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/*******************************************************************************
* Copyright (c) 2013, 2016 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal.transformer;
import java.util.Map;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
import org.eclipse.jpt.common.utility.transformer.Transformer;
/**
* A transformer that will map the input to an output via a client-configured
* map.
*
* @param <I> input: the type of the object passed to the transformer
* (i.e. the type of the map's keys)
* @param <O> output: the type of the object returned by the transformer
* (i.e. the type of the map's values)
*/
public class MapTransformer<I, O>
implements Transformer<I, O>
{
private final Map<? super I, ? extends O> map;
public MapTransformer(Map<? super I, ? extends O> map) {
super();
if (map == null) {
throw new NullPointerException();
}
this.map = map;
}
public O transform(I input) {
return this.map.get(input);
}
public Map<? super I, ? extends O> getMap() {
return this.map;
}
@Override
public String toString() {
return ObjectTools.toString(this, this.map);
}
}
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