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/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the License).  You may not use this file except in
 * compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * https://jsftemplating.dev.java.net/cddl1.html or
 * jsftemplating/cddl1.txt.
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * Header Notice in each file and include the License file 
 * at jsftemplating/cddl1.txt.  
 * If applicable, add the following below the CDDL Header, 
 * with the fields enclosed by brackets [] replaced by
 * you own identifying information: 
 * "Portions Copyrighted [year] [name of copyright owner]"
 * 
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 */
package com.sun.jsftemplating.layout.descriptors;

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

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

import com.sun.jsftemplating.component.ComponentUtil;
import com.sun.jsftemplating.layout.descriptors.handler.Handler;
import com.sun.jsftemplating.layout.descriptors.handler.HandlerContext;
import com.sun.jsftemplating.layout.descriptors.handler.HandlerDefinition;


/**
 *  	This class defines a LayoutMarkup.  A LayoutMarkup provides a means to
 *	start a markup tag and associate the current UIComponent with it for
 *	tool support.  It also has the benefit of properly closing the markup
 *	tag for you.
 *
 *  @author Ken Paulsen ([email protected])
 */
public class LayoutMarkup extends LayoutElementBase implements LayoutElement {
    private static final long serialVersionUID = 1L;

    /**
     *	 Constructor.
     */
    public LayoutMarkup(LayoutElement parent, String tag, String type) {
	super(parent, tag);
	_tag = tag;
	_type = type;

	// Add "afterEncode" handler to close the tag (if there is a close tag)
	if (!type.equals(TYPE_OPEN)) {
	    ArrayList handlers = new ArrayList();
	    handlers.add(afterEncodeHandler);
	    setHandlers(AFTER_ENCODE, handlers);
	}
    }

    /**
     *
     */
    public String getTag() {
	return _tag;
    }

    /**
     *
     */
    public String getType() {
	return _type;
    }

    /**
     *	 This method displays the text described by this component.  If the
     *	    text includes an EL expression, it will be evaluated.  It returns
     *	    true to render children.
     *
     *	@param	context	    The FacesContext
     *	@param	component   The UIComponent
     *
     *	@return	false
     */
    protected boolean encodeThis(FacesContext context, UIComponent component) throws IOException {
	if (getType().equals(TYPE_CLOSE)) {
	    return true;
	}

	// Get the ResponseWriter
	ResponseWriter writer = context.getResponseWriter();

	// Render...
	Object value = resolveValue(context, component, getTag());
	if (value != null) {
	    writer.startElement(value.toString(), component);
	}

	// Always render children
	return true;
    }

    /**
     *	 This handler takes care of closing the tag.
     *
     *	@param	context	The HandlerContext.
     */
    public static void afterEncodeHandler(HandlerContext context) throws IOException {
	FacesContext ctx = context.getFacesContext();
	ResponseWriter writer = ctx.getResponseWriter();
	LayoutMarkup markup = (LayoutMarkup) context.getLayoutElement();
	Object value = ComponentUtil.getInstance(ctx).resolveValue(ctx,
		markup, (UIComponent) context.getEventObject().getSource(),
		markup.getTag());
	if (value != null) {
	    writer.endElement(value.toString());
	}
    }

    /**
     *
     */
    public static final HandlerDefinition afterEncodeHandlerDef =
	new HandlerDefinition("_markupAfterEncode");

    /**
     *
     */
    public static final Handler afterEncodeHandler =
	new Handler(afterEncodeHandlerDef);

    static {
	afterEncodeHandlerDef.setHandlerMethod(
		LayoutMarkup.class.getName(), "afterEncodeHandler");
    }

    /**
     *	 This markup type writes out both the opening and closing tags.
     */
    public static final String TYPE_BOTH   =	"both";

    /**
     *	 This markup type writes out the closing tag.
     */
    public static final String TYPE_CLOSE   =	"close";

    /**
     *	 This markup type writes out the opening tag.
     */
    public static final String TYPE_OPEN   =	"open";

    private String _tag   = null;
    private String _type   = null;
}