Package com.apple.foundationdb.record

Class EvaluationContextBuilder

java.lang.Object

com.apple.foundationdb.record.EvaluationContextBuilder

@API(UNSTABLE)
public class EvaluationContextBuilder
extends Object

A builder for EvaluationContext.

 context.childBuilder().setBinding("x", x).build()
 

Field Summary

Fields

Modifier and Type	Field	Description
protected final Bindings.Builder	bindings

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	EvaluationContextBuilder()	Create an empty builder.
protected	EvaluationContextBuilder(EvaluationContext original)	Create a builder based on an existing EvaluationContext.

Method Summary

Modifier and Type	Method	Description
EvaluationContext	build(TypeRepository typeRepository)	Construct an EvaluationContext with updated bindings.
Object	getBinding(String name)	Get the current binding for some parameter in the current Bindings.
EvaluationContextBuilder	setBinding(CorrelationIdentifier alias, Object value)	Bind an alias to a value.
EvaluationContextBuilder	setBinding(String name, Object value)	Bind a name to a value.
EvaluationContextBuilder	setConstant(CorrelationIdentifier alias, Object value)

Methods inherited from class java.lang.Object

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

Field Details

bindings

@Nonnull
protected final Bindings.Builder bindings

Constructor Details

EvaluationContextBuilder

protected EvaluationContextBuilder()

Create an empty builder.

EvaluationContextBuilder

protected EvaluationContextBuilder(@Nonnull
 EvaluationContext original)

Create a builder based on an existing EvaluationContext. This ensures that the resulting EvaluationContext has all of the bindings contained in the original context (except for those which have had their value over-ridden).

Parameters:

original - the original EvaluationContext to build a new one around

Method Details

getBinding

@Nullable
public Object getBinding(@Nonnull
 String name)

Get the current binding for some parameter in the current Bindings. This will reflect any mutations that have been made to the state through calls to setBinding(String, Object) since the builder was created.

Parameters:

name - the name of the parameter to retrieve the binding of

Returns:

the current value bound to the given parameter

See Also:

• EvaluationContext.getBinding(String)

setBinding

@Nonnull
public EvaluationContextBuilder setBinding(@Nonnull
 String name,
 @Nullable
 Object value)

Bind a name to a value. This mutation will be reflected in the EvaluationContext returned by calling build(TypeRepository).

Parameters:

name - the name of the binding

value - the value to associate with the name

Returns:

this EvaluationContextBuilder

setBinding

public EvaluationContextBuilder setBinding(@Nonnull
 CorrelationIdentifier alias,
 @Nullable
 Object value)

Bind an alias to a value. This mutation will be reflected in the EvaluationContext returned by calling build(TypeRepository).

Parameters:

alias - the alias of the binding

value - the value to associate with the name

Returns:

this EvaluationContextBuilder

setConstant

public EvaluationContextBuilder setConstant(@Nonnull
 CorrelationIdentifier alias,
 @Nullable
 Object value)

build

@Nonnull
public EvaluationContext build(@Nonnull
 TypeRepository typeRepository)

Construct an EvaluationContext with updated bindings. This should include all bindings specified though the original EvaluationContext included in this object's constructor as well as any bindings that have been added through calls to setBinding(String, Object). All other state included in the context should remain the same.

Parameters:

typeRepository - a type repository to be used in the new context

Returns:

an EvaluationContext with updated bindings