com.googlecode.objectify.condition.PojoIf Maven / Gradle / Ivy

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*** THIS VERSION UPLOADED FOR USE WITH CEDAR-COMMON, TO AVOID DEPENDENCIES ON GOOGLE CODE-BASED MAVEN REPOSITORIES. *** The simplest convenient interface to the Google App Engine datastore

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package com.googlecode.objectify.condition;

/**
 * Base class for If classes that test against a whole POJO object.  This allows
 * partial indexes to test against field values which are not the field being indexed.
 * 
 * The pojo will be an entity of the field is on an entity, or an embedded class
 * if the field is on an embedded class.
 * 
 * All concrete instances of this interface must have either a no-arg constructor
 * or a constructor that takes {@code Class, Field} parameters.
 * 
 * @author Jeff Schnitzer 
 */
abstract public class PojoIf implements If
{
	/**
	 * Override this method to test a whole pojo for your condition.  The pojo might
	 * be an entity or an embedded class object - whichever holds the field being tested. 
	 */
	abstract public boolean matches(V pojo);
	
	/* (non-Javadoc)
	 * @see com.googlecode.objectify.condition.If#matches(java.lang.Object, java.lang.Object)
	 */
	@Override
	final public boolean matches(Object value, V onPojo)
	{
		return this.matches(onPojo);
	}
}