Source Code Cross Referenced for ClassFactoryImpl.java in  » Web-Framework » Tapestry » org » apache » tapestry » ioc » internal » services » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » Tapestry » org.apache.tapestry.ioc.internal.services 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright 2006, 2007 The Apache Software Foundation
002:        //
003:        // Licensed under the Apache License, Version 2.0 (the "License");
004:        // you may not use this file except in compliance with the License.
005:        // You may obtain a copy of the License at
006:        //
007:        //     http://www.apache.org/licenses/LICENSE-2.0
008:        //
009:        // Unless required by applicable law or agreed to in writing, software
010:        // distributed under the License is distributed on an "AS IS" BASIS,
011:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:        // See the License for the specific language governing permissions and
013:        // limitations under the License.
014:
015:        package org.apache.tapestry.ioc.internal.services;
016:
017:        import static org.apache.tapestry.ioc.internal.util.Defense.notNull;
018:
019:        import java.lang.reflect.Constructor;
020:        import java.lang.reflect.Method;
021:
022:        import javassist.CtClass;
023:        import javassist.CtConstructor;
024:        import javassist.CtMethod;
025:
026:        import org.apache.commons.logging.Log;
027:        import org.apache.commons.logging.LogFactory;
028:        import org.apache.tapestry.ioc.Location;
029:        import org.apache.tapestry.ioc.internal.util.InternalUtils;
030:        import org.apache.tapestry.ioc.services.ClassFab;
031:        import org.apache.tapestry.ioc.services.ClassFabUtils;
032:        import org.apache.tapestry.ioc.services.ClassFactory;
033:
034:        /**
035:         * Implementation of {@link org.apache.tapestry.ioc.services.ClassFactory}.
036:         */
037:        public class ClassFactoryImpl implements  ClassFactory {
038:            private final Log _log;
039:
040:            /**
041:             * ClassPool shared by all modules (all CtClassSource instances).
042:             */
043:            private final ClassFactoryClassPool _pool;
044:
045:            private final CtClassSource _classSource;
046:
047:            private final ClassLoader _loader;
048:
049:            public ClassFactoryImpl(ClassLoader classLoader) {
050:                this (classLoader, LogFactory.getLog(ClassFactoryImpl.class));
051:            }
052:
053:            public ClassFactoryImpl() {
054:                this (Thread.currentThread().getContextClassLoader());
055:            }
056:
057:            /** Main constructor where a specific class loader and log is provided. */
058:            public ClassFactoryImpl(ClassLoader classLoader, Log log) {
059:                this (classLoader, new ClassFactoryClassPool(classLoader), log);
060:            }
061:
062:            /** Special constructor used when the class pool is provided externally. */
063:            public ClassFactoryImpl(ClassLoader classLoader,
064:                    ClassFactoryClassPool pool, Log log) {
065:                _loader = classLoader;
066:
067:                _pool = pool;
068:
069:                _classSource = new CtClassSource(_pool, classLoader);
070:
071:                _log = log;
072:            }
073:
074:            public ClassFab newClass(Class serviceInterface) {
075:                String name = ClassFabUtils.generateClassName(serviceInterface);
076:
077:                ClassFab cf = newClass(name, Object.class);
078:
079:                cf.addInterface(serviceInterface);
080:
081:                return cf;
082:            }
083:
084:            public ClassFab newClass(String name, Class super Class) {
085:                if (_log.isDebugEnabled())
086:                    _log.debug(String.format(
087:                            "Create ClassFab for %s (extends %s)", name,
088:                            super Class.getName()));
089:
090:                try {
091:                    CtClass ctNewClass = _classSource
092:                            .newClass(name, super Class);
093:
094:                    return new ClassFabImpl(_classSource, ctNewClass, _log);
095:                } catch (Exception ex) {
096:                    throw new RuntimeException(ServiceMessages
097:                            .unableToCreateClass(name, super Class, ex), ex);
098:                }
099:            }
100:
101:            public Class importClass(Class clazz) {
102:                return _pool.importClass(clazz);
103:            }
104:
105:            public int getCreatedClassCount() {
106:                return _classSource.getCreatedClassCount();
107:            }
108:
109:            public ClassLoader getClassLoader() {
110:                return _loader;
111:            }
112:
113:            public Location getMethodLocation(Method method) {
114:                notNull(method, "method");
115:
116:                // TODO: Is it worth caching this? Probably not as it usually is only
117:                // invoked perhaps at startup and in the event of errors.
118:
119:                Class declaringClass = method.getDeclaringClass();
120:                Class effectiveClass = importClass(declaringClass);
121:
122:                CtClass ctClass = _classSource.getCtClass(effectiveClass);
123:
124:                StringBuilder builder = new StringBuilder("(");
125:
126:                for (Class parameterType : method.getParameterTypes()) {
127:                    builder.append(ClassFabUtils.getTypeCode(parameterType));
128:                }
129:
130:                builder.append(")");
131:                builder.append(ClassFabUtils
132:                        .getTypeCode(method.getReturnType()));
133:
134:                try {
135:                    CtMethod ctMethod = ctClass.getMethod(method.getName(),
136:                            builder.toString());
137:
138:                    int lineNumber = ctMethod.getMethodInfo().getLineNumber(0);
139:
140:                    String sourceFile = ctMethod.getDeclaringClass()
141:                            .getClassFile2().getSourceFile();
142:
143:                    String description = String.format("%s (at %s:%d)",
144:                            InternalUtils.asString(method), sourceFile,
145:                            lineNumber);
146:
147:                    return new StringLocation(description, lineNumber);
148:                } catch (Exception ex) {
149:                    return new StringLocation(InternalUtils.asString(method), 0);
150:                }
151:            }
152:
153:            public Location getConstructorLocation(Constructor constructor) {
154:                notNull(constructor, "constructor");
155:
156:                StringBuilder builder = new StringBuilder();
157:
158:                Class declaringClass = constructor.getDeclaringClass();
159:
160:                builder.append(declaringClass.getName());
161:                builder.append("(");
162:
163:                CtClass ctClass = _classSource.getCtClass(declaringClass);
164:
165:                StringBuilder descripton = new StringBuilder("(");
166:
167:                Class[] parameterTypes = constructor.getParameterTypes();
168:                for (int i = 0; i < parameterTypes.length; i++) {
169:                    Class parameterType = parameterTypes[i];
170:
171:                    if (i > 0)
172:                        builder.append(", ");
173:
174:                    builder.append(parameterType.getSimpleName());
175:
176:                    descripton.append(ClassFabUtils.getTypeCode(parameterType));
177:                }
178:
179:                builder.append(")");
180:
181:                // A constructor resembles a method of type void
182:                descripton.append(")V");
183:
184:                int lineNumber = 0;
185:
186:                try {
187:                    CtConstructor ctConstructor = ctClass
188:                            .getConstructor(descripton.toString());
189:
190:                    lineNumber = ctConstructor.getMethodInfo().getLineNumber(0);
191:
192:                    String sourceFile = ctConstructor.getDeclaringClass()
193:                            .getClassFile2().getSourceFile();
194:
195:                    builder.append(String.format(" (at %s:%d)", sourceFile,
196:                            lineNumber));
197:                } catch (Exception ex) {
198:                }
199:
200:                return new StringLocation(builder.toString(), lineNumber);
201:            }
202:        }
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