Noodle

Source link: https://github.com/nolia/Noodle

Noodle is a simple object storage for Android.

Download

Get it from JitPack.

repositories {

  ...
  maven {
 url 'https://jitpack.io' 
}
 
}
  dependencies {

  compile 'com.github.nolia:Noodle:master-SNAPSHOT' 
}

Usage

You can use Noodle both as a key-value storage and as collection persistence framework. To initialize Noodle you can use builder:

Noodle noodle = Noodle.with(context).build();

Key-value storage

You can put any type of object to the storage.

noodle.put("Android7", "Nougat").now();

Get stored value.

T value = noodle.get("myObject", T.class).now();

Remove the data.

boolean isRemoved = noodle.delete("toRemove").now();

Collections

Using collections is also really simple: no schema, no relations, no consistency rules, no thread-contained objects. Just create Noodle instance and register types you want to store. The only requirement, that class should have an annotated id field with type of Long or long.

class Book {

 @Id
long id;
 String title;
String author;
 public Book(String title, String author) {

  this.title = title;
  this.author = author;

}
 
}
  Noodle noodle = Noodle.with(context)
.addType(Book.class)
.build();

Alternatively, if you don't want or not able to add annotation to the class, you can use Description. You can provide either the name of the field (that it would be set with reflection mechanism):

Noodle noodle = Noodle.with(context)
.addType(Book.class, Description.of(Book.class)
  .withIdField("id")
  .build()
);

Or you can specify get and set methods:

Noodle noodle = Noodle.with(context)
.registerType(Book.class, Description.of(Book.class)
  .withGetIdOperator(book -> book.id))
  .withSetIdOperator((book, id) -> book.id = id)
  .build()
);

This allows you to use other types as an Id field.

Collections allow you to list, put, delete, get (by id) and filter your objects.

collection = noodle.collectionOf(Book.class);
  Book book = new Book("I Robot", "Isaac Asimov");
  // Get all. List<Book> list = collection.all().now();
  collection.put(book).now();
 // Now, book object has updated id.  // Update: book.title = "I, Robot"; collection.put(book).now();
  // Delete: collection.delete(book.id).now();

Filter

List<Book> search(final String query) {

return collection.filter(new Collection.Predicate<Book>() {

  @Override
  public boolean test(final Book book) {

 return book.title.contains(query)

  || book.authorName.contains(query);

  
}

}
).now();
 
}

Filtering is happening in memory, by pulling objects one by one and testing with provided predicate.

Threading

Each operation on collections and key-value storage is synchronized on Storage level. This means that can be only one read/write operation at a time.

All methods return Result object, which wraps the actual results, that you can access either with synchronous now() method, or with callback and get() method.

collection.filter(new Collection.Predicate<Book>() {

 @Override

 public boolean test(final Book book) {

return book.title.contains(query);

 
}

  
}
)
  .executeOn(Executors.newSingleThreadExecutor())
  .withCallback(new Result.Callback<List<Book>>() {

 @Override

 public void onReady(final List<Book> books) {

adapter.setBooks(books);

 
}

  @Override

 public void onError(final Exception e) {

Log.e(TAG, 'Error getting books:', e);

Toast.makeText(context, "Could not get your books :(", Toast.LENGTH_SHORT).show();

 
}

  
}
)
  .get();

Rx Support

If you prefer RxJava, Noodle is got you covered. You can convert any Result of the operation to Observable:

collection.put(book)
  .toRxObservable()
  .subscribe();

Notes:

RxJava v2 is used, so incompatible with version 1
Noodle does not ship RxJava transitively, so you have to provide it as a dependency
When doing get and delete operations, if item is not found, Noodle is returning null. But if using rx wrapper, due to that it does not allow null emissions, you will get NullPointerException in the onError callback.

Configure

Noodle noodle = Noodle.with(context)
  .converter(converter)
  .filePath(path)
  .encryption(encryption)
  .build();

Every component is pluggable, but Noodle provides defaults:

converter - Gson for converting objects to JSON and then to byte arrays
encryption - NoEncryption is by default, so nothing is encrypted, but you can easily implement one (it only has 2 methods)