    001    /*****************************************************************************
    002     * Copyright (C) PicoContainer Organization. All rights reserved.            *
    003     * ------------------------------------------------------------------------- *
    004     * The software in this package is published under the terms of the BSD      *
    005     * style license a copy of which has been included with this distribution in *
    006     * the LICENSE.txt file.                                                     *
    007     *                                                                           *
    008     *****************************************************************************/
    009    package org.picocontainer.behaviors;
    010
    011    import org.picocontainer.ComponentAdapter;
    012    import org.picocontainer.LifecycleStrategy;
    013    import org.picocontainer.ObjectReference;
    014    import org.picocontainer.PicoCompositionException;
    015    import org.picocontainer.PicoContainer;
    016    import org.picocontainer.ComponentLifecycle;
    017
    018    import java.lang.reflect.Type;
    019    import java.io.Serializable;
    020
    021    /**
    022     * behaviour for allows components to be guarded by another component
    023     *
    024     * @author Paul Hammant
    025     * @param <T>
    026     */
    027    @SuppressWarnings("serial")
    028    public class Guarded<T> extends AbstractBehavior<T> {
    029        private final String guard;
    030
    031        public Guarded(ComponentAdapter delegate, String guard) {
    032            super(delegate);
    033            this.guard = guard;
    034        }
    035
    036        public T getComponentInstance(PicoContainer container, Type into) throws PicoCompositionException {
    037            container.getComponent(guard);
    038            return super.getComponentInstance(container, into);
    039        }
    040
    041        public String getDescriptor() {
    042            return "Guarded(with " + guard + ")";
    043        }
    044
    045
    046    }