/*
 * @(#)$Id$
 *
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, Sun
 * Microsystems., http://www.sun.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * @author Jacek Ambroziak
 * @author Morten Jorgensen
 *
 */

package org.apache.xalan.xsltc.compiler;

import java.net.URL;
import java.net.MalformedURLException;
import java.util.Enumeration;

import javax.xml.parsers.*;

import org.xml.sax.*;

import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.*;

import de.fub.bytecode.generic.*;

final class Import extends TopLevelElement {

    private Stylesheet _imported = null;

    public Stylesheet getImportedStylesheet() {
	return(_imported);
    }

    public void parseContents(final Parser parser) {
	try {
	    final Stylesheet context = parser.getCurrentStylesheet();
	    final String href = getAttribute("href");
	    final URL toImport = new URL(context.getURL(), href);
	    if (context.checkForLoop(toImport))
		throw new Exception(toImport.toString() + " already loaded");

	    final SyntaxTreeNode root = parser.parse(toImport);
	    if (root == null) return;
	    final Stylesheet _imported = parser.makeStylesheet(root);
	    if (_imported == null) return;

	    _imported.setURL(toImport);
	    _imported.setParentStylesheet(context);

	    // precedence for the including stylesheet
	    final int currPrecedence = parser.getCurrentImportPrecedence();
	    final int nextPrecedence = parser.getNextImportPrecedence();
	    _imported.setImportPrecedence(currPrecedence);
	    context.setImportPrecedence(nextPrecedence);
	    parser.setCurrentStylesheet(_imported);
	    _imported.parseContents(parser);

	    final Enumeration elements = _imported.elements();
	    final Stylesheet topStylesheet = parser.getTopLevelStylesheet();
	    while (elements.hasMoreElements()) {
		final TopLevelElement topLevelElement =
		    (TopLevelElement)elements.nextElement();
		topStylesheet.addElement(topLevelElement);
	    }
	    parser.setCurrentStylesheet(context);
	}
	catch (Exception e) {
	    e.printStackTrace();
	}
    }
    
    public Type typeCheck(SymbolTable stable) throws TypeCheckError {
	return Type.Void;
    }
    
    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
	// do nothing
    }
}