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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      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 
     17 package com.android.ide.common.rendering.api;
     18 
     19 import com.android.resources.ResourceType;
     20 
     21 import java.util.ArrayList;
     22 import java.util.Collections;
     23 import java.util.Iterator;
     24 import java.util.List;
     25 
     26 /**
     27  * A data binding item. It contain a {@link ResourceReference} to the view used to represent it.
     28  * It also contains how many items of this type the AdapterView should display.
     29  *
     30  * It can also contain an optional list of children in case the AdapterView is an
     31  * ExpandableListView. In this case, the count value is used as a repeat count for the children,
     32  * similar to {@link AdapterBinding#getRepeatCount()}.
     33  *
     34  */
     35 public class DataBindingItem implements Iterable<DataBindingItem> {
     36     private final ResourceReference mReference;
     37     private final int mCount;
     38     private List<DataBindingItem> mChildren;
     39 
     40     public DataBindingItem(ResourceReference reference, int count) {
     41         mReference = reference;
     42         mCount = count;
     43     }
     44 
     45     public DataBindingItem(String name, boolean platformLayout, int count) {
     46         this(new ResourceReference(name, platformLayout), count);
     47     }
     48 
     49     public DataBindingItem(String name, boolean platformLayout) {
     50         this(name, platformLayout, 1);
     51     }
     52 
     53     public DataBindingItem(String name, int count) {
     54         this(name, false /*platformLayout*/, count);
     55     }
     56 
     57     public DataBindingItem(String name) {
     58         this(name, false /*platformLayout*/, 1);
     59     }
     60 
     61     /**
     62      * Returns the {@link ResourceReference} for the view. The {@link ResourceType} for the
     63      * referenced resource is implied to be {@link ResourceType#LAYOUT}.
     64      */
     65     public ResourceReference getViewReference() {
     66         return mReference;
     67     }
     68 
     69     /**
     70      * The repeat count for this object or the repeat count for the children if there are any.
     71      */
     72     public int getCount() {
     73         return mCount;
     74     }
     75 
     76     public void addChild(DataBindingItem child) {
     77         if (mChildren == null) {
     78             mChildren = new ArrayList<DataBindingItem>();
     79         }
     80 
     81         mChildren.add(child);
     82     }
     83 
     84     public List<DataBindingItem> getChildren() {
     85         if (mChildren != null) {
     86             return mChildren;
     87         }
     88 
     89         return Collections.emptyList();
     90     }
     91 
     92     @Override
     93     public Iterator<DataBindingItem> iterator() {
     94         List<DataBindingItem> list = getChildren();
     95         return list.iterator();
     96     }
     97 }
     98