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/*
 * Enhydra Java Application Server Project
 * 
 * The contents of this file are subject to the Enhydra Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License on
 * the Enhydra web site ( http://www.enhydra.org/ ).
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See 
 * the License for the specific terms governing rights and limitations
 * under the License.
 * 
 * The Initial Developer of the Original Code is DigitalSesame
 * Portions created by DigitalSesame are Copyright (C) 1997-2000 DigitalSesame
 * All Rights Reserved.
 * 
 * Contributor(s):
 * 
 * $Id: WMLDomFactory.java,v 1.2 2005/01/26 08:28:45 jkjome Exp $
 */

package org.enhydra.wireless.wml;

import java.util.HashSet;
import java.util.StringTokenizer;

import org.enhydra.apache.xerces.dom.DocumentTypeImpl;
import org.enhydra.wireless.wml.dom.WMLDocument;
import org.enhydra.wireless.wml.dom.xerces.WMLDOMImplementationImpl;
import org.enhydra.xml.xmlc.XMLCError;
import org.enhydra.xml.xmlc.dom.XMLCDomFactory;
import org.enhydra.xml.xmlc.dom.xerces.XercesDomFactory;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * XMLC DOM factory for creating WML-specified DocumentType and Document
 * objects.  Specifying this class as the XMLCDomFctory to xmlc
 * will produce XMLC document class that are WMLDocument classes.
 * This is specified using:
 *
 *  * xmlc -dom-factory org.enhydra.wireless.wml.WMLDomFactory
 * 
 */
public class WMLDomFactory extends XercesDomFactory {
    /**
     * WML URL attributes.
     */
    private static String[] URL_ATTRIBUTES = {
        "onenterforward", "onenterbackward",
        "ontimer", "href",
        "onpick", "src"
    };

    /**
     * HashSet built from URL_ATTRIBUTES.
     */
    private static final HashSet urlAttributes;


    private static final String IMPL_CLASS_SUFFIX = "Impl";
    private static final String WML_IMPLEMENTATION_DOT = "org.enhydra.wireless.wml.dom.xerces";
    private static final String WML_INTERFACE_DOT = "org.enhydra.wireless.wml.dom";

    /**
     * Class initializer.
     */
    static {
        urlAttributes = new HashSet(URL_ATTRIBUTES.length);
        for (int idx = 0; idx < URL_ATTRIBUTES.length; idx++) {
            urlAttributes.add(URL_ATTRIBUTES[idx]);
        }
    }
        
    /**
     * @see XMLCDomFactory#createDocumentType
     */
    public DocumentType createDocumentType(String qualifiedName,
                                           String publicId, 
                                           String systemId,
                                           String internalSubset) {
        DOMImplementation domImpl = WMLDOMImplementationImpl.getDOMImplementation();
        DocumentTypeImpl docType = (DocumentTypeImpl)domImpl.createDocumentType(qualifiedName, publicId, systemId);
        docType.setInternalSubset(internalSubset);
        return docType;
    }

    /**
     * @see XMLCDomFactory#createDocument
     */
    public Document createDocument(String namespaceURI,
                                   String qualifiedName,
                                   DocumentType docType) {
	DOMImplementation domImpl = WMLDOMImplementationImpl.getDOMImplementation();
        Document doc = domImpl.createDocument(namespaceURI, qualifiedName,
                                               docType);
        return doc;
    }

    /**
     * @see XMLCDomFactory#getMIMEType
     */
    public String getMIMEType() {
        return "text/vnd.wap.wml";
    }

    /**
     * @see XMLCDomFactory#getInterfaceNames
     */
    public String[] getInterfaceNames() {
        return new String[] {WMLDocument.class.getName()};
    }

    /**
     * @see XMLCDomFactory#nodeClassToInterface
     */
    public String nodeClassToInterface(Node node) {
	String ret = null;

        String className = node.getClass().getName();
	if (className.startsWith(WML_IMPLEMENTATION_DOT)) {
	    int suffixIdx = className.lastIndexOf(IMPL_CLASS_SUFFIX);
	    if (suffixIdx < 0) {
		throw new XMLCError("Class \"" + className
				    + "\" does not have suffix \"" + IMPL_CLASS_SUFFIX
				    + "\" (maybe be mismatch between XMLC code DOM implementation)");
	    }
	    ret = WML_INTERFACE_DOT + 
		className.substring(WML_IMPLEMENTATION_DOT.length(), suffixIdx);
	} else 
	    ret = super.nodeClassToInterface(node);
	return ret;
    }

    /**
     * @see XMLCDomFactory#getElementClassNames
     */
    public String[] getElementClassNames(Element elem) {
	String classNames = elem.getAttribute("class");
        if ((classNames == null) || (classNames.length() ==0)) {
            return null;
        }

        // Parse the class name.
        StringTokenizer tokens = new StringTokenizer(classNames);
        String[] names = new String[tokens.countTokens()];
        for (int idx = 0; idx < names.length; idx++) {
            names[idx] = tokens.nextToken();
        }
        return names;
    }

    /**
     * @see XMLCDomFactory#isURLAttribute
     */
    public boolean isURLAttribute(Element element,
                                  String attrName) {
        return urlAttributes.contains(attrName);
    }
}