| package org.apache.felix.dm.impl.dependencies; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| |
| import org.apache.felix.dm.dependencies.Dependency; |
| import org.apache.felix.dm.impl.Logger; |
| |
| public abstract class AbstractDependency implements Dependency, DependencyActivation { |
| private boolean m_isRequired; |
| protected final Logger m_logger; |
| |
| public AbstractDependency(Logger logger) { |
| m_logger = logger; |
| } |
| |
| public synchronized boolean isRequired() { |
| return m_isRequired; |
| } |
| |
| protected synchronized void setIsRequired(boolean isRequired) { |
| m_isRequired = isRequired; |
| } |
| |
| protected void invokeCallbackMethod(Object[] instances, String methodName, Class[][] signatures, Object[][] parameters) { |
| for (int i = 0; i < instances.length; i++) { |
| try { |
| invokeCallbackMethod(instances[i], methodName, signatures, parameters); |
| } |
| catch (NoSuchMethodException e) { |
| m_logger.log(Logger.LOG_DEBUG, "Method '" + methodName + "' does not exist on " + instances[i] + ". Callback skipped."); |
| } |
| } |
| } |
| |
| protected void invokeCallbackMethod(Object instance, String methodName, Class[][] signatures, Object[][] parameters) throws NoSuchMethodException { |
| Class currentClazz = instance.getClass(); |
| boolean done = false; |
| while (!done && currentClazz != null) { |
| done = invokeMethod(instance, currentClazz, methodName, signatures, parameters, false); |
| if (!done) { |
| currentClazz = currentClazz.getSuperclass(); |
| } |
| } |
| if (!done && currentClazz == null) { |
| throw new NoSuchMethodException(methodName); |
| } |
| } |
| |
| protected boolean invokeMethod(Object object, Class clazz, String name, Class[][] signatures, Object[][] parameters, boolean isSuper) { |
| Method m = null; |
| for (int i = 0; i < signatures.length; i++) { |
| Class[] signature = signatures[i]; |
| try { |
| m = clazz.getDeclaredMethod(name, signature); |
| if (!(isSuper && Modifier.isPrivate(m.getModifiers()))) { |
| m.setAccessible(true); |
| try { |
| m.invoke(object, parameters[i]); |
| } |
| catch (InvocationTargetException e) { |
| m_logger.log(Logger.LOG_ERROR, "Exception while invoking method " + m + ".", e); |
| } |
| // we did find and invoke the method, so we return true |
| return true; |
| } |
| } |
| catch (NoSuchMethodException e) { |
| // ignore this and keep looking |
| } |
| catch (Exception e) { |
| // could not even try to invoke the method |
| m_logger.log(Logger.LOG_ERROR, "Exception while trying to invoke method " + m + ".", e); |
| } |
| } |
| return false; |
| } |
| } |