Source Code Cross Referenced for MethodInfo.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.util.ArrayList;
020:        import java.util.List;
021:        import java.io.DataInput;
022:        import java.io.DataOutput;
023:        import java.io.IOException;
024:        import java.lang.reflect.Modifier;
025:        import org.cojen.classfile.attribute.Annotation;
026:        import org.cojen.classfile.attribute.AnnotationsAttr;
027:        import org.cojen.classfile.attribute.CodeAttr;
028:        import org.cojen.classfile.attribute.DeprecatedAttr;
029:        import org.cojen.classfile.attribute.EnclosingMethodAttr;
030:        import org.cojen.classfile.attribute.ExceptionsAttr;
031:        import org.cojen.classfile.attribute.RuntimeInvisibleAnnotationsAttr;
032:        import org.cojen.classfile.attribute.RuntimeVisibleAnnotationsAttr;
033:        import org.cojen.classfile.attribute.SignatureAttr;
034:        import org.cojen.classfile.attribute.SourceFileAttr;
035:        import org.cojen.classfile.attribute.SyntheticAttr;
036:        import org.cojen.classfile.constant.ConstantClassInfo;
037:        import org.cojen.classfile.constant.ConstantUTFInfo;
038:
039:        /**
040:         * This class corresponds to the method_info data structure as defined in
041:         * section 4.6 of <i>The Java Virtual Machine Specification</i>. 
042:         * To make it easier to create bytecode for a method's CodeAttr, the 
043:         * CodeBuilder class is provided.
044:         * 
045:         * @author Brian S O'Neill
046:         * @see ClassFile
047:         * @see CodeBuilder
048:         */
049:        public class MethodInfo {
050:            private ClassFile mParent;
051:            private ConstantPool mCp;
052:
053:            private String mName;
054:            private MethodDesc mDesc;
055:
056:            private Modifiers mModifiers;
057:
058:            private ConstantUTFInfo mNameConstant;
059:            private ConstantUTFInfo mDescriptorConstant;
060:
061:            private List mAttributes = new ArrayList(2);
062:
063:            private CodeAttr mCode;
064:            private ExceptionsAttr mExceptions;
065:
066:            private int mAnonymousInnerClassCount = 0;
067:
068:            MethodInfo(ClassFile parent, Modifiers modifiers, String name,
069:                    MethodDesc desc) {
070:
071:                mParent = parent;
072:                mCp = parent.getConstantPool();
073:                mName = name;
074:                mDesc = desc;
075:
076:                mModifiers = modifiers;
077:                mNameConstant = mCp.addConstantUTF(name);
078:                mDescriptorConstant = mCp.addConstantUTF(desc.getDescriptor());
079:
080:                if (!modifiers.isAbstract() && !modifiers.isNative()) {
081:                    addAttribute(new CodeAttr(mCp));
082:                }
083:            }
084:
085:            private MethodInfo(ClassFile parent, int modifier,
086:                    ConstantUTFInfo nameConstant, ConstantUTFInfo descConstant) {
087:
088:                mParent = parent;
089:                mCp = parent.getConstantPool();
090:                mName = nameConstant.getValue();
091:                mDesc = MethodDesc.forDescriptor(descConstant.getValue());
092:
093:                mModifiers = Modifiers.getInstance(modifier);
094:                mNameConstant = nameConstant;
095:                mDescriptorConstant = descConstant;
096:            }
097:
098:            /**
099:             * Returns the parent ClassFile for this MethodInfo.
100:             */
101:            public ClassFile getClassFile() {
102:                return mParent;
103:            }
104:
105:            /**
106:             * Returns the name of this method.
107:             */
108:            public String getName() {
109:                return mName;
110:            }
111:
112:            /**
113:             * Returns a MethodDesc which describes return and parameter types
114:             * of this method.
115:             */
116:            public MethodDesc getMethodDescriptor() {
117:                return mDesc;
118:            }
119:
120:            /**
121:             * Returns this method's modifiers.
122:             */
123:            public Modifiers getModifiers() {
124:                return mModifiers;
125:            }
126:
127:            public void setModifiers(Modifiers modifiers) {
128:                mModifiers = modifiers;
129:            }
130:
131:            /**
132:             * Returns a constant from the constant pool with this method's name.
133:             */
134:            public ConstantUTFInfo getNameConstant() {
135:                return mNameConstant;
136:            }
137:
138:            /**
139:             * Returns a constant from the constant pool with this method's type 
140:             * descriptor string.
141:             * @see MethodDesc
142:             */
143:            public ConstantUTFInfo getDescriptorConstant() {
144:                return mDescriptorConstant;
145:            }
146:
147:            /**
148:             * Returns the exceptions that this method is declared to throw.
149:             */
150:            public TypeDesc[] getExceptions() {
151:                if (mExceptions == null) {
152:                    return new TypeDesc[0];
153:                }
154:
155:                ConstantClassInfo[] classes = mExceptions.getExceptions();
156:                TypeDesc[] types = new TypeDesc[classes.length];
157:                for (int i = 0; i < types.length; i++) {
158:                    types[i] = classes[i].getType();
159:                }
160:
161:                return types;
162:            }
163:
164:            /**
165:             * Returns a CodeAttr object used to manipulate the method code body, or
166:             * null if this method is abstract or native.
167:             */
168:            public CodeAttr getCodeAttr() {
169:                return mCode;
170:            }
171:
172:            public boolean isSynthetic() {
173:                for (int i = mAttributes.size(); --i >= 0;) {
174:                    Object obj = mAttributes.get(i);
175:                    if (obj instanceof  SyntheticAttr) {
176:                        return true;
177:                    }
178:                }
179:                return false;
180:            }
181:
182:            public boolean isDeprecated() {
183:                for (int i = mAttributes.size(); --i >= 0;) {
184:                    Object obj = mAttributes.get(i);
185:                    if (obj instanceof  DeprecatedAttr) {
186:                        return true;
187:                    }
188:                }
189:                return false;
190:            }
191:
192:            /**
193:             * Returns all the runtime invisible annotations defined for this class
194:             * file, or an empty array if none.
195:             */
196:            public Annotation[] getRuntimeInvisibleAnnotations() {
197:                for (int i = mAttributes.size(); --i >= 0;) {
198:                    Object obj = mAttributes.get(i);
199:                    if (obj instanceof  RuntimeInvisibleAnnotationsAttr) {
200:                        return ((AnnotationsAttr) obj).getAnnotations();
201:                    }
202:                }
203:                return new Annotation[0];
204:            }
205:
206:            /**
207:             * Returns all the runtime visible annotations defined for this class file,
208:             * or an empty array if none.
209:             */
210:            public Annotation[] getRuntimeVisibleAnnotations() {
211:                for (int i = mAttributes.size(); --i >= 0;) {
212:                    Object obj = mAttributes.get(i);
213:                    if (obj instanceof  RuntimeVisibleAnnotationsAttr) {
214:                        return ((AnnotationsAttr) obj).getAnnotations();
215:                    }
216:                }
217:                return new Annotation[0];
218:            }
219:
220:            /**
221:             * Add a runtime invisible annotation.
222:             */
223:            public Annotation addRuntimeInvisibleAnnotation(TypeDesc type) {
224:                AnnotationsAttr attr = null;
225:                for (int i = mAttributes.size(); --i >= 0;) {
226:                    Object obj = mAttributes.get(i);
227:                    if (obj instanceof  RuntimeInvisibleAnnotationsAttr) {
228:                        attr = (AnnotationsAttr) obj;
229:                    }
230:                }
231:                if (attr == null) {
232:                    attr = new RuntimeInvisibleAnnotationsAttr(mCp);
233:                    addAttribute(attr);
234:                }
235:                Annotation ann = new Annotation(mCp);
236:                ann.setType(type);
237:                attr.addAnnotation(ann);
238:                return ann;
239:            }
240:
241:            /**
242:             * Add a runtime visible annotation.
243:             */
244:            public Annotation addRuntimeVisibleAnnotation(TypeDesc type) {
245:                AnnotationsAttr attr = null;
246:                for (int i = mAttributes.size(); --i >= 0;) {
247:                    Object obj = mAttributes.get(i);
248:                    if (obj instanceof  RuntimeVisibleAnnotationsAttr) {
249:                        attr = (AnnotationsAttr) obj;
250:                    }
251:                }
252:                if (attr == null) {
253:                    attr = new RuntimeVisibleAnnotationsAttr(mCp);
254:                    addAttribute(attr);
255:                }
256:                Annotation ann = new Annotation(mCp);
257:                ann.setType(type);
258:                attr.addAnnotation(ann);
259:                return ann;
260:            }
261:
262:            /**
263:             * Returns the signature attribute of this method, or null if none is
264:             * defined.
265:             */
266:            // TODO: Eventually remove this method
267:            public SignatureAttr getSignatureAttr() {
268:                for (int i = mAttributes.size(); --i >= 0;) {
269:                    Object obj = mAttributes.get(i);
270:                    if (obj instanceof  SignatureAttr) {
271:                        return (SignatureAttr) obj;
272:                    }
273:                }
274:                return null;
275:            }
276:
277:            /** 
278:             * Add a declared exception that this method may throw.
279:             */
280:            public void addException(TypeDesc type) {
281:                if (mExceptions == null) {
282:                    addAttribute(new ExceptionsAttr(mCp));
283:                }
284:                // TODO: Special handling for generics
285:                ConstantClassInfo cci = mCp.addConstantClass(type);
286:                mExceptions.addException(cci);
287:            }
288:
289:            /**
290:             * Add an inner class to this method.
291:             *
292:             * @param innerClassName Optional short inner class name.
293:             */
294:            public ClassFile addInnerClass(String innerClassName) {
295:                return addInnerClass(innerClassName, (String) null);
296:            }
297:
298:            /**
299:             * Add an inner class to this method.
300:             *
301:             * @param innerClassName Optional short inner class name.
302:             * @param superClass Super class.
303:             */
304:            public ClassFile addInnerClass(String innerClassName,
305:                    Class super Class) {
306:                return addInnerClass(innerClassName, super Class.getName());
307:            }
308:
309:            /**
310:             * Add an inner class to this method.
311:             *
312:             * @param innerClassName Optional short inner class name.
313:             * @param superClassName Full super class name.
314:             */
315:            public ClassFile addInnerClass(String innerClassName,
316:                    String super ClassName) {
317:                ClassFile inner;
318:                if (innerClassName == null) {
319:                    inner = mParent.addInnerClass(null, null, super ClassName);
320:                } else {
321:                    String fullInnerClassName = mParent.getClassName() + '$'
322:                            + (++mAnonymousInnerClassCount) + innerClassName;
323:                    inner = mParent.addInnerClass(fullInnerClassName,
324:                            innerClassName, super ClassName);
325:                }
326:
327:                if (mParent.getMajorVersion() >= 49) {
328:                    inner.addAttribute(new EnclosingMethodAttr(mCp, mCp
329:                            .addConstantClass(mParent.getClassName()), mCp
330:                            .addConstantNameAndType(mNameConstant,
331:                                    mDescriptorConstant)));
332:                }
333:
334:                return inner;
335:            }
336:
337:            /**
338:             * Mark this method as being synthetic by adding a special attribute.
339:             */
340:            public void markSynthetic() {
341:                addAttribute(new SyntheticAttr(mCp));
342:            }
343:
344:            /**
345:             * Mark this method as being deprecated by adding a special attribute.
346:             */
347:            public void markDeprecated() {
348:                addAttribute(new DeprecatedAttr(mCp));
349:            }
350:
351:            public void addAttribute(Attribute attr) {
352:                if (attr instanceof  CodeAttr) {
353:                    if (mCode != null) {
354:                        mAttributes.remove(mCode);
355:                    }
356:                    mCode = (CodeAttr) attr;
357:                } else if (attr instanceof  ExceptionsAttr) {
358:                    if (mExceptions != null) {
359:                        mAttributes.remove(mExceptions);
360:                    }
361:                    mExceptions = (ExceptionsAttr) attr;
362:                }
363:
364:                mAttributes.add(attr);
365:            }
366:
367:            public Attribute[] getAttributes() {
368:                Attribute[] attrs = new Attribute[mAttributes.size()];
369:                return (Attribute[]) mAttributes.toArray(attrs);
370:            }
371:
372:            /**
373:             * Returns the length (in bytes) of this object in the class file.
374:             */
375:            public int getLength() {
376:                int length = 8;
377:
378:                int size = mAttributes.size();
379:                for (int i = 0; i < size; i++) {
380:                    length += ((Attribute) mAttributes.get(i)).getLength();
381:                }
382:
383:                return length;
384:            }
385:
386:            public void writeTo(DataOutput dout) throws IOException {
387:                dout.writeShort(mModifiers.getBitmask());
388:                dout.writeShort(mNameConstant.getIndex());
389:                dout.writeShort(mDescriptorConstant.getIndex());
390:
391:                int size = mAttributes.size();
392:                dout.writeShort(size);
393:                for (int i = 0; i < size; i++) {
394:                    Attribute attr = (Attribute) mAttributes.get(i);
395:                    try {
396:                        attr.writeTo(dout);
397:                    } catch (IllegalStateException e) {
398:                        IllegalStateException e2 = new IllegalStateException(e
399:                                .getMessage()
400:                                + ": " + toString());
401:                        try {
402:                            e2.initCause(e);
403:                        } catch (NoSuchMethodError e3) {
404:                        }
405:                        throw e2;
406:                    }
407:                }
408:            }
409:
410:            public String toString() {
411:                String str = mDesc.toMethodSignature(getName(), mModifiers
412:                        .isVarArgs());
413:                String modStr = mModifiers.toString();
414:                if (modStr.length() > 0) {
415:                    str = modStr + ' ' + str;
416:                }
417:                return str;
418:            }
419:
420:            static MethodInfo readFrom(ClassFile parent, DataInput din,
421:                    AttributeFactory attrFactory) throws IOException {
422:                ConstantPool cp = parent.getConstantPool();
423:
424:                int modifier = din.readUnsignedShort();
425:                int index = din.readUnsignedShort();
426:                ConstantUTFInfo nameConstant = (ConstantUTFInfo) cp
427:                        .getConstant(index);
428:                index = din.readUnsignedShort();
429:                ConstantUTFInfo descConstant = (ConstantUTFInfo) cp
430:                        .getConstant(index);
431:
432:                MethodInfo info = new MethodInfo(parent, modifier,
433:                        nameConstant, descConstant);
434:
435:                // Read attributes.
436:                int size = din.readUnsignedShort();
437:                for (int i = 0; i < size; i++) {
438:                    info.addAttribute(Attribute.readFrom(cp, din, attrFactory));
439:                }
440:
441:                return info;
442:            }
443:        }
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