platform/vcs-impl/src/com/intellij/openapi/vcs/changes/ChangesDelta.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.openapi.vcs.changes;
  17
  18 import com.intellij.openapi.project.Project;
  19 import com.intellij.openapi.util.Pair;
  20 import com.intellij.openapi.vcs.AbstractVcs;
  21 import com.intellij.openapi.vcs.ProjectLevelVcsManager;
  22 import com.intellij.openapi.vcs.VcsKey;
  23 import com.intellij.openapi.vcs.impl.CollectionsDelta;
  24
  25 import java.util.Collection;
  26 import java.util.List;
  27 import java.util.Set;
  28
  29 public class ChangesDelta {
  30   private final PlusMinus<Pair<String, AbstractVcs>> myDeltaListener;
  31   private ProjectLevelVcsManager myVcsManager;
  32   private boolean myInitialized;
  33
  34   public ChangesDelta(final Project project, final PlusMinus<Pair<String, AbstractVcs>> deltaListener) {
  35     myDeltaListener = deltaListener;
  36     myVcsManager = ProjectLevelVcsManager.getInstance(project);
  37   }
  38
  39   public void step(final ChangeListsIndexes was, final ChangeListsIndexes became) {
  40     List<Pair<String, VcsKey>> wasAffected = was.getAffectedFilesUnderVcs();
  41     if (! myInitialized) {
  42       sendPlus(wasAffected);
  43       myInitialized = true;
  44       return;
  45     }
  46     final List<Pair<String, VcsKey>> becameAffected = became.getAffectedFilesUnderVcs();
  47
  48     final Set<Pair<String,VcsKey>> toRemove = CollectionsDelta.notInSecond(wasAffected, becameAffected);
  49     final Set<Pair<String, VcsKey>> toAdd = CollectionsDelta.notInSecond(becameAffected, wasAffected);
  50
  51     if (toRemove != null) {
  52       for (Pair<String, VcsKey> pair : toRemove) {
  53         myDeltaListener.minus(convertPair(pair));
  54       }
  55     }
  56     sendPlus(toAdd);
  57   }
  58
  59   private void sendPlus(final Collection<Pair<String, VcsKey>> toAdd) {
  60     if (toAdd != null) {
  61       for (Pair<String, VcsKey> pair : toAdd) {
  62         myDeltaListener.plus(convertPair(pair));
  63       }
  64     }
  65   }
  66
  67   private Pair<String, AbstractVcs> convertPair(final Pair<String, VcsKey> pair) {
  68     final VcsKey vcsKey = pair.getSecond();
  69     return new Pair<String, AbstractVcs>(pair.getFirst(), (vcsKey == null) ? null : myVcsManager.findVcsByName(vcsKey.getName()));
  70   }
  71 }