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XMLTooling-J is a low-level library that may be used to construct libraries that allow developers to work with XML in a Java beans manner.
/*
* Licensed to the University Corporation for Advanced Internet Development,
* Inc. (UCAID) under one or more contributor license agreements. See the
* NOTICE file distributed with this work for additional information regarding
* copyright ownership. The UCAID 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.opensaml.xml.util;
import java.util.AbstractList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import javax.xml.namespace.QName;
import net.jcip.annotations.NotThreadSafe;
import org.opensaml.xml.XMLObject;
/**
* A list which indexes XMLObjects by their schema type and element QName for quick retrival based on those items.
*
* @param the type of element added to the list
*/
@NotThreadSafe
public class IndexedXMLObjectChildrenList extends XMLObjectChildrenList {
/** Index of objects by type and name. */
private Map> objectIndex;
/**
* Constructor.
*
* @param parent the parent of the {@link XMLObject}s added to the list
*/
public IndexedXMLObjectChildrenList(XMLObject parent) {
super(parent);
objectIndex = new LazyMap>();
}
/**
* Constructor.
*
* @param parent the parent of all elements
* @param col collection to add to this list
*/
public IndexedXMLObjectChildrenList(XMLObject parent, Collection col) {
super(parent);
objectIndex = new LazyMap>();
addAll(col);
}
/**
* Inserts the specified element at the specified position in this list. Shifts the element currently at that
* position (if any) and any subsequent elements to the right (adds one to their indices).
*
* @param index index of element to add
* @param element element to be stored at the specified position
*/
public void add(int index, ElementType element) {
super.add(index, element);
indexElement(element);
}
/** {@inheritDoc} */
public void clear() {
super.clear();
objectIndex.clear();
}
/**
* Retrieves all the SAMLObjects that have given schema type or element name.
*
* @param typeOrName the schema type or element name
*
* @return list of SAMLObjects that have given schema type or element name, which may be empty.
* Will not be null.
*/
public List get(QName typeOrName) {
checkAndCreateIndex(typeOrName);
return objectIndex.get(typeOrName);
}
/**
* Check for the existence of an index for the specified QName and create it
* if it doesn't exist.
*
* @param index the index to check
*/
protected void checkAndCreateIndex(QName index) {
if (!objectIndex.containsKey(index)) {
objectIndex.put(index, new LazyList());
}
}
/**
* Indexes the given SAMLObject by type and element name.
*
* @param element the SAMLObject to index
*/
protected void indexElement(ElementType element) {
if (element == null) {
return;
}
QName type = element.getSchemaType();
if (type != null) {
indexElement(type, element);
}
indexElement(element.getElementQName(), element);
}
/**
* Indexes the given SAMLobject by the given index.
*
* @param index the index for the element
* @param element the element to be indexed
*/
protected void indexElement(QName index, ElementType element) {
List objects = get(index);
objects.add(element);
}
/**
* Removes a given element from the list and index.
*
* @param element the element to be removed
*
* @return true if the element was in the list and removed, false if not
*/
public boolean remove(ElementType element) {
boolean elementRemoved = false;
elementRemoved = super.remove(element);
if (elementRemoved) {
removeElementFromIndex(element);
}
return elementRemoved;
}
/**
* Removes the element at the specified position in this list. Shifts any subsequent elements to the left (subtracts
* one from their indices). Returns the element that was removed from the list
*
* @param index the index of the element to remove
*
* @return the element removed from the list
*/
public ElementType remove(int index) {
ElementType returnValue = super.remove(index);
removeElementFromIndex(returnValue);
return returnValue;
}
/**
* Removes the given element from the schema type and element qname index.
*
* @param element the element to remove from the index
*/
protected void removeElementFromIndex(ElementType element) {
if (element == null) {
return;
}
QName type = element.getSchemaType();
if (type != null) {
removeElementFromIndex(type, element);
}
removeElementFromIndex(element.getElementQName(), element);
}
/**
* Removes an object from the given index id.
*
* @param index the id of the index
* @param element the element to be removed from that index
*/
protected void removeElementFromIndex(QName index, ElementType element) {
List objects = get(index);
objects.remove(element);
}
/**
* Replaces the element at the specified position in this list with the specified element.
*
* @param index index of element to replace
* @param element element to be stored at the specified position
*
* @return the element previously at the specified position
*/
public ElementType set(int index, ElementType element) {
ElementType returnValue = super.set(index, element);
removeElementFromIndex(returnValue);
indexElement(element);
return returnValue;
}
/**
* Returns a view of the list that only contains elements stored under the given index. The returned list is backed
* by this list so and supports all optional operations, so changes made to the returned list are reflected in this
* list.
*
* @param index index of the elements returned in the list view
*
* @return a view of this list that contains only the elements stored under the given index
*/
public List subList(QName index) {
checkAndCreateIndex(index);
return new ListView(this, index);
}
}
/**
* A special list that works as a view of an IndexedXMLObjectChildrenList showing only the sublist associated with a
* given index. Operations performed on this sublist are reflected in the backing list. Index-based mutation operations
* are not supported.
*
* @param the XMLObject type that this list operates on
*/
class ListView extends AbstractList {
/** List that backs this view. */
private IndexedXMLObjectChildrenList backingList;
/** Index that points to the list, in the backing list, that this view operates on. */
private QName index;
/** List, in the backing list, that the given index points to. */
private List indexList;
/**
* Constructor.
*
* @param newBackingList the list that backs this view
* @param newIndex the element schema type or name of the sublist this view operates on
*/
public ListView(IndexedXMLObjectChildrenList newBackingList, QName newIndex) {
backingList = newBackingList;
index = newIndex;
indexList = backingList.get(index);
}
/** {@inheritDoc} */
public boolean add(ElementType o) {
boolean result = backingList.add(o);
indexList = backingList.get(index);
return result;
}
/** {@inheritDoc} */
public void add(int newIndex, ElementType element) {
throw new UnsupportedOperationException();
}
/** {@inheritDoc} */
public boolean addAll(Collection c) {
boolean result = backingList.addAll(c);
indexList = backingList.get(index);
return result;
}
/** {@inheritDoc} */
public boolean addAll(int index, Collection c) {
throw new UnsupportedOperationException();
}
/** {@inheritDoc} */
public void clear() {
// Create a copy of the current list to avoid a potential concurrent modification error.
LazyList copy = new LazyList();
copy.addAll(indexList);
backingList.removeAll(copy);
indexList = backingList.get(index);
}
/**
* Checks to see if the given element is contained in this list.
*
* @param element the element to check for
*
* @return true if the element is in this list, false if not
*/
public boolean contains(Object element) {
return indexList.contains(element);
}
/** {@inheritDoc} */
public boolean containsAll(Collection c) {
return indexList.containsAll(c);
}
/** {@inheritDoc} */
public ElementType get(int newIndex) {
return indexList.get(newIndex);
}
/** {@inheritDoc} */
public int indexOf(Object o) {
return indexList.indexOf(o);
}
/** {@inheritDoc} */
public boolean isEmpty() {
return indexList.isEmpty();
}
/** {@inheritDoc} */
public int lastIndexOf(Object o) {
return indexList.lastIndexOf(o);
}
/** {@inheritDoc} */
public ElementType remove(int newIndex) {
throw new UnsupportedOperationException();
}
/** {@inheritDoc} */
public boolean remove(Object o) {
boolean result = backingList.remove(o);
indexList = backingList.get(index);
return result;
}
/** {@inheritDoc} */
public boolean removeAll(Collection c) {
boolean result = backingList.removeAll(c);
indexList = backingList.get(index);
return result;
}
/** {@inheritDoc} */
public boolean retainAll(Collection c) {
boolean result = backingList.retainAll(c);
indexList = backingList.get(index);
return result;
}
/** {@inheritDoc} */
public ElementType set(int newIndex, ElementType element) {
throw new UnsupportedOperationException();
}
/** {@inheritDoc} */
public int size() {
return indexList.size();
}
/** {@inheritDoc} */
public Object[] toArray() {
return indexList.toArray();
}
/** {@inheritDoc} */
public T[] toArray(T[] a) {
return indexList.toArray(a);
}
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