001 /**
002 * Copyright 2006-2011 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package org.codehaus.mojo.sql;
017
018 import org.codehaus.plexus.util.StringUtils;
019
020 /**
021 * Utility class to split a long sql batch script into single SQL commands.
022 */
023 public class SqlSplitter {
024 /**
025 * Value indicating the sql has no end-delimiter like i.e. semicolon
026 */
027 public static final int NO_END = -1;
028
029 /**
030 * Check if the given sql line contains an end of command ';' Please note
031 * that we do <em>not</em> fully parse the SQL, so if we get a malformed
032 * statement, we cannot detect it.
033 *
034 * @param line
035 * to parse
036 * @param delimiter
037 * which should be used to split SQL commands
038 * @return position after the end character if the given line contains the
039 * end of a SQL script, {@value SqlSplitter#NO_END} if it doesn't
040 * contain an end char.
041 */
042 public static int containsSqlEnd(String line, String delimiter) {
043 // / * * / comments
044 boolean isComment = false;
045
046 boolean isAlphaDelimiter = StringUtils.isAlpha(delimiter);
047
048 if (line == null || line.length() == 0) {
049 return NO_END;
050 }
051
052 int pos = 0;
053
054 do {
055 if (isComment) {
056 if (line.startsWith("*/", pos)) {
057 isComment = false;
058 } else {
059 pos++;
060 continue;
061 }
062 }
063
064 if (line.startsWith("/*", pos)) {
065 isComment = true;
066 pos += 2;
067 continue;
068 }
069
070 if (line.startsWith("--", pos)) {
071 return NO_END;
072 }
073
074 if (line.startsWith("'", pos) || line.startsWith("\"", pos)) {
075 String quoteChar = "" + line.charAt(pos);
076 String quoteEscape = "\\" + quoteChar;
077 pos++;
078
079 if (line.length() <= pos) {
080 return NO_END;
081 }
082
083 do {
084 if (line.startsWith(quoteEscape, pos)) {
085 pos += 2;
086 }
087 } while (!line.startsWith(quoteChar, pos++));
088
089 continue;
090 }
091
092 if (line.startsWith(delimiter, pos)) {
093 if (isAlphaDelimiter) {
094 // check if delimiter is at start or end of line, surrounded
095 // by non-alpha character
096 if ((pos == 0 || !isAlpha(line.charAt(pos - 1)))
097 && (line.length() == pos + delimiter.length() || !isAlpha(line
098 .charAt(pos + delimiter.length())))) {
099 return pos + delimiter.length();
100 }
101 } else {
102 return pos + delimiter.length();
103 }
104 }
105
106 pos++;
107
108 } while (line.length() >= pos);
109
110 return NO_END;
111 }
112
113 /**
114 * @param c
115 * the char to check
116 * @return <code>true</code> if the given character is either a lower or an
117 * upperchase alphanumerical character
118 */
119 private static boolean isAlpha(char c) {
120 return Character.isUpperCase(c) || Character.isLowerCase(c);
121 }
122
123 }