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Storable with Set

This commit is contained in:
Denis Karmyshakov 2017-07-06 19:50:30 +03:00
parent cf6200dc2d
commit 12de015db4
1 changed files with 47 additions and 0 deletions
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47
src/main/java/ru/touchin/templates/googlejson/GoogleJsonPreferences.java
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@ -29,7 +29,9 @@ import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import ru.touchin.roboswag.components.utils.storables.PreferenceStore;
import ru.touchin.roboswag.core.observables.storable.Converter;
@ -83,6 +85,26 @@ public final class GoogleJsonPreferences {
.build();
}
@NonNull
public static <T> Storable<String, Set<T>, String> jsonSetStorable(@NonNull final String name,
@NonNull final Class<T> jsonItemClass,
@NonNull final SharedPreferences preferences) {
return new Storable.Builder<>(name, Set.class, String.class, new PreferenceStore<>(preferences), new JsonSetConverter<>(jsonItemClass))
.setObserveStrategy(Storable.ObserveStrategy.CACHE_ACTUAL_VALUE)
.build();
}
@NonNull
public static <T> NonNullStorable<String, Set<T>, String> jsonSetStorable(@NonNull final String name,
@NonNull final Class<T> jsonItemClass,
@NonNull final SharedPreferences preferences,
@NonNull final Set<T> defaultValue) {
return new Storable.Builder<>(name, Set.class, String.class, new PreferenceStore<>(preferences), new JsonSetConverter<>(jsonItemClass))
.setObserveStrategy(Storable.ObserveStrategy.CACHE_ACTUAL_VALUE)
.setDefaultValue(defaultValue)
.build();
}
private GoogleJsonPreferences() {
}
@ -146,4 +168,29 @@ public final class GoogleJsonPreferences {
}
public static class JsonSetConverter<T> extends JsonConverter<Set<T>> {
@NonNull
private final Class<T> itemClass;
public JsonSetConverter(@NonNull final Class<T> itemClass) {
super();
this.itemClass = itemClass;
}
@Nullable
@Override
public Set<T> toObject(@NonNull final Type jsonObjectType, @NonNull final Type stringType, @Nullable final String storeValue) {
if (storeValue == null) {
return null;
}
try {
return new HashSet<>(GoogleJsonModel.DEFAULT_JSON_FACTORY.createJsonParser(storeValue).parseArray(HashSet.class, itemClass));
} catch (final IOException exception) {
throw new ShouldNotHappenException(exception);
}
}
}
}