001package ca.uhn.fhir.jpa.migrate.taskdef;
002
003/*-
004 * #%L
005 * HAPI FHIR Server - SQL Migration
006 * %%
007 * Copyright (C) 2014 - 2022 Smile CDR, Inc.
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import ca.uhn.fhir.i18n.Msg;
024import ca.uhn.fhir.jpa.migrate.JdbcUtils;
025import org.apache.commons.lang3.Validate;
026import org.apache.commons.lang3.builder.EqualsBuilder;
027import org.apache.commons.lang3.builder.HashCodeBuilder;
028import org.slf4j.Logger;
029import org.slf4j.LoggerFactory;
030
031import java.sql.SQLException;
032import java.util.Set;
033import java.util.stream.Collectors;
034
035import static org.apache.commons.lang3.StringUtils.isNotBlank;
036
037public class DropIdGeneratorTask extends BaseTask {
038
039        private static final Logger ourLog = LoggerFactory.getLogger(DropIdGeneratorTask.class);
040        private final String myGeneratorName;
041
042        public DropIdGeneratorTask(String theProductVersion, String theSchemaVersion, String theGeneratorName) {
043                super(theProductVersion, theSchemaVersion);
044                myGeneratorName = theGeneratorName;
045        }
046
047        @Override
048        public void validate() {
049                Validate.notBlank(myGeneratorName);
050                setDescription("Drop id generator " + myGeneratorName);
051        }
052
053        @Override
054        public void doExecute() throws SQLException {
055                Set<String> tableNames = JdbcUtils.getTableNames(getConnectionProperties());
056                String sql = null;
057
058                switch (getDriverType()) {
059                        case MARIADB_10_1:
060                        case MYSQL_5_7:
061                                // These require a separate table
062                                if (tableNames.contains(myGeneratorName)) {
063
064                                        String initSql = "delete from " + myGeneratorName;
065                                        executeSql(myGeneratorName, initSql);
066
067                                        String creationSql = "drop table " + myGeneratorName;
068                                        executeSql(myGeneratorName, creationSql);
069
070                                }
071                                break;
072                        case DERBY_EMBEDDED:
073                                sql = "drop sequence " + myGeneratorName + " restrict";
074                                break;
075                        case H2_EMBEDDED:
076                                sql = "drop sequence " + myGeneratorName;
077                                break;
078                        case POSTGRES_9_4:
079                                sql = "drop sequence " + myGeneratorName;
080                                break;
081                        case ORACLE_12C:
082                                sql = "drop sequence " + myGeneratorName;
083                                break;
084                        case MSSQL_2012:
085                                sql = "drop sequence " + myGeneratorName;
086                                break;
087                        default:
088                                throw new IllegalStateException(Msg.code(64));
089                }
090
091                if (isNotBlank(sql)) {
092                        Set<String> sequenceNames =
093                                JdbcUtils.getSequenceNames(getConnectionProperties())
094                                        .stream()
095                                        .map(String::toLowerCase)
096                                        .collect(Collectors.toSet());
097                        ourLog.debug("Currently have sequences: {}", sequenceNames);
098                        if (!sequenceNames.contains(myGeneratorName.toLowerCase())) {
099                                logInfo(ourLog, "Sequence {} does not exist - No action performed", myGeneratorName);
100                                return;
101                        }
102
103                        executeSql(myGeneratorName, sql);
104                }
105
106        }
107
108        @Override
109        protected void generateEquals(EqualsBuilder theBuilder, BaseTask theOtherObject) {
110                DropIdGeneratorTask otherObject = (DropIdGeneratorTask) theOtherObject;
111                theBuilder.append(myGeneratorName, otherObject.myGeneratorName);
112        }
113
114        @Override
115        protected void generateHashCode(HashCodeBuilder theBuilder) {
116                theBuilder.append(myGeneratorName);
117        }
118}