EDIT

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.io.common.mapping.out;

import java.lang.reflect.Method;

import java.sql.PreparedStatement;

import java.util.ArrayList;

import java.util.HashSet;

import java.util.List;

import java.util.Set;

import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;

import eu.etaxonomy.cdm.io.common.DbExportStateBase;

import eu.etaxonomy.cdm.io.common.mapping.CdmAttributeMapperBase;

import eu.etaxonomy.cdm.model.common.CdmBase;

/**

 * Changes the object to be handled (usually the object to be mapped stays the same for all mappers of a mapping).

 * @author a.mueller

 * @since 12.05.2009

 */

public class ObjectChangeMapper extends CdmAttributeMapperBase implements IDbExportMapper<DbExportStateBase<?, IExportTransformer>, IExportTransformer> {

	private static final Logger logger = LogManager.getLogger(ObjectChangeMapper.class);

	private DbExportStateBase<?, IExportTransformer> state;  //for possible later use

	private Class<? extends CdmBase> oldClass;

	private Class<? extends CdmBase> newClass;

	private String cdmAttribute;

	private Method method;

//	private Class<?>[] parameterTypes;

	public static ObjectChangeMapper NewInstance(Class<? extends CdmBase>  oldClass, Class<? extends CdmBase> newClass, String cdmAttribute){

		String methodName = "get" + cdmAttribute;

		return new ObjectChangeMapper(oldClass, newClass, methodName, (Class<?>[])null);

	}

	protected ObjectChangeMapper(Class<? extends CdmBase>oldClazz,Class<? extends CdmBase>newClazz, String methodName, Class<?>... parameterTypes) {

		try {

//			this.parameterTypes = parameterTypes;

			oldClass = oldClazz;

			newClass = newClazz;

			method = oldClazz.getDeclaredMethod(methodName, parameterTypes);

			method.setAccessible(true);

		} catch (SecurityException e) {

			logger.error("SecurityException", e);

		} catch (NoSuchMethodException e) {

			logger.error("NoSuchMethodException", e);

		}

	}

	@Override

	public void initialize(PreparedStatement stmt, IndexCounter index, DbExportStateBase<?, IExportTransformer> state, String tableName) {

		this.state = state;

	}

	@Override

    public boolean invoke(CdmBase cdmBase) {

		throw new RuntimeException("Invoke must not be called for " + this.getClass().getSimpleName() + ".  Return type is still incompatible. Use getNewObject instead.");

	}

	public CdmBase getNewObject(CdmBase oldCdmBase){

		try {

			if (oldCdmBase.isInstanceOf(oldClass)){

				return  (CdmBase)method.invoke(oldCdmBase, (Object[])null);

			}else if (oldCdmBase.isInstanceOf(newClass)){

				return oldCdmBase;

			}else{

				logger.warn("ObjectChangeMapper "+this.toString()+"not applicable for CdmBase " + oldCdmBase.getClass());

				return oldCdmBase;

			}

		} catch (Exception e) {

			throw new RuntimeException(e);

		}

	}

	@Override

	public Set<String> getSourceAttributes() {

		Set<String> result = new HashSet<>();

		if (cdmAttribute != null){

			result.add(cdmAttribute);

		}

		return result;

	}

	@Override

	public Set<String> getDestinationAttributes() {

		return new HashSet<>();

	}

	@Override

	public List<String> getSourceAttributeList() {

		ArrayList<String> result = new ArrayList<>();

		if (cdmAttribute != null){

			result.add(cdmAttribute);

		}

		return result;

	}

	@Override

	public List<String> getDestinationAttributeList() {

		return new ArrayList<>();

	}

}