Class FixedWidthIntLabel

  • All Implemented Interfaces:
    it.unimi.dsi.lang.FlyweightPrototype<Label>, Label

    public class FixedWidthIntLabel
    extends AbstractIntLabel
    An integer represented in fixed width. The provided width must be smaller than 32.
    • Field Detail

      • width

        protected final int width
        The bit width used to represent the value of this label.
    • Constructor Detail

      • FixedWidthIntLabel

        public FixedWidthIntLabel​(java.lang.String key,
                                  int width,
                                  int value)
        Creates a new fixed-width int label.
        Parameters:
        key - the (only) key of this label.
        width - the label width (in bits).
        value - the value of this label.
      • FixedWidthIntLabel

        public FixedWidthIntLabel​(java.lang.String key,
                                  int width)
        Creates a new fixed-width int label of value 0.
        Parameters:
        key - the (only) key of this label.
        width - the label width (in bits).
      • FixedWidthIntLabel

        public FixedWidthIntLabel​(java.lang.String... arg)
        Creates a new fixed-width integer label using the given key and width with value 0.
        Parameters:
        arg - two strings containing the key and the width of this label.
    • Method Detail

      • copy

        public Label copy()
        Description copied from interface: Label
        Returns a copy of this label.
        Returns:
        a new label that copies this one.
      • fromBitStream

        public int fromBitStream​(it.unimi.dsi.io.InputBitStream inputBitStream,
                                 int sourceUnused)
                          throws java.io.IOException
        Description copied from interface: Label
        Fills this label with data from the given input bit stream, knowing the source node of the arc. If Label.fixedWidth() is not negative, the value returned must coincide with Label.fixedWidth(). This method is optional.
        Parameters:
        inputBitStream - an input bit stream offering a label.
        sourceUnused - the source node.
        Returns:
        the number of bits read to fill this label.
        Throws:
        java.io.IOException
      • toBitStream

        public int toBitStream​(it.unimi.dsi.io.OutputBitStream outputBitStream,
                               int sourceUnused)
                        throws java.io.IOException
        Description copied from interface: Label
        Writes out this label to the given input bit stream, in self-delimiting form, knowing the source node of the arc. If Label.fixedWidth() is not negative, the value returned must coincide with Label.fixedWidth(). This method is optional.
        Parameters:
        outputBitStream - an output bit stream where the label will be written.
        sourceUnused - the source node.
        Returns:
        the number of bits written.
        Throws:
        java.io.IOException
      • fixedWidth

        public int fixedWidth()
        Returns the width of this label (as provided at construction time).
        Returns:
        the width of this label.
      • toSpec

        public java.lang.String toSpec()
        Description copied from interface: Label
        Returns a string representing the specification of this label.

        Each label class can be instantiated in several ways (e.g., FixedWidthIntLabel requires a name for the well-known attribute and a number of bits). This method must return a representation that can be used by ObjectParser to instantiate the class, and consequently there must exist a matching constructor whose arguments are strings.

        There is an equation that must be always satisfied:

         ObjectParser.fromSpec(x.toSpec()).toSpec().equals(x.toSpec())
         
        Returns:
        a string representing the specification of this label.
        See Also:
        ObjectParser.fromSpec(String, Class)