org.apache.ws.commons.serialize.OrderedAttributeXMLWriter Maven / Gradle / Ivy

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This is a small collection of utility classes, that allow high performance XML processing based on SAX. Basically, it is assumed, that you are using an JAXP 1.1 compliant XML parser and nothing else. In particular, no dependency on the javax.xml.transform package is introduced.

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/*
 * Copyright 2003, 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 org.apache.ws.commons.serialize;

import java.util.Arrays;
import java.util.Comparator;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;


/** A subclass of {@link org.apache.ws.commons.serialize.XMLWriterImpl},
 * which writes the attributes ordered alphabetically. This is mainly
 * useful for test purposes, when a canonical representation of the
 * result is required for comparing against an expected value.
 */
public class OrderedAttributeXMLWriter extends XMLWriterImpl {
    public void startElement(String pNamespaceURI, String pLocalName,
                             String pQName, final Attributes pAttrs)
            throws SAXException {
        Integer[] attributeNumbers = new Integer[pAttrs.getLength()];
        for (int i = 0;  i < attributeNumbers.length;  i++) {
        	attributeNumbers[i] = new Integer(i);
        }
        Arrays.sort(attributeNumbers, new Comparator(){
			public int compare(Object pNum1, Object pNum2) {
                int i1 = ((Integer) pNum1).intValue();
                int i2 = ((Integer) pNum2).intValue();
                String uri1 = pAttrs.getURI(i1);
                if (uri1 == null) {
                	uri1 = "";
                }
                String uri2 = pAttrs.getURI(i2);
                if (uri2 == null) {
                	uri2 = "";
                }
                int result = uri1.compareTo(uri2);
                if (result == 0) {
                	result = pAttrs.getLocalName(i1).compareTo(pAttrs.getLocalName(i2));
                }
                return result;
			}
        });
        AttributesImpl orderedAttributes = new AttributesImpl();
        for (int i = 0;  i < attributeNumbers.length;  i++) {
        	int num = attributeNumbers[i].intValue();
            orderedAttributes.addAttribute(pAttrs.getURI(num), pAttrs.getLocalName(num),
                                           pAttrs.getQName(num), pAttrs.getType(num),
                                           pAttrs.getValue(num));
        }
        super.startElement(pNamespaceURI, pLocalName, pQName, orderedAttributes);
    }
}