tree cc5c9055a911d8225eea508a748cb3a2a45cd400
parent 8bad027c789d3fb3da8e68fa0154f2a24ccc2865
author Yigit Boyar <yboyar@google.com> 1480127170 -0800
committer Yigit Boyar <yboyar@google.com> 1499383209 -0700

Type Adapters

This CL introduces type adapter logic that can convert a java
type into / from a database column (ColumnTypeAdapter).

There are also type adapters which can be used to create intermediate
representations if the type cannot directly be converted into a
database column (e.g. a Boolean is first converted into int then
into database).

So far we only have primitive types + string. More will be added later.

An additional type adapter to convert int list to string is also
provided to cover more cases (might be removed).

The code generation structure may change in the future as we write
real code that reads / writes an entitiy but based on the prototype,
this setup seems promising.

Also, there is no way to define custom adapters yet, it will also come
later.

TypeAdapterStore is not optimized at all since the structure is not
set and equals checks on TypeMirror objects does not seem to work.
Once we have the final structure, may optimize.

Bug: 32342709
Test: BasicColumnTypeAdaptersTest.kt, TypeAdapterStoreTest.kt

Change-Id: I52fde5a92dbe0ebe7290e001ba9e497c6d8e3981