>
> Am I right in saying Guice doesn't supporting binding generic methods
> currently even with TypeLiteral/FactoryProvider tricks?
That does work Using Guice 3.0 Assisted injection and TypeLiteral:
install(new GinFactoryModuleBuilder().implement(new
TypeLiteral<Printable<Country>>() { }, new
TypeLiteral<PrintableImpl<Country>>() { }).build(new
TypeLiteral<PrintableFactory<Country>>() {
}));
Well, the caveat is that I have to bind every permutation. I'm sure
something similar can be done with normal provider. Also given the code you
gave, I think assisted injection would be a cleaner solution.
Cheers,
On Sat, Nov 20, 2010 at 10:36 AM, Bill de hÓra <[email protected]> wrote:
> Thanks Fred, the ProviderFactory's 'free' implementation had lead me down
> the wrong path. - normal Providers were exactly what I needed. I ended up
> with this
>
> public class Module extends AbstractPropertiesModule
> {
> @Override
> protected void configureModule() {
> bind(ColumnFactory.class).toProvider(ColumnFactoryProvider.class);
> }
>
> static class ColumnFactoryProvider implements Provider<ColumnFactory>
>
> {
> @Override
> public ColumnFactory get() {
> return new ColumnFactory()
> {
> @Override
> public <N, V> Column<N, V> create(N name, V value) {
> return new ColumnImpl<N, V>(name, value);
> }
>
> @Override
> public <N, V> Column<N, V> create(N name) {
> return new ColumnImpl<N, V>(name);
> }
>
> @Override
> public <N, V> Column<N, V> create(N name, V value, Long
> timestamp) {
> return new ColumnImpl<N, V>(name, value, timestamp);
>
> }
> };
> }
> }
> }
>
> public class Builder
> {
> private static Injector theInjector = Guice.createInjector(new
> datagrid.api.module.Module());
> private static ColumnFactory theColumnFactory =
> theInjector.getInstance(ColumnFactory.class);
>
> public static <K, V> Column<K, V> newColumn(K name, V value) {
> return theColumnFactory.create(name, value);
> }
>
> public static <K, V> Column<K, V> newColumn(K name) {
> return theColumnFactory.create(name);
> }
>
> public static <K, V> Column<K, V> newColumn(K name, V value, Long
> timestamp) {
> return theColumnFactory.create(name, value, timestamp);
> }
>
> }
>
> also a nice approach for legacy factory/builder code.
>
>
> Bill
>
>
> On Sat, 2010-11-20 at 09:21 -0500, Fred Faber wrote:
>
> I envision your interface as:
>
>
>
> interface ColumnFactory {
>
> <K, V> Column<K, V> newColumn(
>
> K name, V value, long timestampMillis);
>
> }
>
>
> Then you could adapt your current implementation:
>
>
>
> bind(ColumnFactory.class)
>
> .toProvider(new Provider<ColumnFactory>(){
>
> @Override public ColumnFactory get() {
>
> return new ColumnFactory() {
>
> @Override public <K, V> Column<K, V>
>
> newColumn(
>
> K name, V value, long timestampMillis) {
>
> return Builder.newColumn(
>
> name, value, timestampMillis);
>
> }
>
> );
>
> }
>
> }});
>
>
>
> Nothing to worry about here with generic methods.
>
>
>
> -Fred
>
>
>
>
> On Sat, Nov 20, 2010 at 8:58 AM, Bill de hÓra <[email protected]> wrote:
>
>
> I have a Builder object that generates objects with generic methods like
> this -
>
> public class Builder
> {
> public static <K, V> Column<K, V> newColumn(K name, V value, long
> tstamp) {
> return new ColumnImpl<K, V>(name, value, tstamp);
> }
> }
>
> ie, it's akin to Guava's Maps/Lists classes. I'd like the impl classes to
> be provided by Guice, eg
>
> public class Builder
> {
> private static Injector theInjector = Guice.createInjector(new
> datagrid.api.module.Module());
> private static ColumnFactory theColumnFactory =
> theInjector.getInstance(ColumnFactory.class);
>
> public static <K, V> Column<K, V> newColumn(K name, V value, long
> tstamp) {
> return theColumnFactory.create(name, value, long);
> }
> }
>
> Am I right in saying Guice doesn't supporting binding generic methods
> currently even with TypeLiteral/FactoryProvider tricks?
>
> Bill
>
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www.arcbees.com
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