// This software is released into the Public Domain. See copying.txt for details.
package org.openstreetmap.osmosis.xml.common;
import org.xml.sax.Attributes;
/**
* Provides a no-op implementation of an element processor. This implementation
* is provided to allow nested elements to be ignored if they are not required.
*
* @author Brett Henderson
*/
public class DummyElementProcessor extends BaseElementProcessor {
private int nestedElementCount;
/**
* Creates a new instance.
*
* @param parentProcessor
* The parent of this element processor.
*/
public DummyElementProcessor(BaseElementProcessor parentProcessor) {
super(parentProcessor, false);
}
/**
* This implementation does not do any processing.
*
* @param attributes
* The attributes of the new element.
*/
public void begin(Attributes attributes) {
// Nothing to do because we're not processing this element.
}
/**
* This implementation returns itself and increments an internal counter.
* The corresponding getParent method decrements the counter and when it
* reaches zero returns the true parent of this instance.
*
* @param uri
* The element uri.
* @param localName
* The element localName.
* @param qName
* The element qName.
* @return This instance.
*/
@Override
public ElementProcessor getChild(String uri, String localName, String qName) {
nestedElementCount++;
return this;
}
/**
* This implementation decrements an internal counter, if the counter
* reaches zero the true parent is returned, else this instance is returned.
*
* @return The element processor for the parent of the current element.
*/
@Override
public ElementProcessor getParent() {
if (nestedElementCount > 0) {
nestedElementCount--;
return this;
} else {
return super.getParent();
}
}
/**
* This implementation does not do any processing.
*/
public void end() {
// Nothing to do because we're not processing this element.
}
}