source: trunk/EventBenchConsole/src/de/ugoe/cs/eventbench/jfc/data/JFCEvent.java

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

import java.util.HashMap;
import java.util.Map;

import de.ugoe.cs.eventbench.data.IReplayable;
import de.ugoe.cs.eventbench.data.ReplayableEvent;
import de.ugoe.cs.eventbench.jfc.JFCLogParser;

/**
 * <p>
 * This class defines JFC events.
 * </p>
 * 
 * @author Steffen Herbold
 * @version 1.0
 */
public class JFCEvent extends ReplayableEvent<IReplayable> {

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

        /**
         * <p>
         * Internal map of parameters associated with the event.
         * </p>
         */
        private Map<String, String> parameters;

        /**
         * <p>
         * Information about the event source.
         * </p>
         */
        private Map<String, String> sourceParameters;

        /**
         * <p>
         * Information about the parent of the event source.
         * </p>
         */
        private Map<String, String> parentParameters;
        
        private boolean targetChanged = false;
        
        private int targetHash = -1;

        /**
         * <p>
         * Constructor. Creates a new JFCEvent.
         * </p>
         * 
         * @param type
         *            type of the event
         */
        public JFCEvent(String type) {
                super(type);
                parameters = new HashMap<String, String>();
                sourceParameters = new HashMap<String, String>();
                parentParameters = new HashMap<String, String>();
        }

        /**
         * <p>
         * Adds a new parameter to the event.
         * </p>
         * 
         * @param name
         *            name of the parameter
         * @param value
         *            value of the parameter
         */
        public void addParameter(String name, String value) {
                parameters.put(name, value);
        }

        /**
         * <p>
         * Retrieves the value of a parameter.
         * </p>
         * 
         * @param name
         *            name of the parameter
         * @return value of the parameter
         */
        public String getParameter(String name) {
                return parameters.get(name);
        }

        /**
         * <p>
         * Adds new information about the source of the event.
         * </p>
         * 
         * @param name
         *            name of the information
         * @param value
         *            value of the information
         */
        public void addSourceInformation(String name, String value) {
                sourceParameters.put(name, value);
        }

        /**
         * <p>
         * Retrieves information about the source of the event.
         * </p>
         * 
         * @param name
         *            name of the information
         * @return value of the information
         */
        public String getSourceInformation(String name) {
                return sourceParameters.get(name);
        }

        /**
         * <p>
         * Adds new information about the parent of the source of the event.
         * </p>
         * 
         * @param name
         *            name of the information
         * @param value
         *            value of the information
         */
        public void addParentInformation(String name, String value) {
                parentParameters.put(name, value);
        }

        /**
         * <p>
         * Used by the {@link JFCLogParser} to extend the target string of the
         * current event with a further ancestor. The resulting target string will
         * have the structure {@code etc.grandparent.parent.eventtarget}.
         * </p>
         * 
         * @param extension
         *            extension for the target.
         */
        public void extendTarget(String extension) {
                if (target == null || "".equals(target)) {
                        target = extension;
                } else {
                        target += "." + extension;
                }
                targetChanged = true;
        }

        /**
         * <p>
         * Retrieves information about the parent of the source of the event.
         * </p>
         * 
         * @param name
         *            name of the information
         * @return value of the information
         */
        public String getParentInformation(String name) {
                return parentParameters.get(name);
        }

        /**
         * <p>
         * This method implements the comparison between two targets of JFCEvents.
         * The targets are equal, if they have the same placement in the widget
         * hierarchy, i.e., the target strings describe the same widgets, according
         * to the implementation of widget equality provided by
         * {@link #compareWidgets(String, String)}.
         * </p>
         * 
         * @see de.ugoe.cs.eventbench.data.Event#targetEquals(java.lang.String)
         */
        @Override
        protected boolean targetEquals(String otherTarget) {
                return JFCTargetComparator.compare(target, otherTarget);
        }

        /**
         * <p>
         * The targetHashCode ignores the parts of the target that describe the
         * title and hash of a widget, to ensure that the equals/hashCode contract
         * is fulfilled.
         * </p>
         * 
         * @see de.ugoe.cs.eventbench.data.Event#targetHashCode()
         */
        @Override
        protected int targetHashCode() {
                if( targetChanged || targetHash==-1 ) {
                        targetHash = 0;
                        int multiplier = 29;
                        if (target != null) {
                                String[] targetParts = target.split("\\]\\.\\[");
                                if (targetParts.length == 0) {
                                        targetHash = widgetHashCode(target);
                                } else {
                                        for (String widgetString : targetParts) {
                                                targetHash = targetHash * multiplier
                                                                + widgetHashCode(widgetString);
                                        }
                                }
                        }
                        targetChanged = false;
                }
                return targetHash;
        }

        /**
         * <p>
         * This method calculates the hashCode for a a widget. If is used by
         * {@link #targetHashCode()} to build the complete hashCode.
         * </p>
         * 
         * @param widget
         *            string describing the widget
         * @return hashCode of the widget
         */
        private int widgetHashCode(String widget) {
                int hashCode = 0;
                int multiplier = 37;
                String[] widgetInfo = widget.split("','");
                if (widgetInfo.length == 5) {
                        hashCode = hashCode * multiplier + widgetInfo[1].hashCode();
                        hashCode = hashCode * multiplier + widgetInfo[2].hashCode();
                        //hashCode = hashCode * multiplier + widgetInfo[3].hashCode();
                }
                return hashCode;
        }

}