Source Code Cross Referenced for SignatureReader.java in  » Net » Terracotta » com » tc » asm » signature » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » Terracotta » com.tc.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 com.tc.asm.signature;
030:
031:        /**
032:         * A type signature parser to make a signature visitor visit an existing
033:         * signature.
034:         * 
035:         * @author Thomas Hallgren
036:         * @author Eric Bruneton
037:         */
038:        public class SignatureReader {
039:
040:            /**
041:             * The signature to be read.
042:             */
043:            private final String signature;
044:
045:            /**
046:             * Constructs a {@link SignatureReader} for the given signature.
047:             * 
048:             * @param signature A <i>ClassSignature</i>, <i>MethodTypeSignature</i>,
049:             *        or <i>FieldTypeSignature</i>.
050:             */
051:            public SignatureReader(final String signature) {
052:                this .signature = signature;
053:            }
054:
055:            /**
056:             * Makes the given visitor visit the signature of this
057:             * {@link SignatureReader}. This signature is the one specified in the
058:             * constructor (see {@link #SignatureReader(String) SignatureReader}). This
059:             * method is intended to be called on a {@link SignatureReader} that was
060:             * created using a <i>ClassSignature</i> (such as the
061:             * <code>signature</code> parameter of the
062:             * {@link com.tc.asm.ClassVisitor#visit ClassVisitor.visit} method)
063:             * or a <i>MethodTypeSignature</i> (such as the <code>signature</code>
064:             * parameter of the
065:             * {@link com.tc.asm.ClassVisitor#visitMethod ClassVisitor.visitMethod}
066:             * method).
067:             * 
068:             * @param v the visitor that must visit this signature.
069:             */
070:            public void accept(final SignatureVisitor v) {
071:                String signature = this .signature;
072:                int len = signature.length();
073:                int pos;
074:                char c;
075:
076:                if (signature.charAt(0) == '<') {
077:                    pos = 2;
078:                    do {
079:                        int end = signature.indexOf(':', pos);
080:                        v.visitFormalTypeParameter(signature.substring(pos - 1,
081:                                end));
082:                        pos = end + 1;
083:
084:                        c = signature.charAt(pos);
085:                        if (c == 'L' || c == '[' || c == 'T') {
086:                            pos = parseType(signature, pos, v.visitClassBound());
087:                        }
088:
089:                        for (;;) {
090:                            if ((c = signature.charAt(pos++)) == ':') {
091:                                pos = parseType(signature, pos, v
092:                                        .visitInterfaceBound());
093:                            } else {
094:                                break;
095:                            }
096:                        }
097:                    } while (c != '>');
098:                } else {
099:                    pos = 0;
100:                }
101:
102:                if (signature.charAt(pos) == '(') {
103:                    pos = pos + 1;
104:                    while (signature.charAt(pos) != ')') {
105:                        pos = parseType(signature, pos, v.visitParameterType());
106:                    }
107:                    pos = parseType(signature, pos + 1, v.visitReturnType());
108:                    while (pos < len) {
109:                        pos = parseType(signature, pos + 1, v
110:                                .visitExceptionType());
111:                    }
112:                } else {
113:                    pos = parseType(signature, pos, v.visitSuperclass());
114:                    while (pos < len) {
115:                        pos = parseType(signature, pos, v.visitInterface());
116:                    }
117:                }
118:            }
119:
120:            /**
121:             * Makes the given visitor visit the signature of this
122:             * {@link SignatureReader}. This signature is the one specified in the
123:             * constructor (see {@link #SignatureReader(String) SignatureReader}). This
124:             * method is intended to be called on a {@link SignatureReader} that was
125:             * created using a <i>FieldTypeSignature</i>, such as the
126:             * <code>signature</code> parameter of the
127:             * {@link com.tc.asm.ClassVisitor#visitField 
128:             * ClassVisitor.visitField} or {@link 
129:             * com.tc.asm.MethodVisitor#visitLocalVariable
130:             * MethodVisitor.visitLocalVariable} methods.
131:             * 
132:             * @param v the visitor that must visit this signature.
133:             */
134:            public void acceptType(final SignatureVisitor v) {
135:                parseType(this .signature, 0, v);
136:            }
137:
138:            /**
139:             * Parses a field type signature and makes the given visitor visit it.
140:             * 
141:             * @param signature a string containing the signature that must be parsed.
142:             * @param pos index of the first character of the signature to parsed.
143:             * @param v the visitor that must visit this signature.
144:             * @return the index of the first character after the parsed signature.
145:             */
146:            private static int parseType(final String signature, int pos,
147:                    final SignatureVisitor v) {
148:                char c;
149:                int start, end;
150:                boolean visited, inner;
151:                String name;
152:
153:                switch (c = signature.charAt(pos++)) {
154:                case 'Z':
155:                case 'C':
156:                case 'B':
157:                case 'S':
158:                case 'I':
159:                case 'F':
160:                case 'J':
161:                case 'D':
162:                case 'V':
163:                    v.visitBaseType(c);
164:                    return pos;
165:
166:                case '[':
167:                    return parseType(signature, pos, v.visitArrayType());
168:
169:                case 'T':
170:                    end = signature.indexOf(';', pos);
171:                    v.visitTypeVariable(signature.substring(pos, end));
172:                    return end + 1;
173:
174:                default: // case 'L':
175:                    start = pos;
176:                    visited = false;
177:                    inner = false;
178:                    for (;;) {
179:                        switch (c = signature.charAt(pos++)) {
180:                        case '.':
181:                        case ';':
182:                            if (!visited) {
183:                                name = signature.substring(start, pos - 1);
184:                                if (inner) {
185:                                    v.visitInnerClassType(name);
186:                                } else {
187:                                    v.visitClassType(name);
188:                                }
189:                            }
190:                            if (c == ';') {
191:                                v.visitEnd();
192:                                return pos;
193:                            }
194:                            start = pos;
195:                            visited = false;
196:                            inner = true;
197:                            break;
198:
199:                        case '<':
200:                            name = signature.substring(start, pos - 1);
201:                            if (inner) {
202:                                v.visitInnerClassType(name);
203:                            } else {
204:                                v.visitClassType(name);
205:                            }
206:                            visited = true;
207:                            top: for (;;) {
208:                                switch (c = signature.charAt(pos)) {
209:                                case '>':
210:                                    break top;
211:                                case '*':
212:                                    ++pos;
213:                                    v.visitTypeArgument();
214:                                    break;
215:                                case '+':
216:                                case '-':
217:                                    pos = parseType(signature, pos + 1, v
218:                                            .visitTypeArgument(c));
219:                                    break;
220:                                default:
221:                                    pos = parseType(signature, pos, v
222:                                            .visitTypeArgument('='));
223:                                    break;
224:                                }
225:                            }
226:                        }
227:                    }
228:                }
229:            }
230:        }
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