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      1 /*
      2  * Copyright (C) 2012 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.eclipse.gltrace.state.transforms;
     18 
     19 import com.android.ide.eclipse.gltrace.state.GLListProperty;
     20 import com.android.ide.eclipse.gltrace.state.IGLProperty;
     21 
     22 /**
     23  * A {@link ListElementAddTransform} provides the ability to add a new property to a list of
     24  * properties in the GL State.
     25  */
     26 public class ListElementAddTransform implements IStateTransform {
     27     private final IGLPropertyAccessor mAccessor;
     28     private final IGLProperty mElement;
     29 
     30     public ListElementAddTransform(IGLPropertyAccessor accessor, IGLProperty element) {
     31         mAccessor = accessor;
     32         mElement = element;
     33     }
     34 
     35     @Override
     36     public void apply(IGLProperty currentState) {
     37         GLListProperty list = getList(currentState);
     38         if (list != null) {
     39             list.add(mElement);
     40         }
     41     }
     42 
     43     @Override
     44     public void revert(IGLProperty currentState) {
     45         GLListProperty list = getList(currentState);
     46         if (list != null) {
     47             list.remove(mElement);
     48         }
     49     }
     50 
     51     @Override
     52     public IGLProperty getChangedProperty(IGLProperty currentState) {
     53         return getList(currentState);
     54     }
     55 
     56     private GLListProperty getList(IGLProperty state) {
     57         IGLProperty p = state;
     58 
     59         if (mAccessor != null) {
     60             p = mAccessor.getProperty(p);
     61         }
     62 
     63         if (p instanceof GLListProperty) {
     64             return (GLListProperty) p;
     65         } else {
     66             return null;
     67         }
     68     }
     69 }
     70