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Java library to map flat record - ResultSet, csv - to java object with minimum configuration and low footprint.
There is a newer version: 1.10.3
package org.sfm.map.impl;

import org.sfm.map.ColumnDefinition;
import org.sfm.map.FieldKey;
import org.sfm.map.MapperBuilderErrorHandler;
import org.sfm.map.MapperBuildingException;
import org.sfm.reflect.TypeHelper;
import org.sfm.reflect.meta.*;
import org.sfm.utils.ForEachCallBack;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

public final class PropertyMappingsBuilder, D extends ColumnDefinition> {

	protected final PropertyFinder propertyFinder;
	
	protected final List> properties = new ArrayList>();

	protected final PropertyNameMatcherFactory propertyNameMatcherFactory;

	private final MapperBuilderErrorHandler mapperBuilderErrorHandler;
	private final ClassMeta classMeta;

	protected boolean modifiable = true;

	public PropertyMappingsBuilder(final ClassMeta classMeta,
								   final PropertyNameMatcherFactory propertyNameMatcherFactory,
								   final MapperBuilderErrorHandler mapperBuilderErrorHandler) throws MapperBuildingException {
		this.mapperBuilderErrorHandler = mapperBuilderErrorHandler;
		this.propertyFinder = classMeta.newPropertyFinder();
		this.propertyNameMatcherFactory = propertyNameMatcherFactory;
		this.classMeta = classMeta;
	}

	
	@SuppressWarnings("unchecked")
    public  PropertyMeta addProperty(final K key, final D columnDefinition) {
		
		if (!modifiable) throw new IllegalStateException("Builder not modifiable");

        if (columnDefinition.ignore()) {
            properties.add(null);
            return null;
        }

		@SuppressWarnings("unchecked")
		final PropertyMeta prop = (PropertyMeta) propertyFinder.findProperty(propertyNameMatcherFactory.newInstance(key));

		if (prop == null) {
			mapperBuilderErrorHandler.propertyNotFound(classMeta.getType(), key.getName());
			properties.add(null);
            return null;
		} else {
			addProperty(key, columnDefinition, prop);
            return prop;
		}
	}

	public  void addProperty(final K key, final D columnDefinition, final PropertyMeta prop) {
		if (columnDefinition.hasCustomSource()) {
            Type type;
            if (prop.isSubProperty()) {
                type = ((SubPropertyMeta)prop).getLeafType();
            } else {
                type = prop.getType();
            }

            if (!checkTypeCompatibility(key, columnDefinition.getCustomSourceReturnType(), type)) {
				properties.add(null);
				return;
			}
		}
		properties.add(new PropertyMapping(prop, key, columnDefinition));
	}

	private boolean checkTypeCompatibility(K key, Type customSourceReturnType, Type propertyMetaType) {
		if (customSourceReturnType == null) {
			// cannot determine type
			return true;
		} else if(!areCompatible(propertyMetaType, customSourceReturnType)) {
			mapperBuilderErrorHandler.customFieldError(key, "Incompatible customReader type " + customSourceReturnType +  " expected " + propertyMetaType);
			return false;
		}
		return true;
	}

	private boolean areCompatible(Type propertyMetaType, Type customSourceReturnType) {
		Class propertyMetaClass = TypeHelper.toBoxedClass(TypeHelper.toClass(propertyMetaType));
		Class customSourceReturnClass = TypeHelper.toBoxedClass(TypeHelper.toClass(customSourceReturnType));
		return propertyMetaClass.isAssignableFrom(customSourceReturnClass);
	}


	public List getKeys() {
		modifiable = false;
		
		List  keys = new ArrayList(properties.size());
        for (PropertyMapping propMapping : properties) {
            if (propMapping != null) {
                keys.add(propMapping.getColumnKey());
            } else {
                keys.add(null);
            }

        }
		return keys;
	}

	public void forEachConstructorProperties(ForEachCallBack> handler)  {
		modifiable = false;

        for (PropertyMapping property : properties) {
            if (property != null) {
                PropertyMeta propertyMeta = property.getPropertyMeta();
                if (propertyMeta != null && propertyMeta.isConstructorProperty()) {
                    handler.handle(property);
                }
            }
        }
	}
	
	public void forEachSubProperties(ForEachCallBack> handler)  {
		modifiable = false;

        for (PropertyMapping property : properties) {
            if (property != null) {
                PropertyMeta propertyMeta = property.getPropertyMeta();
                if (propertyMeta != null && propertyMeta.isSubProperty()) {
                    handler.handle(property);
                }
            }
        }
	}

	public >> H forEachProperties(H handler)  {
		return forEachProperties(handler, -1 );
	}
	
	public >> F forEachProperties(F handler, int start)  {
		return forEachProperties(handler, start, -1 );
	}
	
	public >> F forEachProperties(F handler, int start, int end)  {
		modifiable = false;
        for (PropertyMapping prop : properties) {
            if (prop != null
                    && (prop.getColumnKey().getIndex() >= start || start == -1)
                    && (prop.getColumnKey().getIndex() < end || end == -1)) {
                handler.handle(prop);
            }
        }
		return handler;
	}


	public PropertyFinder getPropertyFinder() {
		modifiable = false;
		return propertyFinder;
	}


	public int size() {
		return properties.size();
	}


	public PropertyMapping get(int i) {
		modifiable = false;
		return properties.get(i);
	}

    public boolean isDirectProperty() {
        return  (properties.size() == 1 && properties.get(0) != null && properties.get(0).getPropertyMeta() instanceof DirectClassMeta.DirectPropertyMeta);
    }
}