Package org.apache.uima.util.impl

Class DataIO

  • public class DataIO
extends java.lang.Object
    Methods for working with Data during I/O

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private static java.lang.ThreadLocal<java.nio.charset.CharsetDecoder> DECODER  
      private static int MASK_LOW_7  
      private static long MASK_LOW_7_LONG  
      private static int SIGNED_INT_VALUE_0x80  
      static java.nio.charset.Charset UTF8  

    • Constructor Summary

      Constructors 
      Constructor Description
      DataIO()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static java.lang.String decodeUTF8​(java.nio.ByteBuffer in, int length)  
      static long lengthUTFv​(java.lang.String string)  
      static int lengthVnumber​(int v)  
      static int lengthVnumber​(long v)  
      static int lengthVPNnumber​(int v)  
      static int lengthVPNnumber​(long v)  
      static byte[] readByteArray​(java.io.DataInput in)  
      static int[] readIntArray​(java.io.DataInput in)  
      static int[] readIntArrayDelta​(java.io.DataInput in)  
      static long[] readLongArray​(java.io.DataInput in)  
      static long[] readLongArrayDelta​(java.io.DataInput in)  
      static long readRestOfVlong​(java.io.DataInput in, int firstByte)  
      static int readUnsignedByte​(java.io.DataInput in)  
      static java.lang.String readUTFv​(java.io.DataInput in)  
      static long readVlong​(java.io.DataInput in)  
      static int readVnumber​(java.io.DataInput in)  
      static void writeByte​(java.io.DataOutput out, int v)
      DataOutputStream writeByte with checking of argument
      static void writeByteArray​(java.io.DataOutput out, byte[] v)  
      static void writeIntArray​(java.io.DataOutput out, int[] v)
      write array preceded by its length
      static void writeIntArrayDelta​(java.io.DataOutput out, int[] v)
      Write delta encoded value, for increasing values
      static void writeLongArray​(java.io.DataOutput out, long[] v)  
      static void writeLongArrayDelta​(java.io.DataOutput out, long[] v)  
      static void writeShort​(java.io.DataOutput out, int v)
      DataOutputStream writeShort with checking of argument
      static void writeUnsignedByte​(java.io.DataOutput out, int v)
      Write lower 8 bits
      static void writeUTFv​(java.lang.String string, java.io.DataOutput out)
      Similar to writeUTF, but ok for strings > 32K bytes long and better for strings < 127 string utf-8 length must be ≤ Integer.MAX_VALUE - 1
      static void writeVnumber​(java.io.DataOutput out, int v)
      Write a positive number with the fewest bytes possible up to 127 written as a byte high order bit on means get another byte Note: value treated as unsigned 32 bit int
      static void writeVnumber​(java.io.DataOutput out, long v)
      Write a positive long with the fewest bytes possible; up to 127 written as a byte, high order bit on means get another byte.
      private static void writeVnumber1​(java.io.DataOutput out, int v)  
      private static void writeVnumber1​(java.io.DataOutput out, long v)  
      static void writeVPNnumber​(java.io.DataOutput out, int v)
      write a positive or negative number, optimized for fewer bytes near 0 sign put in low order bit, rest of number converted to positive and shifted left 1 max negative written as - 0.
      static void writeVPNnumber​(java.io.DataOutput out, long v)  

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • UTF8

        public static final java.nio.charset.Charset UTF8

      • DECODER

        private static java.lang.ThreadLocal<java.nio.charset.CharsetDecoder> DECODER

    • Constructor Detail

      • DataIO

        public DataIO()

    • Method Detail

      • decodeUTF8

        public static java.lang.String decodeUTF8​(java.nio.ByteBuffer in,
                                          int length)

      • writeUTFv

        public static void writeUTFv​(java.lang.String string,
                             java.io.DataOutput out)
                      throws java.io.IOException
        Similar to writeUTF, but ok for strings > 32K bytes long and better for strings < 127 string utf-8 length must be ≤ Integer.MAX_VALUE - 1
        Parameters:
        string - the string to write
        out - the output sink
        Throws:
        java.io.IOException - passthru

      • readUTFv

        public static java.lang.String readUTFv​(java.io.DataInput in)
                                 throws java.io.IOException
        Throws:
        java.io.IOException

      • lengthUTFv

        public static long lengthUTFv​(java.lang.String string)
                       throws java.io.UnsupportedEncodingException
        Throws:
        java.io.UnsupportedEncodingException

      • writeShort

        public static void writeShort​(java.io.DataOutput out,
                              int v)
                       throws java.io.IOException
        DataOutputStream writeShort with checking of argument
        Parameters:
        out - the output sink
        v - the value to write
        Throws:
        java.io.IOException - passthru

      • writeByte

        public static void writeByte​(java.io.DataOutput out,
                             int v)
                      throws java.io.IOException
        DataOutputStream writeByte with checking of argument
        Parameters:
        out - output sink
        v - the value to write
        Throws:
        java.io.IOException - passthru

      • writeUnsignedByte

        public static void writeUnsignedByte​(java.io.DataOutput out,
                                     int v)
                              throws java.io.IOException
        Write lower 8 bits
        Parameters:
        out - output sink
        v - the value to write
        Throws:
        java.io.IOException - passthru

      • writeVPNnumber

        public static void writeVPNnumber​(java.io.DataOutput out,
                                  int v)
                           throws java.io.IOException
        write a positive or negative number, optimized for fewer bytes near 0 sign put in low order bit, rest of number converted to positive and shifted left 1 max negative written as - 0.
        Parameters:
        out - output sink
        v - the value to write
        Throws:
        java.io.IOException - passthru

      • writeVPNnumber

        public static void writeVPNnumber​(java.io.DataOutput out,
                                  long v)
                           throws java.io.IOException
        Throws:
        java.io.IOException

      • lengthVPNnumber

        public static int lengthVPNnumber​(int v)

      • lengthVPNnumber

        public static int lengthVPNnumber​(long v)

      • writeVnumber

        public static void writeVnumber​(java.io.DataOutput out,
                                int v)
                         throws java.io.IOException
        Write a positive number with the fewest bytes possible up to 127 written as a byte high order bit on means get another byte Note: value treated as unsigned 32 bit int
        Parameters:
        out - output sink
        v - the value to write
        Throws:
        java.io.IOException - passthru

      • writeVnumber1

        private static void writeVnumber1​(java.io.DataOutput out,
                                  int v)
                           throws java.io.IOException
        Throws:
        java.io.IOException

      • lengthVnumber

        public static int lengthVnumber​(int v)

      • readVnumber

        public static int readVnumber​(java.io.DataInput in)
                       throws java.io.IOException
        Throws:
        java.io.IOException

      • writeVnumber

        public static void writeVnumber​(java.io.DataOutput out,
                                long v)
                         throws java.io.IOException
        Write a positive long with the fewest bytes possible; up to 127 written as a byte, high order bit on means get another byte.
        Parameters:
        out - output sink
        v - the value to write is never negative
        Throws:
        java.io.IOException - passthru

      • writeVnumber1

        private static void writeVnumber1​(java.io.DataOutput out,
                                  long v)
                           throws java.io.IOException
        Throws:
        java.io.IOException

      • lengthVnumber

        public static int lengthVnumber​(long v)

      • readVlong

        public static long readVlong​(java.io.DataInput in)
                      throws java.io.IOException
        Throws:
        java.io.IOException

      • readRestOfVlong

        public static long readRestOfVlong​(java.io.DataInput in,
                                   int firstByte)
                            throws java.io.IOException
        Throws:
        java.io.IOException

      • writeByteArray

        public static void writeByteArray​(java.io.DataOutput out,
                                  byte[] v)
                           throws java.io.IOException
        Throws:
        java.io.IOException

      • readByteArray

        public static byte[] readByteArray​(java.io.DataInput in)
                            throws java.io.IOException
        Throws:
        java.io.IOException

      • writeIntArray

        public static void writeIntArray​(java.io.DataOutput out,
                                 int[] v)
                          throws java.io.IOException
        write array preceded by its length
        Parameters:
        out - output sink
        v - the value to write
        Throws:
        java.io.IOException - passthru

      • readIntArray

        public static int[] readIntArray​(java.io.DataInput in)
                          throws java.io.IOException
        Throws:
        java.io.IOException

      • writeIntArrayDelta

        public static void writeIntArrayDelta​(java.io.DataOutput out,
                                      int[] v)
                               throws java.io.IOException
        Write delta encoded value, for increasing values
        Parameters:
        out - output sink
        v - the value to write
        Throws:
        java.io.IOException - passthru

      • readIntArrayDelta

        public static int[] readIntArrayDelta​(java.io.DataInput in)
                               throws java.io.IOException
        Throws:
        java.io.IOException

      • writeLongArray

        public static void writeLongArray​(java.io.DataOutput out,
                                  long[] v)
                           throws java.io.IOException
        Throws:
        java.io.IOException

      • readLongArray

        public static long[] readLongArray​(java.io.DataInput in)
                            throws java.io.IOException
        Throws:
        java.io.IOException

      • writeLongArrayDelta

        public static void writeLongArrayDelta​(java.io.DataOutput out,
                                       long[] v)
                                throws java.io.IOException
        Throws:
        java.io.IOException

      • readLongArrayDelta

        public static long[] readLongArrayDelta​(java.io.DataInput in)
                                 throws java.io.IOException
        Throws:
        java.io.IOException

      • readUnsignedByte

        public static int readUnsignedByte​(java.io.DataInput in)
                            throws java.io.IOException
        Throws:
        java.io.IOException