| /* |
| * 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; |
| |
| /** |
| * <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> |
| */ |
| 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); |
| } |
| } |
| } |