Source Code Cross Referenced for Method.java in  » Database-DBMS » db4o-6.4 » EDU » purdue » cs » bloat » file » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » EDU.purdue.cs.bloat.file 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (C) 2004 - 2007  db4objects Inc.  http://www.db4o.com
002:
003:        This file is part of the db4o open source object database.
004:
005:        db4o is free software; you can redistribute it and/or modify it under
006:        the terms of version 2 of the GNU General Public License as published
007:        by the Free Software Foundation and as clarified by db4objects' GPL 
008:        interpretation policy, available at
009:        http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
010:        Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
011:        Suite 350, San Mateo, CA 94403, USA.
012:
013:        db4o is distributed in the hope that it will be useful, but WITHOUT ANY
014:        WARRANTY; without even the implied warranty of MERCHANTABILITY or
015:        FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
016:        for more details.
017:
018:        You should have received a copy of the GNU General Public License along
019:        with this program; if not, write to the Free Software Foundation, Inc.,
020:        59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
021:        package EDU.purdue.cs.bloat.file;
022:
023:        import java.io.*;
024:
025:        import EDU.purdue.cs.bloat.reflect.*;
026:        import EDU.purdue.cs.bloat.util.*;
027:
028:        /**
029:         * Method represents a method in a Java classfile. A method's name and value
030:         * (the types of its parameters and its return type) are modeled as indices into
031:         * it class's constant pool. A method has modifiers that determine whether it is
032:         * public, private, static, final, etc. Methods have a number of attributes such
033:         * as their Code and any Exceptions they may throw.
034:         * 
035:         * @see Code
036:         * @see Exceptions
037:         * 
038:         * @author Nate Nystrom (<a
039:         *         href="mailto:nystrom@cs.purdue.edu">nystrom@cs.purdue.edu</a>)
040:         */
041:        public class Method implements  MethodInfo {
042:            private ClassInfo classInfo;
043:
044:            private int modifiers;
045:
046:            private int name;
047:
048:            private int type;
049:
050:            private Attribute[] attrs;
051:
052:            private Code code;
053:
054:            private Exceptions exceptions;
055:
056:            public static boolean DEBUG = Boolean.getBoolean("Method.DEBUG");
057:
058:            /**
059:             * Constructor for creating a <code>Method</code> from scratch
060:             * 
061:             * @param attrs
062:             *            Must include <code>code</code> and <code>exceptions</code>
063:             *            which are themselves attributes of this method
064:             */
065:            Method(final ClassInfo classInfo, final int modifiers,
066:                    final int name, final int type, final Attribute[] attrs,
067:                    final Code code, final Exceptions exceptions) {
068:                this .classInfo = classInfo;
069:                this .modifiers = modifiers;
070:                this .name = name;
071:                this .type = type;
072:
073:                Assert
074:                        .isNotNull(attrs,
075:                                "Every method must have at least a Code "
076:                                        + "attribute");
077:                this .attrs = attrs;
078:                this .code = code;
079:                this .exceptions = exceptions;
080:            }
081:
082:            /**
083:             * Constructor. Read a method from a class file.
084:             * 
085:             * @param in
086:             *            The data stream of the class file.
087:             * @param classInfo
088:             *            The class file containing the method.
089:             * @exception IOException
090:             *                If an error occurs while reading.
091:             */
092:            public Method(final DataInputStream in, final ClassInfo classInfo)
093:                    throws IOException {
094:                this .classInfo = classInfo;
095:
096:                modifiers = in.readUnsignedShort();
097:
098:                name = in.readUnsignedShort();
099:                type = in.readUnsignedShort();
100:
101:                final int numAttributes = in.readUnsignedShort();
102:
103:                attrs = new Attribute[numAttributes];
104:
105:                for (int i = 0; i < numAttributes; i++) {
106:                    final int nameIndex = in.readUnsignedShort();
107:                    final int length = in.readInt();
108:
109:                    final Constant name = classInfo.constants()[nameIndex];
110:
111:                    if (name != null) {
112:                        if ("Code".equals(name.value())) {
113:                            code = new Code(classInfo, in, nameIndex, length);
114:                            attrs[i] = code;
115:                        } else if ("Exceptions".equals(name.value())) {
116:                            exceptions = new Exceptions(classInfo, in,
117:                                    nameIndex, length);
118:                            attrs[i] = exceptions;
119:                        }
120:                    }
121:
122:                    if (attrs[i] == null) {
123:                        attrs[i] = new GenericAttribute(in, nameIndex, length);
124:                    }
125:                }
126:            }
127:
128:            /**
129:             * Get the class which declared the method.
130:             * 
131:             * @return The ClassInfo of the class which declared the method.
132:             */
133:            public ClassInfo declaringClass() {
134:                return classInfo;
135:            }
136:
137:            /**
138:             * Set the index into the constant pool of the name of the method.
139:             * 
140:             * @param name
141:             *            The index into the constant pool of the name of the method.
142:             */
143:            public void setNameIndex(final int name) {
144:                this .name = name;
145:            }
146:
147:            /**
148:             * Set the index into the constant pool of the type of the method.
149:             * 
150:             * @param type
151:             *            The index into the constant pool of the type of the method.
152:             */
153:            public void setTypeIndex(final int type) {
154:                this .type = type;
155:            }
156:
157:            /**
158:             * Get the index into the constant pool of the name of the method.
159:             * 
160:             * @return The index into the constant pool of the name of the method.
161:             */
162:            public int nameIndex() {
163:                return name;
164:            }
165:
166:            /**
167:             * Get the index into the constant pool of the type of the method.
168:             * 
169:             * @return The index into the constant pool of the type of the method.
170:             */
171:            public int typeIndex() {
172:                return type;
173:            }
174:
175:            /**
176:             * Set the modifiers of the method. The values correspond to the constants
177:             * in the Modifiers class.
178:             * 
179:             * @param modifiers
180:             *            A bit vector of modifier flags for the method.
181:             * @see Modifiers
182:             */
183:            public void setModifiers(final int modifiers) {
184:                this .modifiers = modifiers;
185:            }
186:
187:            /**
188:             * Get the modifiers of the method. The values correspond to the constants
189:             * in the Modifiers class.
190:             * 
191:             * @return A bit vector of modifier flags for the method.
192:             * @see Modifiers
193:             */
194:            public int modifiers() {
195:                return modifiers;
196:            }
197:
198:            /**
199:             * Get the maximum height of the operand stack.
200:             * 
201:             * @return The maximum height of the operand stack.
202:             */
203:            public int maxStack() {
204:                if (code != null) {
205:                    return code.maxStack();
206:                }
207:                return 0;
208:            }
209:
210:            /**
211:             * Set the maximum height of the operand stack.
212:             * 
213:             * @param maxStack
214:             *            The maximum height of the operand stack.
215:             */
216:            public void setMaxStack(final int maxStack) {
217:                if (code != null) {
218:                    code.setMaxStack(maxStack);
219:                }
220:            }
221:
222:            /**
223:             * Get the maximum number of locals used in the method.
224:             * 
225:             * @return The maximum number of locals used in the method.
226:             */
227:            public int maxLocals() {
228:                if (code != null) {
229:                    return code.maxLocals();
230:                }
231:                return 0;
232:            }
233:
234:            /**
235:             * Set the maximum number of locals used in the method.
236:             * 
237:             * @param maxLocals
238:             *            The maximum number of locals used in the method.
239:             */
240:            public void setMaxLocals(final int maxLocals) {
241:                if (code != null) {
242:                    code.setMaxLocals(maxLocals);
243:                }
244:            }
245:
246:            /**
247:             * Get the byte code array of the method.
248:             * 
249:             * @return The byte code array of the method.
250:             */
251:            public byte[] code() {
252:                if (code != null) {
253:                    return code.code();
254:                }
255:                return new byte[0];
256:            }
257:
258:            /**
259:             * Returns the length of the Code array.
260:             */
261:            public int codeLength() {
262:                if (code != null) {
263:                    return (code.codeLength());
264:                } else {
265:                    return (0);
266:                }
267:            }
268:
269:            /**
270:             * Set the byte code array of the method.
271:             * 
272:             * @param bytes
273:             *            The byte code array of the method.
274:             */
275:            public void setCode(final byte[] bytes) {
276:                if (code != null) {
277:                    code.setCode(bytes);
278:                    if (Method.DEBUG) {
279:                        System.out.println("Set code with " + bytes.length
280:                                + " bytes");
281:                        // Thread.dumpStack();
282:                    }
283:                }
284:            }
285:
286:            /**
287:             * Get the indices into the constant pool of the types of the exceptions
288:             * thrown by the method.
289:             * 
290:             * @return The indices into the constant pool of the types of the exceptions
291:             *         thrown by the method.
292:             */
293:            public int[] exceptionTypes() {
294:                if (exceptions != null) {
295:                    return exceptions.exceptionTypes();
296:                }
297:                return new int[0];
298:            }
299:
300:            /**
301:             * Set the line numbers of the instructions in the method.
302:             * 
303:             * @param lineNumbers
304:             *            The line numbers of the instructions in the method.
305:             */
306:            public void setLineNumbers(final LineNumberDebugInfo[] lineNumbers) {
307:                if (code != null) {
308:                    code.setLineNumbers(lineNumbers);
309:                }
310:            }
311:
312:            /**
313:             * Set the local variable debug info for the method.
314:             * 
315:             * @param locals
316:             *            The local variable debug info for the method.
317:             */
318:            public void setLocals(final LocalDebugInfo[] locals) {
319:                if (code != null) {
320:                    code.setLocals(locals);
321:                }
322:            }
323:
324:            /**
325:             * Get the line numbers of the instructions in the method.
326:             * 
327:             * @return The line numbers of the instructions in the method.
328:             */
329:            public LineNumberDebugInfo[] lineNumbers() {
330:                if (code != null) {
331:                    return code.lineNumbers();
332:                }
333:                return new LineNumberDebugInfo[0];
334:            }
335:
336:            /**
337:             * Get the local variable debug info for the method.
338:             * 
339:             * @return The local variable debug info for the method.
340:             */
341:            public LocalDebugInfo[] locals() {
342:                if (code != null) {
343:                    return code.locals();
344:                }
345:                return new LocalDebugInfo[0];
346:            }
347:
348:            /**
349:             * Get the exception handlers in the method.
350:             * 
351:             * @return The exception handlers in the method.
352:             */
353:            public Catch[] exceptionHandlers() {
354:                if (code != null) {
355:                    return code.exceptionHandlers();
356:                }
357:                return new Catch[0];
358:            }
359:
360:            /**
361:             * Set the exception handlers in the method.
362:             * 
363:             * @param handlers
364:             *            The exception handlers in the method.
365:             */
366:            public void setExceptionHandlers(final Catch[] handlers) {
367:                if (code != null) {
368:                    code.setExceptionHandlers(handlers);
369:                }
370:            }
371:
372:            /**
373:             * Write the method to a class file.
374:             * 
375:             * @param out
376:             *            The data stream of the class file.
377:             * @exception IOException
378:             *                If an error occurs while writing.
379:             */
380:            public void write(final DataOutputStream out) throws IOException {
381:                if (Method.DEBUG) {
382:                    System.out.println("Writing method " + this );
383:                    System.out.println("  Masked Modifiers: "
384:                            + (modifiers & 0xf000));
385:                }
386:
387:                out.writeShort(modifiers);
388:
389:                out.writeShort(name);
390:                out.writeShort(type);
391:
392:                out.writeShort(attrs.length);
393:
394:                for (int i = 0; i < attrs.length; i++) {
395:                    if (Method.DEBUG) {
396:                        System.out.println("  " + attrs[i]);
397:                    }
398:                    out.writeShort(attrs[i].nameIndex());
399:                    out.writeInt(attrs[i].length());
400:                    attrs[i].writeData(out);
401:                }
402:            }
403:
404:            /**
405:             * Returns a string representation of the method.
406:             */
407:            public String toString() {
408:                String x = "";
409:
410:                x += " (modifiers";
411:
412:                if ((modifiers & Modifiers.PUBLIC) != 0) {
413:                    x += " PUBLIC";
414:                }
415:                if ((modifiers & Modifiers.PRIVATE) != 0) {
416:                    x += " PRIVATE";
417:                }
418:                if ((modifiers & Modifiers.PROTECTED) != 0) {
419:                    x += " PROTECTED";
420:                }
421:                if ((modifiers & Modifiers.STATIC) != 0) {
422:                    x += " STATIC";
423:                }
424:                if ((modifiers & Modifiers.FINAL) != 0) {
425:                    x += " FINAL";
426:                }
427:                if ((modifiers & Modifiers.SYNCHRONIZED) != 0) {
428:                    x += " SYNCHRONIZED";
429:                }
430:                if ((modifiers & Modifiers.VOLATILE) != 0) {
431:                    x += " VOLATILE";
432:                }
433:                if ((modifiers & Modifiers.TRANSIENT) != 0) {
434:                    x += " TRANSIENT";
435:                }
436:                if ((modifiers & Modifiers.NATIVE) != 0) {
437:                    x += " NATIVE";
438:                }
439:                if ((modifiers & Modifiers.INTERFACE) != 0) {
440:                    x += " INTERFACE";
441:                }
442:                if ((modifiers & Modifiers.ABSTRACT) != 0) {
443:                    x += " ABSTRACT";
444:                }
445:                x += ")";
446:
447:                return "(method " + name + " " + type + x
448:                        + (code != null ? "\n      " + code : "")
449:                        + (exceptions != null ? "\n      " + exceptions : "")
450:                        + ")";
451:            }
452:
453:            /**
454:             * Constructor used for cloning a <code>Method</code>
455:             */
456:            private Method(final ClassInfo classInfo, final int modifiers,
457:                    final int name, final int type, final Attribute[] attrs) {
458:                this .classInfo = classInfo;
459:                this .modifiers = modifiers;
460:                this .name = name;
461:                this .type = type;
462:
463:                if (attrs != null) {
464:                    this .attrs = new Attribute[attrs.length];
465:                    for (int i = 0; i < attrs.length; i++) {
466:                        final Attribute attr = (Attribute) attrs[i].clone();
467:                        if (attr instanceof  Code) {
468:                            this .code = (Code) attr;
469:
470:                        } else if (attr instanceof  Exceptions) {
471:                            this .exceptions = (Exceptions) attr;
472:                        }
473:                        this .attrs[i] = attr;
474:                    }
475:                }
476:
477:                Assert.isTrue(code != null, "No Code in attributes");
478:                Assert
479:                        .isTrue(exceptions != null,
480:                                "No Exceptions in attributes");
481:            }
482:
483:            /**
484:             * Creates a clone of this <tt>MethodInfo</tt> except that its declaring
485:             * class does not know about it.
486:             */
487:            public Object clone() {
488:                return (new Method(this.classInfo, this.modifiers, this.name,
489:                        this.type, this.attrs));
490:            }
491:        }
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