/*
* Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors.
*
* 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.switchyard.component.bpm.util;
import java.lang.reflect.Constructor;
import java.util.Properties;
// SWITCHYARD-1755: internal api usage still required (public APIs insufficient)
import org.kie.internal.task.api.UserGroupCallback;
import org.switchyard.common.type.reflect.Construction;
import org.switchyard.component.bpm.BPMMessages;
import org.switchyard.component.bpm.config.model.BPMComponentImplementationModel;
import org.switchyard.component.bpm.config.model.UserGroupCallbackModel;
import org.switchyard.component.bpm.runtime.BPMUserGroupCallback;
import org.switchyard.config.model.property.PropertiesModel;
/**
* UserGroupCallback functions.
*
* @author David Ward <<a href="mailto:dward@jboss.org">dward@jboss.org</a>> © 2013 Red Hat Inc.
*/
public final class UserGroupCallbacks {
private static final Class<?>[][] PARAMETER_TYPES = new Class<?>[][]{
new Class<?>[]{Properties.class},
new Class<?>[0]
};
/**
* Creates a new user group callback.
* @param model the model
* @param loader the loader
* @return the user group callback
*/
@SuppressWarnings("unchecked")
public static UserGroupCallback newUserGroupCallback(BPMComponentImplementationModel model, ClassLoader loader) {
Class<? extends UserGroupCallback> userGroupCallbackClass = null;
Properties properties = null;
UserGroupCallbackModel userGroupCallbackModel = model.getUserGroupCallback();
if (userGroupCallbackModel != null) {
userGroupCallbackClass = (Class<? extends UserGroupCallback>)userGroupCallbackModel.getClazz(loader);
PropertiesModel propertiesModel = userGroupCallbackModel.getProperties();
properties = propertiesModel != null ? propertiesModel.toProperties() : null;
}
if (properties == null) {
properties = new Properties();
}
if (userGroupCallbackClass != null) {
return newUserGroupCallback(userGroupCallbackClass, properties);
} else if (properties.size() > 0) {
return new BPMUserGroupCallback(properties);
} else {
return new BPMUserGroupCallback();
}
}
/**
* Creates a new user group callback.
* @param userGroupCallbackClass the class
* @param properties the properties
* @return the user group callback
*/
public static UserGroupCallback newUserGroupCallback(Class<? extends UserGroupCallback> userGroupCallbackClass, Properties properties) {
UserGroupCallback userGroupCallback = null;
Constructor<? extends UserGroupCallback> constructor = getConstructor(userGroupCallbackClass);
Class<?>[] parameterTypes = constructor != null ? constructor.getParameterTypes() : new Class<?>[0];
try {
if (parameterTypes.length == 0) {
userGroupCallback = Construction.construct(userGroupCallbackClass);
} else if (parameterTypes.length == 1) {
userGroupCallback = Construction.construct(userGroupCallbackClass, parameterTypes, new Object[]{properties});
}
} catch (Throwable t) {
throw BPMMessages.MESSAGES.couldNotInstantiateUserGroupCallbackClass(userGroupCallbackClass.getName());
}
return userGroupCallback;
}
private static Constructor<? extends UserGroupCallback> getConstructor(Class<? extends UserGroupCallback> userGroupCallbackClass) {
Constructor<? extends UserGroupCallback> constructor = null;
for (Class<?>[] parameterTypes : PARAMETER_TYPES) {
try {
constructor = userGroupCallbackClass.getConstructor(parameterTypes);
if (constructor != null) {
break;
}
} catch (Throwable t) {
// keep checkstyle happy ("at least one statement")
t.getMessage();
}
}
return constructor;
}
private UserGroupCallbacks() {}
}