001 /* 002 * Sonar, open source software quality management tool. 003 * Copyright (C) 2009 SonarSource SA 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 instanciate 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 }