content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 2001-2005 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: AbsoluteLocationPath.java,v 1.2.4.1 2005/09/12 09:44:03 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler;
  
  import jaxp.sun.org.apache.bcel.internal.generic.ALOAD;
  import jaxp.sun.org.apache.bcel.internal.generic.ASTORE;
  import jaxp.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionList;
  import jaxp.sun.org.apache.bcel.internal.generic.LocalVariableGen;
  import jaxp.sun.org.apache.bcel.internal.generic.NEW;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeType;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   */
  final class AbsoluteLocationPath extends Expression {
      private Expression _path;   // may be null
  
      public AbsoluteLocationPath() {
          _path = null;
      }
  
      public AbsoluteLocationPath(Expression path) {
          _path = path;
          if (path != null) {
              _path.setParent(this);
          }
      }
  
      public void setParser(Parser parser) {
          super.setParser(parser);
          if (_path != null) {
              _path.setParser(parser);
          }
      }
  
      public Expression getPath() {
          return(_path);
      }
  
      public String toString() {
          return "AbsoluteLocationPath(" +
              (_path != null ? _path.toString() : "null") + ')';
      }
  
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
          if (_path != null) {
              final Type ptype = _path.typeCheck(stable);
              if (ptype instanceof NodeType) {            // promote to node-set
                  _path = new CastExpr(_path, Type.NodeSet);
              }
          }
          return _type = Type.NodeSet;
      }
  
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
          final ConstantPoolGen cpg = classGen.getConstantPool();
          final InstructionList il = methodGen.getInstructionList();
          if (_path != null) {
              final int initAI = cpg.addMethodref(ABSOLUTE_ITERATOR,
                                                  "<init>",
                                                  "("
                                                  + NODE_ITERATOR_SIG
                                                  + ")V");
  
              // Compile relative path iterator(s)
              //
              // Backwards branches are prohibited if an uninitialized object is
              // on the stack by section 4.9.4 of the JVM Specification, 2nd Ed.
              // We don't know whether this code might contain backwards branches,
              // so we mustn't create the new object until after we've created
              // this argument to its constructor.  Instead we calculate the
              // value of the argument to the constructor first, store it in
              // a temporary variable, create the object and reload the argument
              // from the temporary to avoid the problem.
              _path.translate(classGen, methodGen);
              LocalVariableGen relPathIterator
                      = methodGen.addLocalVariable("abs_location_path_tmp",
                                         Util.getJCRefType(NODE_ITERATOR_SIG),
                                         null, null);
              relPathIterator.setStart(
                      il.append(new ASTORE(relPathIterator.getIndex())));
  
              // Create new AbsoluteIterator
              il.append(new NEW(cpg.addClass(ABSOLUTE_ITERATOR)));
              il.append(DUP);
              relPathIterator.setEnd(
                      il.append(new ALOAD(relPathIterator.getIndex())));
  
              // Initialize AbsoluteIterator with iterator from the stack
              il.append(new INVOKESPECIAL(initAI));
          }
          else {
              final int gitr = cpg.addInterfaceMethodref(DOM_INTF,
                                                         "getIterator",
                                                         "()"+NODE_ITERATOR_SIG);
              il.append(methodGen.loadDOM());
              il.append(new INVOKEINTERFACE(gitr, 1));
          }
      }
  }
  