package org.apache.openjpa.persistence.util;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Locale;
import java.util.Set;
/*
* 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.
*/
/**
* Utility to test validity of identifier or parameter name.
*
* @author Pinaki Poddar
* @since 2.0.0
*
*/
public class ReservedWords {
public static final Set<String> KEYWORDS = new HashSet<String>();
static {
KEYWORDS.addAll(Arrays.asList(
"ABS", "ALL", "AND", "ANY", "AS", "ASC", "AVG",
"BETWEEN", "BIT_LENGTH", "BOTH", "BY",
"CASE", "CHAR_LENGTH", "CHARACTER_LENGTH", "CLASS", "COALESCE", "CONCAT", "COUNT",
"CURRENT_DATE", "CURRENT_TIME", "CURRENT_TIMESTAMP",
"DELETE", "DESC", "DISTINCT",
"ELSE", "EMPTY", "END", "ENTRY", "ESCAPE", "EXISTS",
"FALSE", "FETCH", "FROM",
"GROUP",
"HAVING",
"IN", "INDEX", "INNER", "IS",
"JOIN",
"KEY",
"LEADING", "LEFT", "LENGTH", "LIKE", "LOCATE", "LOWER",
"MAX", "MEMBER", "MIN", "MOD",
"NEW", "NOT", "NULL", "NULLIF",
"OBJECT", "OF", "OR", "ORDER", "OUTER",
"POSITION",
"SELECT", "SET", "SIZE", "SOME", "SQRT", "SUBSTRING", "SUM",
"THEN", "TRAILING", "TRIM", "TRUE", "TYPE",
"UNKNOWN[50]", "UPDATE", "UPPER",
"VALUE",
"WHEN", "WHERE"));
};
/**
* Affirms if the given string matches any of the JPA reserved words in a case-insensitive manner.
*/
public static boolean isKeyword(String name) {
return name != null && KEYWORDS.contains(name.toUpperCase(Locale.ENGLISH));
}
/**
* Returns the special character contained in the given name if any.
*
* @return null if no character in the given name is a special character.
*/
public static Character hasSpecialCharacter(String name) {
if (name == null)
return null;
char[] chars = name.toCharArray();
if (!Character.isJavaIdentifierStart(chars[0]))
return chars[0];
for (int i = 1; i < chars.length; i++) {
if (!Character.isJavaIdentifierPart(chars[i]))
return chars[i];
}
return null;
}
}