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
   *
   *    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.arrow.tools;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import org.apache.arrow.memory.BufferAllocator;
  import org.apache.arrow.vector.BigIntVector;
  import org.apache.arrow.vector.FieldVector;
  import org.apache.arrow.vector.IntVector;
  import org.apache.arrow.vector.VectorSchemaRoot;
  import org.apache.arrow.vector.ViewVarBinaryVector;
  import org.apache.arrow.vector.ViewVarCharVector;
  import org.apache.arrow.vector.complex.NonNullableStructVector;
  import org.apache.arrow.vector.complex.impl.ComplexWriterImpl;
  import org.apache.arrow.vector.complex.writer.BaseWriter.ComplexWriter;
  import org.apache.arrow.vector.complex.writer.BaseWriter.StructWriter;
  import org.apache.arrow.vector.complex.writer.BigIntWriter;
  import org.apache.arrow.vector.complex.writer.IntWriter;
  import org.apache.arrow.vector.complex.writer.ViewVarBinaryWriter;
  import org.apache.arrow.vector.complex.writer.ViewVarCharWriter;
  import org.apache.arrow.vector.ipc.ArrowFileReader;
  import org.apache.arrow.vector.ipc.ArrowFileWriter;
  import org.apache.arrow.vector.ipc.message.ArrowBlock;
  import org.apache.arrow.vector.util.Text;
  
  public class ArrowFileTestFixtures {
    static final int COUNT = 10;
  
    static void writeData(int count, NonNullableStructVector parent) {
      ComplexWriter writer = new ComplexWriterImpl("root", parent);
      StructWriter rootWriter = writer.rootAsStruct();
      IntWriter intWriter = rootWriter.integer("int");
      BigIntWriter bigIntWriter = rootWriter.bigInt("bigInt");
      for (int i = 0; i < count; i++) {
        intWriter.setPosition(i);
        intWriter.writeInt(i);
        bigIntWriter.setPosition(i);
        bigIntWriter.writeBigInt(i);
      }
      writer.setValueCount(count);
    }
  
    private static String generateString(int length) {
      StringBuilder stringBuilder = new StringBuilder(length);
  
      for (int i = 0; i < length; i++) {
        stringBuilder.append(i);
      }
  
      return stringBuilder.toString();
    }
  
    private static byte[] generateBytes(int length) {
      byte[] bytes = new byte[length];
      for (int i = 0; i < length; i++) {
        bytes[i] = (byte) i;
      }
      return bytes;
    }
  
    static void writeVariableWidthViewData(int count, NonNullableStructVector parent) {
      ComplexWriter writer = new ComplexWriterImpl("root", parent);
      StructWriter rootWriter = writer.rootAsStruct();
      ViewVarCharWriter viewVarCharWriter = rootWriter.viewVarChar("viewVarChar");
      ViewVarBinaryWriter viewVarBinaryWriter = rootWriter.viewVarBinary("viewVarBinary");
      IntWriter intWriter = rootWriter.integer("int");
      BigIntWriter bigIntWriter = rootWriter.bigInt("bigInt");
      for (int i = 0; i < count; i++) {
        viewVarCharWriter.setPosition(i);
        viewVarCharWriter.writeViewVarChar(generateString(i));
        viewVarBinaryWriter.setPosition(i);
        viewVarBinaryWriter.writeViewVarBinary(generateBytes(i));
        intWriter.setPosition(i);
        intWriter.writeInt(i);
        bigIntWriter.setPosition(i);
        bigIntWriter.writeBigInt(i);
      }
      writer.setValueCount(count);
    }
  
    static void validateOutput(File testOutFile, BufferAllocator allocator) throws Exception {
      // read
      try (BufferAllocator readerAllocator =
              allocator.newChildAllocator("reader", 0, Integer.MAX_VALUE);
          FileInputStream fileInputStream = new FileInputStream(testOutFile);
          ArrowFileReader arrowReader =
              new ArrowFileReader(fileInputStream.getChannel(), readerAllocator)) {
        VectorSchemaRoot root = arrowReader.getVectorSchemaRoot();
        for (ArrowBlock rbBlock : arrowReader.getRecordBlocks()) {
          if (!arrowReader.loadRecordBatch(rbBlock)) {
            throw new IOException("Expected to read record batch");
          }
          validateContent(COUNT, root);
        }
      }
    }
  
    static void validateVariadicOutput(File testOutFile, BufferAllocator allocator, int count)
        throws Exception {
      // read
      try (BufferAllocator readerAllocator =
              allocator.newChildAllocator("reader", 0, Integer.MAX_VALUE);
          FileInputStream fileInputStream = new FileInputStream(testOutFile);
          ArrowFileReader arrowReader =
              new ArrowFileReader(fileInputStream.getChannel(), readerAllocator)) {
        VectorSchemaRoot root = arrowReader.getVectorSchemaRoot();
        for (ArrowBlock rbBlock : arrowReader.getRecordBlocks()) {
          if (!arrowReader.loadRecordBatch(rbBlock)) {
            throw new IOException("Expected to read record batch");
          }
          validateVariadicContent(count, root);
        }
      }
    }
  
    static void validateContent(int count, VectorSchemaRoot root) {
      assertEquals(count, root.getRowCount());
      for (int i = 0; i < count; i++) {
        assertEquals(i, root.getVector("int").getObject(i));
        assertEquals(Long.valueOf(i), root.getVector("bigInt").getObject(i));
      }
    }
  
    static void validateVariadicContent(int count, VectorSchemaRoot root) {
      assertEquals(count, root.getRowCount());
      ViewVarCharVector viewVarCharVector = (ViewVarCharVector) root.getVector("viewVarChar");
      ViewVarBinaryVector viewVarBinaryVector = (ViewVarBinaryVector) root.getVector("viewVarBinary");
      IntVector intVector = (IntVector) root.getVector("int");
      BigIntVector bigIntVector = (BigIntVector) root.getVector("bigInt");
      for (int i = 0; i < count; i++) {
        assertEquals(new Text(generateString(i)), viewVarCharVector.getObject(i));
        assertArrayEquals(generateBytes(i), viewVarBinaryVector.get(i));
        assertEquals(i, intVector.getObject(i));
        assertEquals(Long.valueOf(i), bigIntVector.getObject(i));
      }
    }
  
    static void write(FieldVector parent, File file) throws IOException {
      VectorSchemaRoot root = new VectorSchemaRoot(parent);
      try (FileOutputStream fileOutputStream = new FileOutputStream(file);
          ArrowFileWriter arrowWriter =
              new ArrowFileWriter(root, null, fileOutputStream.getChannel())) {
        arrowWriter.writeBatch();
      }
    }
  
    static void writeInput(File testInFile, BufferAllocator allocator) throws IOException {
      try (BufferAllocator vectorAllocator =
              allocator.newChildAllocator("original vectors", 0, Integer.MAX_VALUE);
          NonNullableStructVector parent = NonNullableStructVector.empty("parent", vectorAllocator)) {
        writeData(COUNT, parent);
        write(parent.getChild("root"), testInFile);
      }
    }
  
    static void writeVariableWidthViewInput(File testInFile, BufferAllocator allocator, int count)
        throws IOException {
      try (BufferAllocator vectorAllocator =
              allocator.newChildAllocator("original view vectors", 0, Integer.MAX_VALUE);
          NonNullableStructVector parent = NonNullableStructVector.empty("parent", vectorAllocator)) {
        writeVariableWidthViewData(count, parent);
        write(parent.getChild("root"), testInFile);
      }
    }
  }
  