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package com.sun.tools.xmlpp;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.XMLFilterImpl;
/**
* Surpresses ignorable whitespaces.
*
* @author
* Kohsuke Kawaguchi (kk@kohsuke.org)
*/
class IgnorableWhitespaceFilter extends XMLFilterImpl {
private final StringBuffer buf = new StringBuffer();
IgnorableWhitespaceFilter( XMLReader parent ) {
setParent(parent);
}
IgnorableWhitespaceFilter() {
}
/**
* Characters event might be fired in two or more consequtive events,
* so we can't just decide if something is ignorable from one event.
*
* Buffer, and process it later.
*/
public void characters(char[] ch, int start, int length)
throws SAXException {
buf.append(ch,start,length);
}
public void ignorableWhitespace(char[] ch, int start, int length) {
}
public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
flushCharacters();
super.startElement(uri, localName, qName, atts);
}
public void endElement(String uri, String localName, String qName) throws SAXException {
flushCharacters();
super.endElement(uri, localName, qName);
}
public void processingInstruction(String target, String data) throws SAXException {
flushCharacters();
super.processingInstruction(target, data);
}
public void skippedEntity(String name) throws SAXException {
flushCharacters();
super.skippedEntity(name);
}
private void flushCharacters() throws SAXException {
if(!isIgnorable(buf))
super.characters(buf.toString().toCharArray(),0,buf.length());
buf.setLength(0);
}
private static boolean isIgnorable(StringBuffer buf) {
for (int i = buf.length()-1; i >= 0; i--)
if (!isWhitespace(buf.charAt(i)))
return false;
return true;
}
private static boolean isWhitespace( char ch ) {
return ch==' ' || ch=='\t' || ch=='\r' || ch=='\n';
}
}