| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package edu.uci.ics.hyracks.algebricks.core.algebra.properties; |
| |
| import java.util.List; |
| |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable; |
| |
| public final class FunctionalDependency { |
| private List<LogicalVariable> head; |
| private List<LogicalVariable> tail; |
| |
| public FunctionalDependency(List<LogicalVariable> head, List<LogicalVariable> tail) { |
| this.head = head; |
| this.tail = tail; |
| } |
| |
| public List<LogicalVariable> getHead() { |
| return head; |
| } |
| |
| public List<LogicalVariable> getTail() { |
| return tail; |
| } |
| |
| @Override |
| public String toString() { |
| return head + "->" + tail; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (!(obj instanceof FunctionalDependency)) { |
| return false; |
| } else { |
| FunctionalDependency fd = (FunctionalDependency) obj; |
| return fd.getHead().equals(this.head) && fd.getTail().equals(this.tail); |
| } |
| } |
| |
| } |