content: /*
   * 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
   *
   *     https://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.avro.tool;
  
  import static java.util.Arrays.asList;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.PrintStream;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  import org.apache.avro.Schema;
  import org.apache.avro.Schema.Type;
  import org.apache.avro.file.CodecFactory;
  import org.apache.avro.file.DataFileConstants;
  import org.apache.avro.file.DataFileStream;
  import org.apache.avro.file.DataFileWriter;
  import org.apache.avro.generic.GenericDatumReader;
  import org.apache.avro.generic.GenericDatumWriter;
  import org.apache.avro.generic.GenericRecord;
  import org.apache.avro.util.Utf8;
  import org.junit.Rule;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.io.TempDir;
  import org.junit.rules.TestName;
  
  public class TestConcatTool {
    private static final int ROWS_IN_INPUT_FILES = 100000;
    private static final CodecFactory DEFLATE = CodecFactory.deflateCodec(9);
  
    @Rule
    public TestName name = new TestName();
  
    @TempDir
    public File INPUT_DIR;
  
    @TempDir
    public File OUTPUT_DIR;
  
    private Object aDatum(Type ofType, int forRow) {
      switch (ofType) {
      case STRING:
        return String.valueOf(forRow % 100);
      case INT:
        return forRow;
      default:
        throw new AssertionError("I can't generate data for this type");
      }
    }
  
    private File generateData(String file, Type type, Map<String, String> metadata, CodecFactory codec) throws Exception {
      File inputFile = new File(INPUT_DIR, file);
      Schema schema = Schema.create(type);
      try (DataFileWriter<Object> writer = new DataFileWriter<>(new GenericDatumWriter<>(schema))) {
        for (Entry<String, String> metadatum : metadata.entrySet()) {
          writer.setMeta(metadatum.getKey(), metadatum.getValue());
        }
        writer.setCodec(codec);
        writer.create(schema, inputFile);
  
        for (int i = 0; i < ROWS_IN_INPUT_FILES; i++) {
          writer.append(aDatum(type, i));
        }
      }
      return inputFile;
    }
  
    private CodecFactory getCodec(File output) throws Exception {
      try (DataFileStream<GenericRecord> reader = new DataFileStream<>(new FileInputStream(output),
          new GenericDatumReader<>())) {
        String codec = reader.getMetaString(DataFileConstants.CODEC);
  
        return codec == null ? CodecFactory.nullCodec() : CodecFactory.fromString(codec);
      }
    }
  
    private int numRowsInFile(File output) throws Exception {
      int rowcount = 0;
      try (DataFileStream<Utf8> reader = new DataFileStream<>(new FileInputStream(output), new GenericDatumReader<>())) {
        for (Utf8 ignored : reader) {
          ++rowcount;
        }
      }
      return rowcount;
    }
  
    @Test
    void dirConcat() throws Exception {
      Map<String, String> metadata = new HashMap<>();
  
      for (int i = 0; i < 3; i++) {
        generateData(name.getMethodName() + "-" + i + ".avro", Type.STRING, metadata, DEFLATE);
      }
  
      File output = new File(OUTPUT_DIR, name.getMethodName() + ".avro");
  
      List<String> args = asList(INPUT_DIR.getAbsolutePath(), output.getAbsolutePath());
      int returnCode = new ConcatTool().run(System.in, System.out, System.err, args);
  
      assertEquals(0, returnCode);
      assertEquals(ROWS_IN_INPUT_FILES * 3, numRowsInFile(output));
    }
  
    @Test
    void globPatternConcat() throws Exception {
      Map<String, String> metadata = new HashMap<>();
  
      for (int i = 0; i < 3; i++) {
        generateData(name.getMethodName() + "-" + i + ".avro", Type.STRING, metadata, DEFLATE);
      }
  
      File output = new File(OUTPUT_DIR, name.getMethodName() + ".avro");
  
      List<String> args = asList(new File(INPUT_DIR, "/*").getAbsolutePath(), output.getAbsolutePath());
      int returnCode = new ConcatTool().run(System.in, System.out, System.err, args);
  
      assertEquals(0, returnCode);
      assertEquals(ROWS_IN_INPUT_FILES * 3, numRowsInFile(output));
    }
  
    @Test
    void fileDoesNotExist() throws Exception {
      assertThrows(FileNotFoundException.class, () -> {
        File output = new File(INPUT_DIR, name.getMethodName() + ".avro");
  
        List<String> args = asList(new File(INPUT_DIR, "/doNotExist").getAbsolutePath(), output.getAbsolutePath());
        new ConcatTool().run(System.in, System.out, System.err, args);
      });
    }
  
    @Test
    void concat() throws Exception {
      Map<String, String> metadata = new HashMap<>();
      metadata.put("myMetaKey", "myMetaValue");
  
      File input1 = generateData(name.getMethodName() + "-1.avro", Type.STRING, metadata, DEFLATE);
      File input2 = generateData(name.getMethodName() + "-2.avro", Type.STRING, metadata, DEFLATE);
      File input3 = generateData(name.getMethodName() + "-3.avro", Type.STRING, metadata, DEFLATE);
  
      File output = new File(OUTPUT_DIR, name.getMethodName() + ".avro");
  
      List<String> args = asList(input1.getAbsolutePath(), input2.getAbsolutePath(), input3.getAbsolutePath(),
          output.getAbsolutePath());
      int returnCode = new ConcatTool().run(System.in, System.out, System.err, args);
      assertEquals(0, returnCode);
  
      assertEquals(ROWS_IN_INPUT_FILES * 3, numRowsInFile(output));
      assertEquals(getCodec(input1).getClass(), getCodec(output).getClass());
    }
  
    @Test
    void differentSchemasFail() throws Exception {
      Map<String, String> metadata = new HashMap<>();
      metadata.put("myMetaKey", "myMetaValue");
  
      File input1 = generateData(name.getMethodName() + "-1.avro", Type.STRING, metadata, DEFLATE);
      File input2 = generateData(name.getMethodName() + "-2.avro", Type.INT, metadata, DEFLATE);
  
      File output = new File(OUTPUT_DIR, name.getMethodName() + ".avro");
  
      List<String> args = asList(input1.getAbsolutePath(), input2.getAbsolutePath(), output.getAbsolutePath());
      int returnCode = new ConcatTool().run(System.in, System.out, System.err, args);
      assertEquals(1, returnCode);
    }
  
    @Test
    void differentMetadataFail() throws Exception {
      Map<String, String> metadata1 = new HashMap<>();
      metadata1.put("myMetaKey", "myMetaValue");
      Map<String, String> metadata2 = new HashMap<>();
      metadata2.put("myOtherMetaKey", "myOtherMetaValue");
  
      File input1 = generateData(name.getMethodName() + "-1.avro", Type.STRING, metadata1, DEFLATE);
      File input2 = generateData(name.getMethodName() + "-2.avro", Type.STRING, metadata2, DEFLATE);
  
      File output = new File(OUTPUT_DIR, name.getMethodName() + ".avro");
  
      List<String> args = asList(input1.getAbsolutePath(), input2.getAbsolutePath(), output.getAbsolutePath());
      int returnCode = new ConcatTool().run(System.in, System.out, System.err, args);
      assertEquals(2, returnCode);
    }
  
    @Test
    void differentCodecFail() throws Exception {
      Map<String, String> metadata = new HashMap<>();
      metadata.put("myMetaKey", "myMetaValue");
  
      File input1 = generateData(name.getMethodName() + "-1.avro", Type.STRING, metadata, DEFLATE);
      File input2 = generateData(name.getMethodName() + "-2.avro", Type.STRING, metadata, CodecFactory.nullCodec());
  
      File output = new File(OUTPUT_DIR, name.getMethodName() + ".avro");
  
      List<String> args = asList(input1.getAbsolutePath(), input2.getAbsolutePath(), output.getAbsolutePath());
      int returnCode = new ConcatTool().run(System.in, System.out, System.err, args);
      assertEquals(3, returnCode);
    }
  
    @Test
    void helpfulMessageWhenNoArgsGiven() throws Exception {
      int returnCode;
      try (ByteArrayOutputStream buffer = new ByteArrayOutputStream(1024)) {
        try (PrintStream out = new PrintStream(buffer)) {
          returnCode = new ConcatTool().run(System.in, out, System.err, Collections.emptyList());
        }
        assertTrue(buffer.toString().trim().length() > 200, "should have lots of help");
      }
      assertEquals(0, returnCode);
    }
  }
  