/*
* 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 org.apache.cocoon.pipeline.component.sax;
import org.apache.cocoon.pipeline.caching.CacheKey;
import org.apache.cocoon.pipeline.caching.SimpleCacheKey;
import org.apache.cocoon.pipeline.component.CachingPipelineComponent;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
public class CleaningTransformer extends AbstractTransformer implements CachingPipelineComponent {
private static final String EMPTY_NS = "";
private char[] characters = new char[8192];
private int position;
@Override
public void startPrefixMapping(String prefix, String uri) {
// no prefix
}
@Override
public void endPrefixMapping(String prefix) throws SAXException {
// no prefix
}
@Override
public void comment(char[] ch, int start, int length) throws SAXException {
// no comment
}
@Override
public void startElement(String uri, String localName, String name, Attributes atts) throws SAXException {
this.maybeWriteCharacters();
super.startElement(EMPTY_NS, localName, localName, atts);
}
@Override
public void endElement(String uri, String localName, String name) throws SAXException {
this.maybeWriteCharacters();
super.endElement(EMPTY_NS, localName, localName);
}
@Override
public void characters(char[] c, int start, int len) throws SAXException {
int remaining = this.characters.length - this.position;
if (len > remaining) {
// not enough capacity remaining, allocate a new array and copy the
// current contents
int newCapacity = this.characters.length + len + 1000;
char[] nextCharacters = new char[newCapacity];
System.arraycopy(this.characters, 0, nextCharacters, 0, this.position);
this.characters = nextCharacters;
}
// simply append at the current position (the check above ensures
// there's enough space)
System.arraycopy(c, start, this.characters, this.position, len);
// update current position
this.position += len;
}
private void maybeWriteCharacters() throws SAXException {
if (this.position == 0) {
// no characters pending
return;
}
for (int i = 0; i < this.position; i++) {
char eachChar = this.characters[i];
if (!Character.isWhitespace(eachChar) || eachChar == '\u00A0') {
super.characters(this.characters, 0, this.position);
break;
}
}
this.position = 0;
}
public CacheKey constructCacheKey() {
return new SimpleCacheKey();
}
}