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docx4j is a library which helps you to work with the Office Open
XML file format as used in docx
documents, pptx presentations, and xlsx spreadsheets.
package com.topologi.diffx.xml.esc;
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import java.io.IOException;
import java.io.Writer;
/**
* A utility class for escaping XML data using the UTF-8 encoding.
*
* @author Christophe Lauret
*
* @version 7 March 2005
*/
public final class XMLEscapeWriterUTF8 extends XMLEscapeWriterBase implements XMLEscapeWriter {
/**
* The encoding used for this instance.
*/
private static final String ENCODING = "utf-8";
/**
* Creates a new XML escape writer using the utf-8 encoding.
*
* @param w The writer to wrap.
*
* @throws NullPointerException if the writer is null.
*/
public XMLEscapeWriterUTF8(Writer w) throws NullPointerException {
super(w, ENCODING);
}
/**
* Replaces '<', '&', '"' and '\'' as well an any character that is not part of
* the standard unicode range.
*
*
* Char ::= #x9 | #xA | #xD |
* [#x20-#xD7FF] |
* [#xE000-#xFFFD] |
* [#x10000-#x10FFFF]
*
*
* @see XMLEscapeWriter#writeAttValue(char[], int, int)
*/
public void writeAttValue(char[] ch, int off, int len) throws IOException {
// process the rest
char c = ' ';
for (int i = off; i < (off+len); i++) {
c = ch[i];
if (c == '<') w.write("<");
else if (c == '>') w.write(">");
else if (c == '&') w.write("&");
else if (c == '"') w.write(""");
else if (c == '\'') w.write("'");
// use character references for anything above 0xff
else if (c > 255) w.write("&#"+(int)c+";");
// trash control 0 chars: [0x00 - 0x20] except tab, carriage return and line feed
else if (c == '\n' || c == '\r' || c == '\t') w.write(c);
else if (c < 32) doNothing();
// trash control 1 chars: [0x80 - 0x9f], del: 0x7f
else if (c >= 127 && c < 160) doNothing();
else { w.write(c); }
}
}
/**
* Replace characters which are invalid in element values,
* by the corresponding entity in a given String.
*
* these characters are:
*
* - '&' by the ampersand entity "&"
* - '<' by the entity "<"
*
*
* Note: this function assumes that there are no entities in
* the given String. If there are existing entities, then the
* ampersand character will be escaped by the ampersand entity.
*
* @see XMLEscapeWriter#writeText(char)
*/
public void writeText(char c) throws IOException {
// process the rest
if (c == '<') w.write("<");
else if (c == '>') w.write(">");
else if (c == '&') w.write("&");
else if (c == '"') w.write(""");
else if (c == '\'') w.write("'");
// use character references for anything above 0xff
else if (c > 255) w.write("&#"+(int)c+";");
// trash control 0 chars: [0x00 - 0x20] except tab, carriage return and line feed
else if (c == '\n' || c == '\r' || c == '\t') w.write(c);
else if (c < 32) doNothing();
// trash control 1 chars: [0x80 - 0x9f], del: 0x7f
else if (c >= 127 && c < 160) doNothing();
else w.write(c);
}
/**
* Does nothing.
*
*
This method exists so that we can explicitly say that we should do nothing
* in certain conditions.
*/
private static void doNothing() {
}
}