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/*
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* This program is a part of the IoTa Project.
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*
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* Copyright © 2011-2012 Université de Caen Basse-Normandie, GREYC
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* Copyright © 2011 Orange Labs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* <http://www.gnu.org/licenses/>
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*
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* See AUTHORS for a list of contributors.
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*/
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package fr.unicaen.iota.xacml.cond;
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import com.sun.xacml.EvaluationCtx;
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import com.sun.xacml.attr.AttributeValue;
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import com.sun.xacml.attr.BooleanAttribute;
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import com.sun.xacml.cond.Evaluatable;
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import com.sun.xacml.cond.EvaluationResult;
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import com.sun.xacml.cond.FunctionBase;
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import java.util.Iterator;
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import java.util.List;
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public class OneOrGlobalFunction extends FunctionBase {
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public static final String NAME_GLOBAL_DENY = FUNCTION_NS + "global-deny-one-permit";
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public static final String NAME_GLOBAL_PERMIT = FUNCTION_NS + "global-permit-one-deny";
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public static final int ID_GLOBAL_DENY = 0;
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public static final int ID_GLOBAL_PERMIT = 1;
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public OneOrGlobalFunction(String functionName) {
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super(functionName, getId(functionName), BooleanAttribute.identifier,
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false, -1, -1, BooleanAttribute.identifier, false);
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}
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public String getValue() {
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return NAME_GLOBAL_PERMIT.equals(getFunctionName()) ? "ACCEPT" : "DENY";
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}
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public static int getId(String functionName) {
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if (NAME_GLOBAL_DENY.equals(functionName)) {
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return ID_GLOBAL_DENY;
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} else if (NAME_GLOBAL_PERMIT.equals(functionName)) {
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return ID_GLOBAL_PERMIT;
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} else {
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throw new IllegalArgumentException("unknown one or global function: " + functionName);
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}
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}
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@Override
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public String toString() {
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return "Function = " + this.getFunctionName();
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}
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@Override
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public EvaluationResult evaluate(List inputs, EvaluationCtx context) {
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// Evaluate the arguments one by one. As soon as we can
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// return a result, do so. Return Indeterminate if any argument
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// evaluated is indeterminate.
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Iterator it = inputs.iterator();
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while (it.hasNext()) {
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Evaluatable eval = (Evaluatable) (it.next());
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// Evaluate the argument
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EvaluationResult result = eval.evaluate(context);
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if (result.indeterminate()) {
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return result;
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}
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AttributeValue value = result.getAttributeValue();
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boolean argBooleanValue = ((BooleanAttribute) value).getValue();
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switch (getFunctionId()) {
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case ID_GLOBAL_DENY:
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if (argBooleanValue) {
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return EvaluationResult.getTrueInstance();
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}
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break;
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case ID_GLOBAL_PERMIT:
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if (argBooleanValue) {
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return EvaluationResult.getFalseInstance();
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}
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break;
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}
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}
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if (getFunctionId() == ID_GLOBAL_DENY) {
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return EvaluationResult.getFalseInstance();
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} else {
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return EvaluationResult.getTrueInstance();
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}
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}
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}
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