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
22package com.sun.org.apache.xalan.internal.xsltc.compiler;
23
24import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
25import com.sun.org.apache.bcel.internal.generic.ILOAD;
26import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
27import com.sun.org.apache.bcel.internal.generic.InstructionList;
28import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
29import com.sun.org.apache.xalan.internal.xsltc.compiler.util.CompareGenerator;
30import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
31import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TestGenerator;
32
33/**
34 * @author Jacek Ambroziak
35 * @author Santiago Pericas-Geertsen
36 */
37final class LastCall extends FunctionCall {
38
39    public LastCall(QName fname) {
40        super(fname);
41    }
42
43    public boolean hasPositionCall() {
44        return true;
45    }
46
47    public boolean hasLastCall() {
48        return true;
49    }
50
51    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
52        final InstructionList il = methodGen.getInstructionList();
53
54        if (methodGen instanceof CompareGenerator) {
55            il.append(((CompareGenerator)methodGen).loadLastNode());
56        }
57        else if (methodGen instanceof TestGenerator) {
58            il.append(new ILOAD(LAST_INDEX));
59        }
60        else {
61            final ConstantPoolGen cpg = classGen.getConstantPool();
62            final int getLast = cpg.addInterfaceMethodref(NODE_ITERATOR,
63                                                          "getLast",
64                                                          "()I");
65            il.append(methodGen.loadIterator());
66            il.append(new INVOKEINTERFACE(getLast, 1));
67        }
68    }
69}
70