package jaction.utility;


import java.io.Serializable;



public abstract class MessageResourcesFactory implements Serializable {


    // ---------------------------------------------------- Instance Properties


    /**
     * The "return null" property value to which newly created
     * MessageResourcess should be initialized.
     */
    protected boolean returnNull = true;

    public boolean getReturnNull() {
        return (this.returnNull);
    }

    public void setReturnNull(boolean returnNull) {
        this.returnNull = returnNull;
    }


    // --------------------------------------------------------- Public Methods


    /**
     * Create and return a newly instansiated <code>MessageResources</code>.
     * This method must be implemented by concrete subclasses.
     *
     * @param config Configuration parameter(s) for the requested bundle
     */
    public abstract MessageResources createResources(String config);


    // ------------------------------------------------------ Static Properties


    /**
     * The Java class to be used for
     * <code>MessageResourcesFactory</code> instances.
     */
    protected static transient Class clazz = null;


    /**
     * The fully qualified class name to be used for
     * <code>MessageResourcesFactory</code> instances.
     */
    protected static String factoryClass =
        "jaction.utility.PropertyMessageResourcesFactory";

    public static String getFactoryClass() {
        return (MessageResourcesFactory.factoryClass);
    }

    public static void setFactoryClass(String factoryClass) {
        MessageResourcesFactory.factoryClass = factoryClass;
        MessageResourcesFactory.clazz = null;
    }


    // --------------------------------------------------------- Static Methods


    /**
     * Create and return a <code>MessageResourcesFactory</code> instance of the
     * appropriate class, which can be used to create customized
     * <code>MessageResources</code> instances.  If no such factory can be
     * created, return <code>null</code> instead.
     */
    public static MessageResourcesFactory createFactory() {

        // Construct a new instance of the specified factory class
        try {
            if (clazz == null)
                clazz = Class.forName(factoryClass);
            MessageResourcesFactory factory =
                (MessageResourcesFactory) clazz.newInstance();
            return (factory);
        } catch (Throwable t) {
            System.out.println("MessageResourcesFactory.createFactory");
            t.printStackTrace(System.out);
            return (null);
        }

    }


}