hibernate-commits

[<pao...@us...>]

Update of /cvsroot/hibernate/HibernateExt/metadata/src/java/org/hibernate/reflection/java
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv24797/metadata/src/java/org/hibernate/reflection/java

Added Files:
	Comprehension.java Condition.java 
Log Message:
Collection comprehension utilities

--- NEW FILE: Comprehension.java ---
package org.hibernate.reflection.java;

import java.util.Collection;

/**
 * @author Paolo Perrotta
 */
public class Comprehension {

	public static <T extends Collection<E>, E> T select(T collection, Condition<E> condition) {
		T result = getCollectionOfSameTypeAs( collection );
		for ( E item : collection )
			if ( condition.applyTo( item ) )
				result.add( item );
		return result;
	}

	private static <T> T getCollectionOfSameTypeAs(T collection) {
		try {
			return collection.getClass().newInstance();
		} catch ( Exception e ) {
			throw new IllegalArgumentException( "Cannot instance collection " + collection );
		}
	}
}

--- NEW FILE: Condition.java ---
package org.hibernate.reflection.java;

/**
 * @author Paolo Perrotta
 */
public interface Condition<T> {
	boolean applyTo(T item);
}