/*
* @(#)Evaluatable.java
*
* Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistribution in binary form must reproduce the above copyright
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* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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package com.sun.xacml.cond;
import java.util.List;
import com.sun.xacml.EvaluationCtx;
/**
* Generic interface that is implemented by all objects that can be evaluated directly (
* <code>AttributeDesignator</code>, <code>Apply</code>, <code>AttributeValue</code>, etc.). As of
* version 2.0 several methods were extracted to the new <code>Expression</code> super-interface.
*
* @since 1.0
* @author Seth Proctor
*/
public interface Evaluatable extends Expression {
/**
* Evaluates the object using the given context, and either returns an error or a resulting
* value.
*
* @param context
* the representation of the request
*
* @return the result of evaluation
*/
public EvaluationResult evaluate(EvaluationCtx context);
/**
* Tells whether evaluation will return a bag or a single value.
*
* @deprecated As of 2.0, you should use the <code>returnsBag</code> method from the
* super-interface <code>Expression</code>.
*
* @return true if evaluation will return a bag, false otherwise
*/
public boolean evaluatesToBag();
/**
* Returns all children, in order, of this element in the Condition tree, or en empty set if
* this element has no children. In XACML 1.x, only the ApplyType ever has children.
*
* @return a <code>List</code> of <code>Evaluatable</code>s
*/
public List<Expression> getChildren();
}