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.file;
  
  import org.apache.avro.Schema;
  import org.apache.avro.Schema.Field;
  import org.apache.avro.Schema.Type;
  import org.apache.avro.generic.GenericData.Record;
  import org.apache.avro.generic.GenericDatumReader;
  import org.apache.avro.generic.GenericRecord;
  import org.apache.avro.generic.IndexedRecord;
  import org.apache.avro.specific.SpecificDatumWriter;
  import org.apache.avro.util.Utf8;
  import org.junit.jupiter.api.Test;
  
  import java.io.ByteArrayOutputStream;
  import java.io.EOFException;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import java.util.ArrayList;
  import java.util.List;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class TestSeekableByteArrayInput {
  
    private byte[] getSerializedMessage(IndexedRecord message, Schema schema) throws Exception {
      ByteArrayOutputStream baos = new ByteArrayOutputStream(4096);
      SpecificDatumWriter<IndexedRecord> writer = new SpecificDatumWriter<>();
      try (DataFileWriter<IndexedRecord> dfw = new DataFileWriter<>(writer).create(schema, baos)) {
        dfw.append(message);
      }
      return baos.toByteArray();
    }
  
    private Schema getTestSchema() throws Exception {
      Schema schema = Schema.createRecord("TestRecord", "this is a test record", "org.apache.avro.file", false);
      List<Field> fields = new ArrayList<>();
      fields.add(new Field("name", Schema.create(Type.STRING), "this is a test field"));
      schema.setFields(fields);
      return schema;
    }
  
    @Test
    void serialization() throws Exception {
      Schema testSchema = getTestSchema();
      GenericRecord message = new Record(testSchema);
      message.put("name", "testValue");
  
      byte[] data = getSerializedMessage(message, testSchema);
  
      GenericDatumReader<IndexedRecord> reader = new GenericDatumReader<>(testSchema);
      final IndexedRecord result;
      try (SeekableInput in = new SeekableByteArrayInput(data);
          FileReader<IndexedRecord> dfr = DataFileReader.openReader(in, reader)) {
        result = dfr.next();
      }
      assertNotNull(result);
      assertInstanceOf(GenericRecord.class, result);
      assertEquals(new Utf8("testValue"), ((GenericRecord) result).get("name"));
    }
  
    @Test
    void readingData() throws IOException {
      byte[] data = "0123456789ABCD".getBytes(StandardCharsets.UTF_8);
      byte[] result = new byte[16];
      try (SeekableInput in = new SeekableByteArrayInput(data)) {
        in.read(result, 0, 8);
        in.seek(4);
        in.read(result, 8, 8);
        assertEquals(12, in.tell());
        assertEquals(data.length, in.length());
        assertEquals("01234567456789AB", new String(result, StandardCharsets.UTF_8));
      }
    }
  
    @Test
    void illegalSeeks() throws IOException {
      byte[] data = "0123456789ABCD".getBytes(StandardCharsets.UTF_8);
      try (SeekableInput in = new SeekableByteArrayInput(data)) {
        byte[] buf = new byte[2];
        in.read(buf, 0, buf.length);
        in.seek(-4);
        assertEquals(2, in.tell());
  
        assertThrows(EOFException.class, () -> in.seek(64));
      }
    }
  }
  