/*
* Copyright (c) 2002-2010 Gargoyle Software 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 com.gargoylesoftware.htmlunit.html.xpath;
import java.util.Map;
import org.apache.xml.utils.PrefixResolverDefault;
import org.w3c.dom.Node;
import com.gargoylesoftware.htmlunit.html.DomAttr;
import com.gargoylesoftware.htmlunit.html.DomElement;
import com.gargoylesoftware.htmlunit.html.DomNode;
import com.gargoylesoftware.htmlunit.xml.XmlPage;
/**
* Custom {@link PrefixResolverDefault} extension.
*
* @version $Revision: 5301 $
* @author Ahmed Ashour
*/
final class HtmlUnitPrefixResolver extends PrefixResolverDefault {
/**
* Creates a new instance.
* @param xpathExpressionContext the context from which XPath expression prefixes will be resolved
*/
HtmlUnitPrefixResolver(final Node xpathExpressionContext) {
super(xpathExpressionContext);
}
/**
* {@inheritDoc}
*/
@Override
public String getNamespaceForPrefix(final String prefix, final Node namespaceContext) {
String namespace = super.getNamespaceForPrefix(prefix, namespaceContext);
if (namespace == null) {
if (namespaceContext instanceof XmlPage) {
final DomElement documentElement = ((XmlPage) namespaceContext).getDocumentElement();
if (documentElement != null) {
namespace = getNamespace(documentElement, prefix);
}
}
else if (namespaceContext instanceof DomElement) {
namespace = getNamespace((DomElement) namespaceContext, prefix);
}
}
return namespace;
}
private String getNamespace(final DomElement element, final String prefix) {
final Map<String, DomAttr> attributes = element.getAttributesMap();
for (final String name : attributes.keySet()) {
if (name.startsWith("xmlns:")) {
if (name.substring("xmlns:".length()).equals(prefix)) {
return attributes.get(name).getValue();
}
}
}
for (final DomNode child : element.getChildren()) {
if (child instanceof DomElement) {
final String namespace = getNamespace((DomElement) child, prefix);
if (namespace != null) {
return namespace;
}
}
}
return null;
}
}