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/*****************************************************************************
 * Copyright (C) PicoContainer Organization. All rights reserved.            *
 * ------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the BSD      *
 * style license a copy of which has been included with this distribution in *
 * the LICENSE.txt file.                                                     *
 *                                                                           *
 * Original code by Jon Tirsen                                               *
 *****************************************************************************/

package org.picocontainer.behaviors;

import org.picocontainer.ComponentAdapter;
import org.picocontainer.ComponentMonitor;
import org.picocontainer.ComponentMonitorStrategy;
import org.picocontainer.LifecycleStrategy;
import org.picocontainer.PicoCompositionException;
import org.picocontainer.PicoContainer;
import org.picocontainer.PicoVisitor;

import java.io.Serializable;
import java.lang.reflect.Type;

/**
 * 

* Component adapter which decorates another adapter. *

*

* This adapter supports a {@link org.picocontainer.ComponentMonitorStrategy component monitor strategy} * and will propagate change of monitor to the delegate if the delegate itself * support the monitor strategy. *

*

* This adapter also supports a {@link Behavior lifecycle manager} and a * {@link org.picocontainer.LifecycleStrategy lifecycle strategy} if the delegate does. *

* * @author Jon Tirsen * @author Aslak Hellesoy * @author Mauro Talevi */ public abstract class AbstractBehavior implements org.picocontainer.Behavior, ComponentMonitorStrategy, LifecycleStrategy, Serializable { protected final ComponentAdapter delegate; public AbstractBehavior(ComponentAdapter delegate) { this.delegate = delegate; } public Object getComponentKey() { return delegate.getComponentKey(); } public Class getComponentImplementation() { return delegate.getComponentImplementation(); } public T getComponentInstance(PicoContainer container) throws PicoCompositionException { return getComponentInstance(container, NOTHING.class); } public T getComponentInstance(PicoContainer container, Type into) throws PicoCompositionException { return (T) delegate.getComponentInstance(container, into); } public void verify(PicoContainer container) throws PicoCompositionException { delegate.verify(container); } public final ComponentAdapter getDelegate() { return delegate; } @SuppressWarnings("unchecked") public final U findAdapterOfType(Class adapterType) { if (adapterType.isAssignableFrom(this.getClass())) { return (U) this; } else { return delegate.findAdapterOfType(adapterType); } } public void accept(PicoVisitor visitor) { visitor.visitComponentAdapter(this); delegate.accept(visitor); } /** * Delegates change of monitor if the delegate supports * a component monitor strategy. * {@inheritDoc} */ public void changeMonitor(ComponentMonitor monitor) { if (delegate instanceof ComponentMonitorStrategy ) { ((ComponentMonitorStrategy)delegate).changeMonitor(monitor); } } /** * Returns delegate's current monitor if the delegate supports * a component monitor strategy. * {@inheritDoc} * @throws PicoCompositionException if no component monitor is found in delegate */ public ComponentMonitor currentMonitor() { if (delegate instanceof ComponentMonitorStrategy ) { return ((ComponentMonitorStrategy)delegate).currentMonitor(); } throw new PicoCompositionException("No component monitor found in delegate"); } /** * Invokes delegate start method if the delegate is a Behavior * {@inheritDoc} */ public void start(PicoContainer container) { if (delegate instanceof org.picocontainer.Behavior) { ((org.picocontainer.Behavior)delegate).start(container); } } /** * Invokes delegate stop method if the delegate is a Behavior * {@inheritDoc} */ public void stop(PicoContainer container) { if (delegate instanceof org.picocontainer.Behavior) { ((org.picocontainer.Behavior)delegate).stop(container); } } /** * Invokes delegate dispose method if the delegate is a Behavior * {@inheritDoc} */ public void dispose(PicoContainer container) { if (delegate instanceof org.picocontainer.Behavior) { ((org.picocontainer.Behavior)delegate).dispose(container); } } /** * Invokes delegate hasLifecycle method if the delegate is a Behavior * {@inheritDoc} */ public boolean componentHasLifecycle() { if (delegate instanceof org.picocontainer.Behavior) { return ((org.picocontainer.Behavior)delegate).componentHasLifecycle(); } return false; } public boolean isStarted() { if (delegate instanceof org.picocontainer.Behavior) { return ((org.picocontainer.Behavior)delegate).isStarted(); } return false; } // ~~~~~~~~ LifecycleStrategy ~~~~~~~~ /** * Invokes delegate start method if the delegate is a LifecycleStrategy * {@inheritDoc} */ public void start(Object component) { if (delegate instanceof LifecycleStrategy ) { ((LifecycleStrategy)delegate).start(component); } } /** * Invokes delegate stop method if the delegate is a LifecycleStrategy * {@inheritDoc} */ public void stop(Object component) { if (delegate instanceof LifecycleStrategy ) { ((LifecycleStrategy)delegate).stop(component); } } /** * Invokes delegate dispose method if the delegate is a LifecycleStrategy * {@inheritDoc} */ public void dispose(Object component) { if (delegate instanceof LifecycleStrategy ) { ((LifecycleStrategy)delegate).dispose(component); } } /** * Invokes delegate hasLifecycle(Class) method if the delegate is a LifecycleStrategy * {@inheritDoc} */ public boolean hasLifecycle(Class type) { return delegate instanceof LifecycleStrategy && ((LifecycleStrategy) delegate).hasLifecycle(type); } public boolean isLazy(ComponentAdapter adapter) { return delegate instanceof LifecycleStrategy && ((LifecycleStrategy) delegate).isLazy(adapter); } public String toString() { return getDescriptor() + ":" + delegate.toString(); } }