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/* Glazed Lists (c) 2003-2006 */
/* http://publicobject.com/glazedlists/ publicobject.com,*/
/* O'Dell Engineering Ltd.*/
package ca.odell.glazedlists.impl.beans;
// to implement the ThresholdEvaluator interface
import ca.odell.glazedlists.ThresholdList;
/**
* A ThresholdEvaluator that is powered by JavaBeans and Reflection.
*
* @author <a href="mailto:kevin@swank.ca">Kevin Maltby</a>
*/
public final class BeanThresholdEvaluator<E> implements ThresholdList.Evaluator<E> {
private String propertyName = null;
private BeanProperty<E> beanProperty = null;
public BeanThresholdEvaluator(String propertyName) {
this.propertyName = propertyName;
}
/**
* Returns an integer value for an Object to be used to
* compare that object against a threshold. This value is
* not relative to any other object unlike a <code>Comparator</code>.
*/
public int evaluate(E object) {
if(beanProperty == null) loadPropertyDescriptors(object);
Object property = beanProperty.get(object);
return ((Integer)property).intValue();
}
/**
* Loads the property descriptors which are used to invoke property
* access methods using the property names.
*/
private void loadPropertyDescriptors(Object beanObject) {
Class<E> beanClass = (Class<E>) beanObject.getClass();
beanProperty = new BeanProperty<E>(beanClass, propertyName, true, false);
}
}
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