org.eclipse.jetty.plus.annotation.LifeCycleCallback Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.plus.annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.eclipse.jetty.util.IntrospectionUtil;
import org.eclipse.jetty.util.Loader;
/**
* LifeCycleCallback
*
*
*/
public abstract class LifeCycleCallback
{
public static final Object[] __EMPTY_ARGS = new Object[] {};
private Method _target;
private Class> _targetClass;
private String _className;
private String _methodName;
public LifeCycleCallback()
{
}
/**
* @return the _targetClass
*/
public Class> getTargetClass()
{
return _targetClass;
}
public String getTargetClassName()
{
return _className;
}
public String getMethodName()
{
return _methodName;
}
/**
* @return the target
*/
public Method getTarget()
{
return _target;
}
public void setTarget (String className, String methodName)
{
_className = className;
_methodName = methodName;
}
public void setTarget (Class> clazz, String methodName)
{
try
{
Method method = IntrospectionUtil.findMethod(clazz, methodName, null, true, true);
validate(clazz, method);
_target = method;
_targetClass = clazz;
_className = clazz.getCanonicalName();
_methodName = methodName;
}
catch (NoSuchMethodException e)
{
throw new IllegalArgumentException ("Method "+methodName+" not found on class "+clazz.getName());
}
}
public void callback (Object instance)
throws SecurityException, NoSuchMethodException, ClassNotFoundException, IllegalArgumentException, IllegalAccessException, InvocationTargetException
{
if (_target == null)
{
if (_targetClass == null)
_targetClass = Loader.loadClass(null, _className);
_target = _targetClass.getDeclaredMethod(_methodName, new Class[]{}); //TODO
}
if (_target != null)
{
boolean accessibility = getTarget().isAccessible();
getTarget().setAccessible(true);
getTarget().invoke(instance, __EMPTY_ARGS);
getTarget().setAccessible(accessibility);
}
}
/**
* Find a method of the given name either directly in the given
* class, or inherited.
*
* @param pack the package of the class under inspection
* @param clazz the class under inspection
* @param methodName the method to find
* @param checkInheritance false on first entry, true if a superclass is being introspected
* @return the method
*/
public Method findMethod (Package pack, Class> clazz, String methodName, boolean checkInheritance)
{
if (clazz == null)
return null;
try
{
Method method = clazz.getDeclaredMethod(methodName, null);
if (checkInheritance)
{
int modifiers = method.getModifiers();
if (Modifier.isProtected(modifiers) || Modifier.isPublic(modifiers) || (!Modifier.isPrivate(modifiers)&&(pack.equals(clazz.getPackage()))))
return method;
else
return findMethod(clazz.getPackage(), clazz.getSuperclass(), methodName, true);
}
return method;
}
catch (NoSuchMethodException e)
{
return findMethod(clazz.getPackage(), clazz.getSuperclass(), methodName, true);
}
}
public boolean equals (Object o)
{
if (o==null)
return false;
if (!(o instanceof LifeCycleCallback))
return false;
LifeCycleCallback callback = (LifeCycleCallback)o;
if (callback.getTargetClass()==null)
{
if (getTargetClass() != null)
return false;
}
else if(!callback.getTargetClass().equals(getTargetClass()))
return false;
if (callback.getTarget()==null)
{
if (getTarget() != null)
return false;
}
else if (!callback.getTarget().equals(getTarget()))
return false;
return true;
}
public abstract void validate (Class> clazz, Method m);
}
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