Commit 4bfa2ebb authored Jan 05, 2018 by Steven Moreland

Generic Mutable class for HIDL code.

In general, using Mutable inside of structures
or as API arguments is a code smell. However, it
is the most syntactically clean way of fetching
something out of a lambda or inner class.

Using this, one can do:
Mutable<Result> res = new Mutable<>();
hidlObject.foo((...) -> {
    res.value = ...;
});

There is an alternative:
Result a[] = new Result[1];
hidlObject.foo((...) -> {
    a[0] = ...;
});

However, this alternative syntax is relatively messy.

Bug: N/A
Test: boot, use w/ wifi
Change-Id: Ibff13c653cc17bd25ddbb0534ba21ef485bff7aa

parent ae81e15c

core/java/android/os/HidlSupport.java

+19 −0

Original line number	Diff line number	Diff line
		@@ -85,6 +85,25 @@ public class HidlSupport {
		return lft.equals(rgt);
		}

		/**
		* Class which can be used to fetch an object out of a lambda. Fetching an object
		* out of a local scope with HIDL is a common operation (although usually it can
		* and should be avoided).
		*
		* @param <E> Inner object type.
		*/
		public static final class Mutable<E> {
		public E value;

		public Mutable() {
		value = null;
		}

		public Mutable(E value) {
		this.value = value;
		}
		}

		/**
		* Similar to Arrays.deepHashCode, but also take care of lists.
		*/