Source Code Cross Referenced for MethodDesc.java in  » Byte-Code » Cojen » org » cojen » classfile » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Byte Code » Cojen » org.cojen.classfile 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright 2004 Brian S O'Neill
003:         *
004:         *  Licensed under the Apache License, Version 2.0 (the "License");
005:         *  you may not use this file except in compliance with the License.
006:         *  You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         *  Unless required by applicable law or agreed to in writing, software
011:         *  distributed under the License is distributed on an "AS IS" BASIS,
012:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         *  See the License for the specific language governing permissions and
014:         *  limitations under the License.
015:         */
016:
017:        package org.cojen.classfile;
018:
019:        import java.io.Serializable;
020:        import java.io.Externalizable;
021:        import java.io.ObjectOutput;
022:        import java.io.ObjectInput;
023:        import java.io.IOException;
024:        import java.io.ObjectStreamException;
025:        import java.lang.reflect.Method;
026:        import java.util.List;
027:        import java.util.ArrayList;
028:        import org.cojen.util.WeakCanonicalSet;
029:
030:        /**
031:         * This class is used to build method descriptor strings as 
032:         * defined in <i>The Java Virtual Machine Specification</i>, section 4.3.3.
033:         * MethodDesc instances are canonicalized and therefore "==" comparable.
034:         *
035:         * @author Brian S O'Neill
036:         */
037:        public class MethodDesc extends Descriptor implements  Serializable {
038:            private static final TypeDesc[] EMPTY_PARAMS = new TypeDesc[0];
039:
040:            // MethodDesc and TypeDesc can share the same instance cache.
041:            private final static WeakCanonicalSet mInstances = TypeDesc.cInstances;
042:
043:            static MethodDesc intern(MethodDesc desc) {
044:                return (MethodDesc) mInstances.put(desc);
045:            }
046:
047:            /**
048:             * Acquire a MethodDesc from a set of arguments.
049:             * @param ret return type of method; null implies void
050:             * @param params parameters to method; null implies none
051:             */
052:            public static MethodDesc forArguments(TypeDesc ret,
053:                    TypeDesc[] params) {
054:                if (ret == null) {
055:                    ret = TypeDesc.VOID;
056:                }
057:                if (params == null || params.length == 0) {
058:                    params = EMPTY_PARAMS;
059:                }
060:                return intern(new MethodDesc(ret, params));
061:            }
062:
063:            /**
064:             * Acquire a MethodDesc from a type descriptor. This syntax is described in
065:             * section 4.3.3, Method Descriptors.
066:             */
067:            public static MethodDesc forDescriptor(String desc)
068:                    throws IllegalArgumentException {
069:                try {
070:                    int cursor = 0;
071:                    char c;
072:
073:                    if ((c = desc.charAt(cursor++)) != '(') {
074:                        throw invalidDescriptor(desc);
075:                    }
076:
077:                    StringBuffer buf = new StringBuffer();
078:                    List list = new ArrayList();
079:
080:                    while ((c = desc.charAt(cursor++)) != ')') {
081:                        switch (c) {
082:                        case 'V':
083:                        case 'I':
084:                        case 'C':
085:                        case 'Z':
086:                        case 'D':
087:                        case 'F':
088:                        case 'J':
089:                        case 'B':
090:                        case 'S':
091:                            buf.append(c);
092:                            break;
093:                        case '[':
094:                            buf.append(c);
095:                            continue;
096:                        case 'L':
097:                            while (true) {
098:                                buf.append(c);
099:                                if (c == ';') {
100:                                    break;
101:                                }
102:                                c = desc.charAt(cursor++);
103:                            }
104:                            break;
105:                        default:
106:                            throw invalidDescriptor(desc);
107:                        }
108:
109:                        list.add(TypeDesc.forDescriptor(buf.toString()));
110:                        buf.setLength(0);
111:                    }
112:
113:                    TypeDesc ret = TypeDesc.forDescriptor(desc
114:                            .substring(cursor));
115:
116:                    TypeDesc[] tds = new TypeDesc[list.size()];
117:                    tds = (TypeDesc[]) list.toArray(tds);
118:
119:                    return intern(new MethodDesc(desc, ret, tds));
120:                } catch (NullPointerException e) {
121:                    throw invalidDescriptor(desc);
122:                } catch (IndexOutOfBoundsException e) {
123:                    throw invalidDescriptor(desc);
124:                }
125:            }
126:
127:            public static MethodDesc forMethod(Method method) {
128:                Class[] paramClasses = method.getParameterTypes();
129:                TypeDesc[] paramTypes;
130:                if (paramClasses == null || paramClasses.length == 0) {
131:                    paramTypes = EMPTY_PARAMS;
132:                } else {
133:                    paramTypes = new TypeDesc[paramClasses.length];
134:                    for (int i = paramClasses.length; --i >= 0;) {
135:                        paramTypes[i] = TypeDesc.forClass(paramClasses[i]);
136:                    }
137:                }
138:                return forArguments(TypeDesc.forClass(method.getReturnType()),
139:                        paramTypes);
140:            }
141:
142:            private static IllegalArgumentException invalidDescriptor(
143:                    String desc) {
144:                return new IllegalArgumentException("Invalid descriptor: "
145:                        + desc);
146:            }
147:
148:            private transient final String mDescriptor;
149:            private transient final TypeDesc mRetType;
150:            private transient final TypeDesc[] mParams;
151:
152:            private MethodDesc(TypeDesc ret, TypeDesc[] params) {
153:                mDescriptor = generateDescriptor(ret, params);
154:                mRetType = ret;
155:                mParams = params;
156:            }
157:
158:            private MethodDesc(String desc, TypeDesc ret, TypeDesc[] params) {
159:                mDescriptor = desc;
160:                mRetType = ret;
161:                mParams = params;
162:            }
163:
164:            /**
165:             * Returns a method descriptor string, excluding generics.
166:             */
167:            public String getDescriptor() {
168:                return mDescriptor;
169:            }
170:
171:            /**
172:             * Returns a method descriptor string, including any generics.
173:             */
174:            //public abstract String getGenericDescriptor();
175:            /**
176:             * Returns the described return type, which is TypeDesc.VOID if void.
177:             */
178:            public TypeDesc getReturnType() {
179:                return mRetType;
180:            }
181:
182:            public int getParameterCount() {
183:                return mParams.length;
184:            }
185:
186:            public TypeDesc[] getParameterTypes() {
187:                TypeDesc[] params = mParams;
188:                return (params != EMPTY_PARAMS) ? (TypeDesc[]) params.clone()
189:                        : params;
190:            }
191:
192:            /**
193:             * Returns this in Java method signature syntax.
194:             *
195:             * @param name method name
196:             */
197:            public String toMethodSignature(String name) {
198:                return toMethodSignature(name, false);
199:            }
200:
201:            /**
202:             * Returns this in Java method signature syntax.
203:             *
204:             * @param name method name
205:             * @param varargs request that the last argument, if it is an array, to
206:             * be formatted in varargs syntax.
207:             */
208:            public String toMethodSignature(String name, boolean varargs) {
209:                StringBuffer buf = new StringBuffer();
210:                buf.append(mRetType.getFullName());
211:                buf.append(' ');
212:                buf.append(name);
213:                buf.append('(');
214:
215:                TypeDesc[] params = mParams;
216:                for (int i = 0; i < params.length; i++) {
217:                    if (i > 0) {
218:                        buf.append(", ");
219:                    }
220:                    TypeDesc param = params[i];
221:                    if (varargs && param.isArray() && i == (params.length - 1)) {
222:                        buf.append(param.getComponentType().getFullName());
223:                        buf.append("...");
224:                    } else {
225:                        buf.append(param.getFullName());
226:                    }
227:                }
228:
229:                return buf.append(')').toString();
230:            }
231:
232:            public String toString() {
233:                // TODO: Return generic descriptor
234:                return mDescriptor;
235:            }
236:
237:            public int hashCode() {
238:                return mDescriptor.hashCode();
239:            }
240:
241:            public boolean equals(Object other) {
242:                if (this  == other) {
243:                    return true;
244:                }
245:                if (other instanceof  MethodDesc) {
246:                    return ((MethodDesc) other).mDescriptor.equals(mDescriptor);
247:                }
248:                return false;
249:            }
250:
251:            Object writeReplace() throws ObjectStreamException {
252:                return new External(mDescriptor);
253:            }
254:
255:            private static String generateDescriptor(TypeDesc ret,
256:                    TypeDesc[] params) {
257:                int length = ret.getDescriptor().length() + 2;
258:                int paramsLength = params.length;
259:                for (int i = paramsLength; --i >= 0;) {
260:                    length += params[i].getDescriptor().length();
261:                }
262:                char[] buf = new char[length];
263:                buf[0] = '(';
264:                int index = 1;
265:                String paramDesc;
266:                for (int i = 0; i < paramsLength; i++) {
267:                    paramDesc = params[i].getDescriptor();
268:                    int paramDescLength = paramDesc.length();
269:                    paramDesc.getChars(0, paramDescLength, buf, index);
270:                    index += paramDescLength;
271:                }
272:                buf[index++] = ')';
273:                paramDesc = ret.getDescriptor();
274:                paramDesc.getChars(0, paramDesc.length(), buf, index);
275:                return new String(buf);
276:            }
277:
278:            private static class External implements  Externalizable {
279:                private String mDescriptor;
280:
281:                public External() {
282:                }
283:
284:                public External(String desc) {
285:                    mDescriptor = desc;
286:                }
287:
288:                public void writeExternal(ObjectOutput out) throws IOException {
289:                    out.writeUTF(mDescriptor);
290:                }
291:
292:                public void readExternal(ObjectInput in) throws IOException {
293:                    mDescriptor = in.readUTF();
294:                }
295:
296:                public Object readResolve() throws ObjectStreamException {
297:                    return forDescriptor(mDescriptor);
298:                }
299:            }
300:        }
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