129 lines
4.3 KiB
Java
129 lines
4.3 KiB
Java
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/*
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* @(#)FirstApplicableRuleAlg.java
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*
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* Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistribution of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistribution in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* Neither the name of Sun Microsystems, Inc. or the names of contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* This software is provided "AS IS," without a warranty of any kind. ALL
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* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
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* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
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* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
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* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
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* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
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* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
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* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
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* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
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* EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
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*
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* You acknowledge that this software is not designed or intended for use in
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* the design, construction, operation or maintenance of any nuclear facility.
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*/
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package com.sun.xacml.combine;
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import com.sun.xacml.EvaluationCtx;
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import com.sun.xacml.Rule;
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import com.sun.xacml.ctx.Result;
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import java.net.URI;
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import java.util.Iterator;
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import java.util.List;
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/**
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* This is the standard First Applicable rule combining algorithm. It looks
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* through the set of rules, finds the first one that applies, and returns
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* that evaluation result.
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*
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* @since 1.0
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* @author Seth Proctor
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*/
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public class FirstApplicableRuleAlg extends RuleCombiningAlgorithm
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{
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/**
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* The standard URN used to identify this algorithm
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*/
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public static final String algId =
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"urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm:" +
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"first-applicable";
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// a URI form of the identifier
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private static URI identifierURI;
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// exception if the URI was invalid, which should never be a problem
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private static RuntimeException earlyException;
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static {
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try {
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identifierURI = URI.create(algId);
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} catch (IllegalArgumentException e) {
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earlyException = e;
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}
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}
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/**
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* Standard constructor.
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*/
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public FirstApplicableRuleAlg() {
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super(identifierURI);
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if (earlyException != null) {
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throw earlyException;
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}
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}
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/**
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* Applies the combining rule to the set of rules based on the
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* evaluation context.
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*
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* @param context the context from the request
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* @param parameters a (possibly empty) non-null <code>List</code> of
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* <code>CombinerParameter<code>s
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* @param ruleElements the rules to combine
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*
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* @return the result of running the combining algorithm
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*/
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public Result combine(EvaluationCtx context, List<CombinerParameter> parameters,
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List<CombinerElement> ruleElements) {
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Iterator<CombinerElement> it = ruleElements.iterator();
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while (it.hasNext()) {
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Rule rule = ((RuleCombinerElement)(it.next())).getRule();
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Result result = rule.evaluate(context);
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int value = result.getDecision();
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// in the case of PERMIT, DENY, or INDETERMINATE, we always
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// just return that result, so only on a rule that doesn't
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// apply do we keep going...
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if (value != Result.DECISION_NOT_APPLICABLE) {
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return result;
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}
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}
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// if we got here, then none of the rules applied
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return new Result(Result.DECISION_NOT_APPLICABLE,
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context);
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}
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}
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