ByteArrayCoder (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Warning: Dataflow SDK 1.x for Java is unsupported as of October 16, 2018. After August 12, 2020, Dataflow will not run jobs using Dataflow 1.x and below. See Migrating from Dataflow SDK 1.x for Java for migration guidance.

Note: If you are using Cloud Dataflow SDK version 2.x, see the Apache Beam API reference documentation.

com.google.cloud.dataflow.sdk.coders

Class ByteArrayCoder

• java.lang.Object
• • com.google.cloud.dataflow.sdk.coders.StandardCoder<T>
  • • com.google.cloud.dataflow.sdk.coders.DeterministicStandardCoder<T>
    • • com.google.cloud.dataflow.sdk.coders.AtomicCoder<byte[]>
      • • com.google.cloud.dataflow.sdk.coders.ByteArrayCoder

• All Implemented Interfaces:

  Coder<byte[]>, Serializable

  ---

  
  

  public class ByteArrayCoder
  extends AtomicCoder<byte[]>

  A Coder for byte[].

  The encoding format is as follows:

  • If in a non-nested context (the byte[] is the only value in the stream), the bytes are read/written directly.
  • If in a nested context, the bytes are prefixed with the length of the array, encoded via a VarIntCoder.

  See Also:

  Serialized Form

• • Nested Class Summary

    • Nested classes/interfaces inherited from interface com.google.cloud.dataflow.sdk.coders.Coder

      Coder.Context, Coder.NonDeterministicException

  • Method Summary

    All Methods Static Methods Instance Methods Concrete Methods 

    Modifier and Type	Method and Description
    byte[]	decode(InputStream inStream, Coder.Context context) Decodes a value of type T from the given input stream in the given context.
    void	encode(byte[] value, OutputStream outStream, Coder.Context context) Encodes the given value of type T onto the given output stream in the given context.
    void	encodeAndOwn(byte[] value, OutputStream outStream, Coder.Context context) Encodes the provided value with the identical encoding to encode(byte[], java.io.OutputStream, com.google.cloud.dataflow.sdk.coders.Coder.Context), but with optimizations that take ownership of the value.
    protected long	getEncodedElementByteSize(byte[] value, Coder.Context context) Returns the size in bytes of the encoded value using this coder.
    boolean	isRegisterByteSizeObserverCheap(byte[] value, Coder.Context context) Returns whether Coder.registerByteSizeObserver(T, com.google.cloud.dataflow.sdk.util.common.ElementByteSizeObserver, com.google.cloud.dataflow.sdk.coders.Coder.Context) cheap enough to call for every element, that is, if this Coder can calculate the byte size of the element to be coded in roughly constant time (or lazily).
    static ByteArrayCoder	of()
    Object	structuralValue(byte[] value) Returns an object with an Object.equals() method that represents structural equality on the argument.

    • Methods inherited from class com.google.cloud.dataflow.sdk.coders.AtomicCoder

      getCoderArguments, getInstanceComponents

    • Methods inherited from class com.google.cloud.dataflow.sdk.coders.DeterministicStandardCoder

      verifyDeterministic

    • Methods inherited from class com.google.cloud.dataflow.sdk.coders.StandardCoder

      asCloudObject, consistentWithEquals, equals, getAllowedEncodings, getComponents, getEncodingId, hashCode, registerByteSizeObserver, toString, verifyDeterministic, verifyDeterministic

    • Methods inherited from class java.lang.Object

      clone, finalize, getClass, notify, notifyAll, wait, wait, wait

• • Method Detail

    • of

      public static ByteArrayCoder of()

    • encode

      public void encode(byte[] value,
                         OutputStream outStream,
                         Coder.Context context)
                  throws IOException,
                         CoderException

      Description copied from interface: Coder
      Encodes the given value of type T onto the given output stream in the given context.

      Throws:

      IOException - if writing to the OutputStream fails for some reason

      CoderException - if the value could not be encoded for some reason

    • encodeAndOwn

      public void encodeAndOwn(byte[] value,
                               OutputStream outStream,
                               Coder.Context context)
                        throws IOException,
                               CoderException

      Encodes the provided value with the identical encoding to encode(byte[], java.io.OutputStream, com.google.cloud.dataflow.sdk.coders.Coder.Context), but with optimizations that take ownership of the value.

      Once passed to this method, value should never be observed or mutated again.

      Throws:

      IOException

      CoderException

    • decode

      public byte[] decode(InputStream inStream,
                           Coder.Context context)
                    throws IOException,
                           CoderException

      Description copied from interface: Coder
      Decodes a value of type T from the given input stream in the given context. Returns the decoded value.

      Throws:

      IOException - if reading from the InputStream fails for some reason

      CoderException - if the value could not be decoded for some reason

    • structuralValue

      public Object structuralValue(byte[] value)

      Returns an object with an Object.equals() method that represents structural equality on the argument.

      For any two values x and y of type T, if their encoded bytes are the same, then it must be the case that structuralValue(x).equals(@code structuralValue(y).

      Most notably:

      • The structural value for an array coder should perform a structural comparison of the contents of the arrays, rather than the default behavior of comparing according to object identity.
      • The structural value for a coder accepting null should be a proper object with an equals() method, even if the input value is null.

      See also Coder.consistentWithEquals().

      Specified by:

      structuralValue in interface Coder<byte[]>

      Overrides:

      structuralValue in class StandardCoder<byte[]>

      Returns:

      objects that are equal if the two arrays contain the same bytes.

    • isRegisterByteSizeObserverCheap

      public boolean isRegisterByteSizeObserverCheap(byte[] value,
                                                     Coder.Context context)

      Returns whether Coder.registerByteSizeObserver(T, com.google.cloud.dataflow.sdk.util.common.ElementByteSizeObserver, com.google.cloud.dataflow.sdk.coders.Coder.Context) cheap enough to call for every element, that is, if this Coder can calculate the byte size of the element to be coded in roughly constant time (or lazily).

      Not intended to be called by user code, but instead by PipelineRunner implementations.

      Specified by:

      isRegisterByteSizeObserverCheap in interface Coder<byte[]>

      Overrides:

      isRegisterByteSizeObserverCheap in class StandardCoder<byte[]>

      Returns:

      true since getEncodedElementByteSize(byte[], com.google.cloud.dataflow.sdk.coders.Coder.Context) runs in constant time using the length of the provided array.

    • getEncodedElementByteSize

      protected long getEncodedElementByteSize(byte[] value,
                                               Coder.Context context)
                                        throws Exception

      Description copied from class: StandardCoder
      Returns the size in bytes of the encoded value using this coder.

      Overrides:

      getEncodedElementByteSize in class StandardCoder<byte[]>

      Throws:

      Exception