/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.template.utility;
import freemarker.template.TemplateTransformModel;
import java.io.*;
import java.util.Map;
/**
* <p>Transformer that supports FreeMarker legacy behavior: all newlines appearing
* within the transformed area will be transformed into the platform's default
* newline. Unlike the old behavior, however, newlines generated by the data
* model are also converted. Legacy behavior was to leave newlines in the
* data model unaltered.</p>
*
* <p>Usage:<br />
* From java:</p>
* <pre>
* SimpleHash root = new SimpleHash();
*
* root.put( "normalizeNewlines", new freemarker.template.utility.NormalizeNewlines() );
*
* ...
* </pre>
*
* <p>From your FreeMarker template:</p>
* <pre>
* <transform normalizeNewlines>
* <html>
* <head>
* ...
* <p>This template has all newlines normalized to the current platform's
* default.</p>
* ...
* </body>
* </html>
* </transform>
* </pre>
*
*
* @version $Id: NormalizeNewlines.java,v 1.29 2003/04/11 20:57:32 revusky Exp $
*/
public class NormalizeNewlines implements TemplateTransformModel {
public Writer getWriter(final Writer out,
final Map args)
{
final StringBuffer buf = new StringBuffer();
return new Writer() {
public void write(char cbuf[], int off, int len) {
buf.append(cbuf, off, len);
}
public void flush() throws IOException {
out.flush();
}
public void close() throws IOException {
StringReader sr = new StringReader(buf.toString());
StringWriter sw = new StringWriter();
transform(sr, sw);
out.write(sw.toString());
}
};
}
/**
* Performs newline normalization on FreeMarker output.
*
* @param in the input to be transformed
* @param out the destination of the transformation
*/
public void transform(Reader in, Writer out) throws IOException
{
BufferedReader br = (in instanceof BufferedReader)
? (BufferedReader) in
: new BufferedReader(in);
PrintWriter pw = (out instanceof PrintWriter)
? (PrintWriter) out
: new PrintWriter(out);
String line = br.readLine();
if (line != null) {
if ( line.length() > 0 ) {
pw.println(line);
}
}
while ((line = br.readLine()) != null) {
pw.println(line);
}
}
}
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