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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.tag;

import javax.faces.view.facelets.CompositeFaceletHandler;
import javax.faces.view.facelets.FaceletHandler;
import javax.faces.view.facelets.TagConfig;
import javax.faces.view.facelets.TagHandler;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 *
 * @author edburns
 */
public abstract class TagHandlerImpl extends TagHandler {

    public TagHandlerImpl(TagConfig config) {
        super(config);
    }
    
    /**
     * Searches child handlers, starting at the 'nextHandler' for all
     * instances of the passed type.  This process will stop searching
     * a branch if an instance is found.
     * 
     * @param type Class type to search for
     * @return iterator over instances of FaceletHandlers of the matching type
     */
    protected final Iterator findNextByType(Class type) {
        List found = new ArrayList();
        if (type.isAssignableFrom(this.nextHandler.getClass())) {
            found.add(this.nextHandler);
        } else if (this.nextHandler instanceof CompositeFaceletHandler) {
            FaceletHandler[] h = ((CompositeFaceletHandler) this.nextHandler).getHandlers();
            for (int i = 0; i < h.length; i++) {
                if (type.isAssignableFrom(h[i].getClass())) {
                    found.add(h[i]);
                }
            }
        }
        return found.iterator();
    }
    
    public final static Iterator findNextByType(FaceletHandler nextHandler,
            Class type) {
        List found = new ArrayList();
        if (type.isAssignableFrom(nextHandler.getClass())) {
            found.add(nextHandler);
        } else if (nextHandler instanceof CompositeFaceletHandler) {
            FaceletHandler[] h = ((CompositeFaceletHandler) nextHandler).getHandlers();
            for (int i = 0; i < h.length; i++) {
                if (type.isAssignableFrom(h[i].getClass())) {
                    found.add(h[i]);
                }
            }
        }
        return found.iterator();
        
    }

}