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/*
* 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;
}
}
}
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