| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 at |
| * |
| * 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 org.apache.ambari.server.api.predicate.operators; |
| |
| /** |
| * Operator representation. |
| */ |
| public interface Operator { |
| |
| /** |
| * Operator types. |
| */ |
| public enum TYPE { |
| LESS, |
| LESS_EQUAL, |
| GREATER, |
| GREATER_EQUAL, |
| EQUAL, |
| NOT_EQUAL, |
| AND, |
| OR, |
| NOT, |
| IN, |
| IS_EMPTY |
| } |
| |
| /** |
| * The highest base operator precedence level. |
| */ |
| public static final int MAX_OP_PRECEDENCE = 3; |
| |
| /** |
| * Get the operator type. |
| * |
| * @return the operator type |
| */ |
| public TYPE getType(); |
| |
| /** |
| * Obtain the precedence of the operator. |
| * This value is calculated based on the operators base precedence and the context of the |
| * surrounding expressions. Higher precedence values have higher precedence. |
| * |
| * @return the precedence of this operator in it's current context |
| */ |
| public int getPrecedence(); |
| } |