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/*
 * 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.openjpa.persistence.query;

/**
 * Enumeration of operator that operates on a single expression to generate
 * another expression.
 *
 * @see UnaryOperatorExpression
 *
 * @author Pinaki Poddar
 *
 */
public enum UnaryFunctionalOperator {
	ABS("ABS"),
	ALL("ALL"),
	ANY("ANY"),
	AVG("AVG"),
	CONCAT("CONCAT"),
	COUNT("COUNT"),
	DISTINCT("DISTINCT"),
	EXISTS("EXISTS"),
	INDEX("INDEX"),
	LENGTH("LENGTH"),
	LOCATE("LOCATE"),
	LOWER("LOWER"),
	MAX("MAX"),
	MIN("MIN"),
	MINUS("-"),
	SIZE("SIZE"),
	SOME("SOME"),
	SQRT("SQRT"),
	SUBSTR("SUBSTRING"),
	SUM("SUM"),
	TRIM("TRIM"),
	TYPE("TYPE"),
	UPPER("UPPER");

	private final String _symbol;

	UnaryFunctionalOperator(String symbol) {
		_symbol = symbol;
	}

	@Override
    public String toString() {
		return _symbol;
	}
}