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EE4J Compatible Implementation for Jakarta Faces API

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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 com.sun.faces.facelets.tag.jstl.core;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.sun.faces.facelets.tag.TagHandlerImpl;

import jakarta.faces.component.UIComponent;
import jakarta.faces.view.facelets.FaceletContext;
import jakarta.faces.view.facelets.TagConfig;
import jakarta.faces.view.facelets.TagException;

/**
 * @author Jacob Hookom
 */
public final class ChooseHandler extends TagHandlerImpl {

    private final ChooseOtherwiseHandler otherwise;
    private final ChooseWhenHandler[] when;

    public ChooseHandler(TagConfig config) {
        super(config);

        List whenList = new ArrayList();
        Iterator itr = this.findNextByType(ChooseWhenHandler.class);
        while (itr.hasNext()) {
            whenList.add(itr.next());
        }
        if (whenList.isEmpty()) {
            throw new TagException(tag, "Choose Tag must have one or more When Tags");
        }
        when = (ChooseWhenHandler[]) whenList.toArray(new ChooseWhenHandler[whenList.size()]);

        itr = this.findNextByType(ChooseOtherwiseHandler.class);
        if (itr.hasNext()) {
            otherwise = (ChooseOtherwiseHandler) itr.next();
        } else {
            otherwise = null;
        }
    }

    @Override
    public void apply(FaceletContext ctx, UIComponent parent) throws IOException {
        for (int i = 0; i < when.length; i++) {
            if (when[i].isTestTrue(ctx)) {
                when[i].apply(ctx, parent);
                return;
            }
        }
        if (otherwise != null) {
            otherwise.apply(ctx, parent);
        }
    }

}