// Copyright 2007 The Apache Software Foundation
//
// 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.apache.hivemind.annotations.internal;
import java.lang.reflect.Method;
import org.apache.hivemind.ApplicationRuntimeException;
import org.apache.hivemind.Location;
import org.apache.hivemind.definition.Contribution;
import org.apache.hivemind.definition.ContributionContext;
/**
* Contributes to a configuration point by passing the configuration container
* to a method defined in an annotated module by use of the {@link Contribution} annotation.
*
* @author Achim Huegen
*/
public class MethodCallContributionConstructor implements
Contribution
{
private Method _templateMethod;
private ModuleInstanceProvider _moduleInstanceProvider;
private Location _location;
public MethodCallContributionConstructor(Location location, Method factoryMethod,
ModuleInstanceProvider moduleInstanceProvider)
{
_location = location;
_templateMethod = factoryMethod;
_moduleInstanceProvider = moduleInstanceProvider;
}
public Location getLocation()
{
return _location;
}
public void contribute(ContributionContext context)
{
try
{
if (_templateMethod.getParameterTypes().length == 0) {
Object result = _templateMethod.invoke(_moduleInstanceProvider.getModuleInstance());
// a null contribution means: nothing to contribute. This happens for example
// in configuration point definitions
if (result != null) {
context.mergeContribution(result);
}
} else if (_templateMethod.getParameterTypes().length == 1) {
Object[] params = new Object[] {context.getConfigurationData()};
_templateMethod.invoke(_moduleInstanceProvider.getModuleInstance(), params);
} else {
// TODO: Throw Exception
}
}
catch (Exception ex)
{
throw new ApplicationRuntimeException(ex.getMessage(), getLocation(), ex);
}
}
}