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benerator is a framework for creating realistic and valid high-volume test data, used for testing (unit/integration/load) and showcase setup. Metadata constraints are imported from systems and/or configuration files. Data can imported from and exported to files and systems, anonymized or generated from scratch. Domain packages provide reusable generators for creating domain-specific data as names and addresses internationalizable in language and region. It is strongly customizable with plugins and configuration options.

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/*
 * (c) Copyright 2007-2014 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License.
 *
 * For redistributing this software or a derivative work under a license other
 * than the GPL-compatible Free Software License as defined by the Free
 * Software Foundation or approved by OSI, you must first obtain a commercial
 * license to this software product from Volker Bergmann.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package org.databene.platform.java;

import org.databene.model.data.Entity;
import org.databene.commons.BeanUtil;
import org.databene.commons.converter.ThreadSafeConverter;
import org.databene.commons.mutator.AnyMutator;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.util.Collection;
import java.util.Map;

/**
 * Converts entities and entity arrays to Java beans and bean arrays.

 * 

 * Created: 29.08.2007 08:50:24
 * @author Volker Bergmann
 */
public class Entity2JavaConverter extends ThreadSafeConverter {
	
    public Entity2JavaConverter() {
        super(Object.class, Object.class);
    }
    
    @Override
	public Object convert(Object entityOrArray) {
    	return convertAny(entityOrArray);
    }

    public static Object convertAny(Object entityOrArray) {
		if (entityOrArray == null)
    		return null;
    	else if (entityOrArray instanceof Entity)
    		return convertEntity((Entity) entityOrArray, BeanUtil.forName(((Entity) entityOrArray).type()));
    	else if (entityOrArray.getClass().isArray())
    		return convertArray((Object[]) entityOrArray);
    	else
    		return entityOrArray;
	}
    
    public static Object convertAny(Object entityOrArray, Class targetType) {
		if (entityOrArray == null)
    		return null;
    	else if (entityOrArray instanceof Entity)
    		return convertEntity((Entity) entityOrArray, targetType);
    	else if (entityOrArray.getClass().isArray())
    		return convertArray((Object[]) entityOrArray, targetType);
    	else
    		return entityOrArray;
	}
    
	private static Object convertArray(Object[] array, Class targetType) {
		Object result = Array.newInstance(targetType, array.length);
		for (int i = 0; i < array.length; i++) {
			Object value = convertAny(array[i], targetType);
			Array.set(result, i, value);
		}
		return result;
	}
	
	private static Object convertArray(Object[] array) {
		Object[] result = new Object[array.length];
		for (int i = 0; i < array.length; i++)
			result[i] = convertAny(array[i]);
		return result;
	}
	
	private static Object convertEntity(Entity entity, Class targetBeanType) {
		Object result = BeanUtil.newInstance(targetBeanType);
        for (Map.Entry entry : entity.getComponents().entrySet()) {
            String featureName = entry.getKey();
			Class targetComponentType = typeOrComponentTypeOf(featureName, targetBeanType);
            if (targetComponentType != null) { // if the target object does not contain a feature of the given name, ignore the entry
				Object value = convertAny(entry.getValue(), targetComponentType);
				AnyMutator.setValue(result, featureName, value, false, true);
            }
        }
        return result;
	}

	private static Class typeOrComponentTypeOf(String featureName, Class beanClass) {
		Class propertyType = null;
		PropertyDescriptor propertyDescriptor = BeanUtil.getPropertyDescriptor(beanClass, featureName);
		if (propertyDescriptor != null) {
			propertyType = propertyDescriptor.getPropertyType();
		} else {
			try {
				Field field = BeanUtil.getField(beanClass, featureName);
				propertyType = field.getType();
			} catch (Exception e) {
				return null;
			}
		}
		if (propertyType.isArray())
			return propertyType.getComponentType();
		else if (Collection.class.isAssignableFrom(propertyType))
			return getCollectionType(propertyDescriptor);
		else
			return propertyType;
	}

	private static Class getCollectionType(PropertyDescriptor propertyDescriptor) {
		ParameterizedType genericReturnType = (ParameterizedType) propertyDescriptor.getReadMethod().getGenericReturnType();
		return (Class) genericReturnType.getActualTypeArguments()[0];
	}

}