/*
* @(#)URIStringCatFunction.java
*
* Copyright 2006 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 com.sun.xacml.cond;
import com.sun.xacml.EvaluationCtx;
import com.sun.xacml.attr.AnyURIAttribute;
import com.sun.xacml.attr.AttributeValue;
import com.sun.xacml.attr.StringAttribute;
import com.sun.xacml.ctx.Status;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* Represents the XACML 2.0 uri-string-concatenate function.
*
* @since 2.0
* @author Seth Proctor
*/
public class URIStringCatFunction extends FunctionBase
{
/**
* Standard identifier for the url-string-concatenate function.
*/
public static final String NAME_URI_STRING_CONCATENATE =
FUNCTION_NS_2 + "uri-string-concatenate";
/**
* Creates an instance of this function.
*/
public URIStringCatFunction() {
super(NAME_URI_STRING_CONCATENATE, 0, AnyURIAttribute.identifier,
false);
}
/**
* Checks the inputs of this function.
*
* @param inputs a <code>List></code> of <code>Evaluatable</code>s
*
* @throws IllegalArgumentException if the inputs won't work
*/
public void checkInputs(List<Expression> inputs) throws IllegalArgumentException {
// scan the list to make sure nothing returns a bag
Iterator<Expression> it = inputs.iterator();
while (it.hasNext()) {
if (it.next().returnsBag() ) {
throw new IllegalArgumentException(NAME_URI_STRING_CONCATENATE
+ " doesn't accept bags");
}
}
List<Evaluatable> copy = new ArrayList<Evaluatable>(inputs.size());
for (int i = 0; i < inputs.size(); ++i ) {
copy.add( (Evaluatable)inputs.get(i));
}
// nothing is a bag, so check using the no-bag method
checkInputsNoBag(copy);
}
/**
* Checks the inputs of this function assuming no parameters are bags.
*
* @param inputs a <code>List></code> of <code>Evaluatable</code>s
*
* @throws IllegalArgumentException if the inputs won't work
*/
public void checkInputsNoBag(List<Evaluatable> inputs) throws IllegalArgumentException {
// make sure it's long enough
if (inputs.size() < 2) {
throw new IllegalArgumentException("not enough args to " +
NAME_URI_STRING_CONCATENATE);
}
// check that the parameters are of the correct types...
Iterator<Evaluatable> it = inputs.iterator();
// ...the first argument must be a URI...
if (! it.next().getType().toString().equals(AnyURIAttribute.identifier)) {
throw new IllegalArgumentException("illegal parameter");
}
// ...and all following arguments must be strings
while (it.hasNext()) {
if (! ((Expression)(it.next())).getType().toString().
equals(StringAttribute.identifier)) {
throw new IllegalArgumentException("illegal parameter");
}
}
}
/**
* Evaluates the function given the input data. This function expects
* an <code>AnyURIAttribute</code> followed by one or more
* <code>StringAttribute</code>s, and returns an
* <code>AnyURIAttribute</code>.
*
* @param inputs the input agrument list
* @param context the representation of the request
*
* @return the result of evaluation
*/
public EvaluationResult evaluate(List<Expression> inputs, EvaluationCtx context) {
// Evaluate the arguments
AttributeValue [] argValues = new AttributeValue[inputs.size()];
EvaluationResult result = evalArgs(inputs, context, argValues);
if (result != null) {
return result;
}
// the first argument is always a URI
String str = ((AnyURIAttribute)(argValues[0])).getValue().toString();
// the remaining arguments are strings
for (int i = 1; i < argValues.length; i++) {
str += ((StringAttribute)(argValues[i])).getValue();
}
// finally, try to convert the string back to a URI
try {
return new EvaluationResult(new AnyURIAttribute(new URI(str)));
} catch (URISyntaxException use) {
List<String> code = new ArrayList<String>();
code.add(Status.STATUS_PROCESSING_ERROR);
String message = NAME_URI_STRING_CONCATENATE + " didn't produce"
+ " a valid URI: " + str;
return new EvaluationResult(new Status(code, message));
}
}
}