gov.nih.nci.cabig.caaers.utils.CaaersSerializerUtil.java Source code

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Here is the source code for gov.nih.nci.cabig.caaers.utils.CaaersSerializerUtil.java

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/*******************************************************************************
 * Copyright SemanticBits, Northwestern University and Akaza Research
 * 
 * Distributed under the OSI-approved BSD 3-Clause License.
 * See http://ncip.github.com/caaers/LICENSE.txt for details.
 ******************************************************************************/
package gov.nih.nci.cabig.caaers.utils;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.List;

import gov.nih.nci.cabig.caaers.domain.Retireable;
import gov.nih.nci.cabig.ctms.domain.DomainObject;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.thoughtworks.xstream.XStream;

/**
 * This class uses XStream & serialize's contents of ObjectToSerialize class.
 * @author Monish
 *
 */
public class CaaersSerializerUtil {

    private static Log logger = LogFactory.getLog(CaaersSerializerUtil.class);
    public static final String CATALINA_HOME = System.getenv("CATALINA_HOME");
    public static final String USER_HOME = System.getProperty("user.home");

    /**
     * This method serializes Entities in the ObjectToSerialize. This class contains HttpRequest,HttpSession,HibernateSession & Exception.
     * @param objectToSerialize
     * @return
     */
    public static String serialize(ObjectToSerialize objectToSerialize) {
        String serializedContent = "";

        try {
            if (objectToSerialize != null) {
                XStream xstream = new XStream();
                xstream.registerConverter(new ObjectToSerializeConverter());
                xstream.setMode(XStream.ID_REFERENCES);
                serializedContent = xstream.toXML(objectToSerialize);
                if (!StringUtils.isEmpty(serializedContent)) {
                    dumpContentToFile(serializedContent);
                }
            }
        } catch (Exception e) {
            logger.error("Exception while serializing --", e);
        }
        return serializedContent;
    }

    /**
     * This method writes given content to a xml file. Location of the file is $CATALINA_HOME/logs/serializedfiles/
     * @param serializedContent
     */
    public static void dumpContentToFile(String content) {
        BufferedWriter out = null;
        StringBuilder sb = null;
        try {
            if (StringUtils.isEmpty(CATALINA_HOME)) {
                sb = new StringBuilder(USER_HOME);
            } else {
                sb = new StringBuilder(System.getenv("CATALINA_HOME"));
                sb.append("/logs");
            }
            sb.append("/serializedfiles");
            File file = new File(sb.toString());
            if (!file.isDirectory()) {
                file.mkdir();
            }
            sb.append("/session_").append(System.currentTimeMillis()).append(".xml");
            out = new BufferedWriter(new FileWriter(sb.toString()));
            out.write(content);
        } catch (Exception e) {
            logger.error("Exception while writing contect to file -- ", e);
        } finally {
            try {
                out.close();
            } catch (Exception e) {
            }
        }
    }

    /**
     * Will filter off retired objects from teh input l
     * @param l
     * @param <T>
     * @return
     */
    public static <T extends DomainObject> List<T> filter(List<T> l) {
        if (l == null)
            return l;
        List<T> l2 = new ArrayList<T>(l.size());
        for (T t : l) {
            if (t instanceof Retireable) {
                if (((Retireable) t).isRetired())
                    continue;
            }
            l2.add(t);
        }
        return l2;
    }

}