/*
 * Copyright 2002-2008 the original author or authors.
 *
 * 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.springframework.scripting.support;

import org.springframework.aop.target.dynamic.BeanFactoryRefreshableTargetSource;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.scripting.ScriptFactory;
import org.springframework.scripting.ScriptSource;
import org.springframework.util.Assert;

/**
 * Subclass of {@link BeanFactoryRefreshableTargetSource} that determines whether
 * a refresh is required through the given {@link ScriptFactory}.
 *
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @author Mark Fisher
 * @since 2.0
 */
public class RefreshableScriptTargetSource extends BeanFactoryRefreshableTargetSource {

	private final ScriptFactory scriptFactory;

	private final ScriptSource scriptSource;

	private final boolean isFactoryBean;


	/**
	 * Create a new RefreshableScriptTargetSource.
	 * @param beanFactory the BeanFactory to fetch the scripted bean from
	 * @param beanName the name of the target bean
	 * @param scriptFactory the ScriptFactory to delegate to for determining
	 * whether a refresh is required
	 * @param scriptSource the ScriptSource for the script definition
	 * @param isFactoryBean whether the target script defines a FactoryBean
	 */
	public RefreshableScriptTargetSource(BeanFactory beanFactory, String beanName,
			ScriptFactory scriptFactory, ScriptSource scriptSource, boolean isFactoryBean) {

		super(beanFactory, beanName);
		Assert.notNull(scriptFactory, "ScriptFactory must not be null");
		Assert.notNull(scriptSource, "ScriptSource must not be null");
		this.scriptFactory = scriptFactory;
		this.scriptSource = scriptSource;
		this.isFactoryBean = isFactoryBean;
	}


	/**
	 * Determine whether a refresh is required through calling
	 * ScriptFactory's <code>requiresScriptedObjectRefresh</code> method.
	 * @see ScriptFactory#requiresScriptedObjectRefresh(ScriptSource)
	 */
	@Override
	protected boolean requiresRefresh() {
		return this.scriptFactory.requiresScriptedObjectRefresh(this.scriptSource);
	}

	/**
	 * Obtain a fresh target object, retrieving a FactoryBean if necessary.
	 */
	@Override
	protected Object obtainFreshBean(BeanFactory beanFactory, String beanName) {
		return super.obtainFreshBean(beanFactory,
				(this.isFactoryBean ? BeanFactory.FACTORY_BEAN_PREFIX + beanName : beanName));
	}

}
