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      1 /*
      2  * Copyright (C) 2007 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.ui;
     18 
     19 import com.android.ide.common.resources.ResourceFile;
     20 import com.android.ide.common.resources.ResourceItem;
     21 import com.android.ide.common.resources.ResourceRepository;
     22 import com.android.resources.ResourceType;
     23 
     24 import org.eclipse.jface.viewers.ITreeContentProvider;
     25 import org.eclipse.jface.viewers.Viewer;
     26 
     27 import java.util.Arrays;
     28 import java.util.Collections;
     29 import java.util.List;
     30 
     31 /**
     32  * Content provider for the Resource Explorer TreeView.
     33  * Each level of the tree is represented by a different class.
     34  * <ul>
     35  * <li>{@link ResourceType}. This represents the list of existing Resource Type present
     36  * in the resources. This can be matched to the subclasses inside the class <code>R</code>
     37  * </li>
     38  * <ul>
     39  * <li>{@link ResourceItem}. This represents one resource (which can existing in various alternate
     40  * versions). This is similar to the resource Ids defined as <code>R.sometype.id</code>.
     41  * </li>
     42  * <ul>
     43  * <li>{@link ResourceFile}. (optional) This represents a particular version of the
     44  * {@link ResourceItem}. It is displayed as a list of resource qualifier.
     45  * </li>
     46  * </ul>
     47  * </ul>
     48  * </ul>
     49  *
     50  * @see ResourceLabelProvider
     51  */
     52 public class ResourceContentProvider implements ITreeContentProvider {
     53 
     54     /**
     55      * The current ProjectResources being displayed.
     56      */
     57     private ResourceRepository mResources;
     58 
     59     private boolean mFullLevels;
     60 
     61    /**
     62      * Constructs a new content providers for resource display.
     63      * @param fullLevels if <code>true</code> the content provider will suppport all 3 levels. If
     64      * <code>false</code>, only two levels are provided.
     65      */
     66     public ResourceContentProvider(boolean fullLevels) {
     67         mFullLevels = fullLevels;
     68     }
     69 
     70     @Override
     71     public Object[] getChildren(Object parentElement) {
     72         if (parentElement instanceof ResourceType) {
     73             Object[] array = mResources.getResourceItemsOfType(
     74                     (ResourceType)parentElement).toArray();
     75             Arrays.sort(array);
     76             return array;
     77         } else if (mFullLevels && parentElement instanceof ResourceItem) {
     78             return ((ResourceItem)parentElement).getSourceFileArray();
     79         }
     80         return null;
     81     }
     82 
     83     @Override
     84     public Object getParent(Object element) {
     85         // pass
     86         return null;
     87     }
     88 
     89     @Override
     90     public boolean hasChildren(Object element) {
     91         if (element instanceof ResourceType) {
     92             return mResources.hasResourcesOfType((ResourceType)element);
     93         } else if (mFullLevels && element instanceof ResourceItem) {
     94             return ((ResourceItem)element).hasAlternates();
     95         }
     96         return false;
     97     }
     98 
     99     @Override
    100     public Object[] getElements(Object inputElement) {
    101         if (inputElement instanceof ResourceRepository) {
    102             if ((ResourceRepository)inputElement == mResources) {
    103                 // get the top level resources.
    104                 List<ResourceType> types = mResources.getAvailableResourceTypes();
    105                 Collections.sort(types);
    106                 return types.toArray();
    107             }
    108         }
    109 
    110         return new Object[0];
    111     }
    112 
    113     @Override
    114     public void dispose() {
    115         // pass
    116     }
    117 
    118     @Override
    119     public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
    120         if (newInput instanceof ResourceRepository) {
    121              mResources = (ResourceRepository)newInput;
    122         }
    123     }
    124 }
    125