/*
* Copyright 2002-2010 the original author or authors.
*
* 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.springframework.util.xml;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import org.springframework.util.Assert;
/**
* Simple <code>javax.xml.namespace.NamespaceContext</code> implementation. Follows the standard
* <code>NamespaceContext</code> contract, and is loadable via a <code>java.util.Map</code> or
* <code>java.util.Properties</code> object
*
* @author Arjen Poutsma
* @since 3.0
*/
public class SimpleNamespaceContext implements NamespaceContext {
private Map<String, String> prefixToNamespaceUri = new HashMap<String, String>();
private Map<String, List<String>> namespaceUriToPrefixes = new HashMap<String, List<String>>();
private String defaultNamespaceUri = "";
public String getNamespaceURI(String prefix) {
Assert.notNull(prefix, "prefix is null");
if (XMLConstants.XML_NS_PREFIX.equals(prefix)) {
return XMLConstants.XML_NS_URI;
}
else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix)) {
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
}
else if (XMLConstants.DEFAULT_NS_PREFIX.equals(prefix)) {
return defaultNamespaceUri;
}
else if (prefixToNamespaceUri.containsKey(prefix)) {
return prefixToNamespaceUri.get(prefix);
}
return "";
}
public String getPrefix(String namespaceUri) {
List prefixes = getPrefixesInternal(namespaceUri);
return prefixes.isEmpty() ? null : (String) prefixes.get(0);
}
public Iterator getPrefixes(String namespaceUri) {
return getPrefixesInternal(namespaceUri).iterator();
}
/**
* Sets the bindings for this namespace context. The supplied map must consist of string key value pairs.
*
* @param bindings the bindings
*/
public void setBindings(Map<String, String> bindings) {
for (Map.Entry<String, String> entry : bindings.entrySet()) {
bindNamespaceUri(entry.getKey(), entry.getValue());
}
}
/**
* Binds the given namespace as default namespace.
*
* @param namespaceUri the namespace uri
*/
public void bindDefaultNamespaceUri(String namespaceUri) {
bindNamespaceUri(XMLConstants.DEFAULT_NS_PREFIX, namespaceUri);
}
/**
* Binds the given prefix to the given namespace.
*
* @param prefix the namespace prefix
* @param namespaceUri the namespace uri
*/
public void bindNamespaceUri(String prefix, String namespaceUri) {
Assert.notNull(prefix, "No prefix given");
Assert.notNull(namespaceUri, "No namespaceUri given");
if (XMLConstants.DEFAULT_NS_PREFIX.equals(prefix)) {
defaultNamespaceUri = namespaceUri;
}
else {
prefixToNamespaceUri.put(prefix, namespaceUri);
getPrefixesInternal(namespaceUri).add(prefix);
}
}
/** Removes all declared prefixes. */
public void clear() {
prefixToNamespaceUri.clear();
}
/**
* Returns all declared prefixes.
*
* @return the declared prefixes
*/
public Iterator<String> getBoundPrefixes() {
return prefixToNamespaceUri.keySet().iterator();
}
private List<String> getPrefixesInternal(String namespaceUri) {
if (defaultNamespaceUri.equals(namespaceUri)) {
return Collections.singletonList(XMLConstants.DEFAULT_NS_PREFIX);
}
else if (XMLConstants.XML_NS_URI.equals(namespaceUri)) {
return Collections.singletonList(XMLConstants.XML_NS_PREFIX);
}
else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(namespaceUri)) {
return Collections.singletonList(XMLConstants.XMLNS_ATTRIBUTE);
}
else {
List<String> list = namespaceUriToPrefixes.get(namespaceUri);
if (list == null) {
list = new ArrayList<String>();
namespaceUriToPrefixes.put(namespaceUri, list);
}
return list;
}
}
/**
* Removes the given prefix from this context.
*
* @param prefix the prefix to be removed
*/
public void removeBinding(String prefix) {
if (XMLConstants.DEFAULT_NS_PREFIX.equals(prefix)) {
defaultNamespaceUri = "";
}
else {
String namespaceUri = prefixToNamespaceUri.remove(prefix);
List prefixes = getPrefixesInternal(namespaceUri);
prefixes.remove(prefix);
}
}
}
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