/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * Copyright 2001-2004 The Apache Software Foundation.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/*

 * $Id: Import.java,v 1.2.4.1 2005/09/12 10:32:33 pvedula Exp $

 */

package com.sun.org.apache.xalan.internal.xsltc.compiler;

import java.io.File;

import java.net.URL;

import java.net.MalformedURLException;

import java.util.Enumeration;

import com.sun.org.apache.xml.internal.utils.SystemIDResolver;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;

import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;

import org.xml.sax.InputSource;

import org.xml.sax.XMLReader;

/**

 * @author Jacek Ambroziak

 * @author Morten Jorgensen

 * @author Erwin Bolwidt <ejb@klomp.org>

 * @author Gunnlaugur Briem <gthb@dimon.is>

 */

final class Import extends TopLevelElement {

    private Stylesheet _imported = null;

    public Stylesheet getImportedStylesheet() {

        return _imported;

    }

    public void parseContents(final Parser parser) {

        final XSLTC xsltc = parser.getXSLTC();

        final Stylesheet context = parser.getCurrentStylesheet();

        try {

            String docToLoad = getAttribute("href");

            if (context.checkForLoop(docToLoad)) {

                final ErrorMsg msg = new ErrorMsg(ErrorMsg.CIRCULAR_INCLUDE_ERR,

                                                  docToLoad, this);

                parser.reportError(Constants.FATAL, msg);

                return;

            }

            InputSource input = null;

            XMLReader reader = null;

            String currLoadedDoc = context.getSystemId();

            SourceLoader loader = context.getSourceLoader();

            // Use SourceLoader if available

            if (loader != null) {

                input = loader.loadSource(docToLoad, currLoadedDoc, xsltc);

                if (input != null) {

                    docToLoad = input.getSystemId();

                    reader = xsltc.getXMLReader();

                } else if (parser.errorsFound()) {

                    return;

                }

            }

            // No SourceLoader or not resolved by SourceLoader

            if (input == null) {

                docToLoad = SystemIDResolver.getAbsoluteURI(docToLoad, currLoadedDoc);

                input = new InputSource(docToLoad);

            }

            // Return if we could not resolve the URL

            if (input == null) {

                final ErrorMsg msg =

                    new ErrorMsg(ErrorMsg.FILE_NOT_FOUND_ERR, docToLoad, this);

                parser.reportError(Constants.FATAL, msg);

                return;

            }

            final SyntaxTreeNode root;

            if (reader != null) {

                root = parser.parse(reader,input);

            }

            else {

                root = parser.parse(input);

            }

            if (root == null) return;

            _imported = parser.makeStylesheet(root);

            if (_imported == null) return;

            _imported.setSourceLoader(loader);

            _imported.setSystemId(docToLoad);

            _imported.setParentStylesheet(context);

            _imported.setImportingStylesheet(context);

        _imported.setTemplateInlining(context.getTemplateInlining());

            // 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 Object element = elements.nextElement();

                if (element instanceof TopLevelElement) {

                    if (element instanceof Variable) {

                        topStylesheet.addVariable((Variable) element);

                    }

                    else if (element instanceof Param) {

                        topStylesheet.addParam((Param) element);

                    }

                    else {

                        topStylesheet.addElement((TopLevelElement) element);

                    }

                }

            }

        }

        catch (Exception e) {

            e.printStackTrace();

        }

        finally {

            parser.setCurrentStylesheet(context);

        }

    }

    public Type typeCheck(SymbolTable stable) throws TypeCheckError {

        return Type.Void;

    }

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {

        // do nothing

    }

}