Class FixedWidthLongListLabel

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

    public class FixedWidthLongListLabel
    extends AbstractLongListLabel
    A list of longs represented in fixed width. The provided width must be smaller than 64. Each list is prefixed by its length written in γ coding.
    • Constructor Detail

      • FixedWidthLongListLabel

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

        public FixedWidthLongListLabel​(java.lang.String key,
                                       int width)
        Creates a new fixed-width label with an empty list.
        Parameters:
        key - the (only) key of this label.
        width - the label width (in bits).
      • FixedWidthLongListLabel

        public FixedWidthLongListLabel​(java.lang.String... arg)
        Creates a new fixed-width long label using the given key and width with an empty list.
        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,
                                 long 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,
                               long 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 -1 (the fixed width refers to a single long, not to the entire list).
        Returns:
        -1;
      • 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)