efieldtransformfactory.java

CRM源码This file describes some issues that should be implemented in future and how it should be imple

/*
 * Copyright 2006-2007 Queplix Corp.
 *
 * Licensed under the Queplix Public License, Version 1.1.1 (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.queplix.com/solutions/commercial-open-source/queplix-public-license/
 *
 * 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 com.queplix.core.modules.eqlext.transforms;

import com.queplix.core.error.GenericSystemException;
import com.queplix.core.jxb.entity.Efield;
import com.queplix.core.utils.dao.AbstractPropertyFactory;

import java.io.InputStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Properties;

/**
 * <p>Factory class for working with transform classes</p>
 * @author [ALB] Baranov Andrey
 * @version $Revision: 1.2 $ $Date: 2005/10/26 14:03:51 $
 */

public class EfieldTransformFactory
    implements java.io.Serializable {

// ----------------------- VARIABLES -----------------------

    private static final String FILE_NAME = "transform.properties";
    private static Class CLASS = EfieldTransformFactory.class;

    private static final HashMap transformMap = new HashMap();

    static {

        InputStream is = AbstractPropertyFactory.loadSysPropertiesAsStream( CLASS, FILE_NAME );
        Properties props = new Properties();

        try {
            // load properties
            props.load( is );

            // instantiate transforms
            Enumeration en = props.keys();
            while( en.hasMoreElements() ) {
                String name = ( String ) en.nextElement();
                String className = props.getProperty( name );

                EfieldTransform transform = ( EfieldTransform ) Class.forName( className ).newInstance();
                transformMap.put( name, transform );
            }

        } catch( Exception ex ) {
            ex.printStackTrace();
            throw new GenericSystemException( ex );
        }
    }

// --------------------- PUBLIC METHODS --------------------

    /**
     * Get EfieldTransform object
     * @param efield Efield object
     * @return transform object
     */
    public static EfieldTransform getEfieldTransform( Efield efield ) {

        // is field selectable?
        if( !efield.getSelectable().booleanValue() ) {
            return null;
        }

        String transformName = efield.getTransform();
        if( transformName == null ) {
            // try to get default transformer
            String datatype = efield.getDatatype().toString();
            transformName = datatype;
        }

        return getEfieldTransform( transformName );
    }

// ------------------- PRIVATE METHODS ---------------------

    /**
     * Constructor
     */
    private EfieldTransformFactory() {}

    /**
     * Get EfieldTransform object
     * @param name transform name
     * @return new transform object
     */
    private static EfieldTransform getEfieldTransform( String name ) {

        try {
            return( EfieldTransform ) transformMap.get( name );

        } catch( Exception ex ) {
            throw new GenericSystemException( "Can't load transform object '" +
                                              name + "' from properties '" +
                                              FILE_NAME + "'", ex );
        }
    }
}