com.facebook.buck.core.starlark.coercer

Interface SkylarkDescriptionArgBuilder

All Known Implementing Classes:

SkylarkDescriptionArg

public interface SkylarkDescriptionArgBuilder

Simple interface used to get and set values after they are coerced on a SkylarkDescriptionArg.

This is primarily used to remove a circular dependency in buck around SkylarkDescriptionArg. We want SkylarkDescriptionArg to have a copy of SkylarkUserDefinedRule. We also want SkylarkUserDefinedRule (which owns the Attribute mapping) to be able to hold onto the corresponding SkylarkParamInfo mapping. SkylarkParamInfo ultimately needs to be able to set values on a SkylarkDescriptionArg, though. So, if we used SkylarkDescriptionArg, rather than a builder, we'd run into this circular dep: SkylarkUserDefinedRule -> SkylarkParamInfo -> SkylarkDescriptionArg -> SkylarkUserDefinedRule

This abstraction lets us easily just set/get post-coercion values in a SkylarkDescriptionArg that is in the process of being constructed, without having to know about the SkylarkUserDefinedRule that the com.facebook.buck.core.starlark.rule.SkylarkDescriptionArgs holds onto.

Method Summary

Modifier and Type	Method and Description
Object	getPostCoercionValue(String attr) Get an attribute's value after it was set in setPostCoercionValue(String, Object)
void	setPostCoercionValue(String attr, Object value) Set the value for a specific attribute after it has been successfully coerced/type checked.

Method Detail

setPostCoercionValue

void setPostCoercionValue(String attr,
                          Object value)

Set the value for a specific attribute after it has been successfully coerced/type checked. This attribute must be defined in the originally provided SkylarkUserDefinedRule

Parameters:

attr - The attribute to set the value for

value - The value to set. Must not be null.

getPostCoercionValue

Object getPostCoercionValue(String attr)

Get an attribute's value after it was set in setPostCoercionValue(String, Object)

It is an error to get an attribute that has not been set.

Parameters:

attr - The attribute to get the value for

Returns:

The value