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1   /*
2    * reserved comment block
3    * DO NOT REMOVE OR ALTER!
4    */
5   /*
6    * Copyright 2001-2004 The Apache Software Foundation.
7    *
8    * Licensed under the Apache License, Version 2.0 (the "License");
9    * you may not use this file except in compliance with the License.
10   * You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  /*
21   * $Id: LastCall.java,v 1.2.4.1 2005/09/01 15:55:34 pvedula Exp $
22   */
23  
24  package com.sun.org.apache.xalan.internal.xsltc.compiler;
25  
26  import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
27  import com.sun.org.apache.bcel.internal.generic.ILOAD;
28  import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
29  import com.sun.org.apache.bcel.internal.generic.InstructionList;
30  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
31  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.CompareGenerator;
32  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
33  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TestGenerator;
34  
35  /**
36   * @author Jacek Ambroziak
37   * @author Santiago Pericas-Geertsen
38   */
39  final class LastCall extends FunctionCall {
40  
41      public LastCall(QName fname) {
42          super(fname);
43      }
44  
45      public boolean hasPositionCall() {
46          return true;
47      }
48  
49      public boolean hasLastCall() {
50          return true;
51      }
52  
53      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
54          final InstructionList il = methodGen.getInstructionList();
55  
56          if (methodGen instanceof CompareGenerator) {
57              il.append(((CompareGenerator)methodGen).loadLastNode());
58          }
59          else if (methodGen instanceof TestGenerator) {
60              il.append(new ILOAD(LAST_INDEX));
61          }
62          else {
63              final ConstantPoolGen cpg = classGen.getConstantPool();
64              final int getLast = cpg.addInterfaceMethodref(NODE_ITERATOR,
65                                                            "getLast",
66                                                            "()I");
67              il.append(methodGen.loadIterator());
68              il.append(new INVOKEINTERFACE(getLast, 1));
69          }
70      }
71  }