| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to you under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.calcite.jdbc; |
| |
| import org.apache.calcite.avatica.AvaticaResultSet; |
| import org.apache.calcite.avatica.AvaticaResultSetMetaData; |
| import org.apache.calcite.avatica.AvaticaStatement; |
| import org.apache.calcite.avatica.ColumnMetaData; |
| import org.apache.calcite.avatica.Handler; |
| import org.apache.calcite.avatica.Meta; |
| import org.apache.calcite.avatica.NoSuchStatementException; |
| import org.apache.calcite.avatica.util.Cursor; |
| import org.apache.calcite.linq4j.Enumerator; |
| import org.apache.calcite.linq4j.Linq4j; |
| import org.apache.calcite.rel.RelCollation; |
| import org.apache.calcite.runtime.ArrayEnumeratorCursor; |
| import org.apache.calcite.runtime.ObjectEnumeratorCursor; |
| |
| import com.google.common.base.Throwables; |
| import com.google.common.collect.ImmutableList; |
| |
| import java.sql.ResultSet; |
| import java.sql.ResultSetMetaData; |
| import java.sql.SQLException; |
| import java.util.List; |
| import java.util.TimeZone; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import static org.apache.calcite.util.Static.RESOURCE; |
| |
| /** |
| * Implementation of {@link ResultSet} |
| * for the Calcite engine. |
| */ |
| public class CalciteResultSet extends AvaticaResultSet { |
| private final AtomicBoolean cancelFlag; |
| |
| CalciteResultSet(AvaticaStatement statement, |
| CalcitePrepare.CalciteSignature calciteSignature, |
| ResultSetMetaData resultSetMetaData, TimeZone timeZone, |
| Meta.Frame firstFrame) { |
| super(statement, null, calciteSignature, resultSetMetaData, timeZone, firstFrame); |
| try { |
| cancelFlag = getCalciteConnection().getCancelFlag(statement.handle); |
| } catch (NoSuchStatementException e) { |
| throw Throwables.propagate(e); |
| } |
| } |
| |
| @Override protected CalciteResultSet execute() throws SQLException { |
| // Call driver's callback. It is permitted to throw a RuntimeException. |
| CalciteConnectionImpl connection = getCalciteConnection(); |
| final boolean autoTemp = connection.config().autoTemp(); |
| Handler.ResultSink resultSink = null; |
| if (autoTemp) { |
| resultSink = new Handler.ResultSink() { |
| public void toBeCompleted() { |
| } |
| }; |
| } |
| connection.getDriver().handler.onStatementExecute(statement, resultSink); |
| |
| super.execute(); |
| return this; |
| } |
| |
| @Override protected void cancel() { |
| cancelFlag.compareAndSet(false, true); |
| } |
| |
| @Override public boolean next() throws SQLException { |
| final boolean next = super.next(); |
| if (cancelFlag.get()) { |
| throw new SQLException(RESOURCE.statementCanceled().str()); |
| } |
| return next; |
| } |
| |
| @Override public ResultSet create(ColumnMetaData.AvaticaType elementType, |
| Iterable<Object> iterable) { |
| final List<ColumnMetaData> columnMetaDataList; |
| if (elementType instanceof ColumnMetaData.StructType) { |
| columnMetaDataList = ((ColumnMetaData.StructType) elementType).columns; |
| } else { |
| columnMetaDataList = |
| ImmutableList.of(ColumnMetaData.dummy(elementType, false)); |
| } |
| final CalcitePrepare.CalciteSignature signature = |
| (CalcitePrepare.CalciteSignature) this.signature; |
| final CalcitePrepare.CalciteSignature<Object> newSignature = |
| new CalcitePrepare.CalciteSignature<>(signature.sql, |
| signature.parameters, signature.internalParameters, |
| signature.rowType, columnMetaDataList, Meta.CursorFactory.ARRAY, |
| ImmutableList.<RelCollation>of(), -1, null); |
| ResultSetMetaData subResultSetMetaData = |
| new AvaticaResultSetMetaData(statement, null, newSignature); |
| final CalciteResultSet resultSet = |
| new CalciteResultSet(statement, signature, subResultSetMetaData, |
| localCalendar.getTimeZone(), new Meta.Frame(0, true, iterable)); |
| final Cursor cursor = resultSet.createCursor(elementType, iterable); |
| return resultSet.execute2(cursor, columnMetaDataList); |
| } |
| |
| private Cursor createCursor(ColumnMetaData.AvaticaType elementType, |
| Iterable iterable) { |
| final Enumerator enumerator = Linq4j.iterableEnumerator(iterable); |
| //noinspection unchecked |
| return !(elementType instanceof ColumnMetaData.StructType) |
| || ((ColumnMetaData.StructType) elementType).columns.size() == 1 |
| ? new ObjectEnumeratorCursor(enumerator) |
| : new ArrayEnumeratorCursor(enumerator); |
| } |
| |
| // do not make public |
| <T> CalcitePrepare.CalciteSignature<T> getSignature() { |
| //noinspection unchecked |
| return (CalcitePrepare.CalciteSignature) signature; |
| } |
| |
| // do not make public |
| CalciteConnectionImpl getCalciteConnection() { |
| return (CalciteConnectionImpl) statement.getConnection(); |
| } |
| } |
| |
| // End CalciteResultSet.java |