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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
      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 
     17 package com.android.ide.eclipse.adt.internal.build.builders;
     18 
     19 import com.android.sdklib.SdkConstants;
     20 
     21 import org.eclipse.core.resources.IResource;
     22 import org.eclipse.core.resources.IResourceDelta;
     23 import org.eclipse.core.resources.IResourceDeltaVisitor;
     24 import org.eclipse.core.runtime.CoreException;
     25 import org.eclipse.core.runtime.IPath;
     26 
     27 /**
     28  * Delta visitor specifically for Library resources.
     29  * The goal is to detect library resource/library changes when compiling the main project
     30  * and trigger a resource recompilation/repackaging.
     31  *
     32  */
     33 public class LibraryDeltaVisitor implements IResourceDeltaVisitor {
     34 
     35     private boolean mResChange = false;
     36     private boolean mLibChange = false;
     37 
     38     public boolean getResChange() {
     39         return mResChange;
     40     }
     41 
     42     public boolean getLibChange() {
     43         return mLibChange;
     44     }
     45 
     46     public boolean visit(IResourceDelta delta) throws CoreException {
     47         // we are only going to look for changes in res/
     48         // Since the delta visitor goes through the main
     49         // folder before its children we can check when the path segment
     50         // count is 2 (format will be /$Project/folder) and make sure we are
     51         // processing res/
     52 
     53         IResource resource = delta.getResource();
     54         IPath path = resource.getFullPath();
     55         String[] segments = path.segments();
     56 
     57         // since the delta visitor also visits the root we return true if
     58         // segments.length = 1
     59         if (segments.length == 1) {
     60             // this is always the Android project since we call
     61             // Builder#getDelta(IProject) on the project itself.
     62             return true;
     63         } else if (segments.length == 2) {
     64             if (SdkConstants.FD_RESOURCES.equalsIgnoreCase(segments[1])) {
     65                 // res folder was changed!
     66                 // This is all that matters, we can stop (return false below)
     67                 mResChange = true;
     68             } else if (SdkConstants.FD_NATIVE_LIBS.equalsIgnoreCase(segments[1])) {
     69                 // libs folder was changed.
     70                 // This is all that matters, we can stop (return false below)
     71                 mLibChange = true;
     72             }
     73         }
     74 
     75         return false;
     76     }
     77 }
     78