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Nomin is a mapping engine for the Java platform. It provides abilities to transform object trees according to declarative mapping rules. Main features of Nomin are no XML configuration, intuitively looking mapping, using arbitrary expressions and method invocations in mappings, pre and postprocessing right in a mapping listing, customizations. It's applicable for any Java compatible classes, not only JavaBeans.

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package org.nomin.core.preprocessing;

import org.apache.commons.beanutils.ConvertUtils;
import org.nomin.NominMapper;
import org.nomin.core.*;
import org.nomin.util.TypeInfo;

/**
 * Chooses and applies appropriate preprocessing depending on a value.
 * @author Dmitry Dobrynin
 *         Created: 12.05.2010 23:40:05
 */
public class DynamicPreprocessing extends Preprocessing {
    private TypeInfo typeInfo;
    private NominMapper mapper;
    private MappingCase mappingCase;

    public DynamicPreprocessing(TypeInfo typeInfo, NominMapper mapper, MappingCase mappingCase) {
        this.typeInfo = typeInfo;
        this.mapper = mapper;
        this.mappingCase = mappingCase;
    }

    public Object preprocess(Object source) {
        Class targetClass = typeInfo.determineTypeDynamically(source);
        if (source == null || targetClass.isInstance(source)) return source;
        if (ConvertUtils.lookup(source.getClass(), targetClass) != null) return ConvertUtils.convert(source, targetClass);
        return mapper.map(source, targetClass, mappingCase.get());
    }
}