Source Code Cross Referenced for SignatureWriter.java in  » Testing » Ejb3Unit » org » ejb3unit » asm » signature » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » Ejb3Unit » org.ejb3unit.asm.signature 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /***
002:         * ASM: a very small and fast Java bytecode manipulation framework
003:         * Copyright (c) 2000-2005 INRIA, France Telecom
004:         * All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         * 1. Redistributions of source code must retain the above copyright
010:         *    notice, this list of conditions and the following disclaimer.
011:         * 2. Redistributions in binary form must reproduce the above copyright
012:         *    notice, this list of conditions and the following disclaimer in the
013:         *    documentation and/or other materials provided with the distribution.
014:         * 3. Neither the name of the copyright holders nor the names of its
015:         *    contributors may be used to endorse or promote products derived from
016:         *    this software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
022:         * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
023:         * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
024:         * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
025:         * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
026:         * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
027:         * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
028:         * THE POSSIBILITY OF SUCH DAMAGE.
029:         */package org.ejb3unit.asm.signature;
030:
031:        /**
032:         * A signature visitor that generates signatures in string format.
033:         * 
034:         * @author Thomas Hallgren
035:         * @author Eric Bruneton
036:         */
037:        public class SignatureWriter implements  SignatureVisitor {
038:
039:            /**
040:             * Buffer used to construct the signature.
041:             */
042:            private final StringBuffer buf = new StringBuffer();
043:
044:            /**
045:             * Indicates if the signature contains formal type parameters.
046:             */
047:            private boolean hasFormals;
048:
049:            /**
050:             * Indicates if the signature contains method parameter types.
051:             */
052:            private boolean hasParameters;
053:
054:            /**
055:             * Stack used to keep track of class types that have arguments. Each element
056:             * of this stack is a boolean encoded in one bit. The top of the stack is
057:             * the lowest order bit. Pushing false = *2, pushing true = *2+1, popping =
058:             * /2.
059:             */
060:            private int argumentStack;
061:
062:            /**
063:             * Constructs a new {@link SignatureWriter} object.
064:             */
065:            public SignatureWriter() {
066:            }
067:
068:            // ------------------------------------------------------------------------
069:            // Implementation of the SignatureVisitor interface
070:            // ------------------------------------------------------------------------
071:
072:            public void visitFormalTypeParameter(final String name) {
073:                if (!hasFormals) {
074:                    hasFormals = true;
075:                    buf.append('<');
076:                }
077:                buf.append(name);
078:                buf.append(':');
079:            }
080:
081:            public SignatureVisitor visitClassBound() {
082:                return this ;
083:            }
084:
085:            public SignatureVisitor visitInterfaceBound() {
086:                buf.append(':');
087:                return this ;
088:            }
089:
090:            public SignatureVisitor visitSuperclass() {
091:                endFormals();
092:                return this ;
093:            }
094:
095:            public SignatureVisitor visitInterface() {
096:                return this ;
097:            }
098:
099:            public SignatureVisitor visitParameterType() {
100:                endFormals();
101:                if (!hasParameters) {
102:                    hasParameters = true;
103:                    buf.append('(');
104:                }
105:                return this ;
106:            }
107:
108:            public SignatureVisitor visitReturnType() {
109:                endFormals();
110:                if (!hasParameters) {
111:                    buf.append('(');
112:                }
113:                buf.append(')');
114:                return this ;
115:            }
116:
117:            public SignatureVisitor visitExceptionType() {
118:                buf.append('^');
119:                return this ;
120:            }
121:
122:            public void visitBaseType(final char descriptor) {
123:                buf.append(descriptor);
124:            }
125:
126:            public void visitTypeVariable(final String name) {
127:                buf.append('T');
128:                buf.append(name);
129:                buf.append(';');
130:            }
131:
132:            public SignatureVisitor visitArrayType() {
133:                buf.append('[');
134:                return this ;
135:            }
136:
137:            public void visitClassType(final String name) {
138:                buf.append('L');
139:                buf.append(name);
140:                argumentStack *= 2;
141:            }
142:
143:            public void visitInnerClassType(final String name) {
144:                endArguments();
145:                buf.append('.');
146:                buf.append(name);
147:                argumentStack *= 2;
148:            }
149:
150:            public void visitTypeArgument() {
151:                if (argumentStack % 2 == 0) {
152:                    ++argumentStack;
153:                    buf.append('<');
154:                }
155:                buf.append('*');
156:            }
157:
158:            public SignatureVisitor visitTypeArgument(final char wildcard) {
159:                if (argumentStack % 2 == 0) {
160:                    ++argumentStack;
161:                    buf.append('<');
162:                }
163:                if (wildcard != '=') {
164:                    buf.append(wildcard);
165:                }
166:                return this ;
167:            }
168:
169:            public void visitEnd() {
170:                endArguments();
171:                buf.append(';');
172:            }
173:
174:            /**
175:             * Returns the signature that was built by this signature writer.
176:             * 
177:             * @return the signature that was built by this signature writer.
178:             */
179:            public String toString() {
180:                return buf.toString();
181:            }
182:
183:            // ------------------------------------------------------------------------
184:            // Utility methods
185:            // ------------------------------------------------------------------------
186:
187:            /**
188:             * Ends the formal type parameters section of the signature.
189:             */
190:            private void endFormals() {
191:                if (hasFormals) {
192:                    hasFormals = false;
193:                    buf.append('>');
194:                }
195:            }
196:
197:            /**
198:             * Ends the type arguments of a class or inner class type.
199:             */
200:            private void endArguments() {
201:                if (argumentStack % 2 != 0) {
202:                    buf.append('>');
203:                }
204:                argumentStack /= 2;
205:            }
206:        }
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