| /* |
| * 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.criteria; |
| |
| import java.io.IOException; |
| import java.io.StreamTokenizer; |
| import java.io.StringReader; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| /** |
| * Compares a pair of String ignoring case-sensitivity of set of reserved words. |
| * |
| */ |
| public class StringComparison { |
| private static List<String> _reserved = Arrays.asList(new String[] { |
| "ALL", "AND", "ANY", "AS", "ASC", "AVG", |
| "BETWEEN", "BIT_LENGTH", "BY", |
| "CASE", "CHAR_LENGTH", "CHARACTER_LENGTH", "CLASS", "COALESCE", |
| "COUNT","CURRENT_DATE", "CURRENT_TIME", "CURRENT_TIMESTAMP", |
| "DELETE", "DESC", "DISTINCT", |
| "EMPTY", "ENTRY", "EXISTS", |
| "FALSE", "FETCH", "FROM", |
| "GROUP", |
| "HAVING", |
| "IN", "INDEX", "INNER", "IS", |
| "JOIN", |
| "KEY", |
| "LEFT", "LIKE", "LOWER", |
| "MAX", "MEMBER", "MIN", "MOD", |
| "NEW", "NOT", "NULL", "NULLIF", |
| "OBJECT", "OF", "OR", "ORDER", "OUTER", |
| "POSITION", |
| "SELECT", "SOME", "SUM", |
| "THEN", "TRIM", "TRUE", "TYPE", |
| "UNKNOWN", "UPDATE", "UPPER", |
| "VALUE", |
| "WHEN", "WHERE", |
| }); |
| |
| private boolean isReservedWord(String s) { |
| return _reserved.contains(s.toUpperCase()); |
| } |
| |
| public List<String> tokenize(String s) throws IOException { |
| List<String> list = new ArrayList<>(); |
| StreamTokenizer tok = new StreamTokenizer(new StringReader(s)); |
| tok.resetSyntax(); |
| tok.wordChars('a', 'z'); |
| tok.wordChars('0', '9'); |
| tok.wordChars('A', 'Z'); |
| tok.wordChars('\'', '\''); |
| tok.wordChars('=', '='); |
| tok.wordChars('>', '>'); |
| tok.wordChars('<', '<'); |
| tok.wordChars('!', '!'); |
| tok.wordChars('.', '.'); |
| for (int ttype; (ttype = tok.nextToken()) != StreamTokenizer.TT_EOF;) { |
| if (ttype == StreamTokenizer.TT_WORD) |
| list.add(tok.sval); |
| } |
| return list; |
| } |
| |
| public boolean compare(String s1, String s2) { |
| try { |
| List<String> list1 = tokenize(s1); |
| List<String> list2 = tokenize(s2); |
| if (list1.size() != list2.size()) { |
| System.err.println("Unequal tokens " + list1.size() + "!=" |
| + list2.size()); |
| return false; |
| } |
| for (int i = 0; i < list1.size(); i++) { |
| String a = list1.get(i); |
| String b = list2.get(i); |
| boolean match = |
| isReservedWord(a) ? a.equalsIgnoreCase(b) : a.equals(b); |
| if (!match) { |
| System.err.println("[" + a + "] does not match [" + b |
| + "]"); |
| return false; |
| } |
| } |
| return true; |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| return false; |
| } |
| |
| public static void main(String[] args) throws Exception { |
| StringComparison c = new StringComparison(); |
| String s1 = "SELECT DISTINCT o FROM Order AS o JOIN o.lineItems AS l " |
| + "WHERE l.shipped != FALSE and l.name like 'hello'"; |
| String s2 = "select DISTINCT o FROM Order AS o JOIN o.lineItems AS l " |
| + "WHERE l.shipped != FALSE and l.name like 'hello'"; |
| boolean match = c.compare(s1, s2); |
| if (!match) { |
| System.err.println(s1); |
| System.err.println(c.tokenize(s1)); |
| System.err.println(s2); |
| System.err.println(c.tokenize(s2)); |
| } |
| } |
| |
| } |