MongoOM

MongoOM is an mongodb object mapper for java

Why another one?

Simply because none really fitted my needs.

Roadmap

• will soon use classmate for reflection stuff - https://github.com/cowtowncoder/java-classmate

Howto

Maven

Stable (Maven Central Repository, Released: 13.08.2012 - wait 24hrs for maven central)

<dependency>
  <groupId>de.flapdoodle.mongoom</groupId>
	<artifactId>de.flapdoodle.mongoom</artifactId>
  <version>1.4</version>
</dependency>

Snapshots (Repository http://oss.sonatype.org/content/repositories/snapshots)

<dependency>
  <groupId>de.flapdoodle.mongoom</groupId>
	<artifactId>de.flapdoodle.mongoom</artifactId>
  <version>1.5-SNAPSHOT</version>
</dependency>

Changelog

1.5 (SNAPSHOT)

1.4

• stable release

Setup

Mongo mongo = new Mongo( "localhost" , 27017 );

Set<Class<?>> classes = Sets.newLinkedHashSet();
classes.add(Document.class);
classes.add(User.class);

IMappingContextFactory<?> factory = new MappingContextFactory();
Transformations transformations = new Transformations(factory, classes);
IDatastore datastore = new Datastore(mongo, "databaseName", transformations);
	
datastore.ensureCaps();
datastore.ensureIndexes();

Mapping

Minimal Mapping

@Entity("Document")
public class Document
{
	@Id
	Reference<Document> _id;
}

More Complex Example

Document with multikey index, capped collection, embedded objects and readonly views

@Entity(value = "Document", cap = @CappedAt(size = 1000, count = 12))
@IndexGroups(@IndexGroup(group = "multikey", options = @IndexOption(unique = true)))
@Views(DocumentView.class)
public class Document {

	// Fieldname with Type (with removed underscore) 
	public static final PropertyReference<Meta> Meta = de.flapdoodle.mongoom.mapping.properties.Property.ref("meta",
			Meta.class);

	// Custom Mapping between ObjectId and typed Reference
	@Id
	Reference<Document> _id;

	// Version support
	@Version
	String _version;

	// Indexed in IndexGroup
	@IndexedInGroup(group = "multikey", direction = Direction.ASC)
	String _name;

	// Indexed
	@Indexed
	Date _created;

	// Custom Propertyname
	@Property(value = "metainfo")
	Meta _meta;

	...
}

Embedded Object

public class Meta
{
	public static final PropertyReference<List<String>> Keywords = Property.ref("keywords",
			Property.listType(String.class));

	@IndexedInGroup(group = "multikey")
	List<String> _keywords;
	...
}

View for ReadOnly Access

public class DocumentView
{
	String _name;

	@Property("metainfo.keywords")
	List<String> _keywords;
	
	public List<String> getKeywords() {
		return _keywords;
	}
}

And how to use it:

Mongo mongo = new Mongo( "localhost" , 27017 );

Set<Class<?>> classes = Sets.newLinkedHashSet();
classes.add(Document.class);

IMappingContextFactory<?> factory = new MappingContextFactory();
Transformations transformations = new Transformations(factory, classes);
IDatastore datastore = new Datastore(mongo, "databaseName", transformations);

datastore.ensureCaps();
datastore.ensureIndexes();

Document doc = new Document();
doc.setCreated(new Date());
doc.setName("Document One");

Meta metaInfo = new Meta();
ArrayList<String> keywords = Lists.newArrayList("Document", "One");
metaInfo.setKeywords(keywords);

doc.setMeta(metaInfo);
datastore.save(doc);

List<Document> list = datastore.with(Document.class).result().asList();

List<DocumentView> views = datastore.with(Document.class).field(Document.Meta).listfield(Meta.
		Keywords).eq("One").withView(DocumentView.class).asList();
DocumentView view = views.get(0);

assertEquals("Equal", keywords, view.getKeywords());

Query

Queries are runtime typesafe

Callbacks

OnRead and OnWrite Callbacks