MultiCacheKey

Class Overview

A cache key that wraps multiple cache keys.

Note: equals and hashcode are implemented in a way that two MultiCacheKeys are equal if and only if the underlying list of cache keys is equal. That implies AllOf semantics. Unfortunately, it is not possible to implement AnyOf semantics for equals because the transitivity requirement wouldn't be satisfied. I.e. we would have: {A} = {A, B}, {A, B} = {B}, but {A} != {B}.

It is fine to use this key with AnyOf semantics, but one should be aware of equals and hashcode behavior, and should implement AnyOf logic manually.

Summary

[Expand] Inherited Methods
From class java.lang.Object Object clone() boolean equals(Object arg0) void finalize() final Class<?> getClass() int hashCode() final void notify() final void notifyAll() String toString() final void wait(long arg0, int arg1) final void wait(long arg0) final void wait()
From interface com.facebook.cache.common.CacheKey abstract boolean containsUri(Uri uri) Returns true if this key was constructed from this Uri. abstract boolean equals(Object o) This method must be implemented, otherwise the cache keys will be be compared by reference. abstract String getUriString() Returns a string representation of the URI at the heart of the cache key. abstract int hashCode() This method must be implemented with accordance to the equals(Object) method. abstract boolean isResourceIdForDebugging() Returns true if this key was constructed from a resource ID. abstract String toString() This is useful for instrumentation and debugging purposes.