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