Package edu.princeton.cs.algs4

Class BinaryIn

  • public final class BinaryIn
extends Object
    The BinaryIn data type provides methods for reading in bits from a binary input stream. It can process the bits one bit at a time (as a boolean), 8 bits at a time (as a byte or char), 16 bits at a time (as a short), 32 bits at a time (as an int or float), or 64 bits at a time (as a double or long).

    The binary input stream can be from standard input, a filename, a URL name, a Socket, or an InputStream.

    All primitive types are assumed to be represented using their standard Java representations, in big-endian (most significant byte first) order.

    The client should not intermix calls to BinaryIn with calls to In; otherwise unexpected behavior will result.

    Author:
    Robert Sedgewick, Kevin Wayne

    • Constructor Summary

      Constructors 
      Constructor Description
      BinaryIn()
      Initializes a binary input stream from standard input.
      BinaryIn​(InputStream is)
      Initializes a binary input stream from an InputStream.
      BinaryIn​(String name)
      Initializes a binary input stream from a filename or URL name.
      BinaryIn​(Socket socket)
      Initializes a binary input stream from a socket.
      BinaryIn​(URL url)
      Initializes a binary input stream from a URL.

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean exists()
      Returns true if this binary input stream exists.
      boolean isEmpty()
      Returns true if this binary input stream is empty.
      static void main​(String[] args)
      Unit tests the BinaryIn data type.
      boolean readBoolean()
      Reads the next bit of data from this binary input stream and return as a boolean.
      byte readByte()
      Reads the next 8 bits from this binary input stream and return as an 8-bit byte.
      char readChar()
      Reads the next 8 bits from this binary input stream and return as an 8-bit char.
      char readChar​(int r)
      Reads the next r bits from this binary input stream and return as an r-bit character.
      double readDouble()
      Reads the next 64 bits from this binary input stream and return as a 64-bit double.
      float readFloat()
      Reads the next 32 bits from this binary input stream and return as a 32-bit float.
      int readInt()
      Reads the next 32 bits from this binary input stream and return as a 32-bit int.
      int readInt​(int r)
      Reads the next r bits from this binary input stream return as an r-bit int.
      long readLong()
      Reads the next 64 bits from this binary input stream and return as a 64-bit long.
      short readShort()
      Reads the next 16 bits from this binary input stream and return as a 16-bit short.
      String readString()
      Reads the remaining bytes of data from this binary input stream and return as a string.

    • Constructor Detail

      • BinaryIn

        public BinaryIn()
        Initializes a binary input stream from standard input.

      • BinaryIn

        public BinaryIn​(InputStream is)
        Initializes a binary input stream from an InputStream.
        Parameters:
        is - the InputStream object

      • BinaryIn

        public BinaryIn​(Socket socket)
        Initializes a binary input stream from a socket.
        Parameters:
        socket - the socket

      • BinaryIn

        public BinaryIn​(URL url)
        Initializes a binary input stream from a URL.
        Parameters:
        url - the URL

      • BinaryIn

        public BinaryIn​(String name)
        Initializes a binary input stream from a filename or URL name.
        Parameters:
        name - the name of the file or URL

    • Method Detail

      • exists

        public boolean exists()
        Returns true if this binary input stream exists.
        Returns:
        true if this binary input stream exists; false otherwise

      • isEmpty

        public boolean isEmpty()
        Returns true if this binary input stream is empty.
        Returns:
        true if this binary input stream is empty; false otherwise

      • readBoolean

        public boolean readBoolean()
        Reads the next bit of data from this binary input stream and return as a boolean.
        Returns:
        the next bit of data from this binary input stream as a boolean
        Throws:
        NoSuchElementException - if this binary input stream is empty

      • readChar

        public char readChar()
        Reads the next 8 bits from this binary input stream and return as an 8-bit char.
        Returns:
        the next 8 bits of data from this binary input stream as a char
        Throws:
        NoSuchElementException - if there are fewer than 8 bits available

      • readChar

        public char readChar​(int r)
        Reads the next r bits from this binary input stream and return as an r-bit character.
        Parameters:
        r - number of bits to read
        Returns:
        the next r bits of data from this binary input stream as a char
        Throws:
        NoSuchElementException - if there are fewer than r bits available
        IllegalArgumentException - unless 1 <= r <= 16

      • readString

        public String readString()
        Reads the remaining bytes of data from this binary input stream and return as a string.
        Returns:
        the remaining bytes of data from this binary input stream as a String
        Throws:
        NoSuchElementException - if this binary input stream is empty or if the number of bits available is not a multiple of 8 (byte-aligned)

      • readShort

        public short readShort()
        Reads the next 16 bits from this binary input stream and return as a 16-bit short.
        Returns:
        the next 16 bits of data from this binary input stream as a short
        Throws:
        NoSuchElementException - if there are fewer than 16 bits available

      • readInt

        public int readInt()
        Reads the next 32 bits from this binary input stream and return as a 32-bit int.
        Returns:
        the next 32 bits of data from this binary input stream as a int
        Throws:
        NoSuchElementException - if there are fewer than 32 bits available

      • readInt

        public int readInt​(int r)
        Reads the next r bits from this binary input stream return as an r-bit int.
        Parameters:
        r - number of bits to read
        Returns:
        the next r bits of data from this binary input stream as a int
        Throws:
        NoSuchElementException - if there are fewer than r bits available
        IllegalArgumentException - unless 1 <= r <= 32

      • readLong

        public long readLong()
        Reads the next 64 bits from this binary input stream and return as a 64-bit long.
        Returns:
        the next 64 bits of data from this binary input stream as a long
        Throws:
        NoSuchElementException - if there are fewer than 64 bits available

      • readDouble

        public double readDouble()
        Reads the next 64 bits from this binary input stream and return as a 64-bit double.
        Returns:
        the next 64 bits of data from this binary input stream as a double
        Throws:
        NoSuchElementException - if there are fewer than 64 bits available

      • readFloat

        public float readFloat()
        Reads the next 32 bits from this binary input stream and return as a 32-bit float.
        Returns:
        the next 32 bits of data from this binary input stream as a float
        Throws:
        NoSuchElementException - if there are fewer than 32 bits available

      • readByte

        public byte readByte()
        Reads the next 8 bits from this binary input stream and return as an 8-bit byte.
        Returns:
        the next 8 bits of data from this binary input stream as a byte
        Throws:
        NoSuchElementException - if there are fewer than 8 bits available

      • main

        public static void main​(String[] args)
        Unit tests the BinaryIn data type. Reads the name of a file or URL (first command-line argument) and writes it to a file (second command-line argument).
        Parameters:
        args - the command-line arguments