org.tensorics.core.tensor

Class Positions

java.lang.Object

org.tensorics.core.tensor.Positions

public final class Positions
extends java.lang.Object

Contains utility methods for position objects.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Positions.DimensionStripper A functional object to transform positions to other positions with the dimensions stripped as given in the constructor.

Method Summary

Modifier and Type	Method and Description
static boolean	areDimensionsConsistent(java.util.Set<java.lang.Class<?>> dimensions, java.util.Set<java.lang.Class<?>> positionCoordinatesToCheck)
static boolean	areDimensionsConsistentWithCoordinates(java.util.Set<java.lang.Class<?>> dimensions, Position position) Searches if given position coordinates match acceptable dimensions.
static void	assertConsistentDimensions(Position position, java.util.Set<java.lang.Class<?>> dimensions) Checks if the given position is conform with the given coordinate and throws an exception, if not.
static java.lang.Iterable<Position>	cartesianEnumProduct(java.lang.Class<?>... enumClasses) Returns all positions which can be built from the values of the passed in classes that are assumed to be enum classes.
static java.lang.Iterable<Position>	cartesianEnumProduct(java.util.Set<java.lang.Class<?>> classes) Returns all positions which can be built from the values of the passed in classes that are assumed to be enum classes.
static java.lang.Iterable<Position>	cartesianProduct(java.lang.Class<? extends java.lang.Enum<?>>... enumClasses) Returns all positions which can be built from all combinations of the values of the given enum classes.
static java.lang.Iterable<Position>	cartesianProduct(java.util.Set<java.lang.Class<? extends java.lang.Enum<?>>> enumClasses) Returns all positions which can be built from all combinations of the values of the given enum classes.
static com.google.common.collect.ImmutableSetMultimap<Position,PositionPair>	combineAll(java.util.Set<PositionPair> positionPairs, java.util.Set<java.lang.Class<?>> targetDimensions) Combines all position pairs into positions containing the given dimensions and returns a map from the combined positions to the original position pairs.
static Position	combineDimensions(PositionPair pair, java.util.Set<java.lang.Class<?>> targetDimensions) Combines the both positions of the pair in such a way, that for each coordinate of the types given in the given set of dimensions have to be either present in both positions of the pair, and then have to be the same or be present in only one of the both positions
static Position	combineDimensions(Position left, Position right, java.util.Set<java.lang.Class<?>> targetDimensions) Combines the both positions in such a way, that for each coordinate of the types given in the given set of dimensions have to be either present in both positions of the pair, and then have to be the same or be present in only one of the both positions
static <T> java.util.Set<T>	coordinatesOfType(java.util.Set<Position> positions, java.lang.Class<T> ofClass) Extracts the provided class of the coordinate from the set of the positions.
static Position	difference(Position left, Position right) Returns a position which contains the coordinates which are contained in the left position but not in the right position.
static java.lang.Iterable<Position>	from(java.lang.Class<? extends java.lang.Enum<?>> enumClass) Returns one position for each value of the given enum.
static com.google.common.collect.Multimap<Position,Position>	mapByStripping(java.lang.Iterable<Position> positions, java.util.Set<java.lang.Class<?>> dimensionsToStrip)
static <T> boolean	oneIsNull(T left, T right)
static Positions.DimensionStripper	strip(java.lang.Class<?> dimensionsToStrip) Convenience delegation method to stripping(Class), for a bit more fluent syntax.
static Positions.DimensionStripper	stripping(java.lang.Class<?> dimensionsToStrip) Factory method for a dimension stripper with one dimension to strip only
static Positions.DimensionStripper	stripping(java.util.Set<? extends java.lang.Class<?>> dimensionsToStrip) Factory method for a dimension stripper.
static Position	union(Position left, Position right) Constructs a position, whose coordinates are the union of the coordinates of the two individual positions.
static java.util.Set<Position>	unique(java.lang.Iterable<Position> positions) Copies the given positions to a set, to be sure that each element is contained only once

Methods inherited from class java.lang.Object

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

Method Detail

union

public static Position union(Position left,
                             Position right)

Constructs a position, whose coordinates are the union of the coordinates of the two individual positions. This is only correctly defined, if the two given positions do not have any dimensional overlap (i.e. Any coordinate of a certain type (class) is only present in either the left or the right position.)

Parameters:

left - the first position to use construct the union position

right - the second position to construct the union position

Returns:

a position, which contains the union of the coordinates of the two input positions.

Throws:

java.lang.NullPointerException - if one of the arguments is null

java.lang.IllegalArgumentException - if the given aguments have an overlap of dimensions and therefor the union of the position is not well defined

unique

public static java.util.Set<Position> unique(java.lang.Iterable<Position> positions)

Copies the given positions to a set, to be sure that each element is contained only once

Parameters:

positions - the positions, which shall be ensured that they are unique

Returns:

a set of unique positions

stripping

public static Positions.DimensionStripper stripping(java.util.Set<? extends java.lang.Class<?>> dimensionsToStrip)

Factory method for a dimension stripper.

Parameters:

dimensionsToStrip - the dimensions which shall be stripped from the positions passed to the stripper.

Returns:

a function object that can strip the given dimensions from positions.

stripping

public static Positions.DimensionStripper stripping(java.lang.Class<?> dimensionsToStrip)

Factory method for a dimension stripper with one dimension to strip only

Parameters:

dimensionsToStrip - the dimension to strip

Returns:

a dimension stripper stripping exactly one dimension

See Also:

stripping(Set)

strip

public static Positions.DimensionStripper strip(java.lang.Class<?> dimensionsToStrip)

Convenience delegation method to stripping(Class), for a bit more fluent syntax.

Parameters:

dimensionsToStrip - the dimension to strip

Returns:

a dimension stripper stripping exactly one dimension

See Also:

stripping(Class)

assertConsistentDimensions

public static void assertConsistentDimensions(Position position,
                                              java.util.Set<java.lang.Class<?>> dimensions)

Checks if the given position is conform with the given coordinate and throws an exception, if not.

Parameters:

position - the position for which to check the consistency

dimensions - the dimensions for which the conformity has to be verified.

Throws:

java.lang.IllegalArgumentException - if the position is not conform

See Also:

Position.isConsistentWith(Set)

areDimensionsConsistentWithCoordinates

public static boolean areDimensionsConsistentWithCoordinates(java.util.Set<java.lang.Class<?>> dimensions,
                                                             Position position)

Searches if given position coordinates match acceptable dimensions.

Parameters:

dimensions -

position -

Returns:

areDimensionsConsistent

public static boolean areDimensionsConsistent(java.util.Set<java.lang.Class<?>> dimensions,
                                              java.util.Set<java.lang.Class<?>> positionCoordinatesToCheck)

combineDimensions

public static Position combineDimensions(PositionPair pair,
                                         java.util.Set<java.lang.Class<?>> targetDimensions)

Combines the both positions of the pair in such a way, that for each coordinate of the types given in the given set of dimensions have to be

• either present in both positions of the pair, and then have to be the same
• or be present in only one of the both positions

Parameters:

pair - the pair, whose dimensions should be united

targetDimensions - the dimension in which the positions shall be united

Returns:

a new position, containing the coordinates of the pair, merged by the above rules

combineDimensions

public static Position combineDimensions(Position left,
                                         Position right,
                                         java.util.Set<java.lang.Class<?>> targetDimensions)

Combines the both positions in such a way, that for each coordinate of the types given in the given set of dimensions have to be

• either present in both positions of the pair, and then have to be the same
• or be present in only one of the both positions

Parameters:

left - the first of the two positions, whose dimensions should be united

right - the second of the two positions whose dimensions should be combined

targetDimensions - the dimension in which the positions shall be united

Returns:

a new position, with the coordinates merged according to the above rules

oneIsNull

public static <T> boolean oneIsNull(T left,
                                    T right)

combineAll

public static com.google.common.collect.ImmutableSetMultimap<Position,PositionPair> combineAll(java.util.Set<PositionPair> positionPairs,
                                                                                               java.util.Set<java.lang.Class<?>> targetDimensions)

Combines all position pairs into positions containing the given dimensions and returns a map from the combined positions to the original position pairs.

Parameters:

positionPairs - the position pairs to combine the final positions

targetDimensions - the dimensions in which to combine the positions

Returns:

a map from the combined dimensions to the original pairs

mapByStripping

public static com.google.common.collect.Multimap<Position,Position> mapByStripping(java.lang.Iterable<Position> positions,
                                                                                   java.util.Set<java.lang.Class<?>> dimensionsToStrip)

coordinatesOfType

public static <T> java.util.Set<T> coordinatesOfType(java.util.Set<Position> positions,
                                                     java.lang.Class<T> ofClass)

Extracts the provided class of the coordinate from the set of the positions.

Parameters:

positions -

ofClass - a class of the coordinate to be extracted

Returns:

a set of the extracted coordinates from provided positions

cartesianProduct

@SafeVarargs
public static final java.lang.Iterable<Position> cartesianProduct(java.lang.Class<? extends java.lang.Enum<?>>... enumClasses)

Returns all positions which can be built from all combinations of the values of the given enum classes.

Parameters:

enumClasses - the enum classes from which to get the values from

Returns:

positions containing all possible combinations of enum values

from

public static final java.lang.Iterable<Position> from(java.lang.Class<? extends java.lang.Enum<?>> enumClass)

Returns one position for each value of the given enum. Functionally, this is equivalent to cartesianProduct(Class...) with only one class given.

Parameters:

enumClass - the class of the enum from which to take the values as coordinates

Returns:

an iterable of positions, containing the values oif the given enum class as (one-dimensional) positions.

cartesianEnumProduct

public static final java.lang.Iterable<Position> cartesianEnumProduct(java.lang.Class<?>... enumClasses)

Returns all positions which can be built from the values of the passed in classes that are assumed to be enum classes. This is basically the runtime-checked version of cartesianProduct(Class...)

Parameters:

enumClasses - the enum classes from which to get their values

Returns:

an iterable containing the positions which are constructed from the values of the enums

Throws:

java.lang.IllegalArgumentException - in case not all clases are enums

cartesianProduct

public static java.lang.Iterable<Position> cartesianProduct(java.util.Set<java.lang.Class<? extends java.lang.Enum<?>>> enumClasses)

Returns all positions which can be built from all combinations of the values of the given enum classes.

Parameters:

enumClasses - the enums whose values will be used to create the positions

Returns:

an iterable with positions containing all possible combinations of the enum values

cartesianEnumProduct

public static java.lang.Iterable<Position> cartesianEnumProduct(java.util.Set<java.lang.Class<?>> classes)

Returns all positions which can be built from the values of the passed in classes that are assumed to be enum classes. This is basically the runtime-checked version of cartesianProduct(Set)

Parameters:

classes - the enum classes from which to get their values

Returns:

an iterable containing the positions which are constructed from the values of the enums

Throws:

java.lang.IllegalArgumentException - in case not all clases are enums

difference

public static final Position difference(Position left,
                                        Position right)

Returns a position which contains the coordinates which are contained in the left position but not in the right position. The right position might also contain coordinates not contained in the left position, which are simply ignored.

Parameters:

left - the position from which the coordinates of the right position shall be substracted

right - the position whose coordinates shall be substracted from the left position

Returns:

a position containing all coordinates from the left position, which are not present in the right position