Package it.unimi.dsi.webgraph.labelling
Class FixedWidthIntListLabel
java.lang.Object
it.unimi.dsi.webgraph.labelling.AbstractLabel
it.unimi.dsi.webgraph.labelling.AbstractIntListLabel
it.unimi.dsi.webgraph.labelling.FixedWidthIntListLabel
A list of integers represented in fixed width. The provided width must
be smaller than 32. Each list is prefixed by its length written
in γ coding.
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Field Summary
Fields inherited from class it.unimi.dsi.webgraph.labelling.AbstractIntListLabel
key, valueFields inherited from interface it.unimi.dsi.webgraph.labelling.Label
EMPTY_LABEL_ARRAY -
Constructor Summary
ConstructorsConstructorDescriptionFixedWidthIntListLabel(String... arg) Creates a new fixed-width integer label using the given key and width with an empty list.FixedWidthIntListLabel(String key, int width) Creates a new fixed-width label with an empty list.FixedWidthIntListLabel(String key, int width, int[] value) Creates a new fixed-width int label. -
Method Summary
Modifier and TypeMethodDescriptioncopy()Returns a copy of this label.intReturns -1 (the fixed width refers to a single integer, not to the entire list).intfromBitStream(it.unimi.dsi.io.InputBitStream inputBitStream, int sourceUnused) Fills this label with data from the given input bit stream, knowing the source node of the arc.inttoBitStream(it.unimi.dsi.io.OutputBitStream outputBitStream, int sourceUnused) Writes out this label to the given input bit stream, in self-delimiting form, knowing the source node of the arc.toSpec()Returns a string representing the specification of this label.toString()Methods inherited from class it.unimi.dsi.webgraph.labelling.AbstractIntListLabel
attributeKeys, attributeTypes, equals, get, get, hashCode, wellKnownAttributeKeyMethods inherited from class it.unimi.dsi.webgraph.labelling.AbstractLabel
getBoolean, getBoolean, getByte, getByte, getChar, getChar, getDouble, getDouble, getFloat, getFloat, getInt, getInt, getLong, getLong, getShort, getShort
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Constructor Details
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FixedWidthIntListLabel
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.
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FixedWidthIntListLabel
Creates a new fixed-width label with an empty list.- Parameters:
key- the (only) key of this label.width- the label width (in bits).
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FixedWidthIntListLabel
Creates a new fixed-width integer label using the given key and width with an empty list.- Parameters:
arg- two strings containing the key and the width of this label.
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Method Details
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copy
Description copied from interface:LabelReturns a copy of this label.- Returns:
- a new label that copies this one.
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fromBitStream
public int fromBitStream(it.unimi.dsi.io.InputBitStream inputBitStream, int sourceUnused) throws IOException Description copied from interface:LabelFills this label with data from the given input bit stream, knowing the source node of the arc. IfLabel.fixedWidth()is not negative, the value returned must coincide withLabel.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:
IOException
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toBitStream
public int toBitStream(it.unimi.dsi.io.OutputBitStream outputBitStream, int sourceUnused) throws IOException Description copied from interface:LabelWrites out this label to the given input bit stream, in self-delimiting form, knowing the source node of the arc. IfLabel.fixedWidth()is not negative, the value returned must coincide withLabel.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:
IOException
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fixedWidth
public int fixedWidth()Returns -1 (the fixed width refers to a single integer, not to the entire list).- Returns:
- -1;
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toString
- Overrides:
toStringin classAbstractIntListLabel
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toSpec
Description copied from interface:LabelReturns a string representing the specification of this label.Each label class can be instantiated in several ways (e.g.,
FixedWidthIntLabelrequires a name for the well-known attribute and a number of bits). This method must return a representation that can be used byObjectParserto 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:
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