configurator.java

来自「一个java 代码生成器」· Java 代码 · 共 148 行

/**
 * Copyright (c) 2002, Siddhartha P. Chandurkar [e-mail]
 * All rights reserved.
 * Licensed under the Academic Free License version 1.1
 * See the file LICENSE.TXT for details.
 * LICENSE.txt is located in the directory  <install-directory>\Jenerator
 * of your Jenertaor Installation.
 *
 */

package com.jenerator.util;

//<Imports>

import com.jenerator.struct.ConfigStructs;
import com.jenerator.struct.app.AppConfigStructFiller;
import com.jenerator.struct.ejb.EjbStructFiller;
import com.jenerator.struct.pattern.PatternStructFiller;
import com.jenerator.struct.views.ViewStructFiller;
import org.apache.log4j.Logger;

import java.io.File;

//</Imports>

/**
 * Configurator
 * This is a singleton class which holds all the configuration parameters needed
 * for the application. It is the single place from where all the classes should access
 * any type of configurable parameter. It minimizes the need to read the configuration
 * file everytime when one needs any value. I call it the <i>Configurator Pattern</i>.
 * It uses the GenericXmlParser to parse the XML files
 * @author Siddhartha P. Chandurkar
 * @version 0.1.o
 * @see GenericXmlParser
 *
 */
public class Configurator {

    //ATTRIBUTES
    // The Configurator singleton instance
    private static Configurator _instance;
    //The jenerator home e.g. C:\app\Jenerator
    private String jenHome;
    //The datastructure which will contain all the configurations
    private ConfigStructs configStructs;
    //The log4j logger for this class
    private Logger log = Logger.getLogger(com.jenerator.util.Configurator.class.getName());


    //CONSTRUCTORS
    /**
     * Configurator
     * It instantiates an empty ConfigStructs data structure
     */
    private Configurator() {
        configStructs = new ConfigStructs();
    }

    /**
     * getInstance
     * Method which returns the singleton instance of the configurator
     */
    public static Configurator getInstance() {
        if (_instance == null)
            _instance = new Configurator();
        return _instance;
    }

    //Get /  Set methods
    public String getJenHome() {
        return jenHome;
    }

    public void setJenHome(String _jenHome) {
        jenHome = _jenHome;
    }


    public ConfigStructs getConfigStructs() {
        return configStructs;
    }

    /**
     * readConfiguration
     * This method reads all the XML desriptor files i.e. config.xml and jen-desc.xml
     * @param   boolean bDesc   Whether the Jenerator descriptor file has to be read
     */
    public void readConfiguration(ArgumentParser argParser) throws ConfigurationException {
        try {


            if (argParser.isDesc()) {

                GenericXmlParser parser = new GenericXmlParser(new AppConfigStructFiller(), getJenHome() + File.separator + "config" + File.separator + "config.xml");
                parser.setRootParseElement("config");
                parser.parse();

                //Reading the SQL2JAVA Mappings
                configStructs.setSql2JavaMappings((new PropertyReader(getJenHome() + File.separator + "config" + File.separator + "SQL2JAVA.properties")).getProperties());
                log.debug("READING DONE");

            } else if (argParser.isPATTERN()) {
                GenericXmlParser parser = new GenericXmlParser(new AppConfigStructFiller(), getJenHome() + File.separator + "config" + File.separator + "config.xml");
                parser.setRootParseElement("config");
                parser.parse();
                parser = new GenericXmlParser(new PatternStructFiller(), getJenHome() + File.separator + "config" + File.separator + "patterns.xml");
                parser.setRootParseElement("gof-pattern");
                parser.parse();
                parser.setRootParseElement("ejb-pattern");
                parser.parse();
            } else if (argParser.isSERVLET()) {
                GenericXmlParser parser = new GenericXmlParser(new AppConfigStructFiller(), getJenHome() + File.separator + "config" + File.separator + "config.xml");
                parser.setRootParseElement("config");
                parser.parse();
                parser = new GenericXmlParser(new ViewStructFiller(), getJenHome() + File.separator + "config" + File.separator + "views.xml");
                parser.setRootParseElement("servlet");
                parser.parse();
            } else {
                try {
                    GenericXmlParser parser = new GenericXmlParser(new AppConfigStructFiller(), getJenHome() + File.separator + "config" + File.separator + "config.xml");
                    parser.setRootParseElement("config");
                    parser.parse();
                    parser = new GenericXmlParser(new EjbStructFiller(), getConfigStructs().getAppConfigStruct().getGenDir() + File.separator + "JEN-INF" + File.separator + "jen-desc.xml");
                    parser.setRootParseElement("entity");
                    parser.parse();
                    parser.setRootParseElement("session");
                    parser.parse();
                    parser.setRootParseElement("message-driven-bean");
                    parser.parse();
                } catch (ConfigurationException e) {
                    log.fatal("The jen-desc.xml file has to be generated before using the options r,b,h,c. \nRun the Jenerator with the -d option first");
                    throw e;
                }

            }


        } catch (ConfigurationException e) {
            log.fatal(e);
            throw e;
        }


    }//readConfiguratin


}//Configurator