/*
* @(#)ConditionBagFunction.java
*
* Copyright 2004-206 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
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
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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 org.jboss.security.xacml.sunxacml.cond;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Set;
import org.jboss.security.xacml.sunxacml.EvaluationCtx;
import org.jboss.security.xacml.sunxacml.attr.AttributeValue;
import org.jboss.security.xacml.sunxacml.attr.BagAttribute;
import org.jboss.security.xacml.sunxacml.attr.BooleanAttribute;
/**
* Specific <code>BagFunction</code> class that supports the single
* condition bag function: type-is-in.
*
* @since 1.2
* @author Seth Proctor
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public class ConditionBagFunction extends BagFunction
{
// mapping of function name to its associated argument type
private static HashMap argMap;
/**
* Static initializer that sets up the argument info for all the
* supported functions.
*/
static {
argMap = new HashMap();
for (int i = 0; i < baseTypes.length; i++) {
String [] args = { baseTypes[i], baseTypes[i] };
argMap.put(FUNCTION_NS + simpleTypes[i] + NAME_BASE_IS_IN, args);
}
for (int i = 0; i < baseTypes2.length; i++) {
String [] args = { baseTypes2[i], baseTypes2[i] };
argMap.put(FUNCTION_NS_2 + simpleTypes2[i] + NAME_BASE_IS_IN,
args);
}
}
/**
* Constructor that is used to create one of the condition standard bag
* functions. The name supplied must be one of the standard XACML
* functions supported by this class, including the full namespace,
* otherwise an exception is thrown. Look in <code>BagFunction</code>
* for details about the supported names.
*
* @param functionName the name of the function to create
*
* @throws IllegalArgumentException if the function is unknown
*/
public ConditionBagFunction(String functionName) {
super(functionName, 0, getArguments(functionName));
}
/**
* Constructor that is used to create instances of condition bag
* functions for new (non-standard) datatypes. This is equivalent to
* using the <code>getInstance</code> methods in <code>BagFunction</code>
* and is generally only used by the run-time configuration code.
*
* @param functionName the name of the new function
* @param datatype the full identifier for the supported datatype
*/
public ConditionBagFunction(String functionName, String datatype) {
super(functionName, 0, new String [] {datatype, datatype});
}
/**
* Private helper that returns the argument types for the given standard
* function.
*/
private static String [] getArguments(String functionName) {
String [] args = (String [])(argMap.get(functionName));
if (args == null)
throw new IllegalArgumentException("unknown bag function: " +
functionName);
return args;
}
/**
* Returns a <code>Set</code> containing all the function identifiers
* supported by this class.
*
* @return a <code>Set</code> of <code>String</code>s
*/
public static Set getSupportedIdentifiers() {
return Collections.unmodifiableSet(argMap.keySet());
}
/**
* Evaluate the function, using the specified parameters.
*
* @param inputs a <code>List</code> of <code>Evaluatable</code>
* objects representing the arguments passed to the function
* @param context an <code>EvaluationCtx</code> so that the
* <code>Evaluatable</code> objects can be evaluated
* @return an <code>EvaluationResult</code> representing the
* function's result
*/
public EvaluationResult evaluate(List inputs, EvaluationCtx context) {
// Evaluate the arguments
AttributeValue [] argValues = new AttributeValue[inputs.size()];
EvaluationResult result = evalArgs(inputs, context, argValues);
if (result != null)
return result;
// *-is-in takes a bag and an element of baseType and
// returns a single boolean value
AttributeValue item = (AttributeValue)(argValues[0]);
BagAttribute bag = (BagAttribute)(argValues[1]);
return new EvaluationResult(BooleanAttribute.
getInstance(bag.contains(item)));
}
}