source: trunk/EventBenchConsole/src/de/ugoe/cs/eventbench/windows/data/WindowsEvent.java

package de.ugoe.cs.eventbench.windows.data;

import java.io.ByteArrayInputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import de.ugoe.cs.eventbench.data.ReplayableEvent;

/**
 * <p>
 * Convenience class for working with Windows MFC events.
 * </p>
 * 
 * @author Steffen Herbold
 * @version 1.0
 */
public class WindowsEvent extends ReplayableEvent<WindowsMessage> {

        /**
         * <p>
         * Id for object serialization.
         * </p>
         */
        private static final long serialVersionUID = 1L;

        /**
         * <p>
         * Constructor. Creates a new WindowEvent.
         * </p>
         * 
         * @see de.ugoe.cs.eventbench.data.Event#Event(String)
         * @param type
         *            type of the event.
         */
        public WindowsEvent(String type) {
                super(type);
        }

        @Override
        protected boolean targetEquals(String otherTarget) {
                return MFCTargetComparator.compare(target, otherTarget);
        }
        
        int targetHash = 0;
        
        @Override
        protected int targetHashCode() {
                if( targetHash==0 ) {
                        int multiplier = 17;
                        if (target != null) {
                                Document doc;
                                try {
                                        DocumentBuilder documentBuilder = DocumentBuilderFactory
                                                        .newInstance().newDocumentBuilder();
                                        doc = documentBuilder.parse(new ByteArrayInputStream(
                                                        ("<dummy>" + target + "</dummy>").getBytes("UTF-8")));
                                } catch (Exception e) {
                                        e.printStackTrace();
                                        return 0;
                                }
                                doc.getDocumentElement().normalize();
                                NodeList widgets = doc.getElementsByTagName("window");

                                for (int i = 0; i < widgets.getLength(); i++) {
                                        Element currentWidget = (Element) widgets.item(i);
                                        targetHash = targetHash* multiplier + widgetHashCode(currentWidget);
                                }
                        }
                }
                return targetHash;
        }
        
        private int widgetHashCode(Element currentWidget) {
                int hashCode = 0;
                int multiplier = 41;
                hashCode = hashCode * multiplier + currentWidget.getAttribute("class").hashCode();
                hashCode = hashCode * multiplier + currentWidget.getAttribute("resourceId").hashCode();
                hashCode = hashCode * multiplier + currentWidget.getAttribute("isModal").hashCode();
                return hashCode;
        }
}