package liquibase.sqlgenerator.core;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import liquibase.change.AddColumnConfig;
import liquibase.database.Database;
import liquibase.database.core.DB2Database;
import liquibase.database.core.InformixDatabase;
import liquibase.database.core.MSSQLDatabase;
import liquibase.database.core.PostgresDatabase;
import liquibase.database.core.SybaseASADatabase;
import liquibase.structure.core.Index;
import liquibase.sql.Sql;
import liquibase.sql.UnparsedSql;
import liquibase.sqlgenerator.SqlGeneratorChain;
import liquibase.statement.core.CreateIndexStatement;
import liquibase.util.StringUtils;
public class CreateIndexGeneratorPostgres extends CreateIndexGenerator {
@Override
public int getPriority() {
return PRIORITY_DATABASE;
}
@Override
public boolean supports(CreateIndexStatement statement, Database database) {
return database instanceof PostgresDatabase;
}
@Override
public Sql[] generateSql(CreateIndexStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
// Default filter of index creation:
// creation of all indexes with associations are switched off.
List<String> associatedWith = StringUtils.splitAndTrim(statement.getAssociatedWith(), ",");
if (associatedWith != null && (associatedWith.contains(Index.MARK_PRIMARY_KEY) ||
associatedWith.contains(Index.MARK_UNIQUE_CONSTRAINT) ||
associatedWith.contains(Index.MARK_FOREIGN_KEY))) {
return new Sql[0];
}
StringBuilder buffer = new StringBuilder();
buffer.append("CREATE ");
if (statement.isUnique() != null && statement.isUnique()) {
buffer.append("UNIQUE ");
}
buffer.append("INDEX ");
if (statement.getIndexName() != null) {
// for postgres setting the schema name for the index name is invalid
buffer.append(database.escapeObjectName(statement.getIndexName(), Index.class)).append(" ");
}
buffer.append("ON ");
buffer.append(database.escapeTableName(statement.getTableCatalogName(), statement.getTableSchemaName(), statement.getTableName())).append("(");
Iterator<AddColumnConfig> iterator = Arrays.asList(statement.getColumns()).iterator();
while (iterator.hasNext()) {
AddColumnConfig column = iterator.next();
if (column.getComputed() != null && column.getComputed()) {
buffer.append(column.getName());
} else {
buffer.append(database.escapeColumnName(statement.getTableCatalogName(), statement.getTableSchemaName(), statement.getTableName(), column.getName()));
}
if (iterator.hasNext()) {
buffer.append(", ");
}
}
buffer.append(")");
if (StringUtils.trimToNull(statement.getTablespace()) != null && database.supportsTablespaces()) {
if (database instanceof MSSQLDatabase || database instanceof SybaseASADatabase) {
buffer.append(" ON ").append(statement.getTablespace());
} else if (database instanceof DB2Database || database instanceof InformixDatabase) {
buffer.append(" IN ").append(statement.getTablespace());
} else {
buffer.append(" TABLESPACE ").append(statement.getTablespace());
}
}
if (statement.isClustered() != null && statement.isClustered()) {
return new Sql[]{
new UnparsedSql(buffer.toString(), getAffectedIndex(statement)),
new UnparsedSql("CLUSTER " + database.escapeTableName(statement.getTableCatalogName(), statement.getTableSchemaName(), statement.getTableName()) + " USING " + database.escapeObjectName(statement.getIndexName(), Index.class))
};
} else {
return new Sql[]{new UnparsedSql(buffer.toString(), getAffectedIndex(statement))};
}
}
}