Package com.yahoo.searchlib.rankingexpression.evaluation

Class AbstractArrayContext

java.lang.Object

com.yahoo.searchlib.rankingexpression.evaluation.Context

com.yahoo.searchlib.rankingexpression.evaluation.AbstractArrayContext

All Implemented Interfaces:

ContextIndex, com.yahoo.tensor.evaluation.EvaluationContext<Reference>, com.yahoo.tensor.evaluation.TypeContext<Reference>, Cloneable

Direct Known Subclasses:

ArrayContext, DoubleOnlyArrayContext

public abstract class AbstractArrayContext
extends Context
implements Cloneable, ContextIndex

Superclass of contexts which supports array index based lookup. Instances may be reused indefinitely for evaluations of a single ranking expression, in a single thread at the time.

Author:

bratseth

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractArrayContext(RankingExpression expression)	Create a fast lookup context for an expression.
protected	AbstractArrayContext(RankingExpression expression, boolean ignoreUnknownValues)
protected	AbstractArrayContext(RankingExpression expression, boolean ignoreUnknownValues, Value missingValue)	Create a fast lookup context for an expression.

Method Summary

Modifier and Type	Method	Description
AbstractArrayContext	clone()	Creates a clone of this context suitable for evaluating against the same ranking expression in a different thread (i.e, name name to index map, different value set.
protected double[]	doubleValues()
double	getDouble(int index)	Perform a fast lookup directly of the value as a double.
int	getIndex(String name)	Returns the index from a name.
protected boolean	ignoreUnknownValues()
Set<String>	names()	Returns all the names available in this, or throws an UnsupportedOperationException if this operation is not supported.
protected Map<String,Integer>	nameToIndex()
int	size()	Returns the max number of variables which may be set in this
String	toString()

Methods inherited from class com.yahoo.searchlib.rankingexpression.evaluation.Context

get, get, get, getTensor, getType, put, put

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.yahoo.searchlib.rankingexpression.evaluation.ContextIndex

get

Methods inherited from interface com.yahoo.tensor.evaluation.TypeContext

getType

Constructor Detail

AbstractArrayContext

protected AbstractArrayContext(RankingExpression expression)

Create a fast lookup context for an expression. This instance should be reused indefinitely by a single thread. This will fail if unknown values are attempted added.

AbstractArrayContext

protected AbstractArrayContext(RankingExpression expression,
                               boolean ignoreUnknownValues)

AbstractArrayContext

protected AbstractArrayContext(RankingExpression expression,
                               boolean ignoreUnknownValues,
                               Value missingValue)

Create a fast lookup context for an expression. This instance should be reused indefinitely by a single thread.

Parameters:

expression - the expression to create a context for

ignoreUnknownValues - whether attempts to put values not present in this expression should fail (false - the default), or be ignored (true)

Method Detail

nameToIndex

protected final Map<String,Integer> nameToIndex()

doubleValues

protected final double[] doubleValues()

ignoreUnknownValues

protected final boolean ignoreUnknownValues()

names

public Set<String> names()

Description copied from class: Context

Returns all the names available in this, or throws an UnsupportedOperationException if this operation is not supported. This default implementation does the latter.

Overrides:

names in class Context

Returns:

the set of all variable names.

getIndex

public final int getIndex(String name)

Returns the index from a name.

Specified by:

getIndex in interface ContextIndex

Throws:

NullPointerException - is this name is not known to this context

size

public int size()

Returns the max number of variables which may be set in this

Specified by:

size in interface ContextIndex

getDouble

public double getDouble(int index)

Perform a fast lookup directly of the value as a double. This is faster than get(index).asDouble()

Specified by:

getDouble in interface ContextIndex

Overrides:

getDouble in class Context

Parameters:

index - the index of the variable whose value to return.

Returns:

the value of the indexed variable.

toString

public String toString()

Overrides:

toString in class Object

clone

public AbstractArrayContext clone()

Creates a clone of this context suitable for evaluating against the same ranking expression in a different thread (i.e, name name to index map, different value set.

Overrides:

clone in class Object