/*
* Copyright 2003-2013 JetBrains s.r.o.
*
* 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 jetbrains.mps.editor.runtime.style;
/**
* User: shatalin
* Date: 1/14/13
*/
public final class InheritableStyleAttribute<T> extends AbstractStyleAttribute<T> {
private T myDefaultValue;
/*package*/ InheritableStyleAttribute(String name, T defaultValue, boolean register) {
super(name, register);
myDefaultValue = defaultValue;
}
public InheritableStyleAttribute(String name, T defaultValue) {
this(name, defaultValue, false);
}
public InheritableStyleAttribute(String name) {
this(name, null, false);
}
@Override
public T combine(T parentValue, T currentValue) {
if (currentValue == null) {
if (parentValue != null) {
return parentValue;
} else {
return myDefaultValue;
}
} else {
return currentValue;
}
}
}