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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.GLListProperty;
import com.android.ide.eclipse.gltrace.state.IGLProperty;
/**
* A {@link ListElementAddTransform} provides the ability to add a new property to a list of
* properties in the GL State.
*/
public class ListElementAddTransform implements IStateTransform {
private final IGLPropertyAccessor mAccessor;
private final IGLProperty mElement;
public ListElementAddTransform(IGLPropertyAccessor accessor, IGLProperty element) {
mAccessor = accessor;
mElement = element;
}
@Override
public void apply(IGLProperty currentState) {
GLListProperty list = getList(currentState);
if (list != null) {
list.add(mElement);
}
}
@Override
public void revert(IGLProperty currentState) {
GLListProperty list = getList(currentState);
if (list != null) {
list.remove(mElement);
}
}
@Override
public IGLProperty getChangedProperty(IGLProperty currentState) {
return getList(currentState);
}
private GLListProperty getList(IGLProperty state) {
IGLProperty p = state;
if (mAccessor != null) {
p = mAccessor.getProperty(p);
}
if (p instanceof GLListProperty) {
return (GLListProperty) p;
} else {
return null;
}
}
}
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