ApplicationFactory.java

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package javax.faces.application;

import javax.faces.FacesWrapper;

/**
 * <p>
 * <strong class="changed_modified_2_0 changed_modified_2_3">ApplicationFactory</strong> is a
 * factory object that creates (if needed) and returns {@link Application} instances.
 * Implementations of JavaServer Faces must provide at least a default implementation of
 * {@link Application}.
 * </p>
 *
 * <p>
 * There must be one {@link ApplicationFactory} instance per web application that is utilizing
 * JavaServer Faces. This instance can be acquired, in a portable manner, by calling:
 * </p>
 * 
 * <pre>
 * ApplicationFactory factory = (ApplicationFactory) FactoryFinder.getFactory(FactoryFinder.APPLICATION_FACTORY);
 * </pre>
 *
 * <p class="changed_added_2_3">
 * Usage: extend this class and push the implementation being wrapped to the constructor and use
 * {@link #getWrapped} to access the instance being wrapped.
 * </p>
 */

public abstract class ApplicationFactory implements FacesWrapper<ApplicationFactory> {

    private ApplicationFactory wrapped;

    /**
     * @deprecated Use the other constructor taking the implementation being wrapped.
     */
    @Deprecated
    public ApplicationFactory() {

    }

    /**
     * <p class="changed_added_2_3">
     * If this factory has been decorated, the implementation doing the decorating should push the
     * implementation being wrapped to this constructor. The {@link #getWrapped()} will then return
     * the implementation being wrapped.
     * </p>
     *
     * @param wrapped The implementation being wrapped.
     */
    public ApplicationFactory(ApplicationFactory wrapped) {
        this.wrapped = wrapped;
    }

    /**
     * <p class="changed_modified_2_3">
     * If this factory has been decorated, the implementation doing the decorating may override this
     * method to provide access to the implementation being wrapped.
     * </p>
     *
     * @since 2.0
     */
    @Override
    public ApplicationFactory getWrapped() {
        return wrapped;
    }

    /**
     * <p>
     * Create (if needed) and return an {@link Application} instance for this web application.
     * </p>
     *
     * @return the application.
     */
    public abstract Application getApplication();

    /**
     * <p>
     * Replace the {@link Application} instance that will be returned for this web application.
     * </p>
     *
     * @throws NullPointerException if <code>application</code> is <code>null</code>.
     * 
     * @param application The replacement {@link Application} instance
     */
    public abstract void setApplication(Application application);

}