/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* 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.sun.org.apache.xml.internal.security.c14n.helper;
import com.sun.org.apache.xml.internal.security.utils.Constants;
import org.w3c.dom.Attr;
/**
* Compares two attributes based on the C14n specification.
*
* <UL>
* <LI>Namespace nodes have a lesser document order position than attribute nodes.
* <LI> An element's namespace nodes are sorted lexicographically by
* local name (the default namespace node, if one exists, has no
* local name and is therefore lexicographically least).
* <LI> An element's attribute nodes are sorted lexicographically with
* namespace URI as the primary key and local name as the secondary
* key (an empty namespace URI is lexicographically least).
* </UL>
*
* $todo$ Should we implement java.util.Comparator and import java.util.Arrays to use Arrays.sort(intarray);
* @author Christian Geuer-Pollmann
*/
public class AttrCompare implements java.util.Comparator {
private final int ATTR0_BEFORE_ATTR1 = -1;
private final int ATTR1_BEFORE_ATTR0 = 1;
private final static String XMLNS=Constants.NamespaceSpecNS;
/**
* Compares two attributes based on the C14n specification.
*
* <UL>
* <LI>Namespace nodes have a lesser document order position than attribute nodes.
* <LI> An element's namespace nodes are sorted lexicographically by
* local name (the default namespace node, if one exists, has no
* local name and is therefore lexicographically least).
* <LI> An element's attribute nodes are sorted lexicographically with
* namespace URI as the primary key and local name as the secondary
* key (an empty namespace URI is lexicographically least).
* </UL>
*
* @param obj0 casted Attr
* @param obj1 casted Attr
* @return returns a negative integer, zero, or a positive integer as obj0 is less than, equal to, or greater than obj1
*
*/
public int compare(Object obj0, Object obj1) {
Attr attr0 = (Attr) obj0;
Attr attr1 = (Attr) obj1;
String namespaceURI0 = attr0.getNamespaceURI();
String namespaceURI1 = attr1.getNamespaceURI();
boolean isNamespaceAttr0 =
XMLNS.equals(namespaceURI0);
boolean isNamespaceAttr1 =
XMLNS.equals(namespaceURI1);
if (isNamespaceAttr0) {
if (isNamespaceAttr1) {
// both are namespaces
String localname0 = attr0.getLocalName();
String localname1 = attr1.getLocalName();
if (localname0.equals("xmlns")) {
localname0 = "";
}
if (localname1.equals("xmlns")) {
localname1 = "";
}
return localname0.compareTo(localname1);
}
// attr0 is a namespace, attr1 is not
return ATTR0_BEFORE_ATTR1;
}
if (isNamespaceAttr1) {
// attr1 is a namespace, attr0 is not
return ATTR1_BEFORE_ATTR0;
}
// none is a namespae
if (namespaceURI0 == null) {
if (namespaceURI1 == null) {
/*
String localName0 = attr0.getLocalName();
String localName1 = attr1.getLocalName();
return localName0.compareTo(localName1);
*/
String name0 = attr0.getName();
String name1 = attr1.getName();
return name0.compareTo(name1);
}
return ATTR0_BEFORE_ATTR1;
}
if (namespaceURI1 == null) {
return ATTR1_BEFORE_ATTR0;
}
int a = namespaceURI0.compareTo(namespaceURI1);
if (a != 0) {
return a;
}
/*
String localName0 = ;
String localName1 =;*/
return (attr0.getLocalName())
.compareTo( attr1.getLocalName());
}
}