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package com.googlecode.objectify.condition;

import java.util.Collection;
import java.util.Map;


/**
 * 
Simple If condition that returns true if the value is null or empty.
 * The value can be one of:

 * 
    
 * 
  • java.lang.String
    • 
 * 
  • java.util.Collection
    • 
 * 
  • java.util.Map
    • 
 * 

 * 
 * @author Jeff Schnitzer 
 */
public class IfEmpty extends ValueIf
{
	@Override
	public boolean matches(Object value)
	{
		if (value == null)
			return true;
		
		if (value instanceof String)
			return ((String)value).isEmpty();
		
		if (value instanceof Collection)
			return ((Collection)value).isEmpty();
		
		if (value instanceof Map)
			return ((Map)value).isEmpty();

		throw new IllegalArgumentException("Don't know what to do with something of type " + value.getClass().getName());
	}
} 















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