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/*
* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
*
* This software is open source.
* See the bottom of this file for the licence.
*/
package org.dom4j.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.dom4j.Attribute;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.QName;
import org.dom4j.tree.BackedList;
import org.dom4j.tree.DefaultElement;
/**
* IndexedElement is an implementation of {@link Element}which
* maintains an index of the attributes and elements it contains to optimise
* lookups via name.
*
* @author James Strachan
* @version $Revision: 1.10 $
*/
@SuppressWarnings("unchecked")
public class IndexedElement extends DefaultElement {
private static final long serialVersionUID = 1L;
/**
* Lazily constructed index for elements
*
* Keys are of type QName and String
*
* Values are of type Element and List<Element>
*/
private Map elementIndex;
/**
* Lazily constructed index for attributes
* Keys are of type QName and String
*
* Values are of type <A>
*/
private Map attributeIndex;
public IndexedElement(String name) {
super(name);
}
public IndexedElement(QName qname) {
super(qname);
}
public IndexedElement(QName qname, int attributeCount) {
super(qname, attributeCount);
}
public Attribute attribute(String name) {
return attributeIndex().get(name);
}
public Attribute attribute(QName qName) {
return attributeIndex().get(qName);
}
public Element element(String name) {
return asElement(elementIndex().get(name));
}
public Element element(QName qName) {
return asElement(elementIndex().get(qName));
}
public List elements(String name) {
return asElementList(elementIndex().get(name));
}
public List elements(QName qName) {
return asElementList(elementIndex().get(qName));
}
// Implementation methods
// -------------------------------------------------------------------------
protected Element asElement(Object object) {
if (object instanceof Element) {
return (Element) object;
} else if (object != null) {
List list = (List) object;
if (list.size() >= 1) {
return list.get(0);
}
}
return null;
}
protected List asElementList(Object object) {
if (object instanceof Element) {
return createSingleResultList((Element) object);
} else if (object != null) {
List list = (List) object;
BackedList answer = createResultList();
for (Element aList : list) {
answer.addLocal(aList);
}
return answer;
}
return createEmptyList();
}
/**
* DOCUMENT ME!
*
* @param object
* DOCUMENT ME!
*
* @return DOCUMENT ME!
*
* @deprecated WILL BE REMOVED IN dom4j-1.6 !!
*/
protected Iterator asElementIterator(Object object) {
return asElementList(object).iterator();
}
// #### could we override the add(Element) remove(Element methods?
protected void addNode(Node node) {
super.addNode(node);
if ((elementIndex != null) && node instanceof Element) {
addToElementIndex((Element) node);
} else if ((attributeIndex != null) && node instanceof Attribute) {
addToAttributeIndex((Attribute) node);
}
}
protected boolean removeNode(Node node) {
if (super.removeNode(node)) {
if ((elementIndex != null) && node instanceof Element) {
removeFromElementIndex((Element) node);
} else if ((attributeIndex != null) && node instanceof Attribute) {
removeFromAttributeIndex((Attribute) node);
}
return true;
}
return false;
}
protected Map attributeIndex() {
if (attributeIndex == null) {
attributeIndex = createAttributeIndex();
for (Iterator iter = attributeIterator(); iter.hasNext();) {
addToAttributeIndex(iter.next());
}
}
return attributeIndex;
}
protected Map elementIndex() {
if (elementIndex == null) {
elementIndex = createElementIndex();
for (Iterator iter = elementIterator(); iter.hasNext();) {
addToElementIndex(iter.next());
}
}
return elementIndex;
}
/**
* A Factory Method to create the index for attributes
*
* @return DOCUMENT ME!
*/
protected Map createAttributeIndex() {
return createIndex();
}
/**
* A Factory Method to create the index for elements
*
* @return DOCUMENT ME!
*/
protected Map createElementIndex() {
return createIndex();
}
protected void addToElementIndex(Element element) {
QName qName = element.getQName();
String name = qName.getName();
addToElementIndex(qName, element);
addToElementIndex(name, element);
}
protected void addToElementIndex(Object key, Element value) {
Object oldValue = elementIndex.get(key);
if (oldValue == null) {
elementIndex.put(key, value);
} else {
if (oldValue instanceof List) {
List list = (List) oldValue;
list.add(value);
} else {
List list = createList();
list.add((Element) oldValue);
list.add(value);
elementIndex.put(key, list);
}
}
}
protected void removeFromElementIndex(Element element) {
QName qName = element.getQName();
String name = qName.getName();
removeFromElementIndex(qName, element);
removeFromElementIndex(name, element);
}
protected void removeFromElementIndex(Object key, Element value) {
Object oldValue = elementIndex.get(key);
if (oldValue instanceof List) {
List list = (List) oldValue;
list.remove(value);
} else {
elementIndex.remove(key);
}
}
protected void addToAttributeIndex(Attribute attribute) {
QName qName = attribute.getQName();
String name = qName.getName();
addToAttributeIndex(qName, attribute);
addToAttributeIndex(name, attribute);
}
protected void addToAttributeIndex(Object key, Attribute value) {
Object oldValue = attributeIndex.get(key);
if (oldValue != null) {
attributeIndex.put(key, value);
}
}
protected void removeFromAttributeIndex(Attribute attribute) {
QName qName = attribute.getQName();
String name = qName.getName();
removeFromAttributeIndex(qName, attribute);
removeFromAttributeIndex(name, attribute);
}
protected void removeFromAttributeIndex(Object key, Attribute value) {
Object oldValue = attributeIndex.get(key);
if ((oldValue != null) && oldValue.equals(value)) {
attributeIndex.remove(key);
}
}
/**
* Factory method to return a new map implementation for indices
*
* @param DOCUMENT ME!
* @return DOCUMENT ME!
*/
protected Map createIndex() {
return new HashMap();
}
/**
* Factory method to return a list implementation for indices
*
* @param DOCUMENT ME!
* @return DOCUMENT ME!
*/
protected List createList() {
return new ArrayList();
}
}
/*
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain copyright statements and
* notices. Redistributions must also contain a copy of this document.
*
* 2. 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.
*
* 3. The name "DOM4J" must not be used to endorse or promote products derived
* from this Software without prior written permission of MetaStuff, Ltd. For
* written permission, please contact [email protected].
*
* 4. Products derived from this Software may not be called "DOM4J" nor may
* "DOM4J" appear in their names without prior written permission of MetaStuff,
* Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
*
* 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
*
* THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESSED 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 METASTUFF, LTD. OR ITS 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.
*
* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
*/
