1 /*
   2  * reserved comment block
   3  * DO NOT REMOVE OR ALTER!
   4  */
   5 /*
   6  * Licensed to the Apache Software Foundation (ASF) under one or more
   7  * contributor license agreements.  See the NOTICE file distributed with
   8  * this work for additional information regarding copyright ownership.
   9  * The ASF licenses this file to You under the Apache License, Version 2.0
  10  * (the "License"); you may not use this file except in compliance with
  11  * the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.xalan.internal.xsltc.compiler;
  23 
  24 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  25 import com.sun.org.apache.bcel.internal.generic.ILOAD;
  26 import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
  27 import com.sun.org.apache.bcel.internal.generic.InstructionList;
  28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
  29 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.CompareGenerator;
  30 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
  31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TestGenerator;
  32 
  33 /**
  34  * @author Jacek Ambroziak
  35  * @author Santiago Pericas-Geertsen
  36  * @author Morten Jorgensen
  37  */
  38 final class PositionCall extends FunctionCall {
  39 
  40     public PositionCall(QName fname) {
  41         super(fname);
  42     }
  43 
  44     public boolean hasPositionCall() {
  45         return true;
  46     }
  47 
  48     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
  49         final InstructionList il = methodGen.getInstructionList();
  50 
  51         if (methodGen instanceof CompareGenerator) {
  52             il.append(((CompareGenerator)methodGen).loadCurrentNode());
  53         }
  54         else if (methodGen instanceof TestGenerator) {
  55             il.append(new ILOAD(POSITION_INDEX));
  56         }
  57         else {
  58             final ConstantPoolGen cpg = classGen.getConstantPool();
  59             final int index = cpg.addInterfaceMethodref(NODE_ITERATOR,
  60                                                        "getPosition",
  61                                                        "()I");
  62 
  63             il.append(methodGen.loadIterator());
  64             il.append(new INVOKEINTERFACE(index,1));
  65         }
  66     }
  67 }