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Jakarta Faces defines an MVC framework for building user interfaces for web applications, including UI components, state management, event handing, input validation, page navigation, and support for internationalization and accessibility.

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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 java.util.List;

import jakarta.faces.component.UIComponent;

/**
 * 
 * Within the declaration of a composite component, an AttachedObjectTarget allows the
 * composite component author to expose the semantics of an inner component to the page author without
 * exposing the rendering or implementation details of the inner component. See
 * {@link ViewDeclarationLanguage#getComponentMetadata} for the context in which implementations of this interface are
 * used.
 * 
 *
 * 
 * The implementation must ensure that this instance is thread safe and may be shared among different component trees.
 * 
 *
 * 
 *
 * 
 * Subinterfaces are provided for the common behavioral interfaces: {@link jakarta.faces.component.behavior.Behavior},
 * {@link jakarta.faces.component.ValueHolder}, {@link jakarta.faces.component.EditableValueHolder} and
 * {@link jakarta.faces.component.ActionSource}. The default VDL implementation must provide a corresponding Facelets
 * tag handler for each of the subinterfaces of this interface.
 * 
 *
 * 
 *
 * @since 2.0
 */
public interface AttachedObjectTarget {

    /**
     * 
     * The key in the value set of the composite component BeanDescriptor, the value for which is a
     * List<AttachedObjectTarget>.
     * 
     */
    String ATTACHED_OBJECT_TARGETS_KEY = "jakarta.faces.view.AttachedObjectTargets";

    /**
     * 
     * Returns the List<UIComponent> that this AttachedObjectTarget exposes. Each
     * attached object exposed by the composite component author may point at multiple
     * UIComponent instances within the composite component. This method is used by the
     * {@link jakarta.faces.view.ViewDeclarationLanguage#retargetAttachedObjects} method to take the appropriate action on
     * the attached object.
     * 
     *
     * @param topLevelComponent the top level component for this composite component.
     *
     * @return the result as specified above
     *
     */
    List getTargets(UIComponent topLevelComponent);

    /**
     * 
     * Returns the name by which this attached object target is exposed to the page author.
     * 
     *
     *
     * @return the name of the attached object target
     *
     */
    String getName();

}