edu.du.penrose.systems.fedoraApp.tasks.WorkerFactory.java Source code

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Here is the source code for edu.du.penrose.systems.fedoraApp.tasks.WorkerFactory.java

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/*
 * Copyright 2012 University of Denver
 * Author Chet Rebman
 * 
 * This file is part of FedoraApp.
 * 
 * FedoraApp is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * FedoraApp is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with FedoraApp.  If not, see <http://www.gnu.org/licenses/>.
*/
package edu.du.penrose.systems.fedoraApp.tasks;

import java.io.File;
import java.lang.reflect.Constructor;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import edu.du.penrose.systems.fedoraApp.FedoraAppConstants;
import edu.du.penrose.systems.fedoraApp.ProgramFileProperties;
import edu.du.penrose.systems.fedoraApp.ProgramProperties;
import edu.du.penrose.systems.util.MyServletContextListener;

/**
 * Create the worker specified in the remote task properties file ie {institution}_{batchSet}_REMOTE.properties, if there is problem log it and return null.
 * 
 * @see FedoraAppConstants#REMOTE_TASK_WORKER_CLASS_PROPERTY
 * 
 */
public class WorkerFactory {
    /** 
     * Logger for this class and subclasses.
     */
    protected static final Log logger = LogFactory.getLog("edu.du.penrose.systems.fedoraApp.tasks.WorkerFactory");

    private WorkerFactory() {
        // disble constructor
    }

    /**
     * Return the worker specified in the remote task properties file ie {institution}_{batchSet}_REMOTE.properties, if there is problem log it and return null.
     * 
     * @see FedoraAppConstants#REMOTE_TASK_WORKER_CLASS_PROPERTY
     * 
     * @param batchSetName is of type codu_ectd where codu is the institution and ectd is the batch set name
     * @return the worker object or null.
     */
    public static WorkerInf getWorker(String batchSetName) {
        String[] tempArray = batchSetName.split("_");
        String institution = tempArray[0];
        String batchSet = tempArray[1];
        WorkerInf myWorkerObject = null;
        String propertiesFileName = null;
        String workerClassName = null;

        try {
            if (batchSetName.endsWith(FedoraAppConstants.REMOTE_TASK_NAME_SUFFIX)) {
                propertiesFileName = FedoraAppConstants.getServletContextListener().getInstituionURL().getFile()
                        + institution + "/" + batchSet + "/" + batchSet + FedoraAppConstants.REMOTE_TASK_NAME_SUFFIX
                        + ".properties";
            } else {
                propertiesFileName = FedoraAppConstants.getServletContextListener().getInstituionURL().getFile()
                        + institution + "/" + batchSet + "/" + batchSet
                        + FedoraAppConstants.BACKGROUND_TASK_NAME_SUFFIX + ".properties";
            }

            ProgramProperties optionsProperties = new ProgramFileProperties(new File(propertiesFileName));

            if (batchSetName.endsWith(FedoraAppConstants.REMOTE_TASK_NAME_SUFFIX)) {
                workerClassName = optionsProperties
                        .getProperty(FedoraAppConstants.REMOTE_TASK_WORKER_CLASS_PROPERTY);
            } else {
                workerClassName = optionsProperties.getProperty(FedoraAppConstants.TASK_WORKER_CLASS_PROPERTY);
            }

            if (workerClassName == null || workerClassName.length() == 0) {
                logger.error("Unable to find ingest class in" + propertiesFileName);
                return null;
            }

            Constructor<?> workerConsctuctor = Class.forName(workerClassName).getConstructor(String.class);
            myWorkerObject = (WorkerInf) workerConsctuctor.newInstance(batchSetName);
        } catch (Exception e) {
            logger.error("Unable to find ingest class for instituion_batchSet:" + institution + ", " + batchSet
                    + "  :" + e.getLocalizedMessage());
            return null;
        }

        return myWorkerObject;
    }
}