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 *
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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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package javax.faces.view.facelets;

import java.io.IOException;
import javax.el.ELException;
import javax.faces.FacesException;
import javax.faces.FactoryFinder;
import javax.faces.component.UIComponent;

/**
 * Enable the JSF
 * implementation to provide the appropriate behavior for the kind of
 * {@link MetaTagHandler} subclass for each kind of element in the view,
 * while providing a base-class from which those wanting to make a Java
 * language custom tag handler can inherit.  The JSF runtime provides
 * the implementation of {@link #getTagHandlerDelegate} for the
 * appropriate subclass.
 */

public abstract class DelegatingMetaTagHandler extends MetaTagHandler {
    
    private final TagAttribute binding;

    private final TagAttribute disabled;
    
    protected TagHandlerDelegateFactory delegateFactory;
    
    public DelegatingMetaTagHandler(TagConfig config) {
        super(config);
        this.binding = this.getAttribute("binding");
        this.disabled = this.getAttribute("disabled");
        delegateFactory = (TagHandlerDelegateFactory)
                FactoryFinder.getFactory(FactoryFinder.TAG_HANDLER_DELEGATE_FACTORY);
    }
    
    protected abstract TagHandlerDelegate getTagHandlerDelegate();
    
    // Properties ----------------------------------------

    public boolean isDisabled(FaceletContext ctx) {
        return disabled != null && Boolean.TRUE.equals(disabled.getBoolean(ctx));
    }
    
    public TagAttribute getBinding() {
        return this.binding;
    }
    
    public Tag getTag() {
        return this.tag;
    }
    
    public String getTagId() {
        return this.tagId;
    }
    
    public TagAttribute getTagAttribute(String localName) {
        return super.getAttribute(localName);
    }
    
    @Override
    public void setAttributes(FaceletContext ctx, Object instance) {
        super.setAttributes(ctx, instance);
    }
    
    // Methods ----------------------------------------
    

    /**
     * The default implementation simply
     * calls through to {@link TagHandlerDelegate#apply}.
     *
     * @param ctx the FaceletContext for this view execution
     *
     * @param parent the parent UIComponent of the
     * component represented by this element instance.
     * @since 2.0
     */

    public void apply(FaceletContext ctx, UIComponent parent) throws IOException {
        getTagHandlerDelegate().apply(ctx, parent);
    }
    
    /**
     * Invoke the apply()
     * method on this instance's {@link TagHandler#nextHandler}.
     *
     * @param ctx the FaceletContext for this view execution
     *
     * @param c the UIComponent of the
     * component represented by this element instance.
     * @since 2.0
     */

    public void applyNextHandler(FaceletContext ctx, UIComponent c) 
            throws IOException, FacesException, ELException {
        // first allow c to get populated
        this.nextHandler.apply(ctx, c);
    }
    
    /**
     * The default implementation simply
     * calls through to {@link TagHandlerDelegate#createMetaRuleset} and
     * returns the result.
     *
     * @param type the Class for which the
     * MetaRuleset must be created.
     *
     * @since 2.0
     */

    @Override
    protected MetaRuleset createMetaRuleset(Class type) {
        return getTagHandlerDelegate().createMetaRuleset(type);
    }
    
}