substringsnode.java

一个完整的XACML工程,学习XACML技术的好例子!

/*
* Copyright (c) 2000-2005, University of Salford
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without 
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*
* Redistributions of source code must retain the above copyright notice, this 
* list of conditions and the following disclaimer.
* 
* Redistributions 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 the University of Salford nor the names of its 
* contributors may be used to endorse or promote products derived from this 
* software without specific prior written permission. 
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
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package issrg.pba.rbac.xmlpolicy.ifstatement;

/**
 * This is the class for Substrings node of the IF-statement. Its functionality 
 * is
 * very much determined by OperationNode and StringInterpreter, which are 
 * configured to deliver the following semantics:
 *
 * <p>This operation expects two and only two Terms of type Types.STRING_TYPE, 
 * and 
 * returns a 
 * value of type Types.BOOLEAN_TYPE.
 * The evaluation result is "true", if and only if the first string Term occurs 
 * somewhere in the second string Term.
 *
 * <p>StringInterpreter provides the default implementation
 * of the Substrings operation.
 *
 * @see StringInterpreter
 *
 * @author A.Otenko
 */

public class SubstringsNode extends OperationNode {
  public static final String SUBSTRINGS_NODE = "Substrings";

  /**
   * Call this method to register the SubstringsNode with the XMLPolicyParser. 
   * It also
   * registers the StringInterpreter in SUBSTRINGS_MODE.
   *
   * @see StringInterpreter
   */
  public static void register(){
    try{
      issrg.pba.rbac.xmlpolicy.XMLPolicyParser.registerXMLNode(SUBSTRINGS_NODE, SubstringsNode.class);
    }catch (NoSuchMethodException nsme){
      nsme.printStackTrace();
    }

    OperationNode.registerInterpreterForNode(SUBSTRINGS_NODE, new StringInterpreter(StringInterpreter.SUBSTRINGS_MODE));
  }

  protected SubstringsNode() {
  }

  /**
   * This constructor builds a SubstringsNode given the XMLPolicyParser and the 
   * set of
   * attributes of this XML element. It expects that there are two and only two
   * child nodes.
   *
   * @param p - the XMLPolicyParser that builds this SubstringsNode
   * @param attr - the attributes of this XML element
   */
  public SubstringsNode(issrg.pba.rbac.xmlpolicy.XMLPolicyParser p, org.xml.sax.Attributes attrs){
    super(SUBSTRINGS_NODE, attrs, 2, 2);
  }
}