org.apache.spark.api.java.Optional.isPresent()方法的使用及代码示例

x33g5p2x  于2022-01-26 转载在 其他  
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本文整理了Java中org.apache.spark.api.java.Optional.isPresent()方法的一些代码示例，展示了Optional.isPresent()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Optional.isPresent()方法的具体详情如下：
包路径：org.apache.spark.api.java.Optional
类名称：Optional
方法名：isPresent

Optional.isPresent介绍

暂无

代码示例

代码示例来源：origin: org.apache.spark/spark-core_2.10

@Test
public void leftOuterJoin() {
 JavaPairRDD<Integer, Integer> rdd1 = sc.parallelizePairs(Arrays.asList(
  new Tuple2<>(1, 1),
  new Tuple2<>(1, 2),
  new Tuple2<>(2, 1),
  new Tuple2<>(3, 1)
 ));
 JavaPairRDD<Integer, Character> rdd2 = sc.parallelizePairs(Arrays.asList(
  new Tuple2<>(1, 'x'),
  new Tuple2<>(2, 'y'),
  new Tuple2<>(2, 'z'),
  new Tuple2<>(4, 'w')
 ));
 List<Tuple2<Integer, Tuple2<Integer, Optional<Character>>>> joined =
  rdd1.leftOuterJoin(rdd2).collect();
 Assert.assertEquals(5, joined.size());
 Tuple2<Integer, Tuple2<Integer, Optional<Character>>> firstUnmatched =
  rdd1.leftOuterJoin(rdd2).filter(tup -> !tup._2()._2().isPresent()).first();
 Assert.assertEquals(3, firstUnmatched._1().intValue());
}

代码示例来源：origin: org.apache.spark/spark-core

@Test
public void leftOuterJoin() {
 JavaPairRDD<Integer, Integer> rdd1 = sc.parallelizePairs(Arrays.asList(
  new Tuple2<>(1, 1),
  new Tuple2<>(1, 2),
  new Tuple2<>(2, 1),
  new Tuple2<>(3, 1)
 ));
 JavaPairRDD<Integer, Character> rdd2 = sc.parallelizePairs(Arrays.asList(
  new Tuple2<>(1, 'x'),
  new Tuple2<>(2, 'y'),
  new Tuple2<>(2, 'z'),
  new Tuple2<>(4, 'w')
 ));
 List<Tuple2<Integer, Tuple2<Integer, Optional<Character>>>> joined =
  rdd1.leftOuterJoin(rdd2).collect();
 Assert.assertEquals(5, joined.size());
 Tuple2<Integer, Tuple2<Integer, Optional<Character>>> firstUnmatched =
  rdd1.leftOuterJoin(rdd2).filter(tup -> !tup._2()._2().isPresent()).first();
 Assert.assertEquals(3, firstUnmatched._1().intValue());
}

代码示例来源：origin: org.apache.spark/spark-core_2.11

@Test
public void testOfNullable() {
 Assert.assertTrue(Optional.ofNullable(1).isPresent());
 Assert.assertNotNull(Optional.ofNullable(1).orNull());
 Assert.assertEquals(Integer.valueOf(1), Optional.ofNullable(1).get());
 Assert.assertEquals(Integer.valueOf(1), Optional.ofNullable(1).or(2));
 Assert.assertEquals(Integer.valueOf(1), Optional.ofNullable(1).orElse(2));
 Assert.assertFalse(Optional.ofNullable(null).isPresent());
 Assert.assertNull(Optional.ofNullable(null).orNull());
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>ofNullable(null).or(2));
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>ofNullable(null).orElse(2));
}

代码示例来源：origin: org.apache.spark/spark-core_2.11

@Test
public void testFromNullable() {
 Assert.assertTrue(Optional.fromNullable(1).isPresent());
 Assert.assertNotNull(Optional.fromNullable(1).orNull());
 Assert.assertEquals(Integer.valueOf(1), Optional.fromNullable(1).get());
 Assert.assertEquals(Integer.valueOf(1), Optional.fromNullable(1).or(2));
 Assert.assertEquals(Integer.valueOf(1), Optional.fromNullable(1).orElse(2));
 Assert.assertFalse(Optional.fromNullable(null).isPresent());
 Assert.assertNull(Optional.fromNullable(null).orNull());
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>fromNullable(null).or(2));
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>fromNullable(null).orElse(2));
}

代码示例来源：origin: org.apache.spark/spark-core_2.10

@Test
public void testFromNullable() {
 Assert.assertTrue(Optional.fromNullable(1).isPresent());
 Assert.assertNotNull(Optional.fromNullable(1).orNull());
 Assert.assertEquals(Integer.valueOf(1), Optional.fromNullable(1).get());
 Assert.assertEquals(Integer.valueOf(1), Optional.fromNullable(1).or(2));
 Assert.assertEquals(Integer.valueOf(1), Optional.fromNullable(1).orElse(2));
 Assert.assertFalse(Optional.fromNullable(null).isPresent());
 Assert.assertNull(Optional.fromNullable(null).orNull());
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>fromNullable(null).or(2));
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>fromNullable(null).orElse(2));
}

代码示例来源：origin: org.apache.spark/spark-core

@Test
public void testOfNullable() {
 Assert.assertTrue(Optional.ofNullable(1).isPresent());
 Assert.assertNotNull(Optional.ofNullable(1).orNull());
 Assert.assertEquals(Integer.valueOf(1), Optional.ofNullable(1).get());
 Assert.assertEquals(Integer.valueOf(1), Optional.ofNullable(1).or(2));
 Assert.assertEquals(Integer.valueOf(1), Optional.ofNullable(1).orElse(2));
 Assert.assertFalse(Optional.ofNullable(null).isPresent());
 Assert.assertNull(Optional.ofNullable(null).orNull());
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>ofNullable(null).or(2));
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>ofNullable(null).orElse(2));
}

代码示例来源：origin: org.apache.spark/spark-core

@Test
public void testFromNullable() {
 Assert.assertTrue(Optional.fromNullable(1).isPresent());
 Assert.assertNotNull(Optional.fromNullable(1).orNull());
 Assert.assertEquals(Integer.valueOf(1), Optional.fromNullable(1).get());
 Assert.assertEquals(Integer.valueOf(1), Optional.fromNullable(1).or(2));
 Assert.assertEquals(Integer.valueOf(1), Optional.fromNullable(1).orElse(2));
 Assert.assertFalse(Optional.fromNullable(null).isPresent());
 Assert.assertNull(Optional.fromNullable(null).orNull());
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>fromNullable(null).or(2));
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>fromNullable(null).orElse(2));
}

代码示例来源：origin: org.apache.spark/spark-core_2.10

@Test
public void testOfNullable() {
 Assert.assertTrue(Optional.ofNullable(1).isPresent());
 Assert.assertNotNull(Optional.ofNullable(1).orNull());
 Assert.assertEquals(Integer.valueOf(1), Optional.ofNullable(1).get());
 Assert.assertEquals(Integer.valueOf(1), Optional.ofNullable(1).or(2));
 Assert.assertEquals(Integer.valueOf(1), Optional.ofNullable(1).orElse(2));
 Assert.assertFalse(Optional.ofNullable(null).isPresent());
 Assert.assertNull(Optional.ofNullable(null).orNull());
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>ofNullable(null).or(2));
 Assert.assertEquals(Integer.valueOf(2), Optional.<Integer>ofNullable(null).orElse(2));
}

代码示例来源：origin: org.apache.spark/spark-core

@Test
public void testOf() {
 Assert.assertTrue(Optional.of(1).isPresent());
 Assert.assertNotNull(Optional.of(1).orNull());
 Assert.assertEquals(Integer.valueOf(1), Optional.of(1).get());
 Assert.assertEquals(Integer.valueOf(1), Optional.of(1).or(2));
 Assert.assertEquals(Integer.valueOf(1), Optional.of(1).orElse(2));
}

代码示例来源：origin: org.apache.spark/spark-core_2.10

@Test
public void testOf() {
 Assert.assertTrue(Optional.of(1).isPresent());
 Assert.assertNotNull(Optional.of(1).orNull());
 Assert.assertEquals(Integer.valueOf(1), Optional.of(1).get());
 Assert.assertEquals(Integer.valueOf(1), Optional.of(1).or(2));
 Assert.assertEquals(Integer.valueOf(1), Optional.of(1).orElse(2));
}

代码示例来源：origin: org.apache.spark/spark-core_2.11

@Test
public void testOf() {
 Assert.assertTrue(Optional.of(1).isPresent());
 Assert.assertNotNull(Optional.of(1).orNull());
 Assert.assertEquals(Integer.valueOf(1), Optional.of(1).get());
 Assert.assertEquals(Integer.valueOf(1), Optional.of(1).or(2));
 Assert.assertEquals(Integer.valueOf(1), Optional.of(1).orElse(2));
}

代码示例来源：origin: org.apache.spark/spark-core_2.11

@Test
public void checkpointAndRestore() {
 JavaRDD<Integer> rdd = sc.parallelize(Arrays.asList(1, 2, 3, 4, 5));
 sc.setCheckpointDir(tempDir.getAbsolutePath());
 assertFalse(rdd.isCheckpointed());
 rdd.checkpoint();
 rdd.count(); // Forces the DAG to cause a checkpoint
 assertTrue(rdd.isCheckpointed());
 assertTrue(rdd.getCheckpointFile().isPresent());
 JavaRDD<Integer> recovered = sc.checkpointFile(rdd.getCheckpointFile().get());
 assertEquals(Arrays.asList(1, 2, 3, 4, 5), recovered.collect());
}

代码示例来源：origin: org.apache.spark/spark-core_2.10

@Test
public void checkpointAndRestore() {
 JavaRDD<Integer> rdd = sc.parallelize(Arrays.asList(1, 2, 3, 4, 5));
 sc.setCheckpointDir(tempDir.getAbsolutePath());
 assertFalse(rdd.isCheckpointed());
 rdd.checkpoint();
 rdd.count(); // Forces the DAG to cause a checkpoint
 assertTrue(rdd.isCheckpointed());
 assertTrue(rdd.getCheckpointFile().isPresent());
 JavaRDD<Integer> recovered = sc.checkpointFile(rdd.getCheckpointFile().get());
 assertEquals(Arrays.asList(1, 2, 3, 4, 5), recovered.collect());
}

代码示例来源：origin: org.apache.spark/spark-core

@Test
public void checkpointAndRestore() {
 JavaRDD<Integer> rdd = sc.parallelize(Arrays.asList(1, 2, 3, 4, 5));
 sc.setCheckpointDir(tempDir.getAbsolutePath());
 assertFalse(rdd.isCheckpointed());
 rdd.checkpoint();
 rdd.count(); // Forces the DAG to cause a checkpoint
 assertTrue(rdd.isCheckpointed());
 assertTrue(rdd.getCheckpointFile().isPresent());
 JavaRDD<Integer> recovered = sc.checkpointFile(rdd.getCheckpointFile().get());
 assertEquals(Arrays.asList(1, 2, 3, 4, 5), recovered.collect());
}

代码示例来源：origin: org.apache.spark/spark-core_2.11

@Test
public void testEmpty() {
 Assert.assertFalse(Optional.empty().isPresent());
 Assert.assertNull(Optional.empty().orNull());
 Assert.assertEquals("foo", Optional.empty().or("foo"));
 Assert.assertEquals("foo", Optional.empty().orElse("foo"));
}

代码示例来源：origin: org.apache.spark/spark-core

@Test
public void testAbsent() {
 Assert.assertFalse(Optional.absent().isPresent());
 Assert.assertNull(Optional.absent().orNull());
 Assert.assertEquals("foo", Optional.absent().or("foo"));
 Assert.assertEquals("foo", Optional.absent().orElse("foo"));
}

代码示例来源：origin: org.apache.spark/spark-core_2.10

@Test
public void testEmpty() {
 Assert.assertFalse(Optional.empty().isPresent());
 Assert.assertNull(Optional.empty().orNull());
 Assert.assertEquals("foo", Optional.empty().or("foo"));
 Assert.assertEquals("foo", Optional.empty().orElse("foo"));
}

代码示例来源：origin: org.apache.spark/spark-core

@Test
public void testEmpty() {
 Assert.assertFalse(Optional.empty().isPresent());
 Assert.assertNull(Optional.empty().orNull());
 Assert.assertEquals("foo", Optional.empty().or("foo"));
 Assert.assertEquals("foo", Optional.empty().orElse("foo"));
}

代码示例来源：origin: org.apache.spark/spark-core_2.10

@Test
public void testAbsent() {
 Assert.assertFalse(Optional.absent().isPresent());
 Assert.assertNull(Optional.absent().orNull());
 Assert.assertEquals("foo", Optional.absent().or("foo"));
 Assert.assertEquals("foo", Optional.absent().orElse("foo"));
}

代码示例来源：origin: org.apache.spark/spark-core_2.11

@Test
public void testAbsent() {
 Assert.assertFalse(Optional.absent().isPresent());
 Assert.assertNull(Optional.absent().orNull());
 Assert.assertEquals("foo", Optional.absent().or("foo"));
 Assert.assertEquals("foo", Optional.absent().orElse("foo"));
}

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