/**
* Copyright (C) 2001-2017 by RapidMiner and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapidminer.com
*
* This program is free software: you can redistribute it and/or modify it under the terms of the
* GNU Affero General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License along with this program.
* If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.ports.metadata;
/**
* Can be used to indicate whether we know the attribute set exactly, or only know that it is a
* subset/superset of a given set.
*
* @author Simon Fischer
* */
public enum SetRelation {
UNKNOWN("unknown"), SUPERSET("\u2287"), SUBSET("\u2286"), EQUAL("=");
private String description;
private SetRelation(String description) {
this.description = description;
}
public SetRelation merge(SetRelation relation) {
switch (relation) {
case EQUAL:
return this;
case SUBSET:
switch (this) {
case SUBSET:
case EQUAL:
return SUBSET;
case SUPERSET:
case UNKNOWN:
return UNKNOWN;
}
case SUPERSET:
switch (this) {
case SUPERSET:
case EQUAL:
return SUPERSET;
case SUBSET:
case UNKNOWN:
return UNKNOWN;
}
case UNKNOWN:
default:
return UNKNOWN;
}
}
@Override
public String toString() {
return description;
}
}