implication.java

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/*
 * $Header: /home/cvs/jakarta-tomcat/src/share/org/apache/tomcat/util/pattern/Implication.java,v 1.1 1999/11/27 21:45:39 harishp Exp $
 * $Revision: 1.1 $
 * $Date: 1999/11/27 21:45:39 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  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. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact [e-mail].
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 * 5. Products derived from this software may not be called "Apache"
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
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 * <http://www.apache.org/>.
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 * [Additional notices, if required by prior licensing conditions]
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 */ 

package org.apache.tomcat.util.pattern;

/**
 * This interface should be implemented by the objects that allow for
 * implies test. implies is not same as equality or comparator tests.
 * In fact equality test is a special form of implies test (when
 * a => b and b => a). In other words, implies is a subset test. 
 * <BR>
 * This test is useful when doing pattern matching: For example,
 *
 * /foo/bar => /foo/*
 * /foo/bar => /*
 * /foo/bar => /foo/bar etc...
 *
 * @author Harish Prabandham
 */

public interface Implication {
    /**
     * Implementation of this method should check if the current object
     * implies the given object.
     * @return true if this object implies given object. false otherwise
     */
    public boolean implies(Object obj);
}