com.facebook.litho

Class ComponentUtils

java.lang.Object

com.facebook.litho.ComponentUtils

public class ComponentUtils
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
ComponentUtils()

Method Summary

Modifier and Type	Method and Description
static EventHandler<ErrorEvent>	createOrGetErrorEventHandler(Component component, ComponentContext parentContext, ComponentContext scopedContext)
static boolean	hasEquivalentFields(java.lang.Object obj1, java.lang.Object obj2) Given two object instances of the same type, this method accesses all their internal fields, to check if they are equivalent.
static boolean	hasEquivalentState(StateContainer stateContainer1, StateContainer stateContainer2)
static boolean	isEquivalent(Component current, Component next) Given two components this method accesses all their internal fields, excluding the fields of StateContainer if the class type is a Component, to check if they are equivalent.
static boolean	isSameComponentType(Component a, Component b)
static void	raise(ComponentContext c, java.lang.Exception e) Reraise an error event up the hierarchy so it can be caught by another component, or reach the root and cause the application to crash.
static LithoMetadataExceptionWrapper	wrapWithMetadata(ComponentContext c, java.lang.Exception e) Uses the given ComponentContext to add metadata to a wrapper exception (if the wrapper doesn't already exist) and return it.
static LithoMetadataExceptionWrapper	wrapWithMetadata(ComponentTree c, java.lang.Exception e) Uses the given ComponentTree to add metadata to a wrapper exception (if the wrapper doesn't already exist) and return it.

Methods inherited from class java.lang.Object

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

Constructor Detail

ComponentUtils

public ComponentUtils()

Method Detail

isSameComponentType

public static boolean isSameComponentType(Component a,
                                          Component b)

isEquivalent

public static boolean isEquivalent(Component current,
                                   Component next)

Given two components this method accesses all their internal fields, excluding the fields of StateContainer if the class type is a Component, to check if they are equivalent. There's special equality code to handle special class types e.g. Components, EventHandlers, etc.

Parameters:

current - current Component

next - next Component

Returns:

true iff the component fields are equivalent.

hasEquivalentState

public static boolean hasEquivalentState(StateContainer stateContainer1,
                                         StateContainer stateContainer2)

hasEquivalentFields

public static boolean hasEquivalentFields(java.lang.Object obj1,
                                          java.lang.Object obj2)

Given two object instances of the same type, this method accesses all their internal fields, to check if they are equivalent. There's special equality code to handle special class types e.g. Components, EventHandlers, etc. Components are considered equivalent if they have the same props.

Parameters:

obj1 -

obj2 -

Returns:

true if the two instances are equivalent. False otherwise.

raise

public static void raise(ComponentContext c,
                         java.lang.Exception e)

Reraise an error event up the hierarchy so it can be caught by another component, or reach the root and cause the application to crash.

Parameters:

c - The component context the error event was caught in.

e - The original exception.

wrapWithMetadata

public static LithoMetadataExceptionWrapper wrapWithMetadata(ComponentContext c,
                                                             java.lang.Exception e)

Uses the given ComponentContext to add metadata to a wrapper exception (if the wrapper doesn't already exist) and return it.

wrapWithMetadata

public static LithoMetadataExceptionWrapper wrapWithMetadata(ComponentTree c,
                                                             java.lang.Exception e)

Uses the given ComponentTree to add metadata to a wrapper exception (if the wrapper doesn't already exist) and return it.

createOrGetErrorEventHandler

public static EventHandler<ErrorEvent> createOrGetErrorEventHandler(Component component,
                                                                    ComponentContext parentContext,
                                                                    ComponentContext scopedContext)