net.fortytwo.stream.caching

Class Query.QueryVariables

java.lang.Object

net.fortytwo.stream.caching.Query.QueryVariables

Enclosing class:

Query<T,S>

public static class Query.QueryVariables
extends java.lang.Object

An array of variables used in a query, mapping an integer index to variable names and vice versa

Constructor Summary

Constructors

Constructor and Description
QueryVariables(java.util.Collection<java.lang.String> coll) Constructs a new array of variable names

Method Summary

Modifier and Type	Method and Description
java.lang.String[]	asArray() Gets the variable names as an array
<T> Bindings<T>	bind(VariableOrConstant<java.lang.String,T>[] pattern, T[] tuple) Finds the set of bindings created by pairing the variables in the given pattern with the corresponding elements of the given tuple
int	indexOf(java.lang.String variable) Gets the index of a given variable name

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryVariables

public QueryVariables(java.util.Collection<java.lang.String> coll)

Constructs a new array of variable names

Parameters:

coll - the variable names as a collection. The order of the names is preserved

Method Detail

asArray

public java.lang.String[] asArray()

Gets the variable names as an array

Returns:

the variable names as an array

indexOf

public int indexOf(java.lang.String variable)

Gets the index of a given variable name

Parameters:

variable - the name of a variable

Returns:

the index of the variable in this array

bind

public <T> Bindings<T> bind(VariableOrConstant<java.lang.String,T>[] pattern,
                            T[] tuple)

Finds the set of bindings created by pairing the variables in the given pattern with the corresponding elements of the given tuple

Type Parameters:

T - the value tupe

Parameters:

pattern - a tuple pattern

tuple - a tuple

Returns:

the set of bindings created by pairing the variables in the given pattern with the corresponding elements of the given tuple