javataskwrapper.java

一个java写的business process management系统

/*
 * Copyright (c) 2003-2004, Alexander Greif
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Flow4J-Eclipse project nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package net.orthanc.flow4j.designer.model;

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.orthanc.flow4j.designer.core.Flow4JPlugin;
import net.orthanc.flow4j.runtime.ITaskFlowlet;
import net.orthanc.flow4j.runtime.descriptors.TaskPropertyDescriptor;
import net.orthanc.flow4j.runtime.descriptors.TaskPropertyDescriptors;

import org.eclipse.jdt.core.IJavaProject;

/**
 * This class wraps a Task Flowlet instance with its properties.
 * @author greifa
 */
public class JavaTaskWrapper implements ITaskWrapper {

	private String taskClassName;
	private ITaskFlowlet taskFlowletInstance;
	private Map taskProperties;

	/**
	 * Returns a Map that contains the tasks properties and their values.
	 * @return a Map that contains the tasks properties and their values.
	 */
	public Map getTaskProperties() {
		return taskProperties;
	}

	/**
	 * Sets the tasks properties and their values.
	 * @param map Map containing the tasks properties and their values.
	 */
	public void setTaskProperties(Map map) {
		taskProperties = map;
	}

	/**
	 * Sets a task property. Creates the properties Map if necessary.
	 * @param key the property key
	 * @param value the property value
	 */
	public void setTaskProperty(String key, String value) {
		if (taskProperties == null)
			taskProperties = new HashMap();
		taskProperties.put(key, value);
	}

	/**
	 * Returns a task property or <code>null</code> if the property is 
	 * not set or the task has no properties at all
	 * @param key the property key
	 * @return a task property or <code>null</code>
	 */
	public String getTaskProperty(String key) {
		if (taskProperties == null)
			return null;
		return (String) taskProperties.get(key);
	}

	/**
	 * Returns the task flowlet instance, or throws a ClassNotFoundException.
	 * @param taskClassName the calssname of the task flowlet
	 * @return the task flowlet instance, or throws a ClassNotFoundException.
	 * @throws ClassNotFoundException
	 */
	public ITaskFlowlet getTaskFlowletInstance(String taskClassName)
		throws ClassNotFoundException, Throwable {

		this.taskClassName = taskClassName;
		if (taskFlowletInstance != null
			&& taskFlowletInstance.getClass().getName().equals(taskClassName))
			return taskFlowletInstance;

		return Flow4JPlugin.getTaskFlowletInstance(taskClassName);
	}

	/**
	 * Returns a task flowlet instance. That is searched in the project's classpath.
	 * @param taskClassName
	 * @param javaProject
	 * @return
	 * @throws ClassNotFoundException
	 * @throws Throwable
	 */
	public ITaskFlowlet getTaskFlowletInstance(
		String taskClassName,
		IJavaProject javaProject)
		throws ClassNotFoundException, Throwable {

		taskFlowletInstance =
			Flow4JPlugin.getTaskFlowletInstance(taskClassName, javaProject);
		checkTaskProperties(taskFlowletInstance.getPropertyDescriptors());

		return taskFlowletInstance;

	}
			
			
			
	/**
	 * Returns a task flowlet instance. That is searched in the given classpath.
	 * @param taskClassName
	 * @param classpathURLs
	 * @return a task flowlet instance.
	 * @throws ClassNotFoundException
	 * @throws Throwable
	 */
	public ITaskFlowlet getTaskFlowletInstance(
		String taskClassName,
		List classpathURLs)
		throws ClassNotFoundException, Throwable {
/*		JavaTaskFlowletClassLoader taskFlowletClassLoader =
			new JavaTaskFlowletClassLoader(
				classpathEntries,
				Flow4JPlugin
					.getDefault()
					.getDescriptor()
					.getPluginClassLoader());
		taskFlowletInstance =
			taskFlowletClassLoader.getTaskInstance(taskClassName);
*/
		taskFlowletInstance = Flow4JPlugin.getTaskFlowletInstance(taskClassName, classpathURLs);
		checkTaskProperties(taskFlowletInstance.getPropertyDescriptors());

		return taskFlowletInstance;
	}

	/**
	 * Checks the currently hold properties fit to the property
	 * descriptors of the task flowlet instance.
	 * Deleting the properties of some previous task flowlet happens when the label's content changes.
	 * Here we only set the defaults to empty string
	 * @param descs property descriptors of the task flowlet instance
	 */
	private void checkTaskProperties(TaskPropertyDescriptors descs) {
		if (descs == null || descs.isEmpty())
			return;
		if (taskProperties == null)
			taskProperties = new HashMap();
		for (Iterator iter = descs.iterator(); iter.hasNext();) {
			TaskPropertyDescriptor desc = (TaskPropertyDescriptor) iter.next();
			if (taskProperties.get(desc.getName()) == null)
				taskProperties.put(desc.getName(), "");
		}
	}

	/**
	 * Returns the java task flowlet instance
	 * @return the java task flowlet instance
	 */
	public ITaskFlowlet getJavaTaskFlowletInstance() {
		return taskFlowletInstance;
	}

	/**
	 * Returns the task's class name
	 * @return the task's class name
	 */
	public String getTaskClassName() {
		return taskClassName;
	}

}