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/*-
* ============LICENSE_START=======================================================
* ONAP - CCSDK
* ================================================================================
* Copyright (C) 2018 Huawei Technologies Co., Ltd. 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.
* ============LICENSE_END=========================================================
*/
package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
import org.onap.ccsdk.sli.core.sli.SvcLogicException;
import static java.lang.String.format;
import static org.onap.ccsdk.sli.plugins.yangserializers.dfserializer.DfSerializerUtil.FORMAT_ERR;
/**
* Represents the data format listener factory which will return JSON or XML
* listener according to the serializer helper.
*/
public final class DfListenerFactory {
/**
* Creates a new DfListenerFactory.
*/
private DfListenerFactory() {
}
/**
* Returns the instance of the data format listener factory.
*
* @return instance of the data format listener factory
*/
public static DfListenerFactory instance() {
return DfListenerFactory.LazyHolder.INSTANCE;
}
/**
* Bill pugh singleton pattern. Instance will not be instantiated until
* the lazy holder class is loaded via a call to the instance of method
* below.
*/
private static class LazyHolder {
private static final DfListenerFactory INSTANCE =
new DfListenerFactory();
}
/**
* Returns the data format listener by deciding it based on the format of
* the parameter.
*
* @param serHelper serializer helper
* @param params parameters
* @return data format listener
* @throws SvcLogicException when the data format type is wrong
*/
public Listener getListener(SerializerHelper serHelper,
YangParameters params)
throws SvcLogicException {
Listener listener;
switch (params.format) {
case JSON:
listener = new DefaultJsonListener(serHelper);
break;
case XML:
listener = new DefaultXmlListener(serHelper);
break;
default:
throw new SvcLogicException(format(FORMAT_ERR,
params.format));
}
return listener;
}
}
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