Include.java :  » XML » xalan » org » apache » xalan » xsltc » compiler » Java Open Source

/*
 * 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: Include.java,v 1.28 2004/02/16 22:24:29 minchau Exp $
 */

package org.apache.xalan.xsltc.compiler;

import java.io.File;
import java.io.FileNotFoundException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Enumeration;

import org.apache.xml.utils.SystemIDResolver;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.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 Include extends TopLevelElement {

    private Stylesheet _included = null;

    public Stylesheet getIncludedStylesheet() {
  return _included;
    }

    public void parseContents(final Parser parser) {
  XSLTC xsltc = parser.getXSLTC();
  Stylesheet context = parser.getCurrentStylesheet();
        
  String docToLoad = getAttribute("href");
  try {
      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();
                }
      }

            // 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;
      _included = parser.makeStylesheet(root);
      if (_included == null) return;

      _included.setSourceLoader(loader);
      _included.setSystemId(docToLoad);
      _included.setParentStylesheet(context);
      _included.setIncludingStylesheet(context);
      _included.setTemplateInlining(context.getTemplateInlining());

      // An included stylesheet gets the same import precedence
      // as the stylesheet that included it.
      final int precedence = context.getImportPrecedence();
      _included.setImportPrecedence(precedence);
      parser.setCurrentStylesheet(_included);
      _included.parseContents(parser);

      final Enumeration elements = _included.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
    }
}