Package org.h2.mvstore.type

Class StringDataType

  • All Implemented Interfaces:
    java.util.Comparator<java.lang.String>, DataType<java.lang.String>
    public class StringDataType
extends BasicDataType<java.lang.String>
    A string type.

    • Constructor Summary

      Constructors 
      Constructor Description
      StringDataType()  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int binarySearch​(java.lang.String key, java.lang.Object storageObj, int size, int initialGuess)
      Perform binary search for the key within the storage
      int compare​(java.lang.String a, java.lang.String b)
      Compare two keys.
      java.lang.String[] createStorage​(int size)
      Create storage object of array type to hold values
      int getMemory​(java.lang.String obj)
      Calculates the amount of used memory in bytes.
      java.lang.String read​(java.nio.ByteBuffer buff)
      Read an object.
      void write​(WriteBuffer buff, java.lang.String s)
      Write an object.

      • Methods inherited from class java.lang.Object

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

      • Methods inherited from interface java.util.Comparator

        reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

    • Field Detail

      • EMPTY_STRING_ARR

        private static final java.lang.String[] EMPTY_STRING_ARR

    • Constructor Detail

      • StringDataType

        public StringDataType()

    • Method Detail

      • createStorage

        public java.lang.String[] createStorage​(int size)
        Description copied from interface: DataType
        Create storage object of array type to hold values
        Parameters:
        size - number of values to hold
        Returns:
        storage object

      • compare

        public int compare​(java.lang.String a,
                   java.lang.String b)
        Description copied from interface: DataType
        Compare two keys.
        Specified by:
        compare in interface java.util.Comparator<java.lang.String>
        Specified by:
        compare in interface DataType<java.lang.String>
        Overrides:
        compare in class BasicDataType<java.lang.String>
        Parameters:
        a - the first key
        b - the second key
        Returns:
        -1 if the first key is smaller, 1 if larger, and 0 if equal

      • binarySearch

        public int binarySearch​(java.lang.String key,
                        java.lang.Object storageObj,
                        int size,
                        int initialGuess)
        Description copied from interface: DataType
        Perform binary search for the key within the storage
        Specified by:
        binarySearch in interface DataType<java.lang.String>
        Overrides:
        binarySearch in class BasicDataType<java.lang.String>
        Parameters:
        key - to search for
        storageObj - to search within (an array of type T)
        size - number of data items in the storage
        initialGuess - for key position
        Returns:
        index of the key , if found, - index of the insertion point, if not

      • getMemory

        public int getMemory​(java.lang.String obj)
        Description copied from interface: DataType
        Calculates the amount of used memory in bytes.
        Specified by:
        getMemory in interface DataType<java.lang.String>
        Specified by:
        getMemory in class BasicDataType<java.lang.String>
        Parameters:
        obj - the object
        Returns:
        the used memory

      • read

        public java.lang.String read​(java.nio.ByteBuffer buff)
        Description copied from interface: DataType
        Read an object.
        Specified by:
        read in interface DataType<java.lang.String>
        Specified by:
        read in class BasicDataType<java.lang.String>
        Parameters:
        buff - the source buffer
        Returns:
        the object

      • write

        public void write​(WriteBuffer buff,
                  java.lang.String s)
        Description copied from interface: DataType
        Write an object.
        Specified by:
        write in interface DataType<java.lang.String>
        Specified by:
        write in class BasicDataType<java.lang.String>
        Parameters:
        buff - the target buffer
        s - the value