diff options
Diffstat (limited to 'sca-java-1.x/tags/1.6/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/util/JavaReflectionAdapter.java')
-rw-r--r-- | sca-java-1.x/tags/1.6/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/util/JavaReflectionAdapter.java | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/1.6/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/util/JavaReflectionAdapter.java b/sca-java-1.x/tags/1.6/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/util/JavaReflectionAdapter.java new file mode 100644 index 0000000000..5e7d6761d9 --- /dev/null +++ b/sca-java-1.x/tags/1.6/modules/binding-ejb-runtime/src/main/java/org/apache/tuscany/sca/binding/ejb/util/JavaReflectionAdapter.java @@ -0,0 +1,157 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +package org.apache.tuscany.sca.binding.ejb.util; + +import java.beans.PropertyDescriptor; +import java.lang.reflect.InvocationTargetException; +import java.lang.reflect.Method; +import java.security.AccessController; +import java.security.PrivilegedAction; +import java.util.Collections; +import java.util.HashMap; +import java.util.Map; +import java.util.WeakHashMap; + +import org.osoa.sca.ServiceRuntimeException; + +/** + * An adapter for java classes, indexes the methods by name and provides an + * invoke method that takes a method name. + * + * @version $Rev$ $Date$ + */ +final class JavaReflectionAdapter { + + private static Map<Class, JavaReflectionAdapter> adapters = + Collections.synchronizedMap(new WeakHashMap<Class, JavaReflectionAdapter>()); + + private static final Map<Class, Object> DEFAULT_VALUES = new HashMap<Class, Object>(); + static { + DEFAULT_VALUES.put(boolean.class, Boolean.FALSE); + DEFAULT_VALUES.put(byte.class, new Byte((byte)0)); + DEFAULT_VALUES.put(char.class, new Character((char)0)); + DEFAULT_VALUES.put(short.class, new Short((short)0)); + DEFAULT_VALUES.put(int.class, Integer.valueOf(0)); + DEFAULT_VALUES.put(long.class, new Long(0)); + DEFAULT_VALUES.put(float.class, new Float(0.0)); + DEFAULT_VALUES.put(double.class, new Double(0.0)); + } + + private Map<String, Method> methodMap = new HashMap<String, Method>(); + + /** + * Constructor + * + * @param clazz + */ + private JavaReflectionAdapter(final Class clazz) { + // Index the methods on the implementation class + // FIXME J2 Security - promote this to callers of this method + Method[] methods = AccessController.doPrivileged(new PrivilegedAction<Method[]>() { + public Method[] run() { + return clazz.getMethods(); + } + }); + for (int i = 0; i < methods.length; i++) { + methodMap.put(methods[i].getName(), methods[i]); + } + } + + /** + * Create a java reflection adapter + * + * @param clazz + */ + static synchronized JavaReflectionAdapter createJavaReflectionAdapter(Class clazz) { + JavaReflectionAdapter adapter = (JavaReflectionAdapter)adapters.get(clazz); + if (adapter == null) { + adapter = new JavaReflectionAdapter(clazz); + adapters.put(clazz, adapter); + } + return adapter; + } + + /** + * Return the specified method + * + * @param methodName + * @return + * @throws NoSuchMethodException + */ + Method getMethod(String methodName) throws NoSuchMethodException { + + Method method = (Method)methodMap.get(methodName); + if (method == null) { + throw new NoSuchMethodException(methodName); + } + return method; + } + + /** + * Returns a map containing the methods on the class, keyed by name + * + * @return + */ + Map getMethods() { + return methodMap; + } + + /** + * Invoke a method using Java reflection. + * + * @param method + * @param object + * @param args + * @return + * @throws InvocationTargetException + * @throws IllegalAccessException + */ + Object invoke(Method method, Object object, Object[] args) throws InvocationTargetException, + IllegalAccessException { + Class[] parameterTypes = method.getParameterTypes(); + for (int i = 0; i < parameterTypes.length; i++) { + Class parameterType = parameterTypes[i]; + if (args[i] == null && parameterType.isPrimitive()) { + args[i] = DEFAULT_VALUES.get(parameterType); + } + } + return method.invoke(object, args); + } + + /** + * Set the java bean property + * + * @param bean + * @param propertyName + * @param value + * @return + */ + boolean setProperty(Object bean, String propertyName, Object value) { + try { + PropertyDescriptor propertyDescriptor = new PropertyDescriptor(propertyName, bean.getClass()); + Method writeMethod = propertyDescriptor.getWriteMethod(); + writeMethod.invoke(bean, new Object[] {value}); + return true; + } catch (InvocationTargetException e) { + throw new ServiceRuntimeException(e.getTargetException()); + } catch (Exception e) { + return false; + } + } +} |