org.onosproject.yang.runtime.impl.YobHandlerFactory Maven / Gradle / Ivy
/*
* Copyright 2017-present Open Networking 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.onosproject.yang.runtime.impl;
import org.onosproject.yang.model.DataNode;
import org.onosproject.yang.model.ModelConverterException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.HashMap;
import java.util.Map;
import static org.onosproject.yang.model.DataNode.Type.MULTI_INSTANCE_LEAF_VALUE_NODE;
import static org.onosproject.yang.model.DataNode.Type.MULTI_INSTANCE_NODE;
import static org.onosproject.yang.model.DataNode.Type.SINGLE_INSTANCE_LEAF_VALUE_NODE;
import static org.onosproject.yang.model.DataNode.Type.SINGLE_INSTANCE_NODE;
import static org.onosproject.yang.runtime.impl.YobConstants.E_DATA_NODE_TYPE_IS_NOT_SUPPORT;
/**
* Represents an YANG object builder factory to create different types
* of YANG data tree node.
*/
final class YobHandlerFactory {
private static final Logger log =
LoggerFactory.getLogger(YobHandlerFactory.class);
/**
* Map of YANG object builder handler.
*/
private static final Map HANDLER_MAP = new
HashMap<>();
/**
* Creates instance of YobHandlerFactory.
*/
private YobHandlerFactory() {
HANDLER_MAP.put(SINGLE_INSTANCE_NODE, new YobInnerNodeHandler());
HANDLER_MAP.put(MULTI_INSTANCE_NODE, new YobInnerNodeHandler());
HANDLER_MAP.put(SINGLE_INSTANCE_LEAF_VALUE_NODE,
new YobLeafNodeHandler());
HANDLER_MAP.put(MULTI_INSTANCE_LEAF_VALUE_NODE,
new YobLeafListNodeHandler());
}
/**
* Returns the corresponding YOB handler for current context.
*
* @param type data node type
* @return handler to create the object
* @throws ModelConverterException if the data node type is not supported in YOB
*/
YobHandler getYobHandlerForContext(DataNode.Type type) {
YobHandler yobHandler = HANDLER_MAP.get(type);
if (yobHandler == null) {
log.error(E_DATA_NODE_TYPE_IS_NOT_SUPPORT);
throw new ModelConverterException(E_DATA_NODE_TYPE_IS_NOT_SUPPORT);
}
return yobHandler;
}
/**
* Returns the YANG object builder factory instance.
*
* @return YANG object builder factory instance
*/
static YobHandlerFactory instance() {
return LazyHolder.INSTANCE;
}
/*
* Bill Pugh Singleton pattern. INSTANCE won't be instantiated until the
* LazyHolder class is loaded via a call to the instance() method below.
*/
static class LazyHolder {
private static final YobHandlerFactory INSTANCE =
new YobHandlerFactory();
}
}