// Path: src/main/java/es/tid/fiware/iot/ac/util/Xml.java
// public class Xml {
// 
//     // DocumentBuilder is not thread safe: <http://stackoverflow.com/a/3442674/1035380>
// 
//     private static DocumentBuilder db() {
//         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
//         factory.setIgnoringComments(true);
//         factory.setNamespaceAware(true);
//         try {
//             return factory.newDocumentBuilder();
//         } catch (ParserConfigurationException e) {
//             throw new RuntimeException(e);
//         }
//     }
// 
//     public static String toString(Document doc) throws TransformerConfigurationException, TransformerException {
//         TransformerFactory tf = TransformerFactory.newInstance();
//         Transformer transformer = tf.newTransformer();
//         transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
//         StringWriter writer = new StringWriter();
//         transformer.transform(new DOMSource(doc), new StreamResult(writer));
//         return writer.getBuffer().toString().replaceAll("\n|\r", "");
//     }
//     
//     public static Document toXml(String str) throws IOException, SAXException {
//         return db().parse(new InputSource(new StringReader(str)));
//     }
// 
//     public static Document newDocument() {
//         return db().newDocument();
//     }
// }


import java.util.List;
import es.tid.fiware.iot.ac.util.Xml;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javax.xml.xpath.*;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
package es.tid.fiware.iot.ac.xacml;

/*
 * Copyright 2014 Telefonica Investigación y Desarrollo, S.A.U
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */



/**
 * Some XACML utilities methods.
 */
public class Extractors {

    // XPath is not thread safe: <http://stackoverflow.com/a/3442674/1035380>

    private static XPathExpression decisionExp() {
        return buildExp("//*[local-name()='Decision']/text()");
    }

    private static XPathExpression sujectIdsExp() {
        return buildExp("//*[@AttributeId='urn:oasis:names:tc:xacml:1.0:subject:subject-id']/*[local-name()='AttributeValue']");
    }

    private static XPathExpression policyIdExp() {
        return buildExp("//*[local-name()='Policy']/@PolicyId");
    }

    private static XPathExpression policysetIdExp() {
        return buildExp("//*[local-name()='PolicySet']/@PolicySetId");
    }

    public static Collection<String> extractSubjectIds(String xacmlRequest)
            throws XPathExpressionException, IOException, SAXException {

// Path: src/main/java/es/tid/fiware/iot/ac/util/Xml.java
// public class Xml {
// 
//     // DocumentBuilder is not thread safe: <http://stackoverflow.com/a/3442674/1035380>
// 
//     private static DocumentBuilder db() {
//         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
//         factory.setIgnoringComments(true);
//         factory.setNamespaceAware(true);
//         try {
//             return factory.newDocumentBuilder();
//         } catch (ParserConfigurationException e) {
//             throw new RuntimeException(e);
//         }
//     }
// 
//     public static String toString(Document doc) throws TransformerConfigurationException, TransformerException {
//         TransformerFactory tf = TransformerFactory.newInstance();
//         Transformer transformer = tf.newTransformer();
//         transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
//         StringWriter writer = new StringWriter();
//         transformer.transform(new DOMSource(doc), new StreamResult(writer));
//         return writer.getBuffer().toString().replaceAll("\n|\r", "");
//     }
//     
//     public static Document toXml(String str) throws IOException, SAXException {
//         return db().parse(new InputSource(new StringReader(str)));
//     }
// 
//     public static Document newDocument() {
//         return db().newDocument();
//     }
// }


// Path: src/main/java/es/tid/fiware/iot/ac/xacml/Extractors.java
import java.util.List;
import es.tid.fiware.iot.ac.util.Xml;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javax.xml.xpath.*;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;

package es.tid.fiware.iot.ac.xacml;

/*
 * Copyright 2014 Telefonica Investigación y Desarrollo, S.A.U
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */



/**
 * Some XACML utilities methods.
 */
public class Extractors {

    // XPath is not thread safe: <http://stackoverflow.com/a/3442674/1035380>

    private static XPathExpression decisionExp() {
        return buildExp("//*[local-name()='Decision']/text()");
    }

    private static XPathExpression sujectIdsExp() {
        return buildExp("//*[@AttributeId='urn:oasis:names:tc:xacml:1.0:subject:subject-id']/*[local-name()='AttributeValue']");
    }

    private static XPathExpression policyIdExp() {
        return buildExp("//*[local-name()='Policy']/@PolicyId");
    }

    private static XPathExpression policysetIdExp() {
        return buildExp("//*[local-name()='PolicySet']/@PolicySetId");
    }

    public static Collection<String> extractSubjectIds(String xacmlRequest)
            throws XPathExpressionException, IOException, SAXException {

        Document xacml = Xml.toXml(xacmlRequest);