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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.
/*
* Copyright [2005] [University Corporation for Advanced Internet Development, Inc.]
*
* Licensed 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;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import javax.xml.namespace.QName;
import org.opensaml.xml.schema.XSBooleanValue;
import org.opensaml.xml.util.DatatypeHelper;
import org.opensaml.xml.util.IDIndex;
import org.opensaml.xml.util.XMLConstants;
import org.opensaml.xml.util.XMLHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Element;
/**
* An abstract implementation of XMLObject.
*/
public abstract class AbstractXMLObject implements XMLObject {
/** Class logger. */
private final Logger log = LoggerFactory.getLogger(AbstractXMLObject.class);
/** Parent of this element. */
private XMLObject parent;
/** The name of this element with namespace and prefix information. */
private QName elementQname;
/** Schema locations for this XML object. */
private String schemaLocation;
/** No-namespace schema locations for this XML object. */
private String noNamespaceSchemaLocation;
/** The schema type of this element with namespace and prefix information. */
private QName typeQname;
/** DOM Element representation of this object. */
private Element dom;
/** The value of the xsi:nil attribute. */
private XSBooleanValue nil;
/** The namespace manager for this XML object. */
private NamespaceManager nsManager;
/**
* Mapping of ID attributes to XMLObjects in the subtree rooted at this object. This allows constant-time
* dereferencing of ID-typed attributes within the subtree.
*/
private final IDIndex idIndex;
/**
* Constructor.
*
* @param namespaceURI the namespace the element is in
* @param elementLocalName the local name of the XML element this Object represents
* @param namespacePrefix the prefix for the given namespace
*/
protected AbstractXMLObject(String namespaceURI, String elementLocalName, String namespacePrefix) {
nsManager = new NamespaceManager(this);
idIndex = new IDIndex(this);
elementQname = XMLHelper.constructQName(namespaceURI, elementLocalName, namespacePrefix);
if(namespaceURI != null){
setElementNamespacePrefix(namespacePrefix);
}
}
/** {@inheritDoc} */
public void addNamespace(Namespace newNamespace) {
getNamespaceManager().registerNamespace(newNamespace);
}
/** {@inheritDoc} */
public void detach(){
releaseParentDOM(true);
parent = null;
}
/** {@inheritDoc} */
public Element getDOM() {
return dom;
}
/** {@inheritDoc} */
public QName getElementQName() {
return new QName(elementQname.getNamespaceURI(), elementQname.getLocalPart(), elementQname.getPrefix());
}
/** {@inheritDoc} */
public IDIndex getIDIndex() {
return idIndex;
}
/** {@inheritDoc} */
public NamespaceManager getNamespaceManager() {
return nsManager;
}
/** {@inheritDoc} */
public Set getNamespaces() {
return Collections.unmodifiableSet(getNamespaceManager().getNamespaces());
}
/** {@inheritDoc} */
public String getNoNamespaceSchemaLocation() {
return noNamespaceSchemaLocation;
}
/**
* Gets the parent of this element.
*
* @return the parent of this element
*/
public XMLObject getParent() {
return parent;
}
/** {@inheritDoc} */
public String getSchemaLocation() {
return schemaLocation;
}
/** {@inheritDoc} */
public QName getSchemaType() {
return typeQname;
}
/** {@inheritDoc} */
public boolean hasChildren() {
List children = getOrderedChildren();
return children != null && children.size() > 0;
}
/** {@inheritDoc} */
public boolean hasParent() {
return getParent() != null;
}
/**
* A helper function for derived classes. This method should be called when the value of a
* namespace-qualified attribute changes.
*
* @param attributeName the attribute name
* @param hasValue true to indicate that the attribute has a value, false to indicate it has no value
*/
protected void manageQualifiedAttributeNamespace(QName attributeName, boolean hasValue) {
if (hasValue) {
getNamespaceManager().registerAttributeName(attributeName);
} else {
getNamespaceManager().deregisterAttributeName(attributeName);
}
}
/**
* A helper function for derived classes. This checks for semantic equality between two QNames if it they are
* different invalidates the DOM. It returns the normalized value so subclasses just have to go. this.foo =
* prepareForAssignment(this.foo, foo);
*
* @param oldValue - the current value
* @param newValue - the new value
*
* @return the value that should be assigned
*
* @deprecated replacement {@link #prepareAttributeValueForAssignment(String, QName, QName)}
* or {@link #prepareElementContentForAssignment(QName, QName)} as appropriate
*/
protected QName prepareForAssignment(QName oldValue, QName newValue) {
if (oldValue == null) {
if (newValue != null) {
Namespace newNamespace = new Namespace(newValue.getNamespaceURI(), newValue.getPrefix());
addNamespace(newNamespace);
releaseThisandParentDOM();
return newValue;
} else {
return null;
}
}
if (!oldValue.equals(newValue)) {
if (newValue != null) {
Namespace newNamespace = new Namespace(newValue.getNamespaceURI(), newValue.getPrefix());
addNamespace(newNamespace);
}
releaseThisandParentDOM();
}
return newValue;
}
/**
* A helper function for derived classes. This checks for semantic equality between two QNames if it they are
* different invalidates the DOM. It returns the normalized value so subclasses just have to go. this.foo =
* prepareElementContentForAssignment(this.foo, foo);
*
* @param oldValue - the current value
* @param newValue - the new value
*
* @return the value that should be assigned
*/
protected QName prepareElementContentForAssignment(QName oldValue, QName newValue) {
if (oldValue == null) {
if (newValue != null) {
getNamespaceManager().registerContentValue(newValue);
releaseThisandParentDOM();
return newValue;
} else {
return null;
}
}
// Old value was not null, so go ahead and deregister it
getNamespaceManager().deregisterContentValue();
if (!oldValue.equals(newValue)) {
if (newValue != null) {
getNamespaceManager().registerContentValue(newValue);
}
releaseThisandParentDOM();
}
return newValue;
}
/**
* A helper function for derived classes. This checks for semantic equality between two QNames if it they are
* different invalidates the DOM. It returns the normalized value so subclasses just have to go. this.foo =
* prepareAttributeValueForAssignment(this.foo, foo);
*
* @param attributeID - unique identifier of the attribute in the content model within this XMLObject, used to
* identify the attribute within the XMLObject's NamespaceManager
* @param oldValue - the current value
* @param newValue - the new value
*
* @return the value that should be assigned
*/
protected QName prepareAttributeValueForAssignment(String attributeID, QName oldValue, QName newValue) {
if (oldValue == null) {
if (newValue != null) {
getNamespaceManager().registerAttributeValue(attributeID, newValue);
releaseThisandParentDOM();
return newValue;
} else {
return null;
}
}
// Old value was not null, so go ahead and deregister it
getNamespaceManager().deregisterAttributeValue(attributeID);
if (!oldValue.equals(newValue)) {
if (newValue != null) {
getNamespaceManager().registerAttributeValue(attributeID, newValue);
}
releaseThisandParentDOM();
}
return newValue;
}
/**
* A helper function for derived classes. This 'nornmalizes' newString and then if it is different from oldString
* invalidates the DOM. It returns the normalized value so subclasses just have to go. this.foo =
* prepareForAssignment(this.foo, foo);
*
* @param oldValue - the current value
* @param newValue - the new value
*
* @return the value that should be assigned
*/
protected String prepareForAssignment(String oldValue, String newValue) {
String newString = DatatypeHelper.safeTrimOrNullString(newValue);
if (!DatatypeHelper.safeEquals(oldValue, newString)) {
releaseThisandParentDOM();
}
return newString;
}
/**
* A helper function for derived classes that checks to see if the old and new value are equal and if so releases
* the cached dom. Derived classes are expected to use this thus:
* this.foo = prepareForAssignment(this.foo, foo);
*
*
* This method will do a (null) safe compare of the objects and will also invalidate the DOM if appropriate
*
* @param - type of object being compared and assigned
* @param oldValue - current value
* @param newValue - proposed new value
*
* @return The value to assign to the saved Object.
*/
protected T prepareForAssignment(T oldValue, T newValue) {
if (oldValue == null) {
if (newValue != null) {
releaseThisandParentDOM();
return newValue;
} else {
return null;
}
}
if (!oldValue.equals(newValue)) {
releaseThisandParentDOM();
}
return newValue;
}
/**
* A helper function for derived classes, similar to assignString, but for (singleton) SAML objects. It is
* indifferent to whether either the old or the new version of the value is null. Derived classes are expected to
* use this thus:
* this.foo = prepareForAssignment(this.foo, foo);
*
*
* This method will do a (null) safe compare of the objects and will also invalidate the DOM if appropriate
*
* @param type of object being compared and assigned
* @param oldValue current value
* @param newValue proposed new value
*
* @return The value to assign to the saved Object.
*/
protected T prepareForAssignment(T oldValue, T newValue) {
if (newValue != null && newValue.hasParent()) {
throw new IllegalArgumentException(newValue.getClass().getName()
+ " cannot be added - it is already the child of another SAML Object");
}
if (oldValue == null) {
if (newValue != null) {
releaseThisandParentDOM();
newValue.setParent(this);
idIndex.registerIDMappings(newValue.getIDIndex());
return newValue;
} else {
return null;
}
}
if (!oldValue.equals(newValue)) {
oldValue.setParent(null);
releaseThisandParentDOM();
idIndex.deregisterIDMappings(oldValue.getIDIndex());
if (newValue != null) {
newValue.setParent(this);
idIndex.registerIDMappings(newValue.getIDIndex());
}
}
return newValue;
}
/**
* A helper function for derived classes. The mutator/setter method for any ID-typed attributes should call this
* method in order to handle getting the old value removed from the ID-to-XMLObject mapping, and the new value added
* to the mapping.
*
* @param oldID the old value of the ID-typed attribute
* @param newID the new value of the ID-typed attribute
*/
protected void registerOwnID(String oldID, String newID) {
String newString = DatatypeHelper.safeTrimOrNullString(newID);
if (!DatatypeHelper.safeEquals(oldID, newString)) {
if (oldID != null) {
idIndex.deregisterIDMapping(oldID);
}
if (newString != null) {
idIndex.registerIDMapping(newString, this);
}
}
}
/** {@inheritDoc} */
public void releaseChildrenDOM(boolean propagateRelease) {
log.trace("Releasing cached DOM reprsentation for children of {} with propagation set to {}",
getElementQName(), propagateRelease);
if (getOrderedChildren() != null) {
for (XMLObject child : getOrderedChildren()) {
if (child != null) {
child.releaseDOM();
if (propagateRelease) {
child.releaseChildrenDOM(propagateRelease);
}
}
}
}
}
/** {@inheritDoc} */
public void releaseDOM() {
log.trace("Releasing cached DOM reprsentation for {}", getElementQName());
setDOM(null);
}
/** {@inheritDoc} */
public void releaseParentDOM(boolean propagateRelease) {
log.trace("Releasing cached DOM reprsentation for parent of {} with propagation set to {}", getElementQName(),
propagateRelease);
XMLObject parentElement = getParent();
if (parentElement != null) {
parent.releaseDOM();
if (propagateRelease) {
parent.releaseParentDOM(propagateRelease);
}
}
}
/**
* A convience method that is equal to calling {@link #releaseDOM()} then {@link #releaseChildrenDOM(boolean)} with
* the release being propogated.
*/
public void releaseThisAndChildrenDOM() {
if (getDOM() != null) {
releaseDOM();
releaseChildrenDOM(true);
}
}
/**
* A convience method that is equal to calling {@link #releaseDOM()} then {@link #releaseParentDOM(boolean)} with
* the release being propogated.
*/
public void releaseThisandParentDOM() {
if (getDOM() != null) {
releaseDOM();
releaseParentDOM(true);
}
}
/** {@inheritDoc} */
public void removeNamespace(Namespace namespace) {
getNamespaceManager().deregisterNamespace(namespace);
}
/** {@inheritDoc} */
public XMLObject resolveID(String id) {
return idIndex.lookup(id);
}
/** {@inheritDoc} */
public XMLObject resolveIDFromRoot(String id) {
XMLObject root = this;
while (root.hasParent()) {
root = root.getParent();
}
return root.resolveID(id);
}
/** {@inheritDoc} */
public void setDOM(Element newDom) {
dom = newDom;
}
/**
* Sets the prefix for this element's namespace.
*
* @param prefix the prefix for this element's namespace
*/
public void setElementNamespacePrefix(String prefix) {
if (prefix == null) {
elementQname = new QName(elementQname.getNamespaceURI(), elementQname.getLocalPart());
} else {
elementQname = new QName(elementQname.getNamespaceURI(), elementQname.getLocalPart(), prefix);
}
getNamespaceManager().registerElementName(elementQname);
}
/**
* Sets the element QName.
*
* @param elementQName the element's QName
*/
protected void setElementQName(QName elementQName) {
this.elementQname = XMLHelper.constructQName(elementQName.getNamespaceURI(), elementQName.getLocalPart(),
elementQName.getPrefix());
getNamespaceManager().registerElementName(this.elementQname);
}
/** {@inheritDoc} */
public void setNoNamespaceSchemaLocation(String location) {
noNamespaceSchemaLocation = DatatypeHelper.safeTrimOrNullString(location);
manageQualifiedAttributeNamespace(XMLConstants.XSI_NO_NAMESPACE_SCHEMA_LOCATION_ATTRIB_NAME, schemaLocation != null);
}
/** {@inheritDoc} */
public void setParent(XMLObject newParent) {
parent = newParent;
}
/** {@inheritDoc} */
public void setSchemaLocation(String location) {
schemaLocation = DatatypeHelper.safeTrimOrNullString(location);
manageQualifiedAttributeNamespace(XMLConstants.XSI_SCHEMA_LOCATION_ATTRIB_NAME, schemaLocation != null);
}
/**
* Sets a given QName as the schema type for the Element represented by this XMLObject. This will register the namespace
* for the type as well as for the xsi:type qualified attribute name with the namespace manager for this XMLObject.
* If null is passed, the type name and xsi:type name will be deregistered.
*
* @param type the schema type
*/
protected void setSchemaType(QName type) {
typeQname = type;
getNamespaceManager().registerElementType(typeQname);
manageQualifiedAttributeNamespace(XMLConstants.XSI_TYPE_ATTRIB_NAME, typeQname != null);
}
/** {@inheritDoc} */
public Boolean isNil() {
if (nil != null) {
return nil.getValue();
}
return Boolean.FALSE;
}
/** {@inheritDoc} */
public XSBooleanValue isNilXSBoolean() {
return nil;
}
/** {@inheritDoc} */
public void setNil(Boolean newNil) {
if (newNil != null) {
nil = prepareForAssignment(nil, new XSBooleanValue(newNil, false));
} else {
nil = prepareForAssignment(nil, null);
}
manageQualifiedAttributeNamespace(XMLConstants.XSI_NIL_ATTRIB_NAME, nil != null);
}
/** {@inheritDoc} */
public void setNil(XSBooleanValue newNil) {
nil = prepareForAssignment(nil, newNil);
manageQualifiedAttributeNamespace(XMLConstants.XSI_NIL_ATTRIB_NAME, nil != null);
}
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