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: DocumentCall.java,v 1.2.4.1 2005/09/01 14:10:13 pvedula Exp $
22 */
23
24 package com.sun.org.apache.xalan.internal.xsltc.compiler;
25
26 import java.util.Vector;
27
28 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
29 import com.sun.org.apache.bcel.internal.generic.GETFIELD;
30 import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
31 import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
32 import com.sun.org.apache.bcel.internal.generic.InstructionList;
33 import com.sun.org.apache.bcel.internal.generic.PUSH;
34 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
35 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
36 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
37 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
38 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
39
40 /**
41 * @author Jacek Ambroziak
42 * @author Morten Jorgensen
43 */
44 final class DocumentCall extends FunctionCall {
45
46 private Expression _arg1 = null;
47 private Expression _arg2 = null;
48 private Type _arg1Type;
49
50 /**
51 * Default function call constructor
52 */
53 public DocumentCall(QName fname, Vector arguments) {
54 super(fname, arguments);
55 }
56
57 /**
58 * Type checks the arguments passed to the document() function. The first
59 * argument can be any type (we must cast it to a string) and contains the
60 * URI of the document
61 */
62 public Type typeCheck(SymbolTable stable) throws TypeCheckError {
63 // At least one argument - two at most
64 final int ac = argumentCount();
65 if ((ac < 1) || (ac > 2)) {
66 ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, this);
67 throw new TypeCheckError(msg);
68 }
69 if (getStylesheet() == null) {
70 ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ARG_ERR, this);
71 throw new TypeCheckError(msg);
72 }
73
74 // Parse the first argument
75 _arg1 = argument(0);
76
77 if (_arg1 == null) {// should not happened
78 ErrorMsg msg = new ErrorMsg(ErrorMsg.DOCUMENT_ARG_ERR, this);
79 throw new TypeCheckError(msg);
80 }
81
82 _arg1Type = _arg1.typeCheck(stable);
83 if ((_arg1Type != Type.NodeSet) && (_arg1Type != Type.String)) {
84 _arg1 = new CastExpr(_arg1, Type.String);
85 }
86
87 // Parse the second argument
88 if (ac == 2) {
89 _arg2 = argument(1);
90
91 if (_arg2 == null) {// should not happened
92 ErrorMsg msg = new ErrorMsg(ErrorMsg.DOCUMENT_ARG_ERR, this);
93 throw new TypeCheckError(msg);
94 }
95
96 final Type arg2Type = _arg2.typeCheck(stable);
97
98 if (arg2Type.identicalTo(Type.Node)) {
99 _arg2 = new CastExpr(_arg2, Type.NodeSet);
100 } else if (arg2Type.identicalTo(Type.NodeSet)) {
101 // falls through
102 } else {
103 ErrorMsg msg = new ErrorMsg(ErrorMsg.DOCUMENT_ARG_ERR, this);
104 throw new TypeCheckError(msg);
105 }
106 }
107
108 return _type = Type.NodeSet;
109 }
110
111 /**
112 * Translates the document() function call to a call to LoadDocument()'s
113 * static method document().
114 */
115 public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
116 final ConstantPoolGen cpg = classGen.getConstantPool();
117 final InstructionList il = methodGen.getInstructionList();
118 final int ac = argumentCount();
119
120 final int domField = cpg.addFieldref(classGen.getClassName(),
121 DOM_FIELD,
122 DOM_INTF_SIG);
123
124 String docParamList = null;
125 if (ac == 1) {
126 // documentF(Object,String,AbstractTranslet,DOM)
127 docParamList = "("+OBJECT_SIG+STRING_SIG+TRANSLET_SIG+DOM_INTF_SIG
128 +")"+NODE_ITERATOR_SIG;
129 } else { //ac == 2; ac < 1 or as >2 was tested in typeChec()
130 // documentF(Object,DTMAxisIterator,String,AbstractTranslet,DOM)
131 docParamList = "("+OBJECT_SIG+NODE_ITERATOR_SIG+STRING_SIG
132 +TRANSLET_SIG+DOM_INTF_SIG+")"+NODE_ITERATOR_SIG;
133 }
134 final int docIdx = cpg.addMethodref(LOAD_DOCUMENT_CLASS, "documentF",
135 docParamList);
136
137
138 // The URI can be either a node-set or something else cast to a string
139 _arg1.translate(classGen, methodGen);
140 if (_arg1Type == Type.NodeSet) {
141 _arg1.startIterator(classGen, methodGen);
142 }
143
144 if (ac == 2) {
145 //_arg2 == null was tested in typeChec()
146 _arg2.translate(classGen, methodGen);
147 _arg2.startIterator(classGen, methodGen);
148 }
149
150 // Feck the rest of the parameters on the stack
151 il.append(new PUSH(cpg, getStylesheet().getSystemId()));
152 il.append(classGen.loadTranslet());
153 il.append(DUP);
154 il.append(new GETFIELD(domField));
155 il.append(new INVOKESTATIC(docIdx));
156 }
157
158 }