Examples of org.mongodb.morphia.Key

org.mongodb.morphia.Key

The key object; this class is take from the app-engine datastore (mostly) implementation. It is also Serializable and GWT-safe, enabling your entity objects to be used for GWT RPC should you so desire.

You may use normal DBRef objects as relationships in your entities if you desire neither type safety nor GWT-ability.
@author Jeff Schnitzer (from Objectify codebase) @author Scott Hernandez (adapted to morphia/mongodb)


        // check the history key (a key is the namespace + id)


        if (dbObject.containsField(ID_KEY) && getMappedClass(entity).getIdField() != null
            && getMappedClass(entity).getEntityAnnotation() != null) {
            final Key<T> key = new Key(entity.getClass(), dbObject.get(ID_KEY));
            final T cachedInstance = cache.getEntity(key);
            if (cachedInstance != null) {
                return cachedInstance;
            } else {
                cache.putEntity(key, entity); // to avoid stackOverflow in recursive refs
            }
        }


        final MappedClass mc = getMappedClass(entity);


        final DBObject updated = mc.callLifecycleMethods(PreLoad.class, entity, dbObject, this);
        try {
            for (final MappedField mf : mc.getPersistenceFields()) {
                readMappedField(updated, mf, entity, cache);
            }
        } catch (final MappingException e) {
            Object id = dbObject.get(ID_KEY);
            String entityName = entity.getClass().getName();
            throw new MappingException(format("Could not map %s with ID: %s", entityName, id), e);
        }


        if (updated.containsField(ID_KEY) && getMappedClass(entity).getIdField() != null) {
            final Key key = new Key(entity.getClass(), updated.get(ID_KEY));
            cache.putEntity(key, entity);
        }
        mc.callLifecycleMethods(PostLoad.class, entity, updated, this);
        return entity;
    }

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        if (o == null && mapper.getOptions().isStoreNulls()) {
            values.add(null);
            return;
        }


        final Key key = o instanceof Key
                        ? (Key) o
                        : getKey(o, mapper);
        values.add(idOnly
                   ? mapper.keyToManualRef(key)
                   : mapper.keyToRef(key));

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            final MappedClass mappedClass = mapper.getMappedClass(entity);
            final Object id = mappedClass.getIdField().get(entity);
            if (id == null) {
                throw new MappingException("@Id field cannot be null!");
            }
            return new Key(mappedClass.getCollectionName(), id);
        } catch (IllegalAccessException iae) {
            throw new RuntimeException(iae);
        }
    }

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            mf.setFieldValue(entity, references);
        }
    }


    boolean exists(final Class c, final Object ref, final EntityCache cache, final Mapper mapper, final boolean idOnly) {
        final Key key = idOnly ? mapper.manualRefToKey(c, ref) : mapper.refToKey((DBRef) ref);
        final DBRef dbRef = idOnly ? null : (DBRef) ref;
        final Boolean cached = cache.exists(key);
        if (cached != null) {
            return cached;
        }

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        if (ref == null) {
            return null;
        }


        final DBRef dbRef = idOnly ? null : (DBRef) ref;
        final Key key = mapper.createKey(mf.isSingleValue() ? mf.getType() : mf.getSubClass(),
                                         idOnly ? ref : dbRef.getId());
        final Datastore ds = idOnly ? mapper.getDatastoreProvider().get() : null;


        final Object cached = cache.getEntity(key);
        if (cached != null) {
            return cached;
        }


        //TODO: if _db is null, set it?
        final DBObject refDbObject = idOnly ? ds.getCollection(key.getKindClass()).findOne(ref) : dbRef.fetch();


        if (refDbObject != null) {
            Object refObj = mapper.getOptions().getObjectFactory().createInstance(mapper, mf, refDbObject);
            refObj = mapper.fromDb(refDbObject, refObj, cache);
            cache.putEntity(key, refObj);

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        mf.setFieldValue(entity, m);
    }


    private Object createOrReuseProxy(final Class referenceObjClass, final Object ref, final EntityCache cache, final Mapper mapper,
                                      final boolean idOnly) {
        final Key key = idOnly ? mapper.manualRefToKey(referenceObjClass, ref) : mapper.refToKey((DBRef) ref);
        final Object proxyAlreadyCreated = cache.getProxy(key);
        if (proxyAlreadyCreated != null) {
            return proxyAlreadyCreated;
        }
        final Object newProxy = mapper.getProxyFactory().createProxy(referenceObjClass, key, mapper.getDatastoreProvider());

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Related Classes of org.mongodb.morphia.Key

org.mongodb.morphia.mapping.Mapper

org.mongodb.morphia.mapping.ReferenceMapper

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