| /* |
| * 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.ignite.internal.processors.odbc.jdbc; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import org.apache.ignite.internal.binary.BinaryReaderExImpl; |
| import org.apache.ignite.internal.binary.BinaryWriterExImpl; |
| import org.apache.ignite.internal.processors.odbc.SqlListenerUtils; |
| |
| /** |
| * Various JDBC utility methods. |
| */ |
| public class JdbcUtils { |
| /** |
| * @param writer Binary writer. |
| * @param items Query results items. |
| */ |
| public static void writeItems(BinaryWriterExImpl writer, List<List<Object>> items) { |
| writer.writeInt(items.size()); |
| |
| for (List<Object> row : items) { |
| if (row != null) { |
| writer.writeInt(row.size()); |
| |
| for (Object obj : row) |
| SqlListenerUtils.writeObject(writer, obj, false); |
| } |
| } |
| } |
| |
| /** |
| * @param reader Binary reader. |
| * @return Query results items. |
| */ |
| public static List<List<Object>> readItems(BinaryReaderExImpl reader) { |
| int rowsSize = reader.readInt(); |
| |
| if (rowsSize > 0) { |
| List<List<Object>> items = new ArrayList<>(rowsSize); |
| |
| for (int i = 0; i < rowsSize; ++i) { |
| int colsSize = reader.readInt(); |
| |
| List<Object> col = new ArrayList<>(colsSize); |
| |
| for (int colCnt = 0; colCnt < colsSize; ++colCnt) |
| col.add(SqlListenerUtils.readObject(reader, false)); |
| |
| items.add(col); |
| } |
| |
| return items; |
| } else |
| return Collections.emptyList(); |
| } |
| |
| /** |
| * @param writer Binary writer. |
| * @param lst List to write. |
| */ |
| public static void writeStringCollection(BinaryWriterExImpl writer, Collection<String> lst) { |
| if (lst == null) |
| writer.writeInt(0); |
| else { |
| writer.writeInt(lst.size()); |
| |
| for (String s : lst) |
| writer.writeString(s); |
| } |
| } |
| |
| /** |
| * @param reader Binary reader. |
| * @return List of string. |
| */ |
| public static List<String> readStringList(BinaryReaderExImpl reader) { |
| int size = reader.readInt(); |
| |
| if (size > 0) { |
| List<String> lst = new ArrayList<>(size); |
| |
| for (int i = 0; i < size; ++i) |
| lst.add(reader.readString()); |
| |
| return lst; |
| } |
| else |
| return Collections.emptyList(); |
| } |
| } |