| /* |
| * 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.jackrabbit.vault.util.xml.serialize; |
| |
| import java.util.Comparator; |
| |
| import org.apache.jackrabbit.vault.util.xml.xerces.util.XMLSymbols; |
| |
| public class AttributeNameComparator implements Comparator<String> { |
| |
| public static final AttributeNameComparator INSTANCE = new AttributeNameComparator(); |
| |
| @Override |
| public int compare(final String o1, final String o2) { |
| final String n1 = o1.toLowerCase(); |
| final String n2 = o2.toLowerCase(); |
| // order xmlns(:<prefix>)? attributes always to the front |
| final boolean isXmlNs1 = n1.startsWith(XMLSymbols.PREFIX_XMLNS); |
| final boolean isXmlNs2 = n2.startsWith(XMLSymbols.PREFIX_XMLNS); |
| if (isXmlNs1 && !isXmlNs2) { |
| return -1; |
| } else if (!isXmlNs1 && isXmlNs2) { |
| return 1; |
| } |
| final int i1 = n1.indexOf(':'); |
| final int i2 = n2.indexOf(':'); |
| if (i1 >=0 && i2 < 0) { |
| return -1; |
| } else if (i1 < 0 && i2 >=0) { |
| return 1; |
| } else { |
| // if the lowercase versions are equal, they could differ in case (see JCRVLT-334) |
| final int c = n1.compareTo(n2); |
| if (c == 0) { |
| return o1.compareTo(o2); |
| } |
| return c; |
| } |
| } |
| } |