source: trunk/quest-plugin-jfc/src/main/java/de/ugoe/cs/quest/plugin/jfc/JFCReplayIDCalculator.java @ 796

package de.ugoe.cs.quest.plugin.jfc;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import de.ugoe.cs.quest.eventcore.Event;
import de.ugoe.cs.quest.eventcore.IEventTarget;
import de.ugoe.cs.quest.plugin.jfc.guimodel.JFCGUIElement;
import de.ugoe.cs.quest.plugin.jfc.guimodel.JFCGUIElementSpec;


/**
 * <p>
 * This class provides the functionality to calculate the unique GUITAR replayIDs
 * for {@link JFCEvent}s. This code is mainly based on guitar source code: edu.umd.cs.guitar.
 * model.JFCDefaultIDGeneratorSimple
 *    
 * </p>
 * @author fabian.glaser
 *
 */

public class JFCReplayIDCalculator {
        
        static final int prime = 31;
        
        /**
         * Properties that are used to identify widgets
         */
        private static List<String> ID_PROPERTIES = Arrays.asList(
                        "Class","Title","Icon");
        
   /**
    * Those classes are invisible widgets but cause false-positive when
    * calculating ID (compare guitar source code: edu.umd.cs.guitar.
    * model.JFCDefaultIDGeneratorSimple)
    */
   private static List<String> IGNORED_CLASSES = Arrays.asList("javax.swing.JPanel",
         "javax.swing.JTabbedPane", "javax.swing.JScrollPane",
         "javax.swing.JSplitPane", "javax.swing.Box",
         "javax.swing.JViewport", "javax.swing.JScrollBar",
         "javax.swing.JLayeredPane",
         "javax.swing.JList$AccessibleJList$AccessibleJListChild",
         "javax.swing.JList$AccessibleJList", "javax.swing.JList",
         "javax.swing.JScrollPane$ScrollBar",
         "javax.swing.plaf.metal.MetalScrollButton");
   
   /**
    * Calculates the replayID of a JFCEvent needed for compatibility with guitar suite
    * @param List of {@link JFCGUIElementSpec}s that represent the component path of a event target
    * for which the replayID should be calculated. 
    * @return replayID
    */
        
   public String calculateReplayID(List<JFCGUIElementSpec> guiElementPath){
           String replayID = "";
           long hashCode = 1;
         
           ListIterator<JFCGUIElementSpec> iterator = guiElementPath.listIterator();
           
           JFCGUIElementSpec currentSpec = iterator.next();
           String title = currentSpec.getName();
           String fuzzyTitle = getFuzzyTitle(title);
           long windowHashCode = fuzzyTitle.hashCode();
           windowHashCode = (windowHashCode * 2) & 0xffffffffL;

           long propagatedHashCode = windowHashCode;
           
           // construct looks complicated but avoids going back and force through path
           if (iterator.hasNext())
                   currentSpec = iterator.next();
           else
                   currentSpec = null;

           // walk through component path and calculate hashcode
           while(currentSpec != null){
                   long localHashCode = getLocalHashCode(currentSpec);
                   hashCode = propagatedHashCode * prime + localHashCode;
                   hashCode = (hashCode * 2) & 0xffffffffL;

                   if (iterator.hasNext()){
                           currentSpec = iterator.next();
                           Integer index = currentSpec.getIndex();
                           propagatedHashCode = prime * propagatedHashCode
                                           + index.hashCode();
                   }
                   else
                           currentSpec = null;
                           
           }

           replayID = "e" + hashCode;

           return replayID;
   }
   
   
        /**
         * Calculates the replayID of a JFCEvent needed for compatibility with guitar suite 
         * @param event for which the ID should be calculated
         * @return replayID
         */
        public String calculateReplayID(Event event){
                List<JFCGUIElementSpec> guiElementPath = new ArrayList<JFCGUIElementSpec>();
                
                IEventTarget target = event.getTarget();
                JFCGUIElement jfcTarget = (JFCGUIElement) target;
                
                // extract element path
                JFCGUIElement currentTarget = jfcTarget;
                while (currentTarget != null){
                        JFCGUIElementSpec currentSpec = (JFCGUIElementSpec) currentTarget.getSpecification();
                        guiElementPath.add(0, currentSpec);
                        currentTarget = (JFCGUIElement) currentTarget.getParent();
                }
                
                // calculation is delegated to other calculateReplayID method
                return this.calculateReplayID(guiElementPath);
        }
        
        /**
         * Calculates the hashcode part of a component.
         * @param spec The {@link JFCGUIElementSpec} for which the hashcode should be calculated.
         * @return the local hashcode
         */
        
        private long getLocalHashCode(JFCGUIElementSpec spec){
                long hashcode = 1;
                String wClass = spec.getType();
                if (IGNORED_CLASSES.contains(wClass)) {
                    hashcode = (prime * hashcode + (wClass.equals("null") ? 0 : (wClass
                               .hashCode())));
                    return hashcode;
                }
                else{
                        Map<String, String> idProperties = extractIDProperties(spec);
                        for (String property: idProperties.keySet()){
                                String value = idProperties.get(property);
                                if (!value.equals("null")){
                                        hashcode = prime * hashcode + property.hashCode();
                                        hashcode = prime * hashcode + value.hashCode();
                                }
                        }
                }
                
                hashcode = (hashcode * 2) & 0xffffffffL;
                
                return hashcode;
        }
        
        /**
         * Extracts the IDProperties from a given {@link JFCGUIElementSpec}.
         * @param spec
         * @return LinkedHashMap that contains the IDProperties and its values.
         */
        
        private Map<String, String> extractIDProperties(JFCGUIElementSpec spec){
                LinkedHashMap<String, String> idProperties = new LinkedHashMap<String, String>();
                if (ID_PROPERTIES.contains("Class")){
                        idProperties.put("Class", spec.getType());
                }
                if (ID_PROPERTIES.contains("Title")){
                        String name = spec.getName();
                        // spec returns extra "" that need to be removed
                        idProperties.put("Title", name.substring(1, name.length() - 1));
                }
                if (ID_PROPERTIES.contains("Icon")){
                        idProperties.put("Icon", spec.getIcon());
                }
                if (ID_PROPERTIES.contains("Index")){
                        idProperties.put("Index", Integer.toString(spec.getIndex()));
                }       
                return idProperties;
        }
        
        /**
         * Guitar has a special way to deal with window titles when
         * calculating unique widget IDs. This method mimics Guitar's
         * behavior (compare guitar source code: edu.umd.cs.guitar.
         * model.JFCDefaultIDGeneratorSimple).
         * @param title
         * @return fuzzyTitle
         */

        private String getFuzzyTitle(String title){
                final List<String> PATTERNS = 
                                Arrays.asList("Rachota .*",
                                                "OmegaT-.*",
                                                "Buddi.*",
                                                "Open:.*",
                                                "JabRef.*",
                                                "GanttProject.*",
                                                ".*Pauker.*",
                                                ".*FreeMind.*",
                                                ".* - ArgoUML.*",
                                                "Save Project .*");


                for (String sPattern : PATTERNS) {
                        if (matchRegex(title, sPattern)) {
                                return sPattern;
                        }
                }

                return title;
        }

        /**
         * Determine if the input string matches the input regex pattern.
         * This method mimics Guitars behavior.
         * Attempt to match the pattern 'sPattern' with the string 'sInputString'.

         * @param sInputString    Input string to match with pattern
         * @param sPattern        Regex pattern to match with string
         * @return                True if match, false otherwise
         */
        
        private static boolean
        matchRegex(String sInputString,
                        String sPattern)
        {
                Pattern pattern;
                Matcher matcher;

                pattern = Pattern.compile(sPattern);
                matcher = pattern.matcher(sInputString);
                if (matcher.matches()) {
                        return true;
                }

                return false;
        }
        
};