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/*
* $Id: SimpleNamespaceContext.java,v 1.7 2004/07/14 13:23:54 cniles Exp $
*
* Copyright (c) 2004, Christian Niles, unit12.net
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of Christian Niles, Unit12, nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR 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.
*
*/
package javanet.staxutils;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
/**
* Simple NamespaceContext implementation backed by a HashMap.
*
* @author Christian Niles
* @version $Revision: 1.7 $
*/
public class SimpleNamespaceContext
implements
ExtendedNamespaceContext,
StaticNamespaceContext {
/**
* The parent context, which may be null
*/
protected NamespaceContext parent;
/**
* map containing bound namespaces, keyed by their prefix. A LinkedHashMap
* is used to ensure that {@link #getPrefix(String)} always returns the same
* prefix, unless that prefix is removed.
*/
protected Map namespaces = new LinkedHashMap();
/**
* Constructs a SimpleNamespaceContext with no parent context or namespace
* declarations.
*/
public SimpleNamespaceContext() {
}
/**
* Constructs a SimpleNamespaceContext with no parent context that contains
* the specified prefixes.
*
* @param namespaces A Map of namespace URIs, keyed by their prefixes.
*/
public SimpleNamespaceContext(Map namespaces) {
if (namespaces != null) {
this.namespaces.putAll(namespaces);
}
}
/**
* Constructs an empty SimpleNamespaceContext with the given parent. The
* parent context will be forwarded any requests for namespaces not declared
* in this context.
*
* @param parent The parent context.
*/
public SimpleNamespaceContext(NamespaceContext parent) {
this.parent = parent;
}
/**
* Constructs an empty SimpleNamespaceContext with the given parent. The
* parent context will be forwarded any requests for namespaces not declared
* in this context.
*
* @param parent The parent context.
* @param namespaces A Map of namespace URIs, keyed by their prefixes.
*/
public SimpleNamespaceContext(NamespaceContext parent, Map namespaces) {
this.parent = parent;
if (namespaces != null) {
this.namespaces.putAll(namespaces);
}
}
/**
* Returns a reference to the parent of this context.
*
* @return The parent context, or null if this is a root
* context.
*/
public NamespaceContext getParent() {
return parent;
}
/**
* Sets the parent context used to inherit namespace bindings.
*
* @param parent The new parent context.
*/
public void setParent(NamespaceContext parent) {
this.parent = parent;
}
/**
* Determines if this is a root context.
*
* @return true if this is a root context, false
* otherwise.
*/
public boolean isRootContext() {
return parent == null;
}
public String getNamespaceURI(String prefix) {
if (prefix == null) {
throw new IllegalArgumentException("prefix argument was null");
} else if (prefix.equals(XMLConstants.XML_NS_PREFIX)) {
return XMLConstants.XML_NS_URI;
} else if (prefix.equals(XMLConstants.XMLNS_ATTRIBUTE)) {
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
} else if (namespaces.containsKey(prefix)) {
// The StAX spec says to return null for any undefined prefix. To support
// undefining a prefix as specified in the Namespaces spec, we store
// undefined prefixes as the empty string.
String uri = (String) namespaces.get(prefix);
if (uri.length() == 0) {
return null;
} else {
return uri;
}
} else if (parent != null) {
return parent.getNamespaceURI(prefix);
} else {
return null;
}
}
public String getPrefix(String nsURI) {
if (nsURI == null) {
throw new IllegalArgumentException("nsURI was null");
} else if (nsURI.length() == 0) {
throw new IllegalArgumentException("nsURI was empty");
} else if (nsURI.equals(XMLConstants.XML_NS_URI)) {
return XMLConstants.XML_NS_PREFIX;
} else if (nsURI.equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI)) {
return XMLConstants.XMLNS_ATTRIBUTE;
}
Iterator iter = namespaces.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
String uri = (String) entry.getValue();
if (uri.equals(nsURI)) {
return (String) entry.getKey();
}
}
if (parent != null) {
return parent.getPrefix(nsURI);
} else if (nsURI.length() == 0) {
return "";
} else {
return null;
}
}
/**
* Determines if the specified prefix is declared within this context,
* irrespective of any ancestor contexts.
*
* @param prefix The prefix to check.
* @return true if the prefix is declared in this context,
* false otherwise.
*/
public boolean isPrefixDeclared(String prefix) {
return namespaces.containsKey(prefix);
}
public Iterator getDeclaredPrefixes() {
return Collections.unmodifiableCollection(this.namespaces.keySet())
.iterator();
}
/**
* Returns the number of namespace prefixes declared in this context.
*
* @return The number of namespace prefixes declared in this context.
*/
public int getDeclaredPrefixCount() {
return namespaces.size();
}
public Iterator getPrefixes() {
if (parent == null || !(parent instanceof ExtendedNamespaceContext)) {
return getDeclaredPrefixes();
} else {
Set prefixes = new HashSet(this.namespaces.keySet());
ExtendedNamespaceContext superCtx = (ExtendedNamespaceContext) parent;
for (Iterator i = superCtx.getPrefixes(); i.hasNext();) {
String prefix = (String) i.next();
prefixes.add(prefix);
}
return prefixes.iterator();
}
}
public Iterator getPrefixes(String nsURI) {
if (nsURI == null) {
throw new IllegalArgumentException("nsURI was null");
} else if (nsURI.equals(XMLConstants.XML_NS_URI)) {
return Collections.singleton(XMLConstants.XML_NS_PREFIX).iterator();
} else if (nsURI.equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI)) {
return Collections.singleton(XMLConstants.XMLNS_ATTRIBUTE)
.iterator();
}
Set prefixes = null;
Iterator iter = namespaces.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
String uri = (String) entry.getValue();
if (uri.equals(nsURI)) {
if (prefixes == null) {
prefixes = new HashSet();
}
prefixes.add(entry.getKey());
}
}
if (parent != null) {
for (Iterator i = parent.getPrefixes(nsURI); i.hasNext();) {
String prefix = (String) i.next();
if (prefixes == null) {
prefixes = new HashSet();
}
prefixes.add(prefix);
}
}
if (prefixes != null) {
return Collections.unmodifiableSet(prefixes).iterator();
} else if (nsURI.length() == 0) {
return Collections.singleton("").iterator();
} else {
return Collections.EMPTY_LIST.iterator();
}
}
/**
* Sets the default namespace in this context.
*
* @param nsURI The default namespace URI.
* @return The previously declared namespace uri, or null if
* the default prefix wasn't previously declared in this context.
*/
public String setDefaultNamespace(String nsURI) {
if (nsURI != null) {
if (nsURI.equals(XMLConstants.XML_NS_URI)) {
throw new IllegalArgumentException("Attempt to map 'xml' uri");
} else if (nsURI.equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI)) {
throw new IllegalArgumentException("Attempt to map 'xmlns' uri");
}
return (String) namespaces.put(XMLConstants.DEFAULT_NS_PREFIX,
nsURI);
} else {
// put the empty string to record an undefined prefix
return (String) namespaces.put(XMLConstants.DEFAULT_NS_PREFIX, "");
}
}
/**
* Declares a namespace binding in this context.
*
* @param prefix The namespace prefix.
* @param nsURI The namespace URI.
* @return The previously declared namespace uri, or null if
* the prefix wasn't previously declared in this context.
*/
public String setPrefix(String prefix, String nsURI) {
if (prefix == null) {
throw new NullPointerException("Namespace Prefix was null");
} else if (prefix.equals(XMLConstants.DEFAULT_NS_PREFIX)) {
return setDefaultNamespace(nsURI);
} else if (prefix.equals(XMLConstants.XML_NS_PREFIX)) {
throw new IllegalArgumentException("Attempt to map 'xml' prefix");
} else if (prefix.equals(XMLConstants.XMLNS_ATTRIBUTE)) {
throw new IllegalArgumentException("Attempt to map 'xmlns' prefix");
} else if (nsURI != null) {
if (nsURI.equals(XMLConstants.XML_NS_URI)) {
throw new IllegalArgumentException("Attempt to map 'xml' uri");
} else if (nsURI.equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI)) {
throw new IllegalArgumentException("Attempt to map 'xmlns' uri");
} else {
return (String) namespaces.put(prefix, nsURI);
}
} else {
// put the empty string to record an undefined prefix
return (String) namespaces.put(prefix, "");
}
}
}
