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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) 2004-2015 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 that always returns the same value, independent of the object it is applied to.
* Created: 06.03.2006 08:59:02
* @param the type of the value to get from the object
* @author Volker Bergmann
*/
public class ConstantAccessor implements Accessor {
/**
* the value to return; null is allowed
*/
private V value;
public ConstantAccessor() {
this(null);
}
public ConstantAccessor(V value) {
this.value = value;
}
@Override
public V getValue(Object item) {
return this.value;
}
public void setValue(V value) {
this.value = value;
}
@SuppressWarnings("rawtypes")
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass())
return false;
final ConstantAccessor that = (ConstantAccessor) o;
return (value != null ? value.equals(that.value) : that.value == null);
}
@Override
public int hashCode() {
return (value != null ? value.hashCode() : 0);
}
}