001 /*
002 * Sonar, open source software quality management tool.
003 * Copyright (C) 2008-2011 SonarSource
004 * mailto:contact AT sonarsource DOT com
005 *
006 * Sonar is free software; you can redistribute it and/or
007 * modify it under the terms of the GNU Lesser General Public
008 * License as published by the Free Software Foundation; either
009 * version 3 of the License, or (at your option) any later version.
010 *
011 * Sonar is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 * Lesser General Public License for more details.
015 *
016 * You should have received a copy of the GNU Lesser General Public
017 * License along with Sonar; if not, write to the Free Software
018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02
019 */
020 package org.sonar.jpa.dialect;
021
022 import com.google.common.base.Predicate;
023 import com.google.common.collect.Iterators;
024 import org.apache.commons.lang.StringUtils;
025 import org.sonar.api.utils.SonarException;
026
027 import java.util.Arrays;
028 import java.util.Collection;
029 import java.util.List;
030 import java.util.NoSuchElementException;
031
032 /**
033 * @since 1.12
034 */
035 public final class DialectRepository {
036
037 private DialectRepository() {
038 }
039
040 private static List<Dialect> builtInDialects = getSupportedDialects();
041
042 public static Dialect find(final String dialectId, final String jdbcConnectionUrl) {
043 Dialect match = StringUtils.isNotEmpty(dialectId) ? findById(dialectId) : findByJdbcUrl(jdbcConnectionUrl);
044 if (match == null) {
045 throw new SonarException("Unable to determine database dialect to use within sonar with dialect " + dialectId + " jdbc url " + jdbcConnectionUrl);
046 }
047 return match;
048 }
049
050 private static Dialect findByJdbcUrl(final String jdbcConnectionUrl) {
051 Dialect match = findDialect(builtInDialects, new Predicate<Dialect>() {
052 public boolean apply(Dialect dialect) {
053 return dialect.matchesJdbcURL(StringUtils.trimToEmpty(jdbcConnectionUrl));
054 }
055 });
056 return match;
057 }
058
059 private static Dialect findById(final String dialectId) {
060 Dialect match = findDialect(builtInDialects, new Predicate<Dialect>() {
061 public boolean apply(Dialect dialect) {
062 return dialect.getId().equals(dialectId);
063 }
064 });
065 // maybe a class name if no match
066 match = match == null ? getDialectByClassname(dialectId) : match;
067 return match;
068 }
069
070 private static Dialect findDialect(Collection<Dialect> dialects, Predicate<Dialect> predicate) {
071 try {
072 return Iterators.find(dialects.iterator(), predicate);
073 } catch (NoSuchElementException ex) {
074 return null;
075 }
076 }
077
078 private static Dialect getDialectByClassname(String dialectId) {
079 try {
080 Class<? extends Dialect> dialectClass = (Class<? extends Dialect>) DialectRepository.class.getClassLoader().loadClass(dialectId);
081 return dialectClass.newInstance();
082 } catch (ClassNotFoundException e) {
083 // dialectId was not a class name :)
084 } catch (Exception e) {
085 throw new SonarException("Unable to instantiate dialect class", e);
086 }
087 return null;
088 }
089
090 private static List<Dialect> getSupportedDialects() {
091 return Arrays.asList(new Derby(), new HsqlDb(), new MySql(), new Oracle(), new PostgreSql(), new MsSql());
092 }
093 }