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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 2010 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.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.xml.namespace.QName;
import org.opensaml.xml.util.DatatypeHelper;
import org.opensaml.xml.util.LazyMap;
import org.opensaml.xml.util.LazySet;
import org.opensaml.xml.util.XMLConstants;
/**
* A class which is responsible for managing XML namespace-related data for an {@link XMLObject}.
*
*
* Code which mutates the state of an XMLObject such that XML namespace-related data is also logically changed,
* should call the appropriate method, based on the type of change being made.
*
*/
public class NamespaceManager {
/** The token used to represent the default namespace in {@link #getNonVisibleNamespacePrefixes()}. */
public static final String DEFAULT_NS_TOKEN = "#default";
/** The 'xml' namespace. */
private static final Namespace XML_NAMESPACE =
new Namespace(XMLConstants.XML_NS, XMLConstants.XML_PREFIX);
/** The 'xsi' namespace. */
private static final Namespace XSI_NAMESPACE =
new Namespace(XMLConstants.XSI_NS, XMLConstants.XSI_PREFIX);
/** The owning XMLObject. */
private XMLObject owner;
/** XMLObject name namespace. */
private Namespace elementName;
/** XMLObject type namespace. */
private Namespace elementType;
/** Explicitly declared namespaces. */
private Set decls;
/** Indeterminate namespace usage. */
private Set usage;
/** Registered namespaces of attribute names. */
private Set attrNames;
/** Registered namespaces of attribute values. */
private Map attrValues;
/** Registered namespaces of content values. */
private Namespace contentValue;
/**
* Constructor.
*
* @param owningObject the XMLObject whose namespace info is to be managed
*/
public NamespaceManager(XMLObject owningObject) {
owner = owningObject;
decls = new LazySet();
usage = new LazySet();
attrNames = new LazySet();
attrValues = new LazyMap();
}
/**
* From an QName representing a qualified attribute name, generate an attribute ID
* suitable for use in {@link #registerAttributeValue(String, QName)}
* and {@link #deregisterAttributeValue(String)}.
*
* @param name attribute name as a QName
* @return a string attribute ID
*/
public static String generateAttributeID(QName name) {
return name.toString();
}
/**
* Get the owning XMLObject instance.
*
* @return the owning XMLObject
*/
public XMLObject getOwner() {
return owner;
}
/**
* Get the set of namespaces currently in use on the owning XMLObject.
*
* @return the set of namespaces
*/
public Set getNamespaces() {
Set namespaces = mergeNamespaceCollections(decls, usage, attrNames, attrValues.values());
addNamespace(namespaces, getElementNameNamespace());
addNamespace(namespaces, getElementTypeNamespace());
addNamespace(namespaces, contentValue);
return namespaces;
}
/**
* Register usage of a namespace in some indeterminate fashion.
*
*
* Other methods which indicate specific usage should be preferred over this one. This
* method exists primarily for backward-compatibility support for {@link XMLObject#addNamespace(Namespace)}.
*
*
* @param namespace namespace to register
*/
public void registerNamespace(Namespace namespace) {
addNamespace(usage, namespace);
}
/**
* Deregister usage of a namespace in some indeterminate fashion.
*
*
* Other methods which indicate specific usage should be preferred over this one. This
* method exists primarily for backward-compatibility support for {@link XMLObject#removeNamespace(Namespace)}.
*
*
* @param namespace namespace to deregister
*/
public void deregisterNamespace(Namespace namespace) {
removeNamespace(usage, namespace);
}
/**
* Register a namespace declaration.
*
* @param namespace the namespace to register
*/
public void registerNamespaceDeclaration(Namespace namespace) {
namespace.setAlwaysDeclare(true);
addNamespace(decls, namespace);
}
/**
* Deregister a namespace declaration.
*
* @param namespace the namespace to deregister
*/
public void deregisterNamespaceDeclaration(Namespace namespace) {
removeNamespace(decls, namespace);
}
/**
* Register a namespace-qualified attribute name.
*
* @param attributeName the attribute name to register
*/
public void registerAttributeName(QName attributeName) {
if (checkQName(attributeName)) {
addNamespace(attrNames, buildNamespace(attributeName));
}
}
/**
* Deregister a namespace-qualified attribute name.
*
* @param attributeName the attribute name to deregister
*/
public void deregisterAttributeName(QName attributeName) {
if (checkQName(attributeName)) {
removeNamespace(attrNames, buildNamespace(attributeName));
}
}
/**
* Register a QName attribute value.
*
* @param attributeID unique identifier for the attribute within the XMLObject's content model
* @param attributeValue the QName value to register
*/
public void registerAttributeValue(String attributeID, QName attributeValue) {
if (checkQName(attributeValue)) {
attrValues.put(attributeID, buildNamespace(attributeValue));
}
}
/**
* Deregister a QName attribute value.
*
* @param attributeID unique identifier for the attribute within the XMLObject's content model
*/
public void deregisterAttributeValue(String attributeID) {
attrValues.remove(attributeID);
}
/**
* Register a QName element content value.
*
* @param content the QName value to register
*/
public void registerContentValue(QName content) {
if (checkQName(content)) {
contentValue = buildNamespace(content);
}
}
/**
* Deregister a QName content value.
*
*/
public void deregisterContentValue() {
contentValue = null;
}
/**
* Obtain the set of namespace prefixes used in a non-visible manner on owning XMLObject
* and its children.
*
*
* The primary use case for this information is to support the inclusive prefixes
* information that may optionally be supplied as a part of XML exclusive canonicalization.
*
*
* @return the set of non-visibly used namespace prefixes
*/
public Set getNonVisibleNamespacePrefixes() {
LazySet prefixes = new LazySet();
addPrefixes(prefixes, getNonVisibleNamespaces());
return prefixes;
}
/**
* Obtain the set of namespaces used in a non-visible manner on owning XMLObject
* and its children.
*
*
* The primary use case for this information is to support the inclusive prefixes
* information that may optionally be supplied as a part of XML exclusive canonicalization.
*
*
*
* The Namespace instances themselves will be copied before being returned, so
* modifications to them do not affect the actual Namespace instances in the
* underlying tree. The original alwaysDeclare property is not preserved.
*
*
* @return the set of non-visibly used namespaces
*/
public Set getNonVisibleNamespaces() {
LazySet nonVisibleCandidates = new LazySet();
// Collect each child's non-visible namespaces
List children = getOwner().getOrderedChildren();
if (children != null) {
for(XMLObject child : getOwner().getOrderedChildren()) {
if (child != null) {
Set childNonVisibleNamespaces = child.getNamespaceManager().getNonVisibleNamespaces();
if (childNonVisibleNamespaces != null && ! childNonVisibleNamespaces.isEmpty()) {
nonVisibleCandidates.addAll(childNonVisibleNamespaces);
}
}
}
}
// Collect this node's non-visible candidate namespaces
nonVisibleCandidates.addAll(getNonVisibleNamespaceCandidates());
// Now subtract this object's visible namespaces
nonVisibleCandidates.removeAll(getVisibleNamespaces());
// As a special case, never return the 'xml' prefix.
nonVisibleCandidates.remove(XML_NAMESPACE);
// What remains is the effective set of non-visible namespaces
// for the subtree rooted at this node.
return nonVisibleCandidates;
}
/**
* Get the set of all namespaces which are in scope within the subtree rooted
* at the owning XMLObject.
*
*
* The Namespace instances themselves will be copied before being returned, so
* modifications to them do not affect the actual Namespace instances in the
* underlying tree. The original alwaysDeclare property is not preserved.
*
*
* @return set of all namespaces in scope for the owning object
*/
public Set getAllNamespacesInSubtreeScope() {
LazySet namespaces = new LazySet();
// Collect namespaces for the subtree rooted at each child
List children = getOwner().getOrderedChildren();
if (children != null) {
for(XMLObject child : getOwner().getOrderedChildren()) {
if (child != null) {
Set childNamespaces = child.getNamespaceManager().getAllNamespacesInSubtreeScope();
if (childNamespaces != null && ! childNamespaces.isEmpty()) {
namespaces.addAll(childNamespaces);
}
}
}
}
// Collect this node's namespaces. Copy before adding to the set. Do not preserve alwaysDeclare.
for (Namespace myNS : getNamespaces()) {
namespaces.add(copyNamespace(myNS));
}
return namespaces;
}
/**
* Register the owning XMLObject's element name.
*
* @param name the element name to register
*/
public void registerElementName(QName name) {
if (checkQName(name)) {
elementName = buildNamespace(name);
}
}
/**
* Register the owning XMLObject's element type, if explicitly declared via an xsi:type.
*
* @param type the element type to register
*/
public void registerElementType(QName type) {
if (type != null) {
if (checkQName(type)) {
elementType = buildNamespace(type);
}
} else {
elementType = null;
}
}
/**
* Return a Namespace instance representing the namespace of the element name.
*
* @return the element name's namespace
*/
private Namespace getElementNameNamespace() {
if (elementName == null && checkQName(owner.getElementQName())) {
elementName = buildNamespace(owner.getElementQName());
}
return elementName;
}
/**
* Return a Namespace instance representing the namespace of the element type, if known.
*
* @return the element type's namespace
*/
private Namespace getElementTypeNamespace() {
if (elementType == null) {
QName type = owner.getSchemaType();
if (type != null && checkQName(type)) {
elementType = buildNamespace(type);
}
}
return elementType;
}
/**
* Build a {@link Namespace} instance from a {@link QName}.
*
* @param name the source QName
* @return a Namespace built using the information in the QName
*/
private Namespace buildNamespace(QName name) {
String uri = DatatypeHelper.safeTrimOrNullString(name.getNamespaceURI());
if (uri == null) {
throw new IllegalArgumentException("A non-empty namespace URI must be supplied");
}
String prefix = DatatypeHelper.safeTrimOrNullString(name.getPrefix());
return new Namespace(uri, prefix);
}
/**
* Add a Namespace to a set of Namespaces. Namespaces with identical URI and prefix will be treated as equivalent.
* An alwaysDeclare property of true will take precedence over a value of false.
*
* @param namespaces the set of namespaces
* @param newNamespace the namespace to add to the set
*/
private void addNamespace(Set namespaces, Namespace newNamespace) {
if (newNamespace == null) {
return;
}
if (namespaces.size() == 0) {
namespaces.add(newNamespace);
return;
}
for (Namespace namespace : namespaces) {
if (DatatypeHelper.safeEquals(namespace.getNamespaceURI(), newNamespace.getNamespaceURI()) &&
DatatypeHelper.safeEquals(namespace.getNamespacePrefix(), newNamespace.getNamespacePrefix())) {
if (newNamespace.alwaysDeclare() && !namespace.alwaysDeclare()) {
// An alwaysDeclare=true trumps false.
// Don't modify the existing object in the set, merely swap them.
namespaces.remove(namespace);
namespaces.add(newNamespace);
return;
} else {
// URI and prefix match, alwaysDeclare does also, so just leave the original
return;
}
}
}
namespaces.add(newNamespace);
}
/**
* Remove a Namespace from a set of Namespaces. Equivalence of Namespace instances will be based
* on namespace URI and prefix only. The alwaysDeclare property will be ignored for
* purpose of equivalence.
*
* @param namespaces the set of namespaces
* @param oldNamespace the namespace to add to the set
*/
private void removeNamespace(Set namespaces, Namespace oldNamespace) {
if (oldNamespace == null) {
return;
}
Iterator iter = namespaces.iterator();
while (iter.hasNext()) {
Namespace namespace = iter.next();
if (DatatypeHelper.safeEquals(namespace.getNamespaceURI(), oldNamespace.getNamespaceURI()) &&
DatatypeHelper.safeEquals(namespace.getNamespacePrefix(), oldNamespace.getNamespacePrefix())) {
iter.remove();
}
}
}
/**
* Merge 2 or more Namespace collections into a single set, with equivalence semantics as described
* in {@link #addNamespace(Set, Namespace)}.
*
* @param namespaces list of Namespaces to merge
* @return the a new set of merged Namespaces
*/
private Set mergeNamespaceCollections(Collection ... namespaces) {
LazySet newNamespaces = new LazySet();
for (Collection nsCollection : namespaces) {
for (Namespace ns : nsCollection) {
if (ns != null) {
addNamespace(newNamespaces, ns);
}
}
}
return newNamespaces;
}
/**
* Get the set of namespaces which are currently visibly-used on the owning XMLObject (only the owner,
* not its children).
*
*
* Namespaces returned in the set are copied from the ones held in the manager. The
* alwaysDeclare property is not preserved.
*
*
* @return the set of visibly-used namespaces
*/
private Set getVisibleNamespaces() {
LazySet namespaces = new LazySet();
// Add namespace from element name.
if (getElementNameNamespace() != null) {
namespaces.add(copyNamespace(getElementNameNamespace()));
}
// Add xsi attribute prefix, if element carries an xsi:type.
if (getElementTypeNamespace() != null) {
namespaces.add(copyNamespace(XSI_NAMESPACE));
}
// Add namespaces from attribute names
for (Namespace attribName : attrNames) {
if (attribName != null) {
namespaces.add(copyNamespace(attribName));
}
}
return namespaces;
}
/**
* Get the set of non-visibly used namespaces used on the owning XMLObject (only the owner,
* not the owner's children).
*
*
* Namespaces returned in the set are copied from the ones held in the manager. The
* alwaysDeclare property is not preserved.
*
*
* @return the set of non-visibly-used namespaces
*/
private Set getNonVisibleNamespaceCandidates() {
LazySet namespaces = new LazySet();
// Add xsi:type value's prefix, if element carries an xsi:type
if (getElementTypeNamespace() != null) {
namespaces.add(copyNamespace(getElementTypeNamespace()));
}
// Add prefixes from attribute and content values
for (Namespace attribValue : attrValues.values()) {
if (attribValue != null) {
namespaces.add(copyNamespace(attribValue));
}
}
if (contentValue != null) {
namespaces.add(copyNamespace(contentValue));
}
return namespaces;
}
/**
* Get a copy of a Namespace. The alwaysDeclare property is not preserved.
*
* @param orig the namespace instance to copy
* @return a copy of the specified namespace
*/
private Namespace copyNamespace(Namespace orig) {
if (orig == null) {
return null;
} else {
return new Namespace(orig.getNamespaceURI(), orig.getNamespacePrefix());
}
}
/**
* Add the prefixes from a collection of namespaces to a set of prefixes. The
* value used to represent the default namespace will be normalized to {@link NamespaceManager#DEFAULT_NS_TOKEN}.
*
* @param prefixes the set of prefixes to which to add
* @param namespaces the source set of Namespaces
*/
private void addPrefixes(Set prefixes, Collection namespaces) {
for (Namespace ns : namespaces) {
String prefix = DatatypeHelper.safeTrimOrNullString(ns.getNamespacePrefix());
if (prefix == null) {
prefix = DEFAULT_NS_TOKEN;
}
prefixes.add(prefix);
}
}
/**
* Check whether the supplied QName contains non-empty namespace info and should
* be managed by the namespace manager.
*
* @param name the QName to check
* @return true if the QName contains non-empty namespace info and should be managed, false otherwise
*/
private boolean checkQName(QName name) {
return !DatatypeHelper.isEmpty(name.getNamespaceURI());
}
}
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