org.openxdata.server.service.impl.SerializationServiceImpl.java Source code

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Here is the source code for org.openxdata.server.service.impl.SerializationServiceImpl.java

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/*
 *  Licensed to the OpenXdata Foundation (OXDF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The OXDF licenses this file to You 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.
 *
 *  Copyright 2010 http://www.openxdata.org.
 */
package org.openxdata.server.service.impl;

import org.openxdata.server.OpenXDataConstants;
import org.openxdata.server.dao.SettingDAO;
import org.openxdata.server.serializer.DefaultXformSerializer;
import org.openxdata.server.serializer.StudySerializer;
import org.openxdata.server.serializer.UserSerializer;
import org.openxdata.server.serializer.XformSerializer;
import org.openxdata.server.service.SerializationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * @author Angel
 *
 */
@Transactional
@Service("serializationService")
public class SerializationServiceImpl implements SerializationService {

    @Autowired
    private SettingDAO settingDAO;

    public SerializationServiceImpl() {
    }

    /**
     * @param settingDAO
     */
    public SerializationServiceImpl(SettingDAO settingDAO) {
        this.settingDAO = settingDAO;
    }

    /**
      * Gets the value of data stream serializer.
      * 
      * @param name the name of the setting that points to the class
      * @param settingName the default name of the setting to use in case null is passed for the first parameter.
      * @param defaultValue the default value to return incase no setting with the given name exists.
      * @return the class name including its full pack.
      * 
      * @throws InstantiationException If the specified Serializer could not be loaded.
      */
    private Object getSerializer(String name, String settingName, String defaultValue)
            throws InstantiationException {
        String key = name;
        if (key == null || key.trim().length() == 0)
            key = settingName;

        String serializer = settingDAO.getSetting(key, defaultValue);
        try {
            Object obj = Class.forName(serializer).newInstance();
            return obj;
        } catch (Exception e) {
            throw new InstantiationException();
        }
    }

    @Override
    public XformSerializer getFormSerializer(String name) {
        try {
            Object serializer = getSerializer(name, OpenXDataConstants.SETTING_NAME_FORM_SERIALIZER,
                    OpenXDataConstants.DEFAULT_FORM_SERIALIZER);
            if (serializer instanceof XformSerializer)
                return (XformSerializer) serializer;
        } catch (InstantiationException e) {
            // do nothing
        }

        return new DefaultXformSerializer();

    }

    @Override
    public UserSerializer getUserSerializer(String name) {
        try {
            Object serializer = getSerializer(name, OpenXDataConstants.SETTING_NAME_USER_SERIALIZER,
                    OpenXDataConstants.DEFAULT_USER_SERIALIZER);
            if (serializer instanceof UserSerializer)
                return (UserSerializer) serializer;
        } catch (InstantiationException e) {
            // do nothing
        }
        return new DefaultXformSerializer();
    }

    @Override
    public StudySerializer getStudySerializer(String name) {
        try {
            Object serializer = getSerializer(name, OpenXDataConstants.SETTING_NAME_STUDY_SERIALIZER,
                    OpenXDataConstants.DEFAULT_STUDY_SERIALIZER);
            if (serializer instanceof StudySerializer)
                return (StudySerializer) serializer;
        } catch (InstantiationException e) {
            // do nothing
        }
        return new DefaultXformSerializer();
    }

}