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EE4J Compatible Implementation for Jakarta Faces API
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/*
 * Copyright (c) 1997, 2018 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 com.sun.faces.application;

import com.sun.faces.application.view.JspStateManagementStrategy;
import java.io.IOException;
import java.util.Map;
import javax.faces.application.StateManager;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.render.RenderKit;
import javax.faces.render.ResponseStateManager;
import javax.faces.view.StateManagementStrategy;
import javax.faces.view.ViewDeclarationLanguage;

/**
 * 
 * A StateManager implementation to meet the requirements of the specification.
 * 
 */
public class StateManagerImpl extends StateManager {

    /**
     * Save the view.
     *
     * @param context the Faces context.
     * @return the saved view.
     */
    @Override
    public Object saveView(FacesContext context) {
        Object result = null;

        if (context != null && !context.getViewRoot().isTransient()) {
            UIViewRoot viewRoot = context.getViewRoot();
            StateManagementStrategy strategy = null;
            String viewId = viewRoot.getViewId();

            ViewDeclarationLanguage vdl = context.getApplication().getViewHandler().getViewDeclarationLanguage(context, viewId);

            if (vdl != null) {
                strategy = vdl.getStateManagementStrategy(context, viewId);
            }

            Map contextAttributes = context.getAttributes();

            try {
                contextAttributes.put(StateManager.IS_SAVING_STATE, Boolean.TRUE);

                if (strategy != null) {
                    result = strategy.saveView(context);
                } else {
                    strategy = new JspStateManagementStrategy(context);
                    result = strategy.saveView(context);
                }
            } finally {
                contextAttributes.remove(StateManager.IS_SAVING_STATE);
            }
        }

        return result;
    }

    /**
     * Write out the state.
     *
     * @param context the Faces context.
     * @param state the state.
     * @throws IOException when an I/O error occurs.
     */
    @Override
    public void writeState(FacesContext context, Object state) throws IOException {
        RenderKit rk = context.getRenderKit();
        ResponseStateManager rsm = rk.getResponseStateManager();
        rsm.writeState(context, state);
    }

    /**
     * Restores the view.
     * 
     * @param context the Faces context.
     * @param viewId the view id.
     * @param renderKitId the render kit id.
     * @return the view root.
     * @see StateManager#restoreView(javax.faces.context.FacesContext, java.lang.String,
     *      java.lang.String)
     */
    @Override
    public UIViewRoot restoreView(FacesContext context, String viewId, String renderKitId) {
        UIViewRoot result;
        StateManagementStrategy strategy = null;

        ViewDeclarationLanguage vdl = context.getApplication().getViewHandler().getViewDeclarationLanguage(context, viewId);

        if (vdl != null) {
            strategy = vdl.getStateManagementStrategy(context, viewId);
        }

        if (strategy != null) {
            result = strategy.restoreView(context, viewId, renderKitId);
        } else {
            strategy = new JspStateManagementStrategy(context);
            result = strategy.restoreView(context, viewId, renderKitId);
        }

        return result;
    }
}