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/*
* Copyright © 2016-2017 European Support Limited
*
* 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.openecomp.sdcrests.mapping;
import org.openecomp.sdc.common.errors.CoreException;
import org.openecomp.sdc.common.errors.ErrorCode;
/**
* Base class for all mapping classes. Mapping classes will perform data mapping from source object to target object Base class provides
* following<br>
* <ol> <li>provides life cycle of mapping class , first mapSimpleProperties is called and then mapComplexProperties is called.</li> <li>methods
* mapSimpleProperties and mapComplexProperties with default implementation, these should be overridden by concrete mapping classes for writing
* mapping logic.</li> </ol>
*/
public abstract class MappingBase<S, T> {
/**
* Method is called for starting mapping from source object to target object method sets context in the thread locale and than calls
* mapSimpleProperties and mapComplexProperties respectively.
*
* @param source : source object for mapping
* @param clazz : target <code>Class</code> for mapping
* @return <code>T</code> - instance of type <code>T</code>
*/
public final T applyMapping(final S source, Class<T> clazz) {
T target = (T) instantiateTarget(clazz);
if (source != null) {
preMapping(source, target);
doMapping(source, target);
postMapping(source, target);
}
return target;
}
/**
* This method is called before the <code>doMapping</code> method.
*/
public void preMapping(final S source, T target) {
// extension point
}
/**
* The actual method that does the mapping between the <code>source</code> to <code>target</code> objects. This method is being called
* automatically as part of the mapper class. This method must be override (it is abstract) by the mapper class.
*
* @param source - the source object.
* @param target - the target object.
*/
public abstract void doMapping(final S source, T target);
/**
* This method is called after the <code>doMapping</code> method.
*/
public void postMapping(final S source, T target) {
// extension point
}
/**
* Creates the instance of the input class.
*
* @return <code>Object</code>
*/
private Object instantiateTarget(final Class<?> clazz) {
try {
return clazz.newInstance();
} catch (InstantiationException | IllegalAccessException exception) {
throw new CoreException((new ErrorCode.ErrorCodeBuilder()).withMessage(exception.getMessage()).build(), exception);
}
}
}
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