NullDecorator.java

/***
 * Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
 * 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 br.com.caelum.vraptor.http.iogi;

import javax.enterprise.inject.Vetoed;

import br.com.caelum.iogi.Instantiator;
import br.com.caelum.iogi.parameters.Parameters;
import br.com.caelum.iogi.reflection.Target;

@Vetoed
final class NullDecorator implements Instantiator<Object> {
	private final Instantiator<?> delegateInstantiator;

	public NullDecorator(Instantiator<?> delegateInstantiator) {
		this.delegateInstantiator = delegateInstantiator;
	}

	@Override
	public boolean isAbleToInstantiate(Target<?> target) {
		return delegateInstantiator.isAbleToInstantiate(target);
	}

	@Override
	public Object instantiate(Target<?> target, Parameters parameters) {
		if (!parameters.hasRelatedTo(target)) {
			return null;
		}
		return delegateInstantiator.instantiate(target, parameters);
	}
}