?? axiom.java
字號:
package org.ofbiz.rules.engine;
/**
* <p><b>Title:</b> Axiom
* <p><b>Description:</b> None
* <p>Copyright (c) 1999 Steven J. Metsker.
* <p>Copyright (c) 2001 The Open For Business Project - www.ofbiz.org
*
* <p>Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* <p>The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* <p>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
* OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
* THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* <br>
* <p>In practice, an Axiom is either a fact or a rule, the two
* types of objects that can appear in a program. More
* precisely, an Axiom has a head structure with which a
* consulting structure can unify, and an Axiom can produce
* a ProvableAxiom.
* <p>
* Facts are simply true, and return themselves as
* DynamicAxioms. To prove itself, a Rule needs to
* create a DynamicAxiom that can attempt to prove
* itself against an axiom source.
*
* @author Steven J. Metsker
* @version 1.0
*/
public interface Axiom {
/**
* Return an axiom that a consulting structure can use
* to prove itself.
*
* @return an axiom that a consulting structure can use
* to prove itself.
*/
DynamicAxiom dynamicAxiom(AxiomSource as);
/**
* Return the first structure of this axiom.
*
* @return the first structure of this axiom
*/
Structure head();
}
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