de.intarsys.tools.xml.HTMLEncodeLineBreaks Maven / Gradle / Ivy
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/*
* Copyright (c) 2007, intarsys consulting GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - 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.
*
* - Neither the name of intarsys nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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.
*/
package de.intarsys.tools.xml;
import java.io.FilterReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
/**
* A reader that encodes literal line breaks to html tags.
*
* "\r" are ignored, "\n" are encoded.
*
*/
public class HTMLEncodeLineBreaks extends FilterReader {
/**
* A local buffer for reading escaped character sequences
*/
private StringReader buffer = null;
public HTMLEncodeLineBreaks(Reader in) {
super(in);
}
/*
* (non-Javadoc)
*
* @see java.io.Reader#read()
*/
@Override
public int read() throws IOException {
int c;
if (buffer != null) {
c = buffer.read();
if (c == -1) {
buffer = null;
} else {
return c;
}
}
c = super.read();
if (c == '\n') {
buffer = new StringReader("
");
} else if (c == '\r') {
return read();
} else {
return c;
}
return buffer.read();
}
/*
* (non-Javadoc)
*
* @see java.io.Reader#read(char[], int, int)
*/
@Override
public int read(char[] cbuf, int off, int len) throws IOException {
int result = -1;
for (int i = off; i < (off + len);) {
int c = read();
if (c == -1) {
return result;
}
cbuf[i++] = (char) c;
result = i - off;
}
return len;
}
}