org.apache.solr.analytics.function.mapping

Class LambdaFunction

java.lang.Object

org.apache.solr.analytics.function.mapping.LambdaFunction

public class LambdaFunction
extends Object

Lambda Functions are used to easily create basic mapping functions.

There are lambda functions for all types: boolean, int, long, float, double, date and string. Lambda functions must have parameters of all the same type, which will be the same type as the returned Value or ValueStream.

The types of functions that are accepted are: (multi = multi-valued expression, single = single-valued expression)

• func(single) -> single
• func(multi) -> multi
• func(single,single) -> single
• func(multi,single) -> multi
• func(single,multi) -> multi
• func(multi) -> single
• func(single,single,...) -> single (You can also specify whether all parameters must exist, or at least one must exist for the returned value to exist)

NOTE: The combination of name and parameters MUST be unique for an expression.
For example consider if join(fieldA, ',') and join(fieldA, ';') are both called. If the JoinFunction uses:
LambdaFunction.createStringLambdaFunction("join", (a,b) -> a + sep + b, (StringValueStream)params[0])
then both the name "join" and single parameter fieldA will be used for two DIFFERENT expressions. This does not meet the uniqueness requirmenet and will break the query.
A solution to this is to name the function using the missing information:
LambdaFunction.createStringLambdaFunction("join(" + sep + ")", (a,b) -> a + sep + b, (StringValueStream)params[0])
Therefore both expressions will have fieldA as the only parameter, but the names "join(,)" and "join(;)" will be different. This meets the uniqueness requirement for lambda functions.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	LambdaFunction.BoolInBoolOutLambda
static interface	LambdaFunction.BoolInDoubleOutLambda
static interface	LambdaFunction.BoolInFloatOutLambda
static interface	LambdaFunction.BoolInIntOutLambda
static interface	LambdaFunction.BoolInLongOutLambda
static interface	LambdaFunction.BoolInStringOutLambda
static interface	LambdaFunction.DoubleInBoolOutLambda
static interface	LambdaFunction.DoubleInDoubleOutLambda
static interface	LambdaFunction.DoubleInFloatOutLambda
static interface	LambdaFunction.DoubleInIntOutLambda
static interface	LambdaFunction.DoubleInLongOutLambda
static interface	LambdaFunction.DoubleInStringOutLambda
static interface	LambdaFunction.FloatInBoolOutLambda
static interface	LambdaFunction.FloatInDoubleOutLambda
static interface	LambdaFunction.FloatInFloatOutLambda
static interface	LambdaFunction.FloatInIntOutLambda
static interface	LambdaFunction.FloatInLongOutLambda
static interface	LambdaFunction.FloatInStringOutLambda
static interface	LambdaFunction.IntInBoolOutLambda
static interface	LambdaFunction.IntInDoubleOutLambda
static interface	LambdaFunction.IntInFloatOutLambda
static interface	LambdaFunction.IntInIntOutLambda
static interface	LambdaFunction.IntInLongOutLambda
static interface	LambdaFunction.IntInStringOutLambda
static interface	LambdaFunction.LongInBoolOutLambda
static interface	LambdaFunction.LongInDoubleOutLambda
static interface	LambdaFunction.LongInFloatOutLambda
static interface	LambdaFunction.LongInIntOutLambda
static interface	LambdaFunction.LongInLongOutLambda
static interface	LambdaFunction.LongInStringOutLambda
static interface	LambdaFunction.StringInBoolOutLambda
static interface	LambdaFunction.StringInDoubleOutLambda
static interface	LambdaFunction.StringInFloatOutLambda
static interface	LambdaFunction.StringInIntOutLambda
static interface	LambdaFunction.StringInLongOutLambda
static interface	LambdaFunction.StringInStringOutLambda
static interface	LambdaFunction.TwoBoolInBoolOutLambda
static interface	LambdaFunction.TwoBoolInDoubleOutLambda
static interface	LambdaFunction.TwoBoolInFloatOutLambda
static interface	LambdaFunction.TwoBoolInIntOutLambda
static interface	LambdaFunction.TwoBoolInLongOutLambda
static interface	LambdaFunction.TwoBoolInStringOutLambda
static interface	LambdaFunction.TwoDoubleInBoolOutLambda
static interface	LambdaFunction.TwoDoubleInDoubleOutLambda
static interface	LambdaFunction.TwoDoubleInFloatOutLambda
static interface	LambdaFunction.TwoDoubleInIntOutLambda
static interface	LambdaFunction.TwoDoubleInLongOutLambda
static interface	LambdaFunction.TwoDoubleInStringOutLambda
static interface	LambdaFunction.TwoFloatInBoolOutLambda
static interface	LambdaFunction.TwoFloatInDoubleOutLambda
static interface	LambdaFunction.TwoFloatInFloatOutLambda
static interface	LambdaFunction.TwoFloatInIntOutLambda
static interface	LambdaFunction.TwoFloatInLongOutLambda
static interface	LambdaFunction.TwoFloatInStringOutLambda
static interface	LambdaFunction.TwoIntInBoolOutLambda
static interface	LambdaFunction.TwoIntInDoubleOutLambda
static interface	LambdaFunction.TwoIntInFloatOutLambda
static interface	LambdaFunction.TwoIntInIntOutLambda
static interface	LambdaFunction.TwoIntInLongOutLambda
static interface	LambdaFunction.TwoIntInStringOutLambda
static interface	LambdaFunction.TwoLongInBoolOutLambda
static interface	LambdaFunction.TwoLongInDoubleOutLambda
static interface	LambdaFunction.TwoLongInFloatOutLambda
static interface	LambdaFunction.TwoLongInIntOutLambda
static interface	LambdaFunction.TwoLongInLongOutLambda
static interface	LambdaFunction.TwoLongInStringOutLambda
static interface	LambdaFunction.TwoStringInBoolOutLambda
static interface	LambdaFunction.TwoStringInDoubleOutLambda
static interface	LambdaFunction.TwoStringInFloatOutLambda
static interface	LambdaFunction.TwoStringInIntOutLambda
static interface	LambdaFunction.TwoStringInLongOutLambda
static interface	LambdaFunction.TwoStringInStringOutLambda

Constructor Summary

Constructors

Constructor and Description
LambdaFunction()

Method Summary

Modifier and Type	Method and Description
static BooleanValueStream	createBooleanLambdaFunction(String name, LambdaFunction.BoolInBoolOutLambda lambda, BooleanValueStream param) Creates a function that takes in either a single or multi valued boolean expression and returns the same type of expression with the given lambda function applied to every value.
static BooleanValue	createBooleanLambdaFunction(String name, LambdaFunction.TwoBoolInBoolOutLambda lambda, BooleanValue[] params) Forwards the creation of the function to createBooleanLambdaFunction(String, TwoBoolInBoolOutLambda, BooleanValue[], boolean), using for the last argument (allMustExist).
static BooleanValue	createBooleanLambdaFunction(String name, LambdaFunction.TwoBoolInBoolOutLambda lambda, BooleanValue[] params, boolean allMustExist) Creates a function that associatively (order is guaranteed) reduces multiple single-value boolean expressions into a single-value boolean expression for each document.
static BooleanValue	createBooleanLambdaFunction(String name, LambdaFunction.TwoBoolInBoolOutLambda lambda, BooleanValueStream param) Creates a function that takes in a multi-valued boolean expression and returns a single-valued boolean expression.
static BooleanValueStream	createBooleanLambdaFunction(String name, LambdaFunction.TwoBoolInBoolOutLambda lambda, BooleanValueStream param1, BooleanValueStream param2) Creates a function that maps two booleans to a single boolean.
static DateValueStream	createDateLambdaFunction(String name, LambdaFunction.LongInLongOutLambda lambda, DateValueStream param) Creates a function that takes in either a single or multi valued date expression and returns the same type of expression with the given lambda function applied to every value.
static DateValue	createDateLambdaFunction(String name, LambdaFunction.TwoLongInLongOutLambda lambda, DateValue[] params) Forwards the creation of the function to createDateLambdaFunction(String, TwoLongInLongOutLambda, DateValue[], boolean), using for the last argument (allMustExist).
static DateValue	createDateLambdaFunction(String name, LambdaFunction.TwoLongInLongOutLambda lambda, DateValue[] params, boolean allMustExist) Creates a function that associatively (order is guaranteed) reduces multiple single-value date expressions into a single-value date expression for each document.
static DateValue	createDateLambdaFunction(String name, LambdaFunction.TwoLongInLongOutLambda lambda, DateValueStream param) Creates a function that takes in a multi-valued date expression and returns a single-valued date expression.
static DateValueStream	createDateLambdaFunction(String name, LambdaFunction.TwoLongInLongOutLambda lambda, DateValueStream param1, DateValueStream param2) Creates a function that maps two dates to a single date.
static DoubleValueStream	createDoubleLambdaFunction(String name, LambdaFunction.DoubleInDoubleOutLambda lambda, DoubleValueStream param) Creates a function that takes in either a single or multi valued double expression and returns the same type of expression with the given lambda function applied to every value.
static DoubleValue	createDoubleLambdaFunction(String name, LambdaFunction.TwoDoubleInDoubleOutLambda lambda, DoubleValue[] params) Forwards the creation of the function to createDoubleLambdaFunction(String, TwoDoubleInDoubleOutLambda, DoubleValue[], boolean), using for the last argument (allMustExist).
static DoubleValue	createDoubleLambdaFunction(String name, LambdaFunction.TwoDoubleInDoubleOutLambda lambda, DoubleValue[] params, boolean allMustExist) Creates a function that associatively (order is guaranteed) reduces multiple single-value double expressions into a single-value double expression for each document.
static DoubleValue	createDoubleLambdaFunction(String name, LambdaFunction.TwoDoubleInDoubleOutLambda lambda, DoubleValueStream param) Creates a function that takes in a multi-valued double expression and returns a single-valued double expression.
static DoubleValueStream	createDoubleLambdaFunction(String name, LambdaFunction.TwoDoubleInDoubleOutLambda lambda, DoubleValueStream param1, DoubleValueStream param2) Creates a function that maps two doubles to a single double.
static FloatValueStream	createFloatLambdaFunction(String name, LambdaFunction.FloatInFloatOutLambda lambda, FloatValueStream param) Creates a function that takes in either a single or multi valued float expression and returns the same type of expression with the given lambda function applied to every value.
static FloatValue	createFloatLambdaFunction(String name, LambdaFunction.TwoFloatInFloatOutLambda lambda, FloatValue[] params) Forwards the creation of the function to createFloatLambdaFunction(String, TwoFloatInFloatOutLambda, FloatValue[], boolean), using for the last argument (allMustExist).
static FloatValue	createFloatLambdaFunction(String name, LambdaFunction.TwoFloatInFloatOutLambda lambda, FloatValue[] params, boolean allMustExist) Creates a function that associatively (order is guaranteed) reduces multiple single-value float expressions into a single-value float expression for each document.
static FloatValue	createFloatLambdaFunction(String name, LambdaFunction.TwoFloatInFloatOutLambda lambda, FloatValueStream param) Creates a function that takes in a multi-valued float expression and returns a single-valued float expression.
static FloatValueStream	createFloatLambdaFunction(String name, LambdaFunction.TwoFloatInFloatOutLambda lambda, FloatValueStream param1, FloatValueStream param2) Creates a function that maps two floats to a single float.
static IntValueStream	createIntLambdaFunction(String name, LambdaFunction.IntInIntOutLambda lambda, IntValueStream param) Creates a function that takes in either a single or multi valued integer expression and returns the same type of expression with the given lambda function applied to every value.
static IntValue	createIntLambdaFunction(String name, LambdaFunction.TwoIntInIntOutLambda lambda, IntValue[] params) Forwards the creation of the function to createIntLambdaFunction(String, TwoIntInIntOutLambda, IntValue[], boolean), using for the last argument (allMustExist).
static IntValue	createIntLambdaFunction(String name, LambdaFunction.TwoIntInIntOutLambda lambda, IntValue[] params, boolean allMustExist) Creates a function that associatively (order is guaranteed) reduces multiple single-value integer expressions into a single-value integer expression for each document.
static IntValue	createIntLambdaFunction(String name, LambdaFunction.TwoIntInIntOutLambda lambda, IntValueStream param) Creates a function that takes in a multi-valued integer expression and returns a single-valued integer expression.
static IntValueStream	createIntLambdaFunction(String name, LambdaFunction.TwoIntInIntOutLambda lambda, IntValueStream param1, IntValueStream param2) Creates a function that maps two integers to a single integer.
static LongValueStream	createLongLambdaFunction(String name, LambdaFunction.LongInLongOutLambda lambda, LongValueStream param) Creates a function that takes in either a single or multi valued long expression and returns the same type of expression with the given lambda function applied to every value.
static LongValue	createLongLambdaFunction(String name, LambdaFunction.TwoLongInLongOutLambda lambda, LongValue[] params) Forwards the creation of the function to createLongLambdaFunction(String, TwoLongInLongOutLambda, LongValue[], boolean), using for the last argument (allMustExist).
static LongValue	createLongLambdaFunction(String name, LambdaFunction.TwoLongInLongOutLambda lambda, LongValue[] params, boolean allMustExist) Creates a function that associatively (order is guaranteed) reduces multiple single-value long expressions into a single-value long expression for each document.
static LongValue	createLongLambdaFunction(String name, LambdaFunction.TwoLongInLongOutLambda lambda, LongValueStream param) Creates a function that takes in a multi-valued long expression and returns a single-valued long expression.
static LongValueStream	createLongLambdaFunction(String name, LambdaFunction.TwoLongInLongOutLambda lambda, LongValueStream param1, LongValueStream param2) Creates a function that maps two longs to a single long.
static StringValueStream	createStringLambdaFunction(String name, LambdaFunction.StringInStringOutLambda lambda, StringValueStream param) Creates a function that takes in either a single or multi valued string expression and returns the same type of expression with the given lambda function applied to every value.
static StringValue	createStringLambdaFunction(String name, LambdaFunction.TwoStringInStringOutLambda lambda, StringValue[] params) Forwards the creation of the function to createStringLambdaFunction(String, TwoStringInStringOutLambda, StringValue[], boolean), using for the last argument (allMustExist).
static StringValue	createStringLambdaFunction(String name, LambdaFunction.TwoStringInStringOutLambda lambda, StringValue[] params, boolean allMustExist) Creates a function that associatively (order is guaranteed) reduces multiple single-value string expressions into a single-value string expression for each document.
static StringValue	createStringLambdaFunction(String name, LambdaFunction.TwoStringInStringOutLambda lambda, StringValueStream param) Creates a function that takes in a multi-valued string expression and returns a single-valued string expression.
static StringValueStream	createStringLambdaFunction(String name, LambdaFunction.TwoStringInStringOutLambda lambda, StringValueStream param1, StringValueStream param2) Creates a function that maps two strings to a single string.

Methods inherited from class java.lang.Object

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

Constructor Detail

LambdaFunction

public LambdaFunction()

Method Detail

createBooleanLambdaFunction

public static BooleanValueStream createBooleanLambdaFunction(String name,
                                                             LambdaFunction.BoolInBoolOutLambda lambda,
                                                             BooleanValueStream param)

Creates a function that takes in either a single or multi valued boolean expression and returns the same type of expression with the given lambda function applied to every value.

Parameters:

name - name for the function

lambda - the function to be applied to every value: (boolean) -> boolean

param - the expression to apply the lambda to

Returns:

an expression the same type as was given with the lambda applied

createBooleanLambdaFunction

public static BooleanValue createBooleanLambdaFunction(String name,
                                                       LambdaFunction.TwoBoolInBoolOutLambda lambda,
                                                       BooleanValueStream param)

Creates a function that takes in a multi-valued boolean expression and returns a single-valued boolean expression. The given lambda is used to associatively (order not guaranteed) reduce all values for a document down to a single value.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (boolean, boolean) -> boolean

param - the expression to be reduced per-document

Returns:

a single-valued expression which has been reduced for every document

createBooleanLambdaFunction

public static BooleanValueStream createBooleanLambdaFunction(String name,
                                                             LambdaFunction.TwoBoolInBoolOutLambda lambda,
                                                             BooleanValueStream param1,
                                                             BooleanValueStream param2)
                                                      throws SolrException

Creates a function that maps two booleans to a single boolean. This can take the following shapes:

• Taking in two single-valued expressions and returning a single-valued expression which represents the lambda combination of the inputs.
• Taking in a single-valued expression and a multi-valued expression and returning a multi-valued expression which represents the lambda combination of the single-value input with each of the values of the multi-value input.
  The inputs can be either func(single,multi) or func(multi,single).

Parameters:

name - name for the function

lambda - the function to be applied to every value: (boolean,boolean) -> boolean

param1 - the first parameter in the lambda

param2 - the second parameter in the lambda

Returns:

a single or multi valued expression combining the two parameters with the given lambda

Throws:

SolrException - if neither parameter is single-valued

createBooleanLambdaFunction

public static BooleanValue createBooleanLambdaFunction(String name,
                                                       LambdaFunction.TwoBoolInBoolOutLambda lambda,
                                                       BooleanValue[] params)

Forwards the creation of the function to createBooleanLambdaFunction(String, TwoBoolInBoolOutLambda, BooleanValue[], boolean), using for the last argument (allMustExist).

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (boolean, boolean) -> boolean

params - the expressions to reduce

Returns:

a single-value expression that reduces the parameters with the given lambda

createBooleanLambdaFunction

public static BooleanValue createBooleanLambdaFunction(String name,
                                                       LambdaFunction.TwoBoolInBoolOutLambda lambda,
                                                       BooleanValue[] params,
                                                       boolean allMustExist)

Creates a function that associatively (order is guaranteed) reduces multiple single-value boolean expressions into a single-value boolean expression for each document.
For a document, every parameter's value must exist for the resulting value to exist if allMustExist is true. If allMustExist is false, only one of the parameters' values must exist.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (boolean, boolean) -> boolean

params - the expressions to reduce

allMustExist - whether all parameters are required to exist

Returns:

a single-value expression that reduces the parameters with the given lambda

createIntLambdaFunction

public static IntValueStream createIntLambdaFunction(String name,
                                                     LambdaFunction.IntInIntOutLambda lambda,
                                                     IntValueStream param)

Creates a function that takes in either a single or multi valued integer expression and returns the same type of expression with the given lambda function applied to every value.

Parameters:

name - name for the function

lambda - the function to be applied to every value: (integer) -> integer

param - the expression to apply the lambda to

Returns:

an expression the same type as was given with the lambda applied

createIntLambdaFunction

public static IntValue createIntLambdaFunction(String name,
                                               LambdaFunction.TwoIntInIntOutLambda lambda,
                                               IntValueStream param)

Creates a function that takes in a multi-valued integer expression and returns a single-valued integer expression. The given lambda is used to associatively (order not guaranteed) reduce all values for a document down to a single value.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (integer, integer) -> integer

param - the expression to be reduced per-document

Returns:

a single-valued expression which has been reduced for every document

createIntLambdaFunction

public static IntValueStream createIntLambdaFunction(String name,
                                                     LambdaFunction.TwoIntInIntOutLambda lambda,
                                                     IntValueStream param1,
                                                     IntValueStream param2)
                                              throws SolrException

Creates a function that maps two integers to a single integer. This can take the following shapes:

• Taking in two single-valued expressions and returning a single-valued expression which represents the lambda combination of the inputs.
• Taking in a single-valued expression and a multi-valued expression and returning a multi-valued expression which represents the lambda combination of the single-value input with each of the values of the multi-value input.
  The inputs can be either func(single,multi) or func(multi,single).

Parameters:

name - name for the function

lambda - the function to be applied to every value: (integer,integer) -> integer

param1 - the first parameter in the lambda

param2 - the second parameter in the lambda

Returns:

a single or multi valued expression combining the two parameters with the given lambda

Throws:

SolrException - if neither parameter is single-valued

createIntLambdaFunction

public static IntValue createIntLambdaFunction(String name,
                                               LambdaFunction.TwoIntInIntOutLambda lambda,
                                               IntValue[] params)

Forwards the creation of the function to createIntLambdaFunction(String, TwoIntInIntOutLambda, IntValue[], boolean), using for the last argument (allMustExist).

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (boolean, boolean) -> boolean

params - the expressions to reduce

Returns:

a single-value expression that reduces the parameters with the given lambda

createIntLambdaFunction

public static IntValue createIntLambdaFunction(String name,
                                               LambdaFunction.TwoIntInIntOutLambda lambda,
                                               IntValue[] params,
                                               boolean allMustExist)

Creates a function that associatively (order is guaranteed) reduces multiple single-value integer expressions into a single-value integer expression for each document.
For a document, every parameter's value must exist for the resulting value to exist if allMustExist is true. If allMustExist is false, only one of the parameters' values must exist.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (integer, integer) -> integer

params - the expressions to reduce

allMustExist - whether all parameters are required to exist

Returns:

a single-value expression that reduces the parameters with the given lambda

createLongLambdaFunction

public static LongValueStream createLongLambdaFunction(String name,
                                                       LambdaFunction.LongInLongOutLambda lambda,
                                                       LongValueStream param)

Creates a function that takes in either a single or multi valued long expression and returns the same type of expression with the given lambda function applied to every value.

Parameters:

name - name for the function

lambda - the function to be applied to every value: (long) -> long

param - the expression to apply the lambda to

Returns:

an expression the same type as was given with the lambda applied

createLongLambdaFunction

public static LongValue createLongLambdaFunction(String name,
                                                 LambdaFunction.TwoLongInLongOutLambda lambda,
                                                 LongValueStream param)

Creates a function that takes in a multi-valued long expression and returns a single-valued long expression. The given lambda is used to associatively (order not guaranteed) reduce all values for a document down to a single value.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (boolean, boolean) -> boolean

param - the expression to be reduced per-document

Returns:

a single-valued expression which has been reduced for every document

createLongLambdaFunction

public static LongValueStream createLongLambdaFunction(String name,
                                                       LambdaFunction.TwoLongInLongOutLambda lambda,
                                                       LongValueStream param1,
                                                       LongValueStream param2)
                                                throws SolrException

Creates a function that maps two longs to a single long. This can take the following shapes:

• Taking in two single-valued expressions and returning a single-valued expression which represents the lambda combination of the inputs.
• Taking in a single-valued expression and a multi-valued expression and returning a multi-valued expression which represents the lambda combination of the single-value input with each of the values of the multi-value input.
  The inputs can be either func(single,multi) or func(multi,single).

Parameters:

name - name for the function

lambda - the function to be applied to every value: (long,long) -> long

param1 - the first parameter in the lambda

param2 - the second parameter in the lambda

Returns:

a single or multi valued expression combining the two parameters with the given lambda

Throws:

SolrException - if neither parameter is single-valued

createLongLambdaFunction

public static LongValue createLongLambdaFunction(String name,
                                                 LambdaFunction.TwoLongInLongOutLambda lambda,
                                                 LongValue[] params)

Forwards the creation of the function to createLongLambdaFunction(String, TwoLongInLongOutLambda, LongValue[], boolean), using for the last argument (allMustExist).

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (boolean, boolean) -> boolean

params - the expressions to reduce

Returns:

a single-value expression that reduces the parameters with the given lambda

createLongLambdaFunction

public static LongValue createLongLambdaFunction(String name,
                                                 LambdaFunction.TwoLongInLongOutLambda lambda,
                                                 LongValue[] params,
                                                 boolean allMustExist)

Creates a function that associatively (order is guaranteed) reduces multiple single-value long expressions into a single-value long expression for each document.
For a document, every parameter's value must exist for the resulting value to exist if allMustExist is true. If allMustExist is false, only one of the parameters' values must exist.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (long, long) -> long

params - the expressions to reduce

allMustExist - whether all parameters are required to exist

Returns:

a single-value expression that reduces the parameters with the given lambda

createFloatLambdaFunction

public static FloatValueStream createFloatLambdaFunction(String name,
                                                         LambdaFunction.FloatInFloatOutLambda lambda,
                                                         FloatValueStream param)

Creates a function that takes in either a single or multi valued float expression and returns the same type of expression with the given lambda function applied to every value.

Parameters:

name - name for the function

lambda - the function to be applied to every value: (float) -> float

param - the expression to apply the lambda to

Returns:

an expression the same type as was given with the lambda applied

createFloatLambdaFunction

public static FloatValue createFloatLambdaFunction(String name,
                                                   LambdaFunction.TwoFloatInFloatOutLambda lambda,
                                                   FloatValueStream param)

Creates a function that takes in a multi-valued float expression and returns a single-valued float expression. The given lambda is used to associatively (order not guaranteed) reduce all values for a document down to a single value.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (float, float) -> float

param - the expression to be reduced per-document

Returns:

a single-valued expression which has been reduced for every document

createFloatLambdaFunction

public static FloatValueStream createFloatLambdaFunction(String name,
                                                         LambdaFunction.TwoFloatInFloatOutLambda lambda,
                                                         FloatValueStream param1,
                                                         FloatValueStream param2)
                                                  throws SolrException

Creates a function that maps two floats to a single float. This can take the following shapes:

• Taking in two single-valued expressions and returning a single-valued expression which represents the lambda combination of the inputs.
• Taking in a single-valued expression and a multi-valued expression and returning a multi-valued expression which represents the lambda combination of the single-value input with each of the values of the multi-value input.
  The inputs can be either func(single,multi) or func(multi,single).

Parameters:

name - name for the function

lambda - the function to be applied to every value: (float,float) -> float

param1 - the first parameter in the lambda

param2 - the second parameter in the lambda

Returns:

a single or multi valued expression combining the two parameters with the given lambda

Throws:

SolrException - if neither parameter is single-valued

createFloatLambdaFunction

public static FloatValue createFloatLambdaFunction(String name,
                                                   LambdaFunction.TwoFloatInFloatOutLambda lambda,
                                                   FloatValue[] params)

Forwards the creation of the function to createFloatLambdaFunction(String, TwoFloatInFloatOutLambda, FloatValue[], boolean), using for the last argument (allMustExist).

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (boolean, boolean) -> boolean

params - the expressions to reduce

Returns:

a single-value expression that reduces the parameters with the given lambda

createFloatLambdaFunction

public static FloatValue createFloatLambdaFunction(String name,
                                                   LambdaFunction.TwoFloatInFloatOutLambda lambda,
                                                   FloatValue[] params,
                                                   boolean allMustExist)

Creates a function that associatively (order is guaranteed) reduces multiple single-value float expressions into a single-value float expression for each document.
For a document, every parameter's value must exist for the resulting value to exist if allMustExist is true. If allMustExist is false, only one of the parameters' values must exist.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (float, float) -> float

params - the expressions to reduce

allMustExist - whether all parameters are required to exist

Returns:

a single-value expression that reduces the parameters with the given lambda

createDoubleLambdaFunction

public static DoubleValueStream createDoubleLambdaFunction(String name,
                                                           LambdaFunction.DoubleInDoubleOutLambda lambda,
                                                           DoubleValueStream param)

Creates a function that takes in either a single or multi valued double expression and returns the same type of expression with the given lambda function applied to every value.

Parameters:

name - name for the function

lambda - the function to be applied to every value: (double) -> double

param - the expression to apply the lambda to

Returns:

an expression the same type as was given with the lambda applied

createDoubleLambdaFunction

public static DoubleValue createDoubleLambdaFunction(String name,
                                                     LambdaFunction.TwoDoubleInDoubleOutLambda lambda,
                                                     DoubleValueStream param)

Creates a function that takes in a multi-valued double expression and returns a single-valued double expression. The given lambda is used to associatively (order not guaranteed) reduce all values for a document down to a single value.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (double, double) -> double

param - the expression to be reduced per-document

Returns:

a single-valued expression which has been reduced for every document

createDoubleLambdaFunction

public static DoubleValueStream createDoubleLambdaFunction(String name,
                                                           LambdaFunction.TwoDoubleInDoubleOutLambda lambda,
                                                           DoubleValueStream param1,
                                                           DoubleValueStream param2)
                                                    throws SolrException

Creates a function that maps two doubles to a single double. This can take the following shapes:

• Taking in two single-valued expressions and returning a single-valued expression which represents the lambda combination of the inputs.
• Taking in a single-valued expression and a multi-valued expression and returning a multi-valued expression which represents the lambda combination of the single-value input with each of the values of the multi-value input.
  The inputs can be either func(single,multi) or func(multi,single).

Parameters:

name - name for the function

lambda - the function to be applied to every value: (double,double) -> double

param1 - the first parameter in the lambda

param2 - the second parameter in the lambda

Returns:

a single or multi valued expression combining the two parameters with the given lambda

Throws:

SolrException - if neither parameter is single-valued

createDoubleLambdaFunction

public static DoubleValue createDoubleLambdaFunction(String name,
                                                     LambdaFunction.TwoDoubleInDoubleOutLambda lambda,
                                                     DoubleValue[] params)

Forwards the creation of the function to createDoubleLambdaFunction(String, TwoDoubleInDoubleOutLambda, DoubleValue[], boolean), using for the last argument (allMustExist).

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (boolean, boolean) -> boolean

params - the expressions to reduce

Returns:

a single-value expression that reduces the parameters with the given lambda

createDoubleLambdaFunction

public static DoubleValue createDoubleLambdaFunction(String name,
                                                     LambdaFunction.TwoDoubleInDoubleOutLambda lambda,
                                                     DoubleValue[] params,
                                                     boolean allMustExist)

Creates a function that associatively (order is guaranteed) reduces multiple single-value double expressions into a single-value double expression for each document.
For a document, every parameter's value must exist for the resulting value to exist if allMustExist is true. If allMustExist is false, only one of the parameters' values must exist.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (double, double) -> double

params - the expressions to reduce

allMustExist - whether all parameters are required to exist

Returns:

a single-value expression that reduces the parameters with the given lambda

createDateLambdaFunction

public static DateValueStream createDateLambdaFunction(String name,
                                                       LambdaFunction.LongInLongOutLambda lambda,
                                                       DateValueStream param)

Creates a function that takes in either a single or multi valued date expression and returns the same type of expression with the given lambda function applied to every value.

NOTE: The lambda must work on longs, not Date objects

Parameters:

name - name for the function

lambda - the function to be applied to every value: (long) -> long

param - the expression to apply the lambda to

Returns:

an expression the same type as was given with the lambda applied

createDateLambdaFunction

public static DateValue createDateLambdaFunction(String name,
                                                 LambdaFunction.TwoLongInLongOutLambda lambda,
                                                 DateValueStream param)

Creates a function that takes in a multi-valued date expression and returns a single-valued date expression. The given lambda is used to associatively (order not guaranteed) reduce all values for a document down to a single value.

NOTE: The lambda must work on longs, not Date objects

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (long, long) -> long

param - the expression to be reduced per-document

Returns:

a single-valued expression which has been reduced for every document

createDateLambdaFunction

public static DateValueStream createDateLambdaFunction(String name,
                                                       LambdaFunction.TwoLongInLongOutLambda lambda,
                                                       DateValueStream param1,
                                                       DateValueStream param2)
                                                throws SolrException

Creates a function that maps two dates to a single date. This can take the following shapes:

• Taking in two single-valued expressions and returning a single-valued expression which represents the lambda combination of the inputs.
• Taking in a single-valued expression and a multi-valued expression and returning a multi-valued expression which represents the lambda combination of the single-value input with each of the values of the multi-value input.
  The inputs can be either func(single,multi) or func(multi,single).

NOTE: The lambda must work on longs, not Date objects

Parameters:

name - name for the function

lambda - the function to be applied to every value: (long,long) -> long

param1 - the first parameter in the lambda

param2 - the second parameter in the lambda

Returns:

a single or multi valued expression combining the two parameters with the given lambda

Throws:

SolrException - if neither parameter is single-valued

createDateLambdaFunction

public static DateValue createDateLambdaFunction(String name,
                                                 LambdaFunction.TwoLongInLongOutLambda lambda,
                                                 DateValue[] params)

Forwards the creation of the function to createDateLambdaFunction(String, TwoLongInLongOutLambda, DateValue[], boolean), using for the last argument (allMustExist).

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (boolean, boolean) -> boolean

params - the expressions to reduce

Returns:

a single-value expression that reduces the parameters with the given lambda

createDateLambdaFunction

public static DateValue createDateLambdaFunction(String name,
                                                 LambdaFunction.TwoLongInLongOutLambda lambda,
                                                 DateValue[] params,
                                                 boolean allMustExist)

Creates a function that associatively (order is guaranteed) reduces multiple single-value date expressions into a single-value date expression for each document.
For a document, every parameter's value must exist for the resulting value to exist if allMustExist is true. If allMustExist is false, only one of the parameters' values must exist.

NOTE: The lambda must work on longs, not Date objects

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (long, long) -> long

params - the expressions to reduce

allMustExist - whether all parameters are required to exist

Returns:

a single-value expression that reduces the parameters with the given lambda

createStringLambdaFunction

public static StringValueStream createStringLambdaFunction(String name,
                                                           LambdaFunction.StringInStringOutLambda lambda,
                                                           StringValueStream param)

Creates a function that takes in either a single or multi valued string expression and returns the same type of expression with the given lambda function applied to every value.

Parameters:

name - name for the function

lambda - the function to be applied to every value: (String) -> String

param - the expression to apply the lambda to

Returns:

an expression the same type as was given with the lambda applied

createStringLambdaFunction

public static StringValue createStringLambdaFunction(String name,
                                                     LambdaFunction.TwoStringInStringOutLambda lambda,
                                                     StringValueStream param)

Creates a function that takes in a multi-valued string expression and returns a single-valued string expression. The given lambda is used to associatively (order not guaranteed) reduce all values for a document down to a single value.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (String, String) -> String

param - the expression to be reduced per-document

Returns:

a single-valued expression which has been reduced for every document

createStringLambdaFunction

public static StringValueStream createStringLambdaFunction(String name,
                                                           LambdaFunction.TwoStringInStringOutLambda lambda,
                                                           StringValueStream param1,
                                                           StringValueStream param2)
                                                    throws SolrException

Creates a function that maps two strings to a single string. This can take the following shapes:

• Taking in two single-valued expressions and returning a single-valued expression which represents the lambda combination of the inputs.
• Taking in a single-valued expression and a multi-valued expression and returning a multi-valued expression which represents the lambda combination of the single-value input with each of the values of the multi-value input.
  The inputs can be either func(single,multi) or func(multi,single).

Parameters:

name - name for the function

lambda - the function to be applied to every value: (String,String) -> String

param1 - the first parameter in the lambda

param2 - the second parameter in the lambda

Returns:

a single or multi valued expression combining the two parameters with the given lambda

Throws:

SolrException - if neither parameter is single-valued

createStringLambdaFunction

public static StringValue createStringLambdaFunction(String name,
                                                     LambdaFunction.TwoStringInStringOutLambda lambda,
                                                     StringValue[] params)

Forwards the creation of the function to createStringLambdaFunction(String, TwoStringInStringOutLambda, StringValue[], boolean), using for the last argument (allMustExist).

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (boolean, boolean) -> boolean

params - the expressions to reduce

Returns:

a single-value expression that reduces the parameters with the given lambda

createStringLambdaFunction

public static StringValue createStringLambdaFunction(String name,
                                                     LambdaFunction.TwoStringInStringOutLambda lambda,
                                                     StringValue[] params,
                                                     boolean allMustExist)

Creates a function that associatively (order is guaranteed) reduces multiple single-value string expressions into a single-value string expression for each document.
For a document, every parameter's value must exist for the resulting value to exist if allMustExist is true. If allMustExist is false, only one of the parameters' values must exist.

Parameters:

name - name for the function

lambda - the associative function used to reduce the values: (String, String) -> String

params - the expressions to reduce

allMustExist - whether all parameters are required to exist

Returns:

a single-value expression that reduces the parameters with the given lambda