001package ca.uhn.fhir.jpa.migrate.taskdef;
002
003/*-
004 * #%L
005 * HAPI FHIR Server - SQL Migration
006 * %%
007 * Copyright (C) 2014 - 2021 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.jpa.migrate.JdbcUtils;
024import org.apache.commons.lang3.Validate;
025import org.apache.commons.lang3.builder.EqualsBuilder;
026import org.apache.commons.lang3.builder.HashCodeBuilder;
027import org.slf4j.Logger;
028import org.slf4j.LoggerFactory;
029
030import java.sql.SQLException;
031import java.util.Set;
032import java.util.stream.Collectors;
033
034import static org.apache.commons.lang3.StringUtils.isNotBlank;
035
036public class DropIdGeneratorTask extends BaseTask {
037
038        private static final Logger ourLog = LoggerFactory.getLogger(DropIdGeneratorTask.class);
039        private final String myGeneratorName;
040
041        public DropIdGeneratorTask(String theProductVersion, String theSchemaVersion, String theGeneratorName) {
042                super(theProductVersion, theSchemaVersion);
043                myGeneratorName = theGeneratorName;
044        }
045
046        @Override
047        public void validate() {
048                Validate.notBlank(myGeneratorName);
049                setDescription("Drop id generator " + myGeneratorName);
050        }
051
052        @Override
053        public void doExecute() throws SQLException {
054                Set<String> tableNames = JdbcUtils.getTableNames(getConnectionProperties());
055                String sql = null;
056
057                switch (getDriverType()) {
058                        case MARIADB_10_1:
059                        case MYSQL_5_7:
060                                // These require a separate table
061                                if (tableNames.contains(myGeneratorName)) {
062
063                                        String initSql = "delete from " + myGeneratorName;
064                                        executeSql(myGeneratorName, initSql);
065
066                                        String creationSql = "drop table " + myGeneratorName;
067                                        executeSql(myGeneratorName, creationSql);
068
069                                }
070                                break;
071                        case DERBY_EMBEDDED:
072                                sql = "drop sequence " + myGeneratorName + " restrict";
073                                break;
074                        case H2_EMBEDDED:
075                                sql = "drop sequence " + myGeneratorName;
076                                break;
077                        case POSTGRES_9_4:
078                                sql = "drop sequence " + myGeneratorName;
079                                break;
080                        case ORACLE_12C:
081                                sql = "drop sequence " + myGeneratorName;
082                                break;
083                        case MSSQL_2012:
084                                sql = "drop sequence " + myGeneratorName;
085                                break;
086                        default:
087                                throw new IllegalStateException();
088                }
089
090                if (isNotBlank(sql)) {
091                        Set<String> sequenceNames =
092                                JdbcUtils.getSequenceNames(getConnectionProperties())
093                                        .stream()
094                                        .map(String::toLowerCase)
095                                        .collect(Collectors.toSet());
096                        ourLog.debug("Currently have sequences: {}", sequenceNames);
097                        if (!sequenceNames.contains(myGeneratorName.toLowerCase())) {
098                                logInfo(ourLog, "Sequence {} does not exist - No action performed", myGeneratorName);
099                                return;
100                        }
101
102                        executeSql(myGeneratorName, sql);
103                }
104
105        }
106
107        @Override
108        protected void generateEquals(EqualsBuilder theBuilder, BaseTask theOtherObject) {
109                DropIdGeneratorTask otherObject = (DropIdGeneratorTask) theOtherObject;
110                theBuilder.append(myGeneratorName, otherObject.myGeneratorName);
111        }
112
113        @Override
114        protected void generateHashCode(HashCodeBuilder theBuilder) {
115                theBuilder.append(myGeneratorName);
116        }
117}