Package com.yahoo.searchlib.rankingexpression

Class ExpressionFunction

java.lang.Object

com.yahoo.searchlib.rankingexpression.ExpressionFunction

public class ExpressionFunction
extends Object

A function defined by a ranking expression, optionally containing type information for inputs and outputs. Immutable, but note that ranking expressions are *not* immutable.

Author:

Simon Thoresen Hult, bratseth

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	ExpressionFunction.Instance	An instance of a serialization of this function, using a particular serialization context (by expand(com.yahoo.searchlib.rankingexpression.rule.SerializationContext, java.util.List<com.yahoo.searchlib.rankingexpression.rule.ExpressionNode>, java.util.Deque<java.lang.String>))

Constructor Summary

Constructors

Constructor	Description
ExpressionFunction(String name, RankingExpression body)	Constructs a new function with no arguments
ExpressionFunction(String name, List<String> arguments, RankingExpression body)	Constructs a new function
ExpressionFunction(String name, List<String> arguments, RankingExpression body, Map<String,com.yahoo.tensor.TensorType> argumentTypes, Optional<com.yahoo.tensor.TensorType> returnType)

Method Summary

Modifier and Type	Method	Description
List<String>	arguments()	Returns an immutable list of the arguments of this
Map<String,com.yahoo.tensor.TensorType>	argumentTypes()	Returns the types of the arguments of this, if specified.
ExpressionFunction.Instance	expand(SerializationContext context, List<ExpressionNode> argumentValues, Deque<String> path)	Creates and returns an instance of this function based on the given arguments.
RankingExpression	getBody()
String	getName()
Optional<com.yahoo.tensor.TensorType>	returnType()	Returns the return type of this, or empty if not specified
String	toString()
ExpressionFunction	withArgument(String argument)	Returns a copy of this with the given argument added (if not already present)
ExpressionFunction	withArgument(String argument, com.yahoo.tensor.TensorType type)	Returns a copy of this with the given argument (if not present) and argument type added
ExpressionFunction	withBody(RankingExpression body)	Returns a copy of this with the body changed to the given value
ExpressionFunction	withName(String name)
ExpressionFunction	withReturnType(com.yahoo.tensor.TensorType returnType)

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionFunction

public ExpressionFunction(String name,
                          RankingExpression body)

Constructs a new function with no arguments

Parameters:

name - the name of this function

body - the ranking expression that defines this function

ExpressionFunction

public ExpressionFunction(String name,
                          List<String> arguments,
                          RankingExpression body)

Constructs a new function

Parameters:

name - the name of this function

arguments - its argument names

body - the ranking expression that defines this function

ExpressionFunction

public ExpressionFunction(String name,
                          List<String> arguments,
                          RankingExpression body,
                          Map<String,com.yahoo.tensor.TensorType> argumentTypes,
                          Optional<com.yahoo.tensor.TensorType> returnType)

Method Detail

getName

public String getName()

arguments

public List<String> arguments()

Returns an immutable list of the arguments of this

getBody

public RankingExpression getBody()

argumentTypes

public Map<String,com.yahoo.tensor.TensorType> argumentTypes()

Returns the types of the arguments of this, if specified. The keys of this may be any subset of the arguments

returnType

public Optional<com.yahoo.tensor.TensorType> returnType()

Returns the return type of this, or empty if not specified

withName

public ExpressionFunction withName(String name)

withBody

public ExpressionFunction withBody(RankingExpression body)

Returns a copy of this with the body changed to the given value

withReturnType

public ExpressionFunction withReturnType(com.yahoo.tensor.TensorType returnType)

withArgument

public ExpressionFunction withArgument(String argument)

Returns a copy of this with the given argument added (if not already present)

withArgument

public ExpressionFunction withArgument(String argument,
                                       com.yahoo.tensor.TensorType type)

Returns a copy of this with the given argument (if not present) and argument type added

expand

public ExpressionFunction.Instance expand(SerializationContext context,
                                          List<ExpressionNode> argumentValues,
                                          Deque<String> path)

Creates and returns an instance of this function based on the given arguments. If function calls are nested, this call may produce additional functions.

Parameters:

context - the context used to expand this

argumentValues - the arguments to instantiate on.

path - the expansion path leading to this.

Returns:

the script function instance created.

toString

public String toString()

Overrides:

toString in class Object