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/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.faces.view;
import static java.util.Collections.emptyList;
import java.util.List;
import jakarta.faces.FacesWrapper;
/**
*
* ViewDeclarationLanguageFactory is a factory object
* that creates (if needed) and returns a new {@link ViewDeclarationLanguage} instance based on the VDL found in a
* specific view.
*
*
*
*
*
* There must be one ViewDeclarationLanguageFactory instance per web application that is utilizing Jakarta
* Server Faces. This instance can be acquired, in a portable manner, by calling:
*
*
*
*
* ViewDeclarationLanguageFactory factory = (ViewDeclarationLanguageFactory)
* FactoryFinder.getFactory(FactoryFinder.VIEW_DECLARATION_LANGUAGE_FACTORY);
*
*
*
*
*
*
*
* Usage: extend this class and push the implementation being wrapped to the constructor and use {@link #getWrapped} to
* access the instance being wrapped.
*
*
* @since 2.0
*/
public abstract class ViewDeclarationLanguageFactory implements FacesWrapper {
private ViewDeclarationLanguageFactory wrapped;
/**
* @deprecated Use the other constructor taking the implementation being wrapped.
*/
@Deprecated
public ViewDeclarationLanguageFactory() {
}
/**
*
* 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.
*
*
* @param wrapped The implementation being wrapped.
*/
public ViewDeclarationLanguageFactory(ViewDeclarationLanguageFactory wrapped) {
this.wrapped = wrapped;
}
/**
*
* If this factory has been decorated, the implementation doing the decorating may override this method to provide
* access to the implementation being wrapped.
*
*/
@Override
public ViewDeclarationLanguageFactory getWrapped() {
return wrapped;
}
/**
*
* Return the ViewDeclarationLanguage instance suitable for
* handling the VDL contained in the page referenced by the argument viewId. The default implementation
* must return a valid ViewDeclarationLanguage instance for views written in either Jakarta Server Pages,
* Faces XML Views, or Facelets for Jakarta Server Faces 2.
*
*
* @param viewId the viewId to be inspected for an appropriate ViewDeclarationLanguage implementation for
* the VDL used in the view.
*
* @since 2.0
*
* @throws NullPointerException if viewId is null.
*
* @return the {@code ViewDeclarationLanguage} corresponding to the argument {@code viewId}
*
*/
public abstract ViewDeclarationLanguage getViewDeclarationLanguage(String viewId);
public List getAllViewDeclarationLanguages() {
return emptyList();
}
}