/*
 * Copyright 2002-2011 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.scheduling.quartz;

import java.lang.reflect.Method;

import org.quartz.JobDataMap;
import org.quartz.SchedulerContext;
import org.quartz.spi.TriggerFiredBundle;

import org.springframework.beans.BeanWrapper;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.PropertyAccessorFactory;
import org.springframework.util.ReflectionUtils;

/**
 * Subclass of {@link AdaptableJobFactory} that also supports Spring-style
 * dependency injection on bean properties. This is essentially the direct
 * equivalent of Spring's {@link QuartzJobBean} in the shape of a
 * Quartz 1.5 {@link org.quartz.spi.JobFactory}.
 *
 * <p>Applies scheduler context, job data map and trigger data map entries
 * as bean property values. If no matching bean property is found, the entry
 * is by default simply ignored. This is analogous to QuartzJobBean's behavior.
 *
 * <p>Compatible with Quartz 1.5+ as well as Quartz 2.0/2.1, as of Spring 3.1.
 *
 * @author Juergen Hoeller
 * @since 2.0
 * @see SchedulerFactoryBean#setJobFactory
 * @see QuartzJobBean
 */
public class SpringBeanJobFactory extends AdaptableJobFactory implements SchedulerContextAware {

	private String[] ignoredUnknownProperties;

	private SchedulerContext schedulerContext;


	/**
	 * Specify the unknown properties (not found in the bean) that should be ignored.
	 * <p>Default is <code>null</code>, indicating that all unknown properties
	 * should be ignored. Specify an empty array to throw an exception in case
	 * of any unknown properties, or a list of property names that should be
	 * ignored if there is no corresponding property found on the particular
	 * job class (all other unknown properties will still trigger an exception).
	 */
	public void setIgnoredUnknownProperties(String[] ignoredUnknownProperties) {
		this.ignoredUnknownProperties = ignoredUnknownProperties;
	}

	public void setSchedulerContext(SchedulerContext schedulerContext) {
		this.schedulerContext = schedulerContext;
	}


	/**
	 * Create the job instance, populating it with property values taken
	 * from the scheduler context, job data map and trigger data map.
	 */
	@Override
	protected Object createJobInstance(TriggerFiredBundle bundle) throws Exception {
		Object job = super.createJobInstance(bundle);
		BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(job);
		if (isEligibleForPropertyPopulation(bw.getWrappedInstance())) {
			MutablePropertyValues pvs = new MutablePropertyValues();
			if (this.schedulerContext != null) {
				pvs.addPropertyValues(this.schedulerContext);
			}
			pvs.addPropertyValues(getJobDetailDataMap(bundle));
			pvs.addPropertyValues(getTriggerDataMap(bundle));
			if (this.ignoredUnknownProperties != null) {
				for (String propName : this.ignoredUnknownProperties) {
					if (pvs.contains(propName) && !bw.isWritableProperty(propName)) {
						pvs.removePropertyValue(propName);
					}
				}
				bw.setPropertyValues(pvs);
			}
			else {
				bw.setPropertyValues(pvs, true);
			}
		}
		return job;
	}

	/**
	 * Return whether the given job object is eligible for having
	 * its bean properties populated.
	 * <p>The default implementation ignores {@link QuartzJobBean} instances,
	 * which will inject bean properties themselves.
	 * @param jobObject the job object to introspect
	 * @see QuartzJobBean
	 */
	protected boolean isEligibleForPropertyPopulation(Object jobObject) {
		return (!(jobObject instanceof QuartzJobBean));
	}

	// Reflectively adapting to differences between Quartz 1.x and Quartz 2.0...
	private JobDataMap getJobDetailDataMap(TriggerFiredBundle bundle) throws Exception {
		Method getJobDetail = bundle.getClass().getMethod("getJobDetail");
		Object jobDetail = ReflectionUtils.invokeMethod(getJobDetail, bundle);
		Method getJobDataMap = jobDetail.getClass().getMethod("getJobDataMap");
		return (JobDataMap) ReflectionUtils.invokeMethod(getJobDataMap, jobDetail);
	}

	// Reflectively adapting to differences between Quartz 1.x and Quartz 2.0...
	private JobDataMap getTriggerDataMap(TriggerFiredBundle bundle) throws Exception {
		Method getTrigger = bundle.getClass().getMethod("getTrigger");
		Object trigger = ReflectionUtils.invokeMethod(getTrigger, bundle);
		Method getJobDataMap = trigger.getClass().getMethod("getJobDataMap");
		return (JobDataMap) ReflectionUtils.invokeMethod(getJobDataMap, trigger);
	}

}
