Package com.google.common.hash

Class HashingOutputStream

  • All Implemented Interfaces:
    java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable
    @Beta
public final class HashingOutputStream
extends java.io.FilterOutputStream
    An OutputStream that maintains a hash of the data written to it.
    Since:
    16.0

    • Field Summary

      • Fields inherited from class java.io.FilterOutputStream

        out

    • Constructor Summary

      Constructors 
      Constructor Description
      HashingOutputStream​(HashFunction hashFunction, java.io.OutputStream out)
      Creates an output stream that hashes using the given HashFunction, and forwards all data written to it to the underlying OutputStream.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void close()  
      HashCode hash()
      Returns the HashCode based on the data written to this stream.
      void write​(byte[] bytes, int off, int len)  
      void write​(int b)  

      • Methods inherited from class java.io.FilterOutputStream

        flush, write

      • Methods inherited from class java.io.OutputStream

        nullOutputStream

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • HashingOutputStream

        public HashingOutputStream​(HashFunction hashFunction,
                           java.io.OutputStream out)
        Creates an output stream that hashes using the given HashFunction, and forwards all data written to it to the underlying OutputStream.

        The OutputStream should not be written to before or after the hand-off.

    • Method Detail

      • write

        public void write​(int b)
           throws java.io.IOException
        Overrides:
        write in class java.io.FilterOutputStream
        Throws:
        java.io.IOException

      • write

        public void write​(byte[] bytes,
                  int off,
                  int len)
           throws java.io.IOException
        Overrides:
        write in class java.io.FilterOutputStream
        Throws:
        java.io.IOException

      • hash

        public HashCode hash()
        Returns the HashCode based on the data written to this stream. The result is unspecified if this method is called more than once on the same instance.

      • close

        public void close()
           throws java.io.IOException
        Specified by:
        close in interface java.lang.AutoCloseable
        Specified by:
        close in interface java.io.Closeable
        Overrides:
        close in class java.io.FilterOutputStream
        Throws:
        java.io.IOException