Source Code Cross Referenced for ProxyCompiler.java in  » Aspect-oriented » aspectwerkz-2.0 » org » codehaus » aspectwerkz » proxy » 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.proxy 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**************************************************************************************
002:         * Copyright (c) Jonas Bonér, Alexandre Vasseur. All rights reserved.                 *
003:         * http://aspectwerkz.codehaus.org                                                    *
004:         * ---------------------------------------------------------------------------------- *
005:         * The software in this package is published under the terms of the LGPL license      *
006:         * a copy of which has been included with this distribution in the license.txt file.  *
007:         **************************************************************************************/package org.codehaus.aspectwerkz.proxy;
008:
009:        import java.lang.reflect.Method;
010:        import java.lang.reflect.Modifier;
011:        import java.lang.reflect.Constructor;
012:        import java.io.IOException;
013:        import java.io.InputStream;
014:        import java.io.BufferedInputStream;
015:        import java.io.ByteArrayInputStream;
016:
017:        import org.codehaus.aspectwerkz.transform.TransformationConstants;
018:        import org.codehaus.aspectwerkz.transform.inlining.AsmHelper;
019:        import org.codehaus.aspectwerkz.reflect.ReflectHelper;
020:        import org.codehaus.aspectwerkz.util.ContextClassLoader;
021:        import org.codehaus.aspectwerkz.exception.WrappedRuntimeException;
022:        import org.codehaus.aspectwerkz.annotation.instrumentation.asm.AsmAnnotationHelper;
023:        import org.objectweb.asm.ClassWriter;
024:        import org.objectweb.asm.CodeVisitor;
025:        import org.objectweb.asm.Type;
026:        import org.objectweb.asm.ClassReader;
027:        import org.objectweb.asm.ClassAdapter;
028:        import org.objectweb.asm.ClassVisitor;
029:        import org.objectweb.asm.Attribute;
030:        import org.objectweb.asm.attrs.Attributes;
031:
032:        /**
033:         * Compiler for the AspectWerkz proxies.
034:         * <p/>
035:         * Creates a subclass of the target class and adds delegate methods to all the non-private and non-final
036:         * methods/constructors which delegates to the super class.
037:         * <p/>
038:         * The annotations are copied.
039:         *
040:         * @author <a href="mailto:alex AT gnilux DOT com">Alexandre Vasseur</a>
041:         * @author <a href="mailto:jboner@codehaus.org">Jonas BonŽr</a>
042:         */
043:        public class ProxyCompiler implements  TransformationConstants {
044:            private final static String[] EMPTY_STRING_ARRAY = new String[0];
045:
046:            /**
047:             * Returns an InputStream that would be the one of the AWproxy for the given proxy class name
048:             * Used to read annotations from proxy f.e.
049:             *
050:             * @param loader
051:             * @param proxyClassName
052:             * @return or null if not found
053:             */
054:            public static InputStream getProxyResourceAsStream(
055:                    final ClassLoader loader, final String proxyClassName) {
056:                String className = Proxy
057:                        .getUniqueClassNameFromProxy(proxyClassName);
058:                if (className != null) {
059:                    byte[] proxy = compileProxyFor(loader, className,
060:                            proxyClassName);
061:                    return new BufferedInputStream(new ByteArrayInputStream(
062:                            proxy));
063:                } else {
064:                    return null;
065:                }
066:            }
067:
068:            /**
069:             * Compiles a new proxy for the class specified.
070:             *
071:             * @param clazz
072:             * @param proxyClassName
073:             * @return the byte code
074:             */
075:            public static byte[] compileProxyFor(final Class clazz,
076:                    final String proxyClassName) {
077:                return compileProxyFor(clazz.getClassLoader(), clazz.getName(),
078:                        proxyClassName);
079:            }
080:
081:            /**
082:             * Compiles a new proxy for the class specified.
083:             *
084:             * @param loader
085:             * @param className
086:             * @param proxyClassName
087:             * @return the byte code
088:             */
089:            public static byte[] compileProxyFor(final ClassLoader loader,
090:                    final String className, final String proxyClassName) {
091:
092:                final String targetClassName = className.replace('.', '/');
093:                final ClassWriter proxyWriter = AsmHelper.newClassWriter(true);
094:
095:                InputStream in = null;
096:                final ClassReader classReader;
097:                try {
098:                    if (loader != null) {
099:                        in = loader.getResourceAsStream(targetClassName
100:                                + ".class");
101:                    } else {
102:                        in = ClassLoader
103:                                .getSystemClassLoader()
104:                                .getResourceAsStream(targetClassName + ".class");
105:                    }
106:                    classReader = new ClassReader(in);
107:                } catch (IOException e) {
108:                    throw new WrappedRuntimeException(
109:                            "Cannot compile proxy for " + className, e);
110:                } finally {
111:                    try {
112:                        in.close();
113:                    } catch (Throwable t) {
114:                        ;
115:                    }
116:                }
117:
118:                ClassVisitor createProxy = new ProxyCompilerClassVisitor(
119:                        proxyWriter, proxyClassName.replace('.', '/'));
120:                classReader.accept(createProxy, Attributes
121:                        .getDefaultAttributes(), true);// no need for debug info
122:                return proxyWriter.toByteArray();
123:            }
124:
125:            /**
126:             * Visit the class and create the proxy that delegates to super.
127:             *
128:             * @author <a href="mailto:alex AT gnilux DOT com">Alexandre Vasseur</a>
129:             */
130:            private static class ProxyCompilerClassVisitor extends
131:                    AsmAnnotationHelper.NullClassAdapter {
132:
133:                final private ClassVisitor m_proxyCv;
134:                final private String m_proxyClassName;
135:                private String m_className;
136:
137:                public ProxyCompilerClassVisitor(final ClassVisitor proxyCv,
138:                        final String proxyClassName) {
139:                    m_proxyCv = proxyCv;
140:                    m_proxyClassName = proxyClassName;
141:                }
142:
143:                /**
144:                 * Visits the class.
145:                 *
146:                 * @param access
147:                 * @param name
148:                 * @param superName
149:                 * @param interfaces
150:                 * @param sourceFile
151:                 */
152:                public void visit(final int version, final int access,
153:                        final String name, final String super Name,
154:                        final String[] interfaces, final String sourceFile) {
155:                    if (Modifier.isFinal(access)) {
156:                        throw new RuntimeException(
157:                                "Cannot create a proxy from final class "
158:                                        + name);
159:                    }
160:                    m_className = name;
161:                    m_proxyCv.visit(version, ACC_PUBLIC + ACC_SUPER
162:                            + ACC_SYNTHETIC,
163:                            m_proxyClassName.replace('.', '/'), name,
164:                            interfaces, null);
165:                }
166:
167:                /**
168:                 * Visits the methods.
169:                 *
170:                 * @param access
171:                 * @param name
172:                 * @param desc
173:                 * @param exceptions
174:                 * @param attrs
175:                 * @return
176:                 */
177:                public CodeVisitor visitMethod(final int access,
178:                        final String name, final String desc,
179:                        final String[] exceptions, final Attribute attrs) {
180:                    if (Modifier.isFinal(access) || Modifier.isPrivate(access)
181:                            || Modifier.isNative(access)) {
182:                        // skip final or private or native methods
183:                        // TODO we could proxy native methods but that would lead to difference with regular weaving
184:                        ;
185:                    } else if (CLINIT_METHOD_NAME.equals(name)) {
186:                        // skip clinit
187:                        ;
188:                    } else if (INIT_METHOD_NAME.equals(name)) {
189:                        // constructors
190:                        CodeVisitor proxyCode = m_proxyCv.visitMethod(access
191:                                + ACC_SYNTHETIC, INIT_METHOD_NAME, desc,
192:                                exceptions, attrs);
193:
194:                        proxyCode.visitVarInsn(ALOAD, 0);
195:                        AsmHelper.loadArgumentTypes(proxyCode, Type
196:                                .getArgumentTypes(desc), false);
197:                        proxyCode.visitMethodInsn(INVOKESPECIAL, m_className,
198:                                INIT_METHOD_NAME, desc);
199:                        proxyCode.visitInsn(RETURN);
200:                        proxyCode.visitMaxs(0, 0);
201:                    } else {
202:                        // method that can be proxied
203:                        CodeVisitor proxyCode = m_proxyCv.visitMethod(access
204:                                + ACC_SYNTHETIC, name, desc, exceptions, attrs);
205:
206:                        if (Modifier.isStatic(access)) {
207:                            AsmHelper.loadArgumentTypes(proxyCode, Type
208:                                    .getArgumentTypes(desc), true);
209:                            proxyCode.visitMethodInsn(INVOKESTATIC,
210:                                    m_className, name, desc);
211:                            AsmHelper.addReturnStatement(proxyCode, Type
212:                                    .getReturnType(desc));
213:                            proxyCode.visitMaxs(0, 0);
214:                        } else {
215:                            proxyCode.visitVarInsn(ALOAD, 0);
216:                            AsmHelper.loadArgumentTypes(proxyCode, Type
217:                                    .getArgumentTypes(desc), false);
218:                            proxyCode.visitMethodInsn(INVOKESPECIAL,
219:                                    m_className, name, desc);
220:                            AsmHelper.addReturnStatement(proxyCode, Type
221:                                    .getReturnType(desc));
222:                            proxyCode.visitMaxs(0, 0);
223:                        }
224:                    }
225:
226:                    return AsmAnnotationHelper.NullCodeAdapter.NULL_CODE_ADAPTER;
227:                }
228:            }
229:
230:            //    /**
231:            //     * Creates constructors that delgates to the matching base class constructors.
232:            //     * Skips all private constructors.
233:            //     *
234:            //     * @param writer
235:            //     * @param clazz
236:            //     * @param targetClassName
237:            //     */
238:            //    private static void createConstructorDelegators(final ClassWriter writer,
239:            //                                                    final Class clazz,
240:            //                                                    final String targetClassName) {
241:            //        CodeVisitor cv;
242:            //        Constructor[] constructors = clazz.getDeclaredConstructors();
243:            //        for (int i = 0; i < constructors.length; i++) {
244:            //            Constructor constructor = constructors[i];
245:            //            int mods = constructor.getModifiers();
246:            //            if (!Modifier.isPrivate(mods) && !Modifier.isFinal(mods)) {
247:            //                Class[] exceptionClasses = constructor.getExceptionTypes();
248:            //                String[] exceptionTypeNames = new String[constructor.getExceptionTypes().length];
249:            //                for (int j = 0; j < exceptionTypeNames.length; j++) {
250:            //                    exceptionTypeNames[j] = exceptionClasses[j].getName().replace('.', '/');
251:            //                }
252:            //                final String desc = ReflectHelper.getConstructorSignature(constructor);
253:            //                cv = writer.visitMethod(
254:            //                        mods + ACC_SYNTHETIC,
255:            //                        INIT_METHOD_NAME,
256:            //                        desc,
257:            //                        exceptionTypeNames,
258:            //                        null
259:            //                );
260:            //
261:            //                cv.visitVarInsn(ALOAD, 0);
262:            //                AsmHelper.loadArgumentTypes(cv, Type.getArgumentTypes(desc), false);
263:            //
264:            //                cv.visitMethodInsn(INVOKESPECIAL, targetClassName, INIT_METHOD_NAME, desc);
265:            //
266:            //                cv.visitInsn(RETURN);
267:            //                cv.visitMaxs(0, 0);
268:            //            }
269:            //        }
270:            //    }
271:            //
272:            //    /**
273:            //     * Creates method methods that delgates to the base class method.
274:            //     * Skips all private and final methods.
275:            //     *
276:            //     * @param writer
277:            //     * @param clazz
278:            //     * @param targetClassName
279:            //     */
280:            //    private static void createMethodDelegators(final ClassWriter writer,
281:            //                                               final Class clazz,
282:            //                                               final String targetClassName) {
283:            //        CodeVisitor cv;
284:            //        Method[] methods = clazz.getDeclaredMethods();
285:            //        for (int i = 0; i < methods.length; i++) {
286:            //            Method method = methods[i];
287:            //            int mods = method.getModifiers();
288:            //            if (!Modifier.isPrivate(mods) && !Modifier.isFinal(mods)) {
289:            //
290:            //                Class[] exceptionClasses = method.getExceptionTypes();
291:            //                String[] exceptionTypeNames = new String[method.getExceptionTypes().length];
292:            //                for (int j = 0; j < exceptionTypeNames.length; j++) {
293:            //                    exceptionTypeNames[j] = exceptionClasses[j].getName().replace('.', '/');
294:            //                }
295:            //                final String methodName = method.getName();
296:            //                final String desc = Type.getMethodDescriptor(method);
297:            //
298:            //                cv = writer.visitMethod(
299:            //                        mods + ACC_SYNTHETIC,
300:            //                        methodName,
301:            //                        desc,
302:            //                        exceptionTypeNames,
303:            //                        null
304:            //                );
305:            //
306:            //                if (Modifier.isStatic(mods)) {
307:            //                    AsmHelper.loadArgumentTypes(cv, Type.getArgumentTypes(desc), true);
308:            //                    cv.visitMethodInsn(INVOKESTATIC, targetClassName, methodName, desc);
309:            //                } else {
310:            //                    cv.visitVarInsn(ALOAD, 0);
311:            //                    AsmHelper.loadArgumentTypes(cv, Type.getArgumentTypes(desc), false);
312:            //                    cv.visitMethodInsn(INVOKESPECIAL, targetClassName, methodName, desc);
313:            //                }
314:            //
315:            //                AsmHelper.addReturnStatement(cv, Type.getReturnType(method));
316:            //                cv.visitMaxs(0, 0);
317:            //            }
318:            //        }
319:            //    }
320:        }
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