[jira] [Created] (CALCITE-3328) Immutable beans, powered by reflection

["Julian Hyde (Jira)" <ji...@apache.org>]

Julian Hyde created CALCITE-3328:
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             Summary: Immutable beans, powered by reflection
                 Key: CALCITE-3328
                 URL: https://issues.apache.org/jira/browse/CALCITE-3328
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde


In quite a few places we have immutable config classes, and because they are immutable we have builders. It all gets quite verbose.

I propose to add a utility class, {{ImmutableBeans}}, that is able to generate an implementation of a given interface. For example,
{code:java}
interface MyBean {
  @Property  int getAge();
  @Property String getName();
}

MyBean b = ImmutableBeans.create(MyBean.class);
assertThat(b.withAge(37).withName("Fred").getAge(), is(37));
{code}

We could replace SqlParser.ConfigBuilder, Frameworks.ConfigBuilder, RelBuilder.ConfigBuilder, quite a few of the associated Config classes, and perhaps quite a few fluent classes that we use in tests.



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