| /* |
| * 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.drill.test.rowSet.file; |
| |
| import java.io.BufferedOutputStream; |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| |
| import org.apache.drill.exec.physical.resultSet.util.JsonWriter; |
| import org.apache.drill.exec.physical.rowSet.RowSet; |
| import org.apache.drill.exec.physical.rowSet.RowSetReader; |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| |
| /** |
| * <h4>Overview</h4> |
| * <p> |
| * Builds a JSON file containing the data in a {@link RowSet}. |
| * </p> |
| * <h4>Example</h4> |
| * <p> |
| * You can find an example of how to use {@link JsonFileBuilder} at |
| * {@link org.apache.drill.test.ExampleTest#secondTest()}. |
| * </p> |
| */ |
| public class JsonFileBuilder { |
| |
| private final RowSet rowSet; |
| private boolean pretty = true; |
| private boolean useExtendedOutput; |
| |
| /** |
| * Creates a {@link JsonFileBuilder} that will write the given {@link RowSet} to a file. |
| * |
| * @param rowSet The {@link RowSet} to be written to a file. |
| */ |
| public JsonFileBuilder(RowSet rowSet) { |
| this.rowSet = Preconditions.checkNotNull(rowSet); |
| Preconditions.checkArgument(rowSet.rowCount() > 0, "The given rowset is empty."); |
| } |
| |
| public JsonFileBuilder prettyPrint(boolean flag) { |
| this.pretty = flag; |
| return this; |
| } |
| |
| public JsonFileBuilder extended(boolean flag) { |
| this.useExtendedOutput = flag; |
| return this; |
| } |
| |
| /** |
| * Writes the configured data to the given file in json format. |
| * @param tableFile The file to write the json data to. |
| * @throws IOException |
| */ |
| public void build(File tableFile) throws IOException { |
| tableFile.getParentFile().mkdirs(); |
| |
| try (BufferedOutputStream os = new BufferedOutputStream(new FileOutputStream(tableFile))) { |
| JsonWriter jsonWriter = new JsonWriter(os, pretty, useExtendedOutput); |
| final RowSetReader reader = rowSet.reader(); |
| while (reader.next()) { |
| jsonWriter.writeRow(reader); |
| } |
| } |
| } |
| } |