| /* |
| * 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.cassandra.distributed.impl; |
| |
| import java.nio.ByteBuffer; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import com.google.common.collect.Iterators; |
| import com.google.common.collect.Lists; |
| |
| import com.datastax.driver.core.ResultSet; |
| import com.datastax.driver.core.Row; |
| import org.apache.cassandra.cql3.ColumnSpecification; |
| import org.apache.cassandra.cql3.UntypedResultSet; |
| import org.apache.cassandra.distributed.api.QueryResults; |
| import org.apache.cassandra.distributed.api.SimpleQueryResult; |
| import org.apache.cassandra.transport.messages.ResultMessage; |
| |
| public class RowUtil |
| { |
| public static SimpleQueryResult toQueryResult(ResultMessage res) |
| { |
| if (res != null && res.kind == ResultMessage.Kind.ROWS) |
| { |
| ResultMessage.Rows rows = (ResultMessage.Rows) res; |
| String[] names = getColumnNames(rows.result.metadata.names); |
| Object[][] results = RowUtil.toObjects(rows); |
| |
| // Warnings may be null here, due to ClientWarn#getWarnings() handling of empty warning lists. |
| List<String> warnings = res.getWarnings(); |
| |
| return new SimpleQueryResult(names, results, warnings == null ? Collections.emptyList() : warnings); |
| } |
| else |
| { |
| return QueryResults.empty(); |
| } |
| } |
| |
| public static String[] getColumnNames(List<ColumnSpecification> names) |
| { |
| return names.stream().map(c -> c.name.toString()).toArray(String[]::new); |
| } |
| |
| public static Object[][] toObjects(ResultMessage.Rows rows) |
| { |
| return toObjects(rows.result.metadata.names, rows.result.rows); |
| } |
| |
| public static Iterator<Object[]> toObjects(ResultSet rs) |
| { |
| return Iterators.transform(rs.iterator(), (Row row) -> { |
| final int numColumns = rs.getColumnDefinitions().size(); |
| Object[] objectRow = new Object[numColumns]; |
| for (int i = 0; i < numColumns; i++) |
| { |
| objectRow[i] = row.getObject(i); |
| } |
| return objectRow; |
| }); |
| } |
| |
| public static Object[][] toObjects(List<ColumnSpecification> specs, List<List<ByteBuffer>> rows) |
| { |
| Object[][] result = new Object[rows.size()][]; |
| for (int i = 0; i < rows.size(); i++) |
| { |
| List<ByteBuffer> row = rows.get(i); |
| result[i] = new Object[row.size()]; |
| for (int j = 0; j < row.size(); j++) |
| { |
| ByteBuffer bb = row.get(j); |
| |
| if (bb != null) |
| result[i][j] = specs.get(j).type.getSerializer().deserialize(bb); |
| } |
| } |
| return result; |
| } |
| |
| public static Iterator<Object[]> toIter(UntypedResultSet rs) |
| { |
| return toIter(rs.metadata(), rs.iterator()); |
| } |
| |
| public static Iterator<Object[]> toIter(ResultMessage.Rows rows) |
| { |
| return toIterInternal(rows.result.metadata.names, rows.result.rows); |
| } |
| |
| public static Iterator<Object[]> toIter(List<ColumnSpecification> columnSpecs, Iterator<UntypedResultSet.Row> rs) |
| { |
| Iterator<List<ByteBuffer>> iter = Iterators.transform(rs, |
| (row) -> { |
| List<ByteBuffer> bbs = new ArrayList<>(columnSpecs.size()); |
| for (int i = 0; i < columnSpecs.size(); i++) |
| { |
| ColumnSpecification columnSpec = columnSpecs.get(i); |
| bbs.add(row.getBytes(columnSpec.name.toString())); |
| } |
| return bbs; |
| }); |
| return toIterInternal(columnSpecs, Lists.newArrayList(iter)); |
| } |
| |
| private static Iterator<Object[]> toIterInternal(List<ColumnSpecification> columnSpecs, List<List<ByteBuffer>> rs) |
| { |
| return Iterators.transform(rs.iterator(), |
| (row) -> { |
| Object[] objectRow = new Object[columnSpecs.size()]; |
| for (int i = 0; i < columnSpecs.size(); i++) |
| { |
| ColumnSpecification columnSpec = columnSpecs.get(i); |
| ByteBuffer bb = row.get(i); |
| |
| if (bb != null) |
| objectRow[i] = columnSpec.type.getSerializer().deserialize(bb); |
| |
| } |
| return objectRow; |
| }); |
| } |
| } |