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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 nokogiri.internals.c14n;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
/**
* Temporary swapped static functions from the normalizer Section
*
* @author Christian Geuer-Pollmann
*/
public class C14nHelper
{
/**
* Constructor C14nHelper
*
*/
private
C14nHelper()
{
// don't allow instantiation
}
/**
* Method namespaceIsRelative
*
* @param namespace
* @return true if the given namespace is relative.
*/
public static boolean
namespaceIsRelative(Attr namespace)
{
return !namespaceIsAbsolute(namespace);
}
/**
* Method namespaceIsRelative
*
* @param namespaceValue
* @return true if the given namespace is relative.
*/
public static boolean
namespaceIsRelative(String namespaceValue)
{
return !namespaceIsAbsolute(namespaceValue);
}
/**
* Method namespaceIsAbsolute
*
* @param namespace
* @return true if the given namespace is absolute.
*/
public static boolean
namespaceIsAbsolute(Attr namespace)
{
return namespaceIsAbsolute(namespace.getValue());
}
/**
* Method namespaceIsAbsolute
*
* @param namespaceValue
* @return true if the given namespace is absolute.
*/
public static boolean
namespaceIsAbsolute(String namespaceValue)
{
// assume empty namespaces are absolute
if (namespaceValue.length() == 0) {
return true;
}
return namespaceValue.indexOf(':') > 0;
}
/**
* This method throws an exception if the Attribute value contains
* a relative URI.
*
* @param attr
* @throws CanonicalizationException
*/
public static void
assertNotRelativeNS(Attr attr) throws CanonicalizationException
{
if (attr == null) {
return;
}
String nodeAttrName = attr.getNodeName();
boolean definesDefaultNS = nodeAttrName.equals("xmlns");
boolean definesNonDefaultNS = nodeAttrName.startsWith("xmlns:");
if ((definesDefaultNS || definesNonDefaultNS) && namespaceIsRelative(attr)) {
String parentName = attr.getOwnerElement().getTagName();
String attrValue = attr.getValue();
Object exArgs[] = { parentName, nodeAttrName, attrValue };
throw new CanonicalizationException(
"c14n.Canonicalizer.RelativeNamespace", exArgs
);
}
}
/**
* This method throws a CanonicalizationException if the supplied Document
* is not able to be traversed using a TreeWalker.
*
* @param document
* @throws CanonicalizationException
*/
public static void
checkTraversability(Document document)
throws CanonicalizationException
{
if (!document.isSupported("Traversal", "2.0")) {
Object exArgs[] = {document.getImplementation().getClass().getName() };
throw new CanonicalizationException(
"c14n.Canonicalizer.TraversalNotSupported", exArgs
);
}
}
/**
* This method throws a CanonicalizationException if the supplied Element
* contains any relative namespaces.
*
* @param ctxNode
* @throws CanonicalizationException
* @see C14nHelper#assertNotRelativeNS(Attr)
*/
public static void
checkForRelativeNamespace(Element ctxNode)
throws CanonicalizationException
{
if (ctxNode != null) {
NamedNodeMap attributes = ctxNode.getAttributes();
for (int i = 0; i < attributes.getLength(); i++) {
C14nHelper.assertNotRelativeNS((Attr) attributes.item(i));
}
} else {
throw new CanonicalizationException("Called checkForRelativeNamespace() on null");
}
}
public static String
getErrorMessage(String message, Object... exArgs)
{
StringBuffer sb = new StringBuffer(message);
for (Object arg : exArgs) {
sb.append(", ").append(arg.toString());
}
return new String(sb);
}
}
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