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Liferay Portal Template FreeMarker
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package freemarker.template.utility;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Map;
import freemarker.template.TemplateTransformModel;
/**
* 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.
*
* Usage:
* From java:
*
* SimpleHash root = new SimpleHash();
*
* root.put( "normalizeNewlines", new freemarker.template.utility.NormalizeNewlines() );
*
* ...
*
*
* From your FreeMarker template:
*
* <transform normalizeNewlines>
* <html>
* <head>
* ...
* <p>This template has all newlines normalized to the current platform's
* default.</p>
* ...
* </body>
* </html>
* </transform>
*
*/
public class NormalizeNewlines implements TemplateTransformModel {
@Override
public Writer getWriter(final Writer out,
final Map args) {
final StringBuilder buf = new StringBuilder();
return new Writer() {
@Override
public void write(char cbuf[], int off, int len) {
buf.append(cbuf, off, len);
}
@Override
public void flush() throws IOException {
out.flush();
}
@Override
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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