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 org.apache.bcel.generic.ConstantPoolGen;
  import org.apache.bcel.generic.ILOAD;
  import org.apache.bcel.generic.INVOKEINTERFACE;
  import org.apache.bcel.generic.InstructionList;
  import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
  import org.apache.xalan.xsltc.compiler.util.CompareGenerator;
  import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
  import org.apache.xalan.xsltc.compiler.util.TestGenerator;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   */
  final class LastCall extends FunctionCall {
  
      public LastCall(QName fname) {
  	super(fname);
      }
  
      public boolean hasPositionCall() {
  	return true;
      }
  
      public boolean hasLastCall() {
  	return true;
      }
  
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
  	final InstructionList il = methodGen.getInstructionList();
  
  	if (methodGen instanceof CompareGenerator) {
  	    il.append(((CompareGenerator)methodGen).loadLastNode());
  	}
  	else if (methodGen instanceof TestGenerator) {
  	    il.append(new ILOAD(LAST_INDEX));
  	}
  	else {
  	    final ConstantPoolGen cpg = classGen.getConstantPool();
  	    final int getLast = cpg.addInterfaceMethodref(NODE_ITERATOR,
  							  "getLast", 
  							  "()I");
  	    il.append(methodGen.loadIterator());
  	    il.append(new INVOKEINTERFACE(getLast, 1));
  	}
      }
  }
  