| /** |
| * 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 org.apache.xml.security.c14n.helper; |
| |
| import org.apache.xml.security.utils.Constants; |
| import org.w3c.dom.Attr; |
| import java.io.Serializable; |
| import java.util.Comparator; |
| |
| /** |
| * 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> |
| * |
| */ |
| public class AttrCompare implements Comparator<Attr>, Serializable { |
| |
| private static final long serialVersionUID = -7113259629930576230L; |
| private static final int ATTR0_BEFORE_ATTR1 = -1; |
| private static final int ATTR1_BEFORE_ATTR0 = 1; |
| private static final 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 attr0 |
| * @param attr1 |
| * @return returns a negative integer, zero, or a positive integer as |
| * obj0 is less than, equal to, or greater than obj1 |
| * |
| */ |
| public int compare(Attr attr0, Attr attr1) { |
| 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 ("xmlns".equals(localname0)) { |
| localname0 = ""; |
| } |
| |
| if ("xmlns".equals(localname1)) { |
| localname1 = ""; |
| } |
| |
| return localname0.compareTo(localname1); |
| } |
| // attr0 is a namespace, attr1 is not |
| return ATTR0_BEFORE_ATTR1; |
| } else if (isNamespaceAttr1) { |
| // attr1 is a namespace, attr0 is not |
| return ATTR1_BEFORE_ATTR0; |
| } |
| |
| // none is a namespace |
| if (namespaceURI0 == null) { |
| if (namespaceURI1 == null) { |
| String name0 = attr0.getName(); |
| String name1 = attr1.getName(); |
| return name0.compareTo(name1); |
| } |
| return ATTR0_BEFORE_ATTR1; |
| } else if (namespaceURI1 == null) { |
| return ATTR1_BEFORE_ATTR0; |
| } |
| |
| int a = namespaceURI0.compareTo(namespaceURI1); |
| if (a != 0) { |
| return a; |
| } |
| |
| return attr0.getLocalName().compareTo(attr1.getLocalName()); |
| } |
| } |