNewlines.java,v 1.29 2003/04/11 20:57:32 revusky Exp $
092: */
093: public class NormalizeNewlines implements TemplateTransformModel {
094:
095: public Writer getWriter(final Writer out, final Map args) {
096: final StringBuffer buf = new StringBuffer();
097: return new Writer() {
098: public void write(char cbuf[], int off, int len) {
099: buf.append(cbuf, off, len);
100: }
101:
102: public void flush() throws IOException {
103: out.flush();
104: }
105:
106: public void close() throws IOException {
107: StringReader sr = new StringReader(buf.toString());
108: StringWriter sw = new StringWriter();
109: transform(sr, sw);
110: out.write(sw.toString());
111: }
112: };
113: }
114:
115: /**
116: * Performs newline normalization on FreeMarker output.
117: *
118: * @param in the input to be transformed
119: * @param out the destination of the transformation
120: */
121: public void transform(Reader in, Writer out) throws IOException {
122: BufferedReader br = (in instanceof BufferedReader) ? (BufferedReader) in
123: : new BufferedReader(in);
124: PrintWriter pw = (out instanceof PrintWriter) ? (PrintWriter) out
125: : new PrintWriter(out);
126: String line = br.readLine();
127: if (line != null) {
128: if (line.length() > 0) {
129: pw.println(line);
130: }
131: }
132: while ((line = br.readLine()) != null) {
133: pw.println(line);
134: }
135: }
136: }
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