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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
* Modifications Copyright (C) 2019-2020 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.models.provider;
import javax.ws.rs.core.Response;
import lombok.NonNull;
import org.onap.policy.models.base.PfModelException;
import org.onap.policy.models.dao.impl.ProxyDao;
/**
* A factory for creating PolicyModelsProvider objects using the default Policy Framework implementation.
*
* @author Liam Fallon (liam.fallon@est.tech)
*/
public class PolicyModelsProviderFactory {
/**
* Create PolicyModelsProvider.
*
* @param pfDao the ProxyDao
* @param parameters the PolicyModelsProviderParameters
* @return the PolicyModelsProvider
* @throws PfModelException on errors creating an implementation of the PolicyModelProvider
*/
public PolicyModelsProvider createPolicyModelsProvider(@NonNull final ProxyDao pfDao,
@NonNull final PolicyModelsProviderParameters parameters) throws PfModelException {
// Get the class for the PolicyModelsProvider
Class<?> implementationClass = null;
try {
// Check if the implementation class is on the classpath
implementationClass = Class.forName(parameters.getImplementation());
} catch (final Exception exc) {
String errorMessage = "could not find implementation of the \"PolicyModelsProvider\" interface \""
+ parameters.getImplementation() + "\"";
throw new PfModelException(Response.Status.NOT_FOUND, errorMessage, exc);
}
// It is, now check if it is a PolicyModelsProvider
if (!PolicyModelsProvider.class.isAssignableFrom(implementationClass)) {
String errorMessage = "the class \"" + implementationClass.getName()
+ "\" is not an implementation of the \"PolicyModelsProvider\" interface";
throw new PfModelException(Response.Status.BAD_REQUEST, errorMessage);
}
try {
return (PolicyModelsProvider) implementationClass.getConstructor(ProxyDao.class).newInstance(pfDao);
} catch (Exception exc) {
String errorMessage =
"could not create an instance of PolicyModelsProvider \"" + parameters.getImplementation() + "\"";
throw new PfModelException(Response.Status.INTERNAL_SERVER_ERROR, errorMessage, exc);
}
}
/**
* Creates a new PolicyModelsProvider object from its implementation.
*
* @param parameters The parameters for the implementation of the PolicyModelProvider
* @throws PfModelException on errors creating an implementation of the PolicyModelProvider
*/
public PolicyModelsProvider createPolicyModelsProvider(@NonNull final PolicyModelsProviderParameters parameters)
throws PfModelException {
// Get the class for the PolicyModelsProvider
Class<?> implementationClass = null;
try {
// Check if the implementation class is on the classpath
implementationClass = Class.forName(parameters.getImplementation());
} catch (final Exception exc) {
String errorMessage = "could not find implementation of the \"PolicyModelsProvider\" interface \""
+ parameters.getImplementation() + "\"";
throw new PfModelException(Response.Status.NOT_FOUND, errorMessage, exc);
}
// It is, now check if it is a PolicyModelsProvider
if (!PolicyModelsProvider.class.isAssignableFrom(implementationClass)) {
String errorMessage = "the class \"" + implementationClass.getName()
+ "\" is not an implementation of the \"PolicyModelsProvider\" interface";
throw new PfModelException(Response.Status.BAD_REQUEST, errorMessage);
}
try {
PolicyModelsProvider provider = (PolicyModelsProvider) implementationClass
.getConstructor(PolicyModelsProviderParameters.class).newInstance(parameters);
provider.init();
return provider;
} catch (Exception exc) {
String errorMessage =
"could not create an instance of PolicyModelsProvider \"" + parameters.getImplementation() + "\"";
throw new PfModelException(Response.Status.INTERNAL_SERVER_ERROR, errorMessage, exc);
}
}
}
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