/*
 * 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.uima.annotator.dict_annot.impl;

/**
 * Filter operators
 */
public enum FilterOp {

   NULL, NOT_NULL, EQUALS, NOT_EQUALS, LESS, LESS_EQ, GREATER, GREATER_EQ;

   public String toString() {
      switch (this) {
      case NULL: {
         return "null";
      }
      case NOT_NULL: {
         return "!null";
      }
      case EQUALS: {
         return "=";
      }
      case NOT_EQUALS: {
         return "!=";
      }
      case LESS: {
         return "<";
      }
      case LESS_EQ: {
         return "<=";
      }
      case GREATER: {
         return "<";
      }
      case GREATER_EQ: {
         return "<=";
      }
      default: {
         return "";
      }
      }
   }
}
