/*
* Kodkod -- Copyright (c) 2005-present, Emina Torlak
*
* 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:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* 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.
*/
package kodkod.ast.operator;
/**
* Represents the multiplicity of an expression
* in a {@link kodkod.ast.MultiplicityFormula} or
* the multiplicity of a variable in a {@link kodkod.ast.Decl }.
*
* @author Emina Torlak
*/
public enum Multiplicity {
/** <tt>no expr</tt>: expr contains no elements. The 'no' multiplicity can only be used in a multiplicity formula. */
NO { public String toString() { return "no"; }},
/** <tt>lone expr</tt>: expr contains at most one element. */
LONE { public String toString() { return "lone"; }},
/** <tt>one expr</tt>: expr contains exactly one element. */
ONE { public String toString() { return "one"; }},
/** <tt>some expr</tt>: expr contains at least one element. */
SOME { public String toString() { return "some"; }},
/** <tt>v: set expr</tt>: v is a subset of expr. The 'set' multiplicity can only be used in a declaration. */
SET { public String toString() { return "set"; }}
}