Class Bucket (2.3.0)

public class Bucket extends BucketInfo

A Google cloud storage bucket.

Objects of this class are immutable. Operations that modify the bucket like #update return a new object. To get a Bucket object with the most recent information use #reload. Bucket adds a layer of service-related functionality over BucketInfo.

Inheritance

Object > BucketInfo > Bucket

Methods

create(String blob, byte[] content, Bucket.BlobTargetOption[] options)

public Blob create(String blob, byte[] content, Bucket.BlobTargetOption[] options)

Creates a new blob in this bucket. Direct upload is used to upload content. For large content, Blob#writer(com.google.cloud.storage.Storage.BlobWriteOption...) is recommended as it uses resumable upload. MD5 and CRC32C hashes of content are computed and used for validating transferred data.

Example of creating a blob in the bucket from a byte array.


 String blobName = "my_blob_name";
 Blob blob = bucket.create(blobName, "Hello, World!".getBytes(UTF_8));
 
Parameters
Name Description
blob String

a blob name

content byte[]

the blob content

options BlobTargetOption[]

options for blob creation

Returns
Type Description
Blob

a complete blob information

create(String blob, byte[] content, String contentType, Bucket.BlobTargetOption[] options)

public Blob create(String blob, byte[] content, String contentType, Bucket.BlobTargetOption[] options)

Creates a new blob in this bucket. Direct upload is used to upload content. For large content, Blob#writer(com.google.cloud.storage.Storage.BlobWriteOption...) is recommended as it uses resumable upload. MD5 and CRC32C hashes of content are computed and used for validating transferred data.

Example of creating a blob in the bucket from a byte array with a content type.


 String blobName = "my_blob_name";
 Blob blob = bucket.create(blobName, "Hello, World!".getBytes(UTF_8), "text/plain");
 
Parameters
Name Description
blob String

a blob name

content byte[]

the blob content

contentType String

the blob content type

options BlobTargetOption[]

options for blob creation

Returns
Type Description
Blob

a complete blob information

create(String blob, InputStream content, Bucket.BlobWriteOption[] options)

public Blob create(String blob, InputStream content, Bucket.BlobWriteOption[] options)

Creates a new blob in this bucket. Direct upload is used to upload content. For large content, Blob#writer(com.google.cloud.storage.Storage.BlobWriteOption...) is recommended as it uses resumable upload.

Example of creating a blob in the bucket from an input stream.


 String blobName = "my_blob_name";
 InputStream content = new ByteArrayInputStream("Hello, World!".getBytes(UTF_8));
 Blob blob = bucket.create(blobName, content);
 
Parameters
Name Description
blob String

a blob name

content InputStream

the blob content as a stream

options BlobWriteOption[]

options for blob creation

Returns
Type Description
Blob

a complete blob information

create(String blob, InputStream content, String contentType, Bucket.BlobWriteOption[] options)

public Blob create(String blob, InputStream content, String contentType, Bucket.BlobWriteOption[] options)

Creates a new blob in this bucket. Direct upload is used to upload content. For large content, Blob#writer(com.google.cloud.storage.Storage.BlobWriteOption...) is recommended as it uses resumable upload.

Example of creating a blob in the bucket from an input stream with a content type.


 String blobName = "my_blob_name";
 InputStream content = new ByteArrayInputStream("Hello, World!".getBytes(UTF_8));
 Blob blob = bucket.create(blobName, content, "text/plain");
 
Parameters
Name Description
blob String

a blob name

content InputStream

the blob content as a stream

contentType String

the blob content type

options BlobWriteOption[]

options for blob creation

Returns
Type Description
Blob

a complete blob information

createAcl(Acl acl)

public Acl createAcl(Acl acl)

Creates a new ACL entry on this bucket.

Example of creating a new ACL entry.


 Acl acl = bucket.createAcl(Acl.of(User.ofAllAuthenticatedUsers(), Acl.Role.READER));
 
Parameter
Name Description
acl Acl
Returns
Type Description
Acl

createDefaultAcl(Acl acl)

public Acl createDefaultAcl(Acl acl)

Creates a new default blob ACL entry on this bucket.

Default ACLs are applied to a new blob within the bucket when no ACL was provided for that blob.

Example of creating a new default ACL entry.


 Acl acl = bucket.createDefaultAcl(Acl.of(User.ofAllAuthenticatedUsers(), Acl.Role.READER));
 
Parameter
Name Description
acl Acl
Returns
Type Description
Acl

delete(Bucket.BucketSourceOption[] options)

public boolean delete(Bucket.BucketSourceOption[] options)

Deletes this bucket.

Example of deleting the bucket, if its metageneration matches the Bucket#getMetageneration() value, otherwise a StorageException is thrown.


 boolean deleted = bucket.delete(BucketSourceOption.metagenerationMatch());
 if (deleted) {
   // the bucket was deleted
 } else {
   // the bucket was not found
 }
 
Parameter
Name Description
options BucketSourceOption[]

bucket delete options

Returns
Type Description
boolean

true if bucket was deleted, false if it was not found

deleteAcl(Acl.Entity entity)

public boolean deleteAcl(Acl.Entity entity)

Deletes the ACL entry for the specified entity on this bucket.

Example of deleting the ACL entry for an entity.


 boolean deleted = bucket.deleteAcl(User.ofAllAuthenticatedUsers());
 if (deleted) {
   // the acl entry was deleted
 } else {
   // the acl entry was not found
 }
 
Parameter
Name Description
entity Acl.Entity
Returns
Type Description
boolean

true if the ACL was deleted, false if it was not found

deleteDefaultAcl(Acl.Entity entity)

public boolean deleteDefaultAcl(Acl.Entity entity)

Deletes the default object ACL entry for the specified entity on this bucket.

Default ACLs are applied to a new blob within the bucket when no ACL was provided for that blob.

Example of deleting the default ACL entry for an entity.


 boolean deleted = bucket.deleteDefaultAcl(User.ofAllAuthenticatedUsers());
 if (deleted) {
   // the acl entry was deleted
 } else {
   // the acl entry was not found
 }
 
Parameter
Name Description
entity Acl.Entity
Returns
Type Description
boolean

true if the ACL was deleted, false if it was not found

equals(Object obj)

public final boolean equals(Object obj)
Parameter
Name Description
obj Object
Returns
Type Description
boolean
Overrides

exists(Bucket.BucketSourceOption[] options)

public boolean exists(Bucket.BucketSourceOption[] options)

Checks if this bucket exists.

Example of checking if the bucket exists.


 boolean exists = bucket.exists();
 if (exists) {
   // the bucket exists
 } else {
   // the bucket was not found
 }
 
Parameter
Name Description
options BucketSourceOption[]
Returns
Type Description
boolean

true if this bucket exists, false otherwise

get(Iterable<String> blobNames)

public List<Blob> get(Iterable<String> blobNames)

Returns a list of requested blobs in this bucket. Blobs that do not exist are null.

Example of getting some blobs in the bucket, using a batch request.


 String blobName1 = "my_blob_name1";
 String blobName2 = "my_blob_name2";
 List<String> blobNames = new LinkedList<>();
 blobNames.add(blobName1);
 blobNames.add(blobName2);
 List<Blob> blobs = bucket.get(blobNames);
 for (Blob blob : blobs) {
   if (blob == null) {
     // the blob was not found
   }
 }
 
Parameter
Name Description
blobNames Iterable<String>

blobs to get

Returns
Type Description
List<Blob>

an immutable list of Blob objects

get(String blob, Storage.BlobGetOption[] options)

public Blob get(String blob, Storage.BlobGetOption[] options)

Returns the requested blob in this bucket or null if not found.

Example of getting a blob in the bucket, only if its metageneration matches a value, otherwise a StorageException is thrown.


 String blobName = "my_blob_name";
 long generation = 42;
 Blob blob = bucket.get(blobName, BlobGetOption.generationMatch(generation));
 
Parameters
Name Description
blob String

name of the requested blob

options BlobGetOption[]

blob search options

Returns
Type Description
Blob

get(String blobName1, String blobName2, String[] blobNames)

public List<Blob> get(String blobName1, String blobName2, String[] blobNames)

Returns a list of requested blobs in this bucket. Blobs that do not exist are null.

Example of getting some blobs in the bucket, using a batch request.


 String blobName1 = "my_blob_name1";
 String blobName2 = "my_blob_name2";
 List<Blob> blobs = bucket.get(blobName1, blobName2);
 for (Blob blob : blobs) {
   if (blob == null) {
     // the blob was not found
   }
 }
 
Parameters
Name Description
blobName1 String

first blob to get

blobName2 String

second blob to get

blobNames String[]

other blobs to get

Returns
Type Description
List<Blob>

an immutable list of Blob objects

getAcl(Acl.Entity entity)

public Acl getAcl(Acl.Entity entity)

Returns the ACL entry for the specified entity on this bucket or null if not found.

Example of getting the ACL entry for an entity.


 Acl acl = bucket.getAcl(User.ofAllAuthenticatedUsers());
 
Parameter
Name Description
entity Acl.Entity
Returns
Type Description
Acl

getDefaultAcl(Acl.Entity entity)

public Acl getDefaultAcl(Acl.Entity entity)

Returns the default object ACL entry for the specified entity on this bucket or null if not found.

Default ACLs are applied to a new blob within the bucket when no ACL was provided for that blob.

Example of getting the default ACL entry for an entity.


 Acl acl = bucket.getDefaultAcl(User.ofAllAuthenticatedUsers());
 
Parameter
Name Description
entity Acl.Entity
Returns
Type Description
Acl

getStorage()

public Storage getStorage()

Returns the bucket's Storage object used to issue requests.

Returns
Type Description
Storage

hashCode()

public final int hashCode()
Returns
Type Description
int
Overrides

list(Storage.BlobListOption[] options)

public Page<Blob> list(Storage.BlobListOption[] options)

Returns the paginated list of Blob in this bucket.

Example of listing the blobs in the bucket.


 Page<Blob> blobs = bucket.list();
 Iterator<Blob> blobIterator = blobs.iterateAll();
 while (blobIterator.hasNext()) {
   Blob blob = blobIterator.next();
   // do something with the blob
 }
 
Parameter
Name Description
options BlobListOption[]

options for listing blobs

Returns
Type Description
Page<Blob>

listAcls()

public List<Acl> listAcls()

Lists the ACL entries for this bucket.

Example of listing the ACL entries.


 List<Acl> acls = bucket.listAcls();
 for (Acl acl : acls) {
   // do something with ACL entry
 }
 
Returns
Type Description
List<Acl>

listDefaultAcls()

public List<Acl> listDefaultAcls()

Lists the default blob ACL entries for this bucket.

Default ACLs are applied to a new blob within the bucket when no ACL was provided for that blob.

Example of listing the default ACL entries.


 List<Acl> acls = bucket.listDefaultAcls();
 for (Acl acl : acls) {
   // do something with ACL entry
 }
 
Returns
Type Description
List<Acl>

lockRetentionPolicy(Storage.BucketTargetOption[] options)

public Bucket lockRetentionPolicy(Storage.BucketTargetOption[] options)

Locks bucket retention policy. Requires a local metageneration value in the request. Review example below.

Accepts an optional userProject BucketTargetOption option which defines the project id to assign operational costs.

Warning: Once a retention policy is locked, it can't be unlocked, removed, or shortened.

Example of locking a retention policy on a bucket, only if its local metageneration value matches the bucket's service metageneration otherwise a StorageException is thrown.


 String bucketName = "my_unique_bucket";
 Bucket bucket = storage.get(bucketName, BucketGetOption.fields(BucketField.METAGENERATION));
 storage.lockRetentionPolicy(bucket, BucketTargetOption.metagenerationMatch());
 
Parameter
Name Description
options BucketTargetOption[]
Returns
Type Description
Bucket

a Bucket object of the locked bucket

reload(Bucket.BucketSourceOption[] options)

public Bucket reload(Bucket.BucketSourceOption[] options)

Fetches current bucket's latest information. Returns null if the bucket does not exist.

Example of getting the bucket's latest information, if its generation does not match the Bucket#getMetageneration() value, otherwise a StorageException is thrown.


 Bucket latestBucket = bucket.reload(BucketSourceOption.metagenerationMatch());
 if (latestBucket == null) {
   // the bucket was not found
 }
 
Parameter
Name Description
options BucketSourceOption[]

bucket read options

Returns
Type Description
Bucket

a Bucket object with latest information or null if not found

toBuilder()

public Bucket.Builder toBuilder()

Returns a builder for the current bucket.

Returns
Type Description
Bucket.Builder
Overrides

update(Storage.BucketTargetOption[] options)

public Bucket update(Storage.BucketTargetOption[] options)

Updates the bucket's information. Bucket's name cannot be changed. A new Bucket object is returned. By default no checks are made on the metadata generation of the current bucket. If you want to update the information only if the current bucket metadata are at their latest version use the metagenerationMatch option: bucket.update(BucketTargetOption.metagenerationMatch())

Example of updating the bucket's information.


 Bucket updatedBucket = bucket.toBuilder().setVersioningEnabled(true).build().update();
 
Parameter
Name Description
options BucketTargetOption[]

update options

Returns
Type Description
Bucket

a Bucket object with updated information

updateAcl(Acl acl)

public Acl updateAcl(Acl acl)

Updates an ACL entry on this bucket.

Example of updating a new ACL entry.


 Acl acl = bucket.updateAcl(Acl.of(User.ofAllAuthenticatedUsers(), Acl.Role.OWNER));
 
Parameter
Name Description
acl Acl
Returns
Type Description
Acl

updateDefaultAcl(Acl acl)

public Acl updateDefaultAcl(Acl acl)

Updates a default blob ACL entry on this bucket.

Default ACLs are applied to a new blob within the bucket when no ACL was provided for that blob.

Example of updating a new default ACL entry.


 Acl acl = bucket.updateDefaultAcl(Acl.of(User.ofAllAuthenticatedUsers(), Acl.Role.OWNER));
 
Parameter
Name Description
acl Acl
Returns
Type Description
Acl