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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.

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/*
 * Copyright (C) 2004-2015 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 wrapper that returns a predefined value if getValue() is invoked with a 'null' source.
 * Created: 26.06.2005 08:22:21
 * @param  the object type to access
 * @param  the type of the value to get from the object
 * @author Volker Bergmann
 */
public abstract class NullSafeAccessor extends AccessorProxy {

    private V nullValue;

    public NullSafeAccessor(Accessor realAccessor, V nullValue) {
        super(realAccessor);
        this.nullValue = nullValue;
    }

    @Override
    public V getValue(C source) {
        return (source != null ? super.getValue(source) : nullValue);
    }
}