Source Code Cross Referenced for DescriptorUtil.java in  » Aspect-oriented » aspectwerkz-2.0 » org » codehaus » aspectwerkz » definition » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Aspect oriented » aspectwerkz 2.0 » org.codehaus.aspectwerkz.definition 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.codehaus.aspectwerkz.definition;
002:
003:        import java.util.HashMap;
004:        import java.util.Map;
005:        import java.util.StringTokenizer;
006:
007:        /**
008:         * The signature of a method that is available from the BCEL library uses descriptors as defined in Section 4.3 of the
009:         * Java Virtual Machine specificaiton. Javadoc and Java do not use signatures in this same format. This class converts
010:         * the Javadoc/Java signature format to that used by the JVM spec. To summarize the descriptors <code> A method
011:         * descriptor represents the parameters that the method takes and the value that it returns:
012:         * <p/>
013:         * MethodDescriptor: ( ParameterDescriptor* ) ReturnDescriptor
014:         * <p/>
015:         * A parameter descriptor represents a parameter passed to a method:
016:         * <p/>
017:         * ParameterDescriptor: FieldType
018:         * <p/>
019:         * A return descriptor represents the type of the value returned from a method. It is a series of characters generated
020:         * by the grammar:
021:         * <p/>
022:         * ReturnDescriptor: FieldType V
023:         * <p/>
024:         * The character V indicates that the method returns no value (its return type is void). </code>
025:         * <p/>
026:         * <code> A field descriptor represents the type of a class, instance, or local variable. It is a series of characters
027:         * generated by the grammar:
028:         * <p/>
029:         * FieldDescriptor: FieldType
030:         * <p/>
031:         * ComponentType: FieldType
032:         * <p/>
033:         * FieldType: BaseType ObjectType ArrayType
034:         * <p/>
035:         * BaseType: B C D F I J S Z
036:         * <p/>
037:         * ObjectType: L <classname> ;
038:         * <p/>
039:         * ArrayType: [ ComponentType
040:         * <p/>
041:         * The characters of BaseType, the L and ; of ObjectType, and the [ of ArrayType are all ASCII characters. The
042:         * <classname> represents a fully qualified class or interface name. For historical reasons it is encoded in internal
043:         * form (4.2).  The interpretation of the field types is as shown in Table 4.2.
044:         * <p/>
045:         * BaseType Character  Type       Interpretation ---------------------------------------------- B                   byte
046:         * signed byte C                   char       Unicode character D                   double     double-precision
047:         * floating-point value F                   float      single-precision floating-point value I                   int
048:         * integer J                   long       long integer L<classname>;       reference  an instance of class <classname> S
049:         * short      signed short Z                   boolean    true or false [ reference  one array dimension
050:         *
051:         * @author <a href="mailto:mpollack@speakeasy.org">Mark Pollack</a>
052:         */
053:        public class DescriptorUtil {
054:            private static Map _paramTypeMap = new HashMap();
055:
056:            private static Map _returnTypeMap = new HashMap();
057:
058:            static {
059:                _paramTypeMap.put("byte", "B");
060:                _paramTypeMap.put("char", "C");
061:                _paramTypeMap.put("double", "D");
062:                _paramTypeMap.put("float", "F");
063:                _paramTypeMap.put("int", "I");
064:                _paramTypeMap.put("long", "J");
065:
066:                //todo: make generic...look for 'dots' of package. that algorithm doesn't handle
067:                // packageless (default package)
068:                // classes though..
069:                _paramTypeMap.put("java.lang.Object", "Ljava/lang/Object;");
070:                _paramTypeMap.put("short", "S");
071:                _paramTypeMap.put("boolean", "Z");
072:
073:                //todo
074:                _paramTypeMap.put("array reference", "[");
075:                _returnTypeMap.put("void", "V");
076:            }
077:
078:            /**
079:             * Converts from the Java/Javadoc method signature the JVM spec format.
080:             *
081:             * @param javadocSig        method signature as returned via Javadoc API.
082:             * @param javadocReturnType return type as returned via Javadoc API.
083:             * @return mtehod signature as defined in the JVM spec.
084:             */
085:            public static String convert(String javadocSig,
086:                    String javadocReturnType) {
087:                //remove the leading and trailing parens
088:                String javadocSigTrim = javadocSig.substring(1, javadocSig
089:                        .length() - 1);
090:                StringTokenizer st = new StringTokenizer(javadocSigTrim, ",");
091:                StringBuffer jvmBuff = new StringBuffer("(");
092:                while (st.hasMoreTokens()) {
093:                    //remove the leading space character.
094:                    String sigElement = st.nextToken().trim();
095:                    if (_paramTypeMap.containsKey(sigElement)) {
096:                        jvmBuff.append(_paramTypeMap.get(sigElement));
097:                    }
098:                }
099:                jvmBuff.append(")");
100:                if (_returnTypeMap.containsKey(javadocReturnType)) {
101:                    jvmBuff.append(_returnTypeMap.get(javadocReturnType));
102:                }
103:                return jvmBuff.toString();
104:            }
105:
106:            /**
107:             * Convert a JVM signature as defined in the JVM spec to that used in the Java.
108:             *
109:             * @param jvmSignature The JVM format signature.
110:             * @return a <code>String[]</code> containing the method parameter as elements of the array.
111:             */
112:            public static String[] getParameters(final String jvmSignature) {
113:                int i = 0;
114:                if (jvmSignature.charAt(i) != '(') {
115:                    return null;
116:                }
117:                int j = 0;
118:                StringBuffer stringbuffer = new StringBuffer();
119:                for (i++; i < jvmSignature.length();) {
120:                    if (jvmSignature.charAt(i) == ')') {
121:                        i++;
122:                        break; //we are at the end of the signature.
123:                    }
124:                    if (i > 1) {
125:                        //put in spaces to later tokenize on.
126:                        stringbuffer.append(" ");
127:                    }
128:                    i = jvmFormatToJavaFormat(jvmSignature, i, stringbuffer);
129:
130:                    //count number of elements parsed.
131:                    j++;
132:                }
133:
134:                //convert to string array.
135:                String convertedString = stringbuffer.toString();
136:                String[] as = new String[j];
137:                int k = 0;
138:                StringTokenizer st = new StringTokenizer(convertedString);
139:                while (st.hasMoreTokens()) {
140:                    as[k++] = st.nextToken();
141:                }
142:                return as;
143:            }
144:
145:            /**
146:             * The utility method that does the real work of parsing through the JVM formatted string and adding an converted
147:             * method parameter description to the StringBuffer.
148:             *
149:             * @param jvmFormat    The JVM formatted string that is being parsed.
150:             * @param i            The offset into the string being parsed.
151:             * @param stringbuffer The storage for building the converted method signature.
152:             * @return new offset location for parsing.
153:             * @TODO this an extremely ugly method (the int an stringbuffer params must be removed)
154:             */
155:            private static int jvmFormatToJavaFormat(final String jvmFormat,
156:                    int i, StringBuffer stringbuffer) {
157:                String s1 = "";
158:
159:                //arrays.
160:                for (; jvmFormat.charAt(i) == '['; i++) {
161:                    s1 = s1 + "[]";
162:                }
163:                startover: switch (jvmFormat.charAt(i)) {
164:                case 66: // 'B'
165:                    stringbuffer.append("byte");
166:                    break;
167:                case 67: // 'C'
168:                    stringbuffer.append("char");
169:                    break;
170:                case 68: // 'D'
171:                    stringbuffer.append("double");
172:                    break;
173:                case 70: // 'F'
174:                    stringbuffer.append("float");
175:                    break;
176:                case 73: // 'I'
177:                    stringbuffer.append("int");
178:                    break;
179:                case 74: // 'J'
180:                    stringbuffer.append("long");
181:                    break;
182:                case 83: // 'S'
183:                    stringbuffer.append("short");
184:                    break;
185:                case 90: // 'Z'
186:                    stringbuffer.append("boolean");
187:                    break;
188:                case 86: // 'V'
189:                    stringbuffer.append("void");
190:                    break;
191:                case 76: // 'L'
192:
193:                    //special case for objects.
194:                    for (i++; i < jvmFormat.length(); i++) {
195:                        if (jvmFormat.charAt(i) == '/') {
196:                            //convert to period
197:                            stringbuffer.append('.');
198:                        } else {
199:                            if (jvmFormat.charAt(i) == ';') {
200:                                //we reached the end
201:                                break startover;
202:                            }
203:
204:                            //copy contents.
205:                            stringbuffer.append(jvmFormat.charAt(i));
206:                        }
207:                    }
208:                    break;
209:                default:
210:                    return jvmFormat.length();
211:                }
212:                stringbuffer = stringbuffer.append(s1);
213:                return ++i;
214:            }
215:        }
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