homepagetypes.java

java 写的一个新闻发布系统

//
//                                   ____.
//                       __/\ ______|    |__/\.     _______
//            __   .____|    |       \   |    +----+       \
//    _______|  /--|    |    |    -   \  _    |    :    -   \_________
//   \\______: :---|    :    :           |    :    |         \________>
//           |__\---\_____________:______:    :____|____:_____\
//                                      /_____|
//
//                 . . . i n   j a h i a   w e   t r u s t . . .
//
//
// NK - 17 Dec. 2001 :
//

package org.jahia.services.homepages;

import java.util.Hashtable;

/**
 * Map Homepage classes to homepage types.
 *
 * @author Khue ng
 * @version 1.0
 */
public class HomepageTypes {

	public static final int HOMEPAGE_LINK = 1;
	public static final int HOMEPAGE_COPY = 2;
	public static final int HOMEPAGE_NEW = 3;

    private static  HomepageTypes instance;
    private Hashtable types;
    private Hashtable typeLabels;
    private Hashtable classesNames;


	/**
	 * Constructor
	 */
    protected HomepageTypes()
    {
		types = new Hashtable();
		types.put("LINK",new Integer(HOMEPAGE_LINK));	
		types.put("COPY",new Integer(HOMEPAGE_COPY));	
		types.put("NEW",new Integer(HOMEPAGE_NEW));	

		typeLabels = new Hashtable();
		typeLabels.put(new Integer(HOMEPAGE_LINK),"LINK");	
		typeLabels.put(new Integer(HOMEPAGE_COPY),"COPY");	
		typeLabels.put(new Integer(HOMEPAGE_NEW),"NEW");	

        classesNames = new Hashtable();
        classesNames.put( new Integer(HOMEPAGE_LINK), "org.jahia.services.homepages.JahiaHomepageLink");
        classesNames.put( new Integer(HOMEPAGE_COPY), "org.jahia.services.homepages.JahiaHomepageCopy");
        classesNames.put( new Integer(HOMEPAGE_NEW), "org.jahia.services.homepages.JahiaHomepageNew");
    }

	/**
	 * Returns the simgle instance of this site
	 *
	 * @return HomepageTypes
	 */
    public static synchronized HomepageTypes getInstance()
    {
        if (instance == null) {
            instance = new HomepageTypes();
        }
        return instance;
    }

    /**
     * gets available homepage types
     *
     * @return Hashtable of homepage types
     */
    public Hashtable getTypes()
    {
        if ( types == null )
        	return null;
        
        /* Deactivate NEW and COPY	
        Hashtable hash = (Hashtable) types.clone();
        */
        Hashtable hash = new Hashtable();
		hash.put("LINK",new Integer(HOMEPAGE_LINK));	
        
        return hash;
    }

    /**
     * Return a type looking at its key
     *
     * @param String type key
     * @return int the type or -1 if not found
     */
    public int getType(String key)
    {
        if ( key == null )
        	return -1;
        	
        Integer type = (Integer) types.get(key);
        
        if ( type == null )
        	return -1;
        
        return type.intValue();
    }

    /**
     * Return a type's name ( readable value ).
     *
     * @param int the type value
     * @return String the type's name
     */
    public String getTypeName(int type)
    {
        Integer I = new Integer(type);
        String name = (String)typeLabels.get(I);

        if ( name == null )
        	return "UNKNOWN";
        
        return name;
    }


    /**
     * gets classesNames
     *
     * @return Hashtable of classes name
     */
    public Hashtable getClassesNames()
    {
        if ( classesNames == null )
        	classesNames = new Hashtable();
        	
        Hashtable hash = (Hashtable) classesNames.clone();
        return hash;
        
    }

}