case-study/jdt-after/ui/org/eclipse/jdt/internal/ui/search/SearchParticipantsExtensionPoint.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2011 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 /*
  12  * Created on Apr 13, 2004
  13  *
  14  * TODO To change the template for this generated file go to Window -
  15  * Preferences - Java - Code Generation - Code and Comments
  16  */
  17 package org.eclipse.jdt.internal.ui.search;
  18
  19 import java.util.HashSet;
  20 import java.util.Iterator;
  21 import java.util.Set;
  22
  23 import org.eclipse.core.runtime.CoreException;
  24 import org.eclipse.core.runtime.IConfigurationElement;
  25 import org.eclipse.core.runtime.IStatus;
  26 import org.eclipse.core.runtime.Platform;
  27
  28 import org.eclipse.core.resources.IProject;
  29
  30 import org.eclipse.jdt.internal.ui.JavaPlugin;
  31
  32 public class SearchParticipantsExtensionPoint {
  33
  34         private Set<SearchParticipantDescriptor> fActiveParticipants= null;
  35         private static SearchParticipantsExtensionPoint fgInstance;
  36
  37         public boolean hasAnyParticipants() {
  38                 return Platform.getExtensionRegistry().getConfigurationElementsFor(JavaSearchPage.PARTICIPANT_EXTENSION_POINT).length > 0;
  39         }
  40
  41         private synchronized Set<SearchParticipantDescriptor> getAllParticipants() {
  42                 if (fActiveParticipants != null)
  43                         return fActiveParticipants;
  44                 IConfigurationElement[] allParticipants= Platform.getExtensionRegistry().getConfigurationElementsFor(JavaSearchPage.PARTICIPANT_EXTENSION_POINT);
  45                 fActiveParticipants= new HashSet<SearchParticipantDescriptor>(allParticipants.length);
  46                 for (int i= 0; i < allParticipants.length; i++) {
  47                         SearchParticipantDescriptor descriptor= new SearchParticipantDescriptor(allParticipants[i]);
  48                         IStatus status= descriptor.checkSyntax();
  49                         if (status.isOK()) {
  50                                 fActiveParticipants.add(descriptor);
  51                         } else {
  52                                 JavaPlugin.log(status);
  53                         }
  54                 }
  55                 return fActiveParticipants;
  56         }
  57
  58         private void collectParticipants(Set<SearchParticipantRecord> participants, IProject[] projects) {
  59                 Iterator<SearchParticipantDescriptor> activeParticipants= getAllParticipants().iterator();
  60                 Set<String> seenParticipants= new HashSet<String>();
  61                 while (activeParticipants.hasNext()) {
  62                         SearchParticipantDescriptor participant= activeParticipants.next();
  63                         String id= participant.getID();
  64                         if (participant.isEnabled() && !seenParticipants.contains(id)) {
  65                                 for (int i= 0; i < projects.length; i++) {
  66                                         try {
  67                                                 if (projects[i].hasNature(participant.getNature())) {
  68                                                         participants.add(new SearchParticipantRecord(participant, participant.create()));
  69                                                         seenParticipants.add(id);
  70                                                         break;
  71                                                 }
  72                                         } catch (CoreException e) {
  73                                                 JavaPlugin.log(e.getStatus());
  74                                                 participant.disable();
  75                                         }
  76                                 }
  77                         }
  78                 }
  79         }
  80
  81
  82
  83         public SearchParticipantRecord[] getSearchParticipants(IProject[] concernedProjects) {
  84                 Set<SearchParticipantRecord> participantSet= new HashSet<SearchParticipantRecord>();
  85                 collectParticipants(participantSet, concernedProjects);
  86                 SearchParticipantRecord[] participants= new SearchParticipantRecord[participantSet.size()];
  87                 return participantSet.toArray(participants);
  88         }
  89
  90         public static SearchParticipantsExtensionPoint getInstance() {
  91                 if (fgInstance == null)
  92                         fgInstance= new SearchParticipantsExtensionPoint();
  93                 return fgInstance;
  94         }
  95
  96         public static void debugSetInstance(SearchParticipantsExtensionPoint instance) {
  97                 fgInstance= instance;
  98         }
  99 }