| /* |
| * 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.util.Collection; |
| |
| public class RelationalExpression extends ConstraintExpression { |
| private static final long serialVersionUID = 1L; |
| |
| public enum Operator { |
| EQUAL, |
| NOT_EQUAL, |
| LESS, |
| LESS_EQUAL, |
| GREATER, |
| GREATER_EQUAL |
| } |
| |
| private final ConstraintExpression left; |
| private final ConstraintExpression right; |
| private final Operator op; |
| |
| public RelationalExpression(ConstraintExpression left, ConstraintExpression right, Operator op) { |
| this.left = left; |
| this.right = right; |
| this.op = op; |
| } |
| |
| @Override |
| public ExpressionTag getTag() { |
| return ExpressionTag.RELATIONAL; |
| } |
| |
| public ConstraintExpression getLeft() { |
| return left; |
| } |
| |
| public ConstraintExpression getRight() { |
| return right; |
| } |
| |
| public Operator getOperator() { |
| return op; |
| } |
| |
| @Override |
| public void getChildren(Collection<ConstraintExpression> children) { |
| children.add(left); |
| children.add(right); |
| } |
| |
| @Override |
| protected void toString(StringBuilder buffer) { |
| buffer.append(getTag()).append('(').append(op).append(", "); |
| left.toString(buffer); |
| buffer.append(", "); |
| right.toString(buffer); |
| buffer.append(')'); |
| } |
| } |