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.util;
23
24 import com.sun.org.apache.bcel.internal.generic.ALOAD;
25 import com.sun.org.apache.bcel.internal.generic.ASTORE;
26 import com.sun.org.apache.bcel.internal.generic.BranchHandle;
27 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
28 import com.sun.org.apache.bcel.internal.generic.GOTO;
29 import com.sun.org.apache.bcel.internal.generic.IFNULL;
30 import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
31 import com.sun.org.apache.bcel.internal.generic.Instruction;
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.Constants;
35 import com.sun.org.apache.xalan.internal.utils.ObjectFactory;
36
37 /**
38 * @author Todd Miller
39 * @author Santiago Pericas-Geertsen
40 */
41 public final class ObjectType extends Type {
42
43 private String _javaClassName = "java.lang.Object";
44 private Class _clazz = java.lang.Object.class;
45
46 /**
47 * Used to represent a Java Class type such is required to support
48 * non-static java functions.
49 * @param javaClassName name of the class such as 'com.foo.Processor'
50 */
51 protected ObjectType(String javaClassName) {
52 _javaClassName = javaClassName;
53
54 try {
55 _clazz = ObjectFactory.findProviderClass(javaClassName, true);
56 }
57 catch (ClassNotFoundException e) {
58 _clazz = null;
59 }
60 }
61
62 protected ObjectType(Class clazz) {
63 _clazz = clazz;
64 _javaClassName = clazz.getName();
65 }
66
67 /**
68 * Must return the same value for all ObjectType instances. This is
69 * needed in CastExpr to ensure the mapping table is used correctly.
70 */
71 public int hashCode() {
72 return java.lang.Object.class.hashCode();
73 }
74
75 public boolean equals(Object obj) {
76 return (obj instanceof ObjectType);
77 }
78
79 public String getJavaClassName() {
80 return _javaClassName;
81 }
82
83 public Class getJavaClass() {
84 return _clazz;
85 }
86
87 public String toString() {
88 return _javaClassName;
89 }
90
91 public boolean identicalTo(Type other) {
92 return this == other;
93 }
94
95 public String toSignature() {
96 final StringBuffer result = new StringBuffer("L");
97 result.append(_javaClassName.replace('.', '/')).append(';');
98 return result.toString();
99 }
100
101 public com.sun.org.apache.bcel.internal.generic.Type toJCType() {
102 return Util.getJCRefType(toSignature());
103 }
104
105 /**
106 * Translates a void into an object of internal type <code>type</code>.
107 * This translation is needed when calling external functions
108 * that return void.
109 *
110 * @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
111 */
112 public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
113 Type type) {
114 if (type == Type.String) {
115 translateTo(classGen, methodGen, (StringType) type);
116 }
117 else {
118 ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
119 toString(), type.toString());
120 classGen.getParser().reportError(Constants.FATAL, err);
121 }
122 }
123
124 /**
125 * Expects an integer on the stack and pushes its string value by calling
126 * <code>Integer.toString(int i)</code>.
127 *
128 * @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
129 */
130 public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
131 StringType type) {
132 final ConstantPoolGen cpg = classGen.getConstantPool();
133 final InstructionList il = methodGen.getInstructionList();
134
135 il.append(DUP);
136 final BranchHandle ifNull = il.append(new IFNULL(null));
137 il.append(new INVOKEVIRTUAL(cpg.addMethodref(_javaClassName,
138 "toString",
139 "()" + STRING_SIG)));
140 final BranchHandle gotobh = il.append(new GOTO(null));
141 ifNull.setTarget(il.append(POP));
142 il.append(new PUSH(cpg, ""));
143 gotobh.setTarget(il.append(NOP));
144 }
145
146 /**
147 * Translates an object of this type to the external (Java) type denoted
148 * by <code>clazz</code>. This method is used to translate parameters
149 * when external functions are called.
150 */
151 public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
152 Class clazz) {
153 if (clazz.isAssignableFrom(_clazz))
154 methodGen.getInstructionList().append(NOP);
155 else {
156 ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
157 toString(), clazz.getClass().toString());
158 classGen.getParser().reportError(Constants.FATAL, err);
159 }
160 }
161
162 /**
163 * Translates an external Java type into an Object type
164 */
165 public void translateFrom(ClassGenerator classGen,
166 MethodGenerator methodGen, Class clazz) {
167 methodGen.getInstructionList().append(NOP);
168 }
169
170 public Instruction LOAD(int slot) {
171 return new ALOAD(slot);
172 }
173
174 public Instruction STORE(int slot) {
175 return new ASTORE(slot);
176 }
177 }