ParameterListHandler.java

package com.owera.xaps.tr069.xml;

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

import com.owera.xaps.tr069.xml.ParameterValueStruct;

/**
 * The class is responsible for parsing the ParameterList entity and populating the 
 * ParameterList which is a list of ParameterValueStruct or ParameterInfoStruct objects 
 * (which depends on the RPC method performed).
 * 
 *   
 * @author knut petter
 * 
 */

public class ParameterListHandler extends DefaultHandler {

	private enum ParameterType {
		VALUE, INFO, ATTRIBUTE;
	}

	public static final String PARAMETER_LIST_TAG = "ParameterList";
	public static final String PARAMETER_VALUE_STRUCT_TAG = "ParameterValueStruct";
	public static final String PARAMETER_INFO_STRUCT_TAG = "ParameterInfoStruct";
	public static final String PARAMETER_ATTRIBUTE_STRUCT_TAG = "ParameterAttributeStruct";
	public static final String NAME_TAG = "Name";
	public static final String VALUE_TAG = "Value";
	public static final String WRITABLE_TAG = "Writable";
	public static final String NOTIFICATION_TAG = "Notification";

	private Parser owner;
	private ParameterList params;
	private ParameterValueStruct pvs;
	private ParameterInfoStruct pis;
	private ParameterAttributeStruct pas;
	private StringBuilder currTextContent = new StringBuilder();

	private ParameterType parameterType = null;

	public ParameterListHandler(ParameterList params, Parser owner) {
		this.owner = owner;
		this.params = params;
	}

	public void startElement(String namespaceURI, String localName, String qualifiedName, Attributes attributes) throws SAXException {
		currTextContent = new StringBuilder();
		if (PARAMETER_VALUE_STRUCT_TAG.equals(localName)) {
			parameterType = ParameterType.VALUE;
			pvs = new ParameterValueStruct();
		} else if (PARAMETER_INFO_STRUCT_TAG.equals(localName)) {
			parameterType = ParameterType.INFO;
			pis = new ParameterInfoStruct();
		} else if (PARAMETER_ATTRIBUTE_STRUCT_TAG.equals(localName)) {
			parameterType = ParameterType.ATTRIBUTE;
			pas = new ParameterAttributeStruct();
		} else if (VALUE_TAG.equals(localName) && pvs != null && attributes != null) {
			for (int i = 0; i < attributes.getLength(); i++) {
				if (attributes.getQName(i).indexOf(":type") > -1) {
					pvs.setType(attributes.getValue(i));
					break;
				}
			}
		}
	}

	public void endElement(String namespaceURI, String localName, String qualifiedName) throws SAXException {
		if (PARAMETER_LIST_TAG.equals(localName)) {
			owner.getXMLReader().setContentHandler(owner);
		} else if (PARAMETER_VALUE_STRUCT_TAG.equals(localName)) {
			this.params.addParameterValueStruct(pvs);
		} else if (PARAMETER_INFO_STRUCT_TAG.equals(localName)) {
			this.params.addParameterInfoStruct(pis);
		} else if (PARAMETER_ATTRIBUTE_STRUCT_TAG.equals(localName)) {
			this.params.addParameterAttributeStruct(pas);
		} else if (NAME_TAG.equals(localName)) {
			if (parameterType == ParameterType.VALUE) {
				pvs.setName(new String(currTextContent));
			} else if (parameterType == ParameterType.INFO) {
				pis.setName(new String(currTextContent));
			} else if (parameterType == ParameterType.ATTRIBUTE) {
				pas.setName(new String(currTextContent));
			}
		} else if (VALUE_TAG.equals(localName)) {
			pvs.setValue(new String(currTextContent));
		} else if (WRITABLE_TAG.equals(localName)) {
			String ct = new String(currTextContent);
			pis.setWritable((ct.equals("0") || ct.equals("false")) ? false : true);
		} else if (NOTIFICATION_TAG.equals(localName)) {
			String ct = new String(currTextContent);
			try {
				pas.setNotifcation(Integer.parseInt(ct));
			} catch (NumberFormatException nfe) {
				throw new SAXException("The notification was not a number (" + ct + ")");
			}
		}
	}

	public void characters(char[] ch, int start, int length) throws SAXException {
		String content = String.valueOf(ch).substring(start, (start + length));
		currTextContent.append(content.trim());
	}
}