/*
* Copyright 2007 Tim Peierls
*
* Licensed 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.directwebremoting.guice;
import com.google.inject.Injector;
import org.directwebremoting.extend.Creator;
import org.directwebremoting.create.NewCreator;
import static org.directwebremoting.guice.DwrGuiceUtil.getInjector;
/**
* A creator that uses Guice dependency injection to create remoted objects.
* @author Tim Peierls [tim at peierls dot net]
*/
public class GuiceCreator extends NewCreator implements Creator
{
public GuiceCreator()
{
this.injector = getInjector();
}
/**
* Specified via {@link org.directwebremoting.annotations.RemoteProxy @RemoteProxy}
* or via a parameter in XML configuration.
*/
@Override
public void setClass(String classname)
{
try
{
// Don't use LocalUtil.classForName because it insists
// on a default constructor, and we want to be able to
// use an @Inject constructor.
this.type = Class.forName(classname);
}
catch (ClassNotFoundException ex)
{
throw new IllegalArgumentException(String.format("GuiceCreator: class %s not found", classname));
}
}
/**
* The class named through {@link GuiceCreator#setClass setClass}.
*/
@Override
public Class<?> getType()
{
return type;
}
/**
* Looks up an instance of this creator's type with an
* {@link com.google.inject.Injector Injector}.
*/
@Override
public Object getInstance()
{
return injector.getInstance(type);
}
/**
* The type of object being created.
*/
private volatile Class<?> type;
/**
* The Injector with which objects are created.
*/
private final Injector injector;
}