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Commons Mapper
There is a newer version: 5.0.0-M1
package org.sklsft.commons.mapper.beans;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

/**
 * Representation of a field with its getters and setters methods

 * properties are public because of intensive use in mappers, ...
 * Generic parameters are built at instantiation
 * 
 * @author NTHI
 *
 */
public class AccessibleField {

	public Field field;
	public Method getter;
	public Method setter;
	public List> genericParameters;
	
	/**
	 * constructor
	 */
	public AccessibleField(Field field,Method getter, Method setter) {
		this.field = field;
		this.getter = getter;
		this.setter = setter;
		this.genericParameters = getGenericParameters();
	}
	
	
	public Object getValue(Object object) {
		
		try {
			return getter.invoke(object);
		} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
			throw new IllegalArgumentException(e);
		}
	}
	
	
	public void setValue(Object fieldValue, Object object) {
		
		try {
			setter.invoke(object, fieldValue);
		} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
			throw new IllegalArgumentException(e);
		}
	}

	
	/**
	 * determines wheter the field can be mapped with another field
	 * Parameterized fields are excluded for the moment
	 * @param field2
	 * @return
	 */
	public boolean isCompatibleWith(AccessibleField field2) {
		
		if (isParameterized()) {
			return false;
		}
		
		if (field2.isParameterized()) {
			return false;
		}
		
		if (!field2.field.getType().equals(field.getType())) {
			return false;
		}
		
		return true;
	}
	
	
	/**
	 * construct the Parameterized fields through setters arguments
	 * If the field has no Generic Parameters, returns an empty list
	 * @return
	 */
	private List> getGenericParameters() {
		
		List> result = new ArrayList>(1);
		
		if (isParameterized()) {
			ParameterizedType parameterizedType = (ParameterizedType) setter.getGenericParameterTypes()[0];
			Type[] types = parameterizedType.getActualTypeArguments();
			
			for (Type type:types) {
				result.add((Class)type);
			}
		}
		return result;
	}
	
	
	/**
	 * Useful when we need to introspect the elements of an iterable property
	 * @return
	 */
	public boolean isIterable() {
		return Iterable.class.isAssignableFrom(field.getType());
	}
	
	
	public Class getIterableClass() {
		return genericParameters.get(0);
	}
	
	
	/**
	 * Determines whether the field has Generic Parameters
	 * @return
	 */
	public boolean isParameterized() {
		return field.getType().getTypeParameters().length > 0;
	}
}