| /* |
| * 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.api.constraints.expressions; |
| |
| import java.io.Serializable; |
| import java.util.Collection; |
| |
| public abstract class ConstraintExpression implements Serializable { |
| private static final long serialVersionUID = 1L; |
| |
| public enum ExpressionTag { |
| CONSTANT, |
| PARTITION_COUNT, |
| PARTITION_LOCATION, |
| } |
| |
| public abstract ExpressionTag getTag(); |
| |
| public abstract void getChildren(Collection<ConstraintExpression> children); |
| |
| @Override |
| public final String toString() { |
| StringBuilder buffer = new StringBuilder(); |
| toString(buffer); |
| return buffer.toString(); |
| } |
| |
| protected abstract void toString(StringBuilder buffer); |
| } |