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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* 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 org.databene.commons.accessor;
import org.databene.commons.Accessor;
/**
* Accessor that consecutively queries a chain of accessors
* until one provides the requested value.
* @since 0.3.0
* @author Volker Bergmann
*/
public class FallbackAccessor implements Accessor {
private Accessor[] realAccessors;
public FallbackAccessor(Accessor ... realAccessors) {
this.realAccessors = realAccessors;
}
@Override
public V getValue(C target) {
for (Accessor realAccessor : realAccessors) {
V value = realAccessor.getValue(target);
if (value != null)
return value;
}
return null;
}
}