| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.ide.eclipse.gltrace.state.transforms; |
| |
| import com.android.ide.eclipse.gltrace.state.GLSparseArrayProperty; |
| import com.android.ide.eclipse.gltrace.state.IGLProperty; |
| |
| /** |
| * A {@link SparseArrayElementAddTransform} changes given state by adding an |
| * element to a sparse array, if there is no item with the same key already. |
| */ |
| public class SparseArrayElementAddTransform implements IStateTransform { |
| private IGLPropertyAccessor mAccessor; |
| private int mKey; |
| private IGLProperty mOldValue; |
| |
| public SparseArrayElementAddTransform(IGLPropertyAccessor accessor, int key) { |
| mAccessor = accessor; |
| mKey = key; |
| } |
| |
| @Override |
| public void apply(IGLProperty currentState) { |
| GLSparseArrayProperty propertyArray = getArray(currentState); |
| if (propertyArray != null) { |
| mOldValue = propertyArray.getProperty(mKey); |
| if (mOldValue == null) { |
| // add only if there is no item with this key already present |
| propertyArray.add(mKey); |
| } |
| } |
| } |
| |
| @Override |
| public void revert(IGLProperty currentState) { |
| GLSparseArrayProperty propertyArray = getArray(currentState); |
| if (propertyArray != null) { |
| if (mOldValue == null) { |
| // delete only if we actually added this key |
| propertyArray.delete(mKey); |
| } |
| } |
| } |
| |
| @Override |
| public IGLProperty getChangedProperty(IGLProperty currentState) { |
| return getArray(currentState); |
| } |
| |
| private GLSparseArrayProperty getArray(IGLProperty state) { |
| IGLProperty p = state; |
| |
| if (mAccessor != null) { |
| p = mAccessor.getProperty(p); |
| } |
| |
| if (p instanceof GLSparseArrayProperty) { |
| return (GLSparseArrayProperty) p; |
| } else { |
| return null; |
| } |
| } |
| } |