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/*
 * @(#)XslBuilder.java	1.7 99/02/05
 * 
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 * 
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 */


package com.sun.xml.xsl;

import java.io.IOException;
import java.util.Hashtable;

import org.w3c.dom.*;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import com.sun.xml.tree.*;
import com.sun.xml.parser.*;


/**
 * This builder is customized to build XSL stylesheets.
 *
 * @see StyleSheet
 */
public class XslBuilder extends XmlDocumentBuilder
{
    private XslBuilder ()
    {
    	setParser (new Parser ());
    }
    

    public XmlDocument createDocument ()
    {
	return new StyleSheet ();
    }

    /**
     * Returns an XSL style sheet parsed from the specified URI,
     * which may later be applied to a separate document.
     */
    public static StyleSheet createStyleSheet (String documentUri)
    throws IOException, SAXException
    {
    	XslBuilder	builder = new XslBuilder ();
    	InputSource	input = new InputSource (documentUri);
    	
    	try {
    	} catch (Exception e) {
    	    throw new SAXException (e);
    	}
    	
    	builder.setDisableNamespaces (false);
    	builder.setIgnoringLexicalInfo (true);
    	// XXX XSL "text" should ignore whitespace
    	
    	builder.getParser ().parse (input);
    	return builder.getStyleSheet ();
    }
    
    /** 
     * Returns the XML Stylesheet which was produced as a result
     * of parsing the document.  All imports and inclusions have
     * been done, so that the no child of the root element is more
     * important than its next sibling.
     *
     * Note: No protection yet from self-recursiveness;
     * that'll just loop forever.
     */
    private StyleSheet getStyleSheet ()
    throws IOException, SAXException
    {
    	StyleSheet	doc = (StyleSheet) getDocument ();
    	SheetRoot	root = (SheetRoot) doc.getDocumentElement ();
    	ElementNode	temp = null;
    	
    	root.normalize ();
    	
    	// first do the inclusions ... conceptually, they're imports
    	// that put nested imports at the end of the current list,
    	// not the beginning.
    	for (ElementNode node = (ElementNode) root.getFirstChild ();
		node != null;
		) {
    	    if (!"include".equals (node.getLocalName ())) {
    	    	if ("import".equals (node.getLocalName ()))
    	    	    temp = node;
    		node = (ElementNode) node.getNextSibling ();
    	        continue;
    	    }
    	    String	uri = node.getAttribute (StyleSheet.uri, "href");
    	        	
    	    temp = (ElementNode) spliceSheet (node, uri, temp);
    	    ElementNode next = (ElementNode) node.getNextSibling ();
    	    root.removeChild (node);
    	    node = next;
    	}
    	
    	// then do the imports ... they're done in groups, with any
    	// nested imports from one group done as part of the next one
    	// ("less important").
        while ((temp = (ElementNode) root.getFirstChild ()) != null
        	&& "import".equals (temp.getLocalName ())) {
            for (ElementNode node = temp; 
    		    node != null && "import".equals (node.getLocalName ());
    		    ) {
		String	uri = node.getAttribute (StyleSheet.uri, "href");
    	    
    	        spliceSheet (node, uri, null);
    	        ElementNode next = (ElementNode) node.getNextSibling ();
    	        root.removeChild (node);
    	        node = next;
    	    }
    	}
    	return doc;
    }
    
    private Node spliceSheet (Node before, String uri, Node lastImport)
    throws IOException, SAXException
    {
	InputSource	input = new InputSource (uri);
	SheetRoot	parent = (SheetRoot) before.getParentNode ();
	StyleSheet	inclusion, sheet;
	SheetRoot	root;
	    
	getParser ().parse (input);
	inclusion = getStyleSheet ();
	sheet = (StyleSheet) parent.getOwnerDocument ();
	    
	// Now replace "node" with  the nodes from the inclusion,
	// leaving imports for later
	root = (SheetRoot) inclusion.getDocumentElement ();
	for (int i = 0; ; i++) {
	    ElementNode	node = (ElementNode) root.item (i);
	    	
	    if (node == null)
	    	break;
	    if ("import".equals (node.getLocalName ()))
	        continue;
	            
	    // move node from imported sheet to this one
	    sheet.changeNodeOwner (node);
	    parent.insertBefore (node, before);
    
	    // make sure we process the next one.
	    i--;
	}
	    
	// Splice the import elements, then -- act on them later.
	Node	lastBefore;

	if (lastImport != null)
	    lastBefore = lastImport.getNextSibling ();
	else
	    lastBefore = parent.getFirstChild ();

	for (int i = 0; ; i++) {
	    Node	node = root.item (i);
	    	
	    if (node == null)
	    	break;
	            
	    // move import element before first non-import element
	    sheet.changeNodeOwner (node);
	    parent.insertBefore (node, lastBefore);

	    lastImport = node;
	    i--;
	}
	return lastImport;
    }
}