org.eclipse.jetty.plus.annotation.Injection Maven / Gradle / Ivy
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// Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
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// 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.
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//
package org.eclipse.jetty.plus.annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.Locale;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import org.eclipse.jetty.util.IntrospectionUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* Injection
*
* Represents the injection of a resource into a target (method or field).
* The injection is performed by doing an ENC lookup using the jndi
* name provided, and setting the object obtained on the target.
*
*/
public class Injection
{
private static final Logger LOG = Log.getLogger(Injection.class);
private Class> _targetClass;
private String _jndiName;
private String _mappingName;
private Member _target;
private Class> _paramClass;
private Class> _resourceClass;
public Injection ()
{
}
/**
* @return the _className
*/
public Class> getTargetClass()
{
return _targetClass;
}
public Class> getParamClass ()
{
return _paramClass;
}
public Class> getResourceClass ()
{
return _resourceClass;
}
public boolean isField ()
{
return (_target != null && _target instanceof Field);
}
public boolean isMethod ()
{
return (_target != null && _target instanceof Method);
}
/**
* @return the jndiName
*/
public String getJndiName()
{
return _jndiName;
}
/**
* @param jndiName the jndiName to set
*/
public void setJndiName(String jndiName)
{
this._jndiName = jndiName;
}
/**
* @return the mappingName
*/
public String getMappingName()
{
return _mappingName;
}
/**
* @param mappingName the mappingName to set
*/
public void setMappingName(String mappingName)
{
this._mappingName = mappingName;
}
/**
* @return the target
*/
public Member getTarget()
{
return _target;
}
public void setTarget(Class> clazz, Field field, Class> resourceType)
{
_targetClass = clazz;
_target = field;
_resourceClass = resourceType;
}
public void setTarget(Class> clazz, Method method, Class> arg, Class> resourceType)
{
_targetClass = clazz;
_target = method;
_resourceClass = resourceType;
_paramClass = arg;
}
public void setTarget (Class> clazz, String target, Class> resourceType)
{
_targetClass = clazz;
_resourceClass = resourceType;
//first look for a javabeans style setter matching the targetName
String setter = "set"+target.substring(0,1).toUpperCase(Locale.ENGLISH)+target.substring(1);
try
{
LOG.debug("Looking for method for setter: "+setter+" with arg "+_resourceClass);
_target = IntrospectionUtil.findMethod(clazz, setter, new Class[] {_resourceClass}, true, false);
_targetClass = clazz;
_paramClass = _resourceClass;
}
catch (NoSuchMethodException me)
{
//try as a field
try
{
_target = IntrospectionUtil.findField(clazz, target, resourceType, true, false);
_targetClass = clazz;
}
catch (NoSuchFieldException fe)
{
throw new IllegalArgumentException("No such field or method "+target+" on class "+_targetClass);
}
}
}
/**
* Inject a value for a Resource from JNDI into an object
* @param injectable
*/
public void inject (Object injectable)
{
if (_target != null)
{
if (_target instanceof Field)
injectField((Field)_target, injectable);
else
injectMethod((Method)_target, injectable);
}
else
throw new IllegalStateException ("No method or field to inject with "+getJndiName());
}
/**
* The Resource must already exist in the ENC of this webapp.
* @return the injected valud
* @throws NamingException
*/
public Object lookupInjectedValue ()
throws NamingException
{
InitialContext context = new InitialContext();
return context.lookup("java:comp/env/"+getJndiName());
}
/**
* Inject value from jndi into a field of an instance
* @param field
* @param injectable
*/
protected void injectField (Field field, Object injectable)
{
try
{
boolean accessibility = field.isAccessible();
field.setAccessible(true);
field.set(injectable, lookupInjectedValue());
field.setAccessible(accessibility);
}
catch (Exception e)
{
LOG.warn(e);
throw new IllegalStateException("Inject failed for field "+field.getName());
}
}
/**
* Inject value from jndi into a setter method of an instance
* @param method
* @param injectable
*/
protected void injectMethod (Method method, Object injectable)
{
try
{
boolean accessibility = method.isAccessible();
method.setAccessible(true);
method.invoke(injectable, new Object[] {lookupInjectedValue()});
method.setAccessible(accessibility);
}
catch (Exception e)
{
LOG.warn(e);
throw new IllegalStateException("Inject failed for method "+method.getName());
}
}
}
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