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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
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/*
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 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * 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
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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package com.sun.faces.facelets.tag.jsf;

import com.sun.faces.facelets.tag.MetaRulesetImpl;
import com.sun.faces.util.Util;

import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.component.ValueHolder;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.view.AttachedObjectHandler;
import javax.faces.view.facelets.*;
import java.io.IOException;


/**
 *
 * @author edburns
 */
public class ConverterTagHandlerDelegateImpl extends TagHandlerDelegate implements AttachedObjectHandler {

    private ConverterHandler owner;
    
    public ConverterTagHandlerDelegateImpl(ConverterHandler owner) {
        this.owner = owner;
    }
    
    @Override
    public void apply(FaceletContext ctx, UIComponent parent)
            throws IOException {
        // only process if it's been created
        if (parent == null || !(parent.getParent() == null)) {
            return;
        }
        ComponentSupport.copyPassthroughAttributes(ctx, parent, owner.getTag());
        if (parent instanceof ValueHolder) {
            owner.applyAttachedObject(ctx.getFacesContext(), parent);
        } else if (UIComponent.isCompositeComponent(parent)) {
            if (null == owner.getFor()) {
                // PENDING(): I18N
                throw new TagException(owner.getTag(),
                        "converter tags nested within composite components must have a non-null \"for\" attribute");
            }
            // Allow the composite component to know about the target
            // component.
            CompositeComponentTagHandler.getAttachedObjectHandlers(parent).add(owner);
        } else {
            throw new TagException(owner.getTag(),
                    "Parent not an instance of ValueHolder: " + parent);
        }
    }
    
    public MetaRuleset createMetaRuleset(Class type) {
        Util.notNull("type", type);
        MetaRuleset m = new MetaRulesetImpl(owner.getTag(), type);

        return m.ignore("binding").ignore("for");
    }
    
    public String getFor() {
        String result = null;
        TagAttribute attr = owner.getTagAttribute("for");
        
        if (null != attr) {
            if (attr.isLiteral()) {
                result = attr.getValue();
            } else {
                FacesContext context = FacesContext.getCurrentInstance();
                FaceletContext ctx = (FaceletContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);
                result = (String)attr.getValueExpression(ctx, String.class).getValue(ctx);
            }
        }
        return result;
        
    }
    
    public void applyAttachedObject(FacesContext context, UIComponent parent) {
        FaceletContext ctx = (FaceletContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);
        // cast to a ValueHolder
        ValueHolder vh = (ValueHolder) parent;
        ValueExpression ve = null;
        Converter c = null;
        if (owner.getBinding() != null) {
            ve = owner.getBinding().getValueExpression(ctx, Converter.class);
            c = (Converter) ve.getValue(ctx);
        }
        if (c == null) {
            c = this.createConverter(ctx);
            if (ve != null) {
                ve.setValue(ctx, c);
            }
        }
        if (c == null) {
            throw new TagException(owner.getTag(), "No Converter was created");
        }
        owner.setAttributes(ctx, c);
        vh.setConverter(c);
        Object lv = vh.getLocalValue();
        FacesContext faces = ctx.getFacesContext();
        if (lv instanceof String) {
            vh.setValue(c.getAsObject(faces, parent, (String) lv));
        }
    }

    /**
     * Create a Converter instance
     * 
     * @param ctx
     *            FaceletContext to use
     * @return Converter instance, cannot be null
     */
    private Converter createConverter(FaceletContext ctx) {
        if (owner.getConverterId(ctx) == null) {
            throw new TagException(
                    owner.getTag(),
                    "Default behavior invoked of requiring a converter-id passed in the constructor, must override ConvertHandler(ConverterConfig)");
        }
        return ctx.getFacesContext().getApplication().createConverter(owner.getConverterId(ctx));
    }

    

}