code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you 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.
   */
  /*
   * $Id$
   */
  
  package org.apache.xalan.xsltc.compiler;
  
  import java.util.Vector;
  
  import org.apache.bcel.generic.InstructionList;
  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.apache.xalan.xsltc.compiler.util.Util;
  
  class TopLevelElement extends SyntaxTreeNode {
  
      /*
       * List of dependencies with other variables, parameters or
       * keys defined at the top level.
       */
      protected Vector _dependencies = null;
  
      /**
       * Type check all the children of this node.
       */
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
  	return typeCheckContents(stable);
      }
  
      /**
       * Translate this node into JVM bytecodes.
       */
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
  	ErrorMsg msg = new ErrorMsg(ErrorMsg.NOT_IMPLEMENTED_ERR,
  				    getClass(), this);
  	getParser().reportError(FATAL, msg);
      }
  	
      /**
       * Translate this node into a fresh instruction list.
       * The original instruction list is saved and restored.
       */
      public InstructionList compile(ClassGenerator classGen,
  				   MethodGenerator methodGen) {
  	final InstructionList result, save = methodGen.getInstructionList();
  	methodGen.setInstructionList(result = new InstructionList());
  	translate(classGen, methodGen);
  	methodGen.setInstructionList(save);
  	return result;
      }
  
      public void display(int indent) {
  	indent(indent);
  	Util.println("TopLevelElement");
  	displayContents(indent + IndentIncrement);
      }
      
      /**
       * Add a dependency with other top-level elements like
       * variables, parameters or keys.
       */
      public void addDependency(TopLevelElement other) {
  	if (_dependencies == null) {
  	    _dependencies = new Vector();
  	}
  	if (!_dependencies.contains(other)) {
  	    _dependencies.addElement(other);
  	}
      }
  
      /**
       * Get the list of dependencies with other top-level elements
       * like variables, parameteres or keys.
       */
      public Vector getDependencies() {
  	return _dependencies;
      }
  
  }
  