Class ByteArrayWrapper

  • All Implemented Interfaces:
    Comparable<ByteArrayWrapper>
    Direct Known Subclasses:
    RawCollationKey

    public class ByteArrayWrapper
    extends Object
    implements Comparable<ByteArrayWrapper>
    A simple utility class to wrap a byte array.

    Generally passed as an argument object into a method. The method takes responsibility of writing into the internal byte array and increasing its size when necessary.

    Author:
    syn wee
    • Field Summary

      Fields 
      Modifier and Type Field Description
      byte[] bytes
      Internal byte array.
      int size
      Size of the internal byte array used.
    • Constructor Summary

      Constructors 
      Constructor Description
      ByteArrayWrapper()
      Construct a new ByteArrayWrapper with no data.
      ByteArrayWrapper​(byte[] bytesToAdopt, int size)
      Construct a new ByteArrayWrapper from a byte array and size
      ByteArrayWrapper​(ByteBuffer source)
      Construct a new ByteArrayWrapper from the contents of a ByteBuffer.
    • Field Detail

      • bytes

        public byte[] bytes
        Internal byte array.
      • size

        public int size
        Size of the internal byte array used. Different from bytes.length, size will be <= bytes.length. Semantics of size is similar to java.util.Vector.size().
    • Constructor Detail

      • ByteArrayWrapper

        public ByteArrayWrapper()
        Construct a new ByteArrayWrapper with no data.
      • ByteArrayWrapper

        public ByteArrayWrapper​(byte[] bytesToAdopt,
                                int size)
        Construct a new ByteArrayWrapper from a byte array and size
        Parameters:
        bytesToAdopt - the byte array to adopt
        size - the length of valid data in the byte array
        Throws:
        IndexOutOfBoundsException - if bytesToAdopt == null and size != 0, or size < 0, or size > bytesToAdopt.length.
      • ByteArrayWrapper

        public ByteArrayWrapper​(ByteBuffer source)
        Construct a new ByteArrayWrapper from the contents of a ByteBuffer.
        Parameters:
        source - the ByteBuffer from which to get the data.
    • Method Detail

      • ensureCapacity

        public ByteArrayWrapper ensureCapacity​(int capacity)
        Ensure that the internal byte array is at least of length capacity. If the byte array is null or its length is less than capacity, a new byte array of length capacity will be allocated. The contents of the array (between 0 and size) remain unchanged.
        Parameters:
        capacity - minimum length of internal byte array.
        Returns:
        this ByteArrayWrapper
      • set

        public final ByteArrayWrapper set​(byte[] src,
                                          int start,
                                          int limit)
        Set the internal byte array from offset 0 to (limit - start) with the contents of src from offset start to limit. If the byte array is null or its length is less than capacity, a new byte array of length (limit - start) will be allocated. This resets the size of the internal byte array to (limit - start).
        Parameters:
        src - source byte array to copy from
        start - start offset of src to copy from
        limit - end + 1 offset of src to copy from
        Returns:
        this ByteArrayWrapper
      • append

        public final ByteArrayWrapper append​(byte[] src,
                                             int start,
                                             int limit)
        Appends the internal byte array from offset size with the contents of src from offset start to limit. This increases the size of the internal byte array to (size + limit - start).
        Parameters:
        src - source byte array to copy from
        start - start offset of src to copy from
        limit - end + 1 offset of src to copy from
        Returns:
        this ByteArrayWrapper
      • releaseBytes

        public final byte[] releaseBytes()
        Releases the internal byte array to the caller, resets the internal byte array to null and its size to 0.
        Returns:
        internal byte array.
      • toString

        public String toString()
        Returns string value for debugging
        Overrides:
        toString in class Object
      • equals

        public boolean equals​(Object other)
        Return true if the bytes in each wrapper are equal.
        Overrides:
        equals in class Object
        Parameters:
        other - the object to compare to.
        Returns:
        true if the two objects are equal.
      • hashCode

        public int hashCode()
        Return the hashcode.
        Overrides:
        hashCode in class Object
        Returns:
        the hashcode.
      • compareTo

        public int compareTo​(ByteArrayWrapper other)
        Compare this object to another ByteArrayWrapper, which must not be null.
        Specified by:
        compareTo in interface Comparable<ByteArrayWrapper>
        Parameters:
        other - the object to compare to.
        Returns:
        a value <0, 0, or >0 as this compares less than, equal to, or greater than other.
        Throws:
        ClassCastException - if the other object is not a ByteArrayWrapper