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This library leverage method chaining. It is not compliant with the Java XML Standard API. It contains a serializer compatible with Microsoft XmlSerializer input/output XML format. It contains another serializer that is compatible with the DataContractSerializer from Microsoft. Along with the basic soap package provided, it becomes easy to do raw SOAP calls to any SOAP Web service. The XmlDocument class also offer XPath like methods to fetch information from the underlying XML tree.

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/****************************************************************************
 * Copyright 2009-2015 Jean-Philippe Gravel, P. Eng. CSDP
 * 
 * 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.formix.dsx;

import java.util.Stack;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.ext.DefaultHandler2;

class XmlHandler extends DefaultHandler2 {

	private XmlContentListener listener;
	private XmlElement rootElement;
	private Stack elementStack;
	private String currentCDATA;

	public XmlHandler() {
		this(new XmlContentAdapter());
	}

	public XmlHandler(XmlContentListener listener) {
		this.listener = listener;
		this.rootElement = null;
		this.elementStack = new Stack();
		this.currentCDATA = null;
	}

	public XmlElement getRootElement() {
		return rootElement;
	}

	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		XmlElement newElement = new XmlElement(qName);
		for (int i = 0; i < attributes.getLength(); i++) {
			String name = attributes.getQName(i);
			String value = attributes.getValue(i);
			newElement.setAttribute(name, value);
		}
		this.elementStack.add(newElement);
		this.listener.elementCreated(newElement);
	}

	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		XmlElement child = this.elementStack.pop();
		this.mergeTextChilds(child);
		if (this.elementStack.size() > 0)
			this.elementStack.peek().addChild(child);
		else
			this.rootElement = child;
	}

	private void mergeTextChilds(XmlElement elem) {
		for (int i = 0; i < (elem.getChilds().size() - 1); i++) {
			XmlContent c1 = elem.getChild(i);
			XmlContent c2 = elem.getChild(i + 1);
			if (this.mergeText(c1, c2)) {
				elem.getChilds().remove(i + 1); // remove c2
				i--;
			}
		}
	}

	private boolean mergeText(XmlContent c1, XmlContent c2) {
		if ((c1 instanceof XmlText) && (c2 instanceof XmlText)
				&& (c1.getClass().equals(c2.getClass()))) {
			XmlText text2 = (XmlText) c2;
			((XmlText) c1).append(text2.getText());
			return true;
		}
		return false;
	}

	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {

		// TODO we should handle the case where more than 16KB is received and
		// the Text element is splitted in many XmlText
		// We found out that case when receiving base64 files
		// 43,224 bytes were split in 3 XmlText

		String str = new String(ch, start, length);
		if (this.currentCDATA == null) {
			XmlText text = this.elementStack.peek().addText(str);
			this.listener.textCreated(text);
		} else {
			this.currentCDATA += new String(str);
		}
	}

	@Override
	public void comment(char[] ch, int start, int length) throws SAXException {
		String comment = new String(ch, start, length);
		if (!this.elementStack.isEmpty()) {
			XmlComment cmt = this.elementStack.peek().addComment(comment);
			this.listener.commentCreated(cmt);
		}
	}

	@Override
	public void startCDATA() throws SAXException {
		this.currentCDATA = "";
	}

	@Override
	public void endCDATA() throws SAXException {
		XmlCDATA cdata = this.elementStack.peek().addCDATA(this.currentCDATA);
		this.listener.cdataCreated(cdata);
		this.currentCDATA = null;
	}

	public XmlElement peekTopElement() {
		if (this.elementStack.size() == 0) {
			return null;
		}
		return this.elementStack.peek();
	}
}