TestSpecificData.java

/**
 * 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.avro.specific;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.ArrayList;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.apache.avro.FooBarSpecificRecord;
import org.apache.avro.TypeEnum;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.map.ObjectMapper;
import org.junit.Test;
import org.junit.Assert;

import org.apache.avro.Schema;
import org.apache.avro.generic.GenericData;
import org.apache.avro.util.Utf8;

import org.apache.avro.TestSchema;
import org.apache.avro.test.TestRecord;
import org.apache.avro.test.MD5;
import org.apache.avro.test.Kind;
import org.apache.avro.test.Reserved;

import org.apache.avro.generic.GenericRecord;

public class TestSpecificData {

  @Test
  /** Make sure that even with nulls, hashCode() doesn't throw NPE. */
  public void testHashCode() {
    new TestRecord().hashCode();
    SpecificData.get().hashCode(null, TestRecord.SCHEMA$);
  }

  @Test
  /** Make sure that even with nulls, toString() doesn't throw NPE. */
  public void testToString() {
    new TestRecord().toString();
  }

  private static class X {
    public Map<String,String> map;
  }

  @Test
  public void testGetMapSchema() throws Exception {
    SpecificData.get().getSchema(X.class.getField("map").getGenericType());
  }

  @Test
  /** Test nesting of specific data within generic. */
  public void testSpecificWithinGeneric() throws Exception {
    // define a record with a field that's a generated TestRecord
    Schema schema = Schema.createRecord("Foo", "", "x.y.z", false);
    List<Schema.Field> fields = new ArrayList<Schema.Field>();
    fields.add(new Schema.Field("f", TestRecord.SCHEMA$, "", null));
    schema.setFields(fields);

    // create a generic instance of this record
    TestRecord nested = new TestRecord();
    nested.setName("foo");
    nested.setKind(Kind.BAR);
    nested.setHash(new MD5(new byte[]{0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5}));
    GenericData.Record record = new GenericData.Record(schema);
    record.put("f", nested);

    // test that this instance can be written & re-read
    TestSchema.checkBinary(schema, record,
                           new SpecificDatumWriter<Object>(),
                           new SpecificDatumReader<Object>());

    TestSchema.checkDirectBinary(schema, record,
        new SpecificDatumWriter<Object>(),
        new SpecificDatumReader<Object>());

    TestSchema.checkBlockingBinary(schema, record,
        new SpecificDatumWriter<Object>(),
        new SpecificDatumReader<Object>());
}

  @Test public void testConvertGenericToSpecific() {
    GenericRecord generic = new GenericData.Record(TestRecord.SCHEMA$);
    generic.put("name", "foo");
    generic.put("kind", new GenericData.EnumSymbol(Kind.SCHEMA$, "BAR"));
    generic.put("hash", new GenericData.Fixed
                (MD5.SCHEMA$, new byte[]{0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5}));
    TestRecord specific =
      (TestRecord)SpecificData.get().deepCopy(TestRecord.SCHEMA$, generic);
  }

  @Test public void testGetClassSchema() throws Exception {
    Assert.assertEquals(TestRecord.getClassSchema(), TestRecord.SCHEMA$);
    Assert.assertEquals(MD5.getClassSchema(), MD5.SCHEMA$);
    Assert.assertEquals(Kind.getClassSchema(), Kind.SCHEMA$);
  }

  @Test
  public void testSpecificRecordToString() throws IOException {
    FooBarSpecificRecord foo = FooBarSpecificRecord.newBuilder()
      .setId(123)
      .setName("foo")
      .setNicknames(Arrays.asList("bar"))
      .setRelatedids(Arrays.asList(1, 2, 3))
      .setTypeEnum(TypeEnum.c)
      .build();

    String json = foo.toString();
    JsonFactory factory = new JsonFactory();
    JsonParser parser = factory.createJsonParser(json);
    ObjectMapper mapper = new ObjectMapper();

    // will throw exception if string is not parsable json
    mapper.readTree(parser);
  }

  @Test public void testExternalizeable() throws Exception {
    TestRecord before = new TestRecord();
    before.setName("foo");
    before.setKind(Kind.BAR);
    before.setHash(new MD5(new byte[]{0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5}));
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    ObjectOutputStream out = new ObjectOutputStream(bytes);
    out.writeObject(before);
    out.close();

    ObjectInputStream in =
      new ObjectInputStream(new ByteArrayInputStream(bytes.toByteArray()));
    TestRecord after = (TestRecord)in.readObject();

    Assert.assertEquals(before, after);

  }

  @Test public void testReservedEnumSymbol() throws Exception {
    Assert.assertEquals(Reserved.default$,
                        SpecificData.get().createEnum("default",
                                                      Reserved.SCHEMA$));
  }

}