/*
* @(#)URLStringCatFunction.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.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* 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
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
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*/
package com.sun.xacml.cond;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
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;
/**
* Represents the XACML 2.0 url-string-concatenate function.
*
* @since 2.0
* @author Seth Proctor
*
* Adding generic type support by Christian Mueller (geotools)
*/
public class URLStringCatFunction 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 URLStringCatFunction() {
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<? extends Expression> inputs) throws IllegalArgumentException {
// scan the list to make sure nothing returns a bag
Iterator<? extends Expression> it = inputs.iterator();
while (it.hasNext()) {
if (it.next().returnsBag())
throw new IllegalArgumentException(NAME_URI_STRING_CONCATENATE
+ " doesn't accept bags");
}
// nothing is a bag, so check using the no-bag method
checkInputsNoBag(inputs);
}
/**
* 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<? extends Expression> 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<? extends Expression> 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<? extends 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));
}
}
}