Java Key类代码示例

import com.google.cloud.datastore.Key; //导入依赖的package包/类
/**
 * Initializes Datastore and cleans out any residual values.  Also initializes global variables
 * used for testing.
 */
@Before
public void setUp() {
  datastore = HELPER.getOptions().toBuilder().setNamespace("ghijklmnop").build().getService();
  StructuredQuery<Key> query = Query.newKeyQueryBuilder().build();
  QueryResults<Key> result = datastore.run(query);
  datastore.delete(Iterators.toArray(result, Key.class));
  keyFactory = datastore.newKeyFactory().setKind("Task");
  taskKey = keyFactory.newKey("some-arbitrary-key");
  testEntity = Entity.newBuilder(taskKey, TEST_FULL_ENTITY).build();
  Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
  calendar.set(1990, JANUARY, 1);
  startDate = Timestamp.of(calendar.getTime());
  calendar.set(2000, JANUARY, 1);
  endDate = Timestamp.of(calendar.getTime());
  calendar.set(1999, DECEMBER, 31);
  includedDate = Timestamp.of(calendar.getTime());
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
@Override
public void delete(Iterable<? extends T> entities) {
	deleteKeys(new Iterable<Key>() {
		@Override
		public Iterator<Key> iterator() {
			Iterator<? extends T> entityIter = entities.iterator();
			return new Iterator<Key>() {
				@Override
				public boolean hasNext() {
					return entityIter.hasNext();
				}

				@Override
				public Key next() {
					T entity = entityIter.next();
					ID id = entityInformation.getId(entity);
					return getKey(id);
				}
			};
		}
	});
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
@Override
public <S extends T> Iterable<S> save(Iterable<S> entities) {
	Datastore datastore = this.datastoreOptions.getService();

	List<FullEntity<? extends IncompleteKey>> buffer = new ArrayList<>();

	for (S entity : entities) {
		ID id = this.entityInformation.getId(entity);
		Key key = getKey(id);

		buffer.add(this.marshaller.toEntity(entity, key));
		if (buffer.size() >= BUFFER_SIZE) {
			datastore.put(buffer.toArray(new FullEntity[buffer.size()]));
			buffer.clear();
		}
	}
	if (buffer.size() > 0) {
		datastore.put(buffer.toArray(new FullEntity[buffer.size()]));
	}

	return entities;
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
private void deleteKeys(Iterable<Key> keys) {
	Datastore datastore = this.datastoreOptions.getService();

	List<Key> buffer = new ArrayList<>(BUFFER_SIZE);
	for (Key key : keys) {
		buffer.add(key);

		if (buffer.size() >= BUFFER_SIZE) {
			datastore.delete(buffer.toArray(new Key[buffer.size()]));
			buffer.clear();
		}
	}
	if (buffer.size() > 0) {
		datastore.delete(buffer.toArray(new Key[buffer.size()]));
	}
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
private <U> void setAncestorFilter(StructuredQuery.Builder<U> queryBuilder) {
	Datastore datastore = datastoreOptions.getService();

	Deque<PathElement> ancestors = Context.getAncestors();
	Deque<PathElement> init = new LinkedList<>();
	init.addAll(ancestors);
	PathElement last = init.pollLast();

	if (last != null) {
		KeyFactory keyFactory = datastore.newKeyFactory();
		keyFactory.addAncestors(init).setKind(last.getKind());
		Key key = last.hasId() ? keyFactory.newKey(last.getId())
				: keyFactory.newKey(last.getName());
		queryBuilder.setFilter(StructuredQuery.PropertyFilter.hasAncestor(key));
	}
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
private Key getKey(ID id) {
	Datastore datastore = this.datastoreOptions.getService();

	KeyFactory keyFactory = datastore.newKeyFactory().setKind(this.kind);
	Iterable<PathElement> ancestors = Context.getAncestors();
	keyFactory.addAncestors(ancestors);

	Key key;
	if (id instanceof Number) {
		key = keyFactory.newKey(((Number) id).longValue());
	}
	else {
		key = keyFactory.newKey(id.toString());
	}
	return key;
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
protected StructuredQuery.Filter setAncestorFilter(StructuredQuery.Filter filter) {
	Datastore datastore = datastoreOptions.getService();

	Deque<PathElement> ancestors = Context.getAncestors();
	Deque<PathElement> init = new LinkedList<>();
	init.addAll(ancestors);
	PathElement last = init.pollLast();

	if (last == null) {
		return filter;
	}
	else {
		KeyFactory keyFactory = datastore.newKeyFactory();
		keyFactory.addAncestors(init).setKind(last.getKind());
		Key key = last.hasId()
				? keyFactory.newKey(last.getId()) : keyFactory.newKey(last.getName());
		StructuredQuery.Filter ancestorFilter = StructuredQuery.PropertyFilter.hasAncestor(key);
		if (filter == null) {
			return ancestorFilter;
		}
		else {
			return StructuredQuery.CompositeFilter.and(filter, ancestorFilter);
		}
	}
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
@Test
public void testUnmarshalToObject_Blob() {
	// Setup
	byte[] hello = "hello".getBytes(Charset.forName("UTF-8"));
	Key key = Key.newBuilder("project", "kind", 1).build();
	Entity entity = Entity.newBuilder(key).set("object", Blob.copyFrom(hello))
			.set("bytes", Blob.copyFrom(hello)).set("string", Blob.copyFrom(hello))
			.build();
	Unmarshaller unmarshaller = new Unmarshaller();
	TestBean bean = new TestBean();

	// Exercise
	unmarshaller.unmarshalToObject(entity, bean);

	// Verify
	Assert.assertArrayEquals(hello, (byte[]) bean.object);
	Assert.assertArrayEquals(hello, bean.bytes);
	Assert.assertEquals("hello", bean.string);
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
@Test
public void testUnmarshalToObject_Boolean() {
	// Setup
	Key key = Key.newBuilder("project", "kind", 1).build();
	Entity entity = Entity.newBuilder(key).set("object", true)
			.set("boxedBoolean", true).set("primitiveBoolean", true).build();
	Unmarshaller unmarshaller = new Unmarshaller();
	TestBean bean = new TestBean();

	// Exercise
	unmarshaller.unmarshalToObject(entity, bean);

	// Verify
	Assert.assertEquals(Boolean.TRUE, bean.object);
	Assert.assertEquals(Boolean.TRUE, bean.boxedBoolean);
	Assert.assertTrue(bean.primitiveBoolean);
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
@Test
public void testUnmarshalToObject_Map1() {
	// Setup
	Key key = Key.newBuilder("project", "kind", 1).build();
	Entity entity = Entity.newBuilder(key)
			.set("object", Entity.newBuilder().set("k", "v").build())
			.set("map", Entity.newBuilder().set("k", "v").build()).build();
	Unmarshaller unmarshaller = new Unmarshaller();
	TestBean bean = new TestBean();

	// Exercise
	unmarshaller.unmarshalToObject(entity, bean);

	// Verify
	Map<String, Object> expected = new HashMap<>();
	expected.put("k", "v");
	Assert.assertEquals(expected, bean.object);
	Assert.assertEquals(expected, bean.map);
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
@Test
public void testUnmarshalToObject_Map2() {
	// Setup
	Key key = Key.newBuilder("project", "kind", 1).build();
	Entity entity = Entity.newBuilder(key)
			.set("object", Entity.newBuilder()
					.set("k1", Entity.newBuilder().set("k2", "v2").build()).build())
			.set("map", Entity.newBuilder()
					.set("k1", Entity.newBuilder().set("k2", "v2").build()).build())
			.build();
	Unmarshaller unmarshaller = new Unmarshaller();
	TestBean bean = new TestBean();

	// Exercise
	unmarshaller.unmarshalToObject(entity, bean);

	// Verify
	Map<String, Object> innerMap = new HashMap<>();
	innerMap.put("k2", "v2");
	Map<String, Object> expected = new HashMap<>();
	expected.put("k1", innerMap);
	Assert.assertEquals(expected, bean.object);
	Assert.assertEquals(expected, bean.map);
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
@Override
public List<String> getKinds(boolean excludeSystemKinds) {
  try {
    String query = "SELECT __key__ FROM " + ENTITY_KINDS + " ORDER BY __key__";
    GqlQuery.Builder<Key> gqlQueryBuilder = Query.newGqlQueryBuilder(ResultType.KEY, query);
    gqlQueryBuilder.setNamespace(entityManager.getEffectiveNamespace());
    GqlQuery<Key> gqlQuery = gqlQueryBuilder.build();
    QueryResults<Key> results = entityManager.getDatastore().run(gqlQuery);
    List<String> kinds = new ArrayList<>(50);
    while (results.hasNext()) {
      Key key = results.next();
      String kind = key.getName();
      if (excludeSystemKinds && kind.startsWith("__")) {
        continue;
      }
      kinds.add(key.getName());
    }
    return kinds;
  } catch (DatastoreException exp) {
    throw new EntityManagerException(exp);
  }
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
@Override
public List<DatastoreProperty> getProperties(String kind) {
  try {
    Key nativeKey = entityManager.newNativeKeyFactory().setKind(ENTITY_KINDS).newKey(kind);
    DefaultDatastoreKey key = new DefaultDatastoreKey(nativeKey);
    String query = "SELECT * FROM " + ENTITY_PROPERTIES
        + " WHERE __key__ HAS ANCESTOR @1 ORDER BY __key__";
    EntityQueryRequest request = entityManager.createEntityQueryRequest(query);
    request.addPositionalBinding(key);
    QueryResponse<DatastoreProperty> response = entityManager
        .executeEntityQueryRequest(DatastoreProperty.class, request);
    return response.getResults();
  } catch (DatastoreException exp) {
    throw new EntityManagerException(exp);
  }
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
/**
 * Marshals the given entity and and returns the equivalent Entity needed for the underlying Cloud
 * Datastore API.
 * 
 * @return A native entity that is equivalent to the POJO being marshalled. The returned value
 *         could either be a FullEntity or Entity.
 */
private BaseEntity<?> marshal() {
  marshalKey();
  if (key instanceof Key) {
    entityBuilder = Entity.newBuilder((Key) key);
  } else {
    entityBuilder = FullEntity.newBuilder(key);
  }
  marshalFields();
  marshalAutoTimestampFields();
  if (intent == Intent.UPDATE) {
    marshalVersionField();
  }
  marshalEmbeddedFields();
  return entityBuilder.build();
}
 

import com.google.cloud.datastore.Key; //导入依赖的package包/类
/**
 * Executes the given {@link KeyQueryRequest} and returns the response.
 * 
 * @param request
 *          the key query request
 * @return the query response
 */
public QueryResponse<DatastoreKey> executeKeyQueryRequest(KeyQueryRequest request) {
  try {
    GqlQuery.Builder<Key> queryBuilder = Query.newGqlQueryBuilder(ResultType.KEY,
        request.getQuery());
    queryBuilder.setNamespace(entityManager.getEffectiveNamespace());
    queryBuilder.setAllowLiteral(request.isAllowLiterals());
    QueryUtils.applyNamedBindings(queryBuilder, request.getNamedBindings());
    QueryUtils.applyPositionalBindings(queryBuilder, request.getPositionalBindings());
    GqlQuery<Key> gqlQuery = queryBuilder.build();
    QueryResults<Key> results = nativeReader.run(gqlQuery);
    List<DatastoreKey> entities = new ArrayList<>();
    DefaultQueryResponse<DatastoreKey> response = new DefaultQueryResponse<>();
    response.setStartCursor(new DefaultDatastoreCursor(results.getCursorAfter().toUrlSafe()));
    while (results.hasNext()) {
      Key result = results.next();
      DatastoreKey datastoreKey = new DefaultDatastoreKey(result);
      entities.add(datastoreKey);
    }
    response.setResults(entities);
    response.setEndCursor(new DefaultDatastoreCursor(results.getCursorAfter().toUrlSafe()));
    return response;
  } catch (DatastoreException exp) {
    throw new EntityManagerException(exp);
  }
}