+++ /dev/null
-/*--------------------------------------------------------------------------\r
- * Copyright 2009 Taro L. Saito\r
- *\r
- * Licensed under the Apache License, Version 2.0 (the "License");\r
- * you may not use this file except in compliance with the License.\r
- * You may obtain a copy of the License at\r
- *\r
- * http://www.apache.org/licenses/LICENSE-2.0\r
- *\r
- * Unless required by applicable law or agreed to in writing, software\r
- * distributed under the License is distributed on an "AS IS" BASIS,\r
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
- * See the License for the specific language governing permissions and\r
- * limitations under the License.\r
- *--------------------------------------------------------------------------*/\r
-//--------------------------------------\r
-// XerialJ\r
-//\r
-// FD.java\r
-// Since: May 13, 2009 5:39:16 PM\r
-//\r
-// $URL: http://www.xerial.org/svn/project/XerialJ/trunk/xerial-core/src/main/java/org/xerial/lens/relation/FD.java $\r
-// $Author: leo $\r
-//--------------------------------------\r
-package org.xerial.lens.relation;\r
-\r
-/**\r
- * Functional dependency that holds in the relation\r
- * \r
- * @author leo\r
- * \r
- */\r
-public enum FD {\r
- ONE_TO_ONE(":"), ONE_OR_MORE("+"), ZERO_OR_ONE("?"), ZERO_OR_MORE("*");\r
-\r
- private final String symbol;\r
-\r
- private FD(String displaySymbol) {\r
- this.symbol = displaySymbol;\r
- }\r
-\r
- public boolean isOneToOne() {\r
- return this == ONE_TO_ONE;\r
- }\r
-\r
- public boolean isOneToMany() {\r
- return this != ONE_TO_ONE;\r
- }\r
-\r
- @Override\r
- public String toString() {\r
- return symbol;\r
- }\r
-\r
-}\r