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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.facelets.compiler;

import com.sun.faces.RIConstants;
import javax.faces.component.UIComponent;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.FaceletHandler;
import java.io.IOException;
import java.util.Map;
import javax.faces.context.FacesContext;

public class EncodingHandler implements FaceletHandler {

    private final FaceletHandler next;
    private final String encoding;
    private final CompilationMessageHolder messageHolder;
    
    public EncodingHandler(FaceletHandler next, String encoding,
            CompilationMessageHolder messageHolder) {
        this.next = next;
        this.encoding = encoding;
        this.messageHolder = messageHolder;
    }

    @Override
    public void apply(FaceletContext ctx, UIComponent parent)
            throws IOException {
        FacesContext context = ctx.getFacesContext();
        Map ctxAttributes = context.getAttributes();
        ctxAttributes.put("facelets.compilationMessages", this.messageHolder);
        this.next.apply(ctx, parent);
        ctxAttributes.remove("facelets.compilationMessages");
        this.messageHolder.processCompilationMessages(ctx.getFacesContext());
        if (!ctxAttributes.containsKey(RIConstants.FACELETS_ENCODING_KEY)) {
            ctx.getFacesContext().getAttributes().put(RIConstants.FACELETS_ENCODING_KEY, this.encoding);
        }
    }
    
    public static CompilationMessageHolder getCompilationMessageHolder(FaceletContext ctx) {

        return (CompilationMessageHolder) ctx.getFacesContext().getAttributes().get("facelets.compilationMessages");

    }

}