Package com.google.cloud.hadoop.gcsio

Class GoogleCloudStorageImpl

java.lang.Object

com.google.cloud.hadoop.gcsio.GoogleCloudStorageImpl

All Implemented Interfaces:

GoogleCloudStorage

public class GoogleCloudStorageImpl
extends Object
implements GoogleCloudStorage

Provides read/write access to Google Cloud Storage (GCS), using Java nio channel semantics. This is a basic implementation of the GoogleCloudStorage interface that mostly delegates through to the appropriate API call(s) via the generated JSON API client, while adding reliability and performance features such as setting up low-level retries, translating low-level exceptions, and request batching.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	GoogleCloudStorageImpl.BackOffFactory	A factory for producing BackOff objects.
static class	GoogleCloudStorageImpl.Builder

Nested classes/interfaces inherited from interface com.google.cloud.hadoop.gcsio.GoogleCloudStorage

GoogleCloudStorage.ListPage<T>

Field Summary

Fields inherited from interface com.google.cloud.hadoop.gcsio.GoogleCloudStorage

LIST_MAX_RESULTS, MAX_COMPOSE_OBJECTS, MAX_RESULTS_UNLIMITED, PATH_DELIMITER

Method Summary

Modifier and Type	Method	Description
static GoogleCloudStorageImpl.Builder	builder()
void	close()	See GoogleCloudStorage.close() for details about expected behavior.
void	compose(String bucketName, List<String> sources, String destination, String contentType)	Composes inputs into a single GCS object.
GoogleCloudStorageItemInfo	composeObjects(List<StorageResourceId> sources, StorageResourceId destination, CreateObjectOptions options)	Composes inputs into a single GCS object.
void	copy(String srcBucketName, List<String> srcObjectNames, String dstBucketName, List<String> dstObjectNames)	See GoogleCloudStorage.copy(String, List, String, List) for details about expected behavior.
void	copy(Map<StorageResourceId,StorageResourceId> sourceToDestinationObjectsMap)	See GoogleCloudStorage.copy(String, List, String, List) for details about expected behavior.
WritableByteChannel	create(StorageResourceId resourceId, CreateObjectOptions options)	Creates and opens an object for writing.
void	createBucket(String bucketName, CreateBucketOptions options)	See GoogleCloudStorage.createBucket(String, CreateBucketOptions) for details about expected behavior.
void	createEmptyObject(StorageResourceId resourceId)	See GoogleCloudStorage.createEmptyObject(StorageResourceId) for details about expected behavior.
void	createEmptyObject(StorageResourceId resourceId, CreateObjectOptions options)	Creates an empty object, useful for placeholders representing, for example, directories.
void	createEmptyObjects(List<StorageResourceId> resourceIds)	See GoogleCloudStorage.createEmptyObjects(List) for details about expected behavior.
void	createEmptyObjects(List<StorageResourceId> resourceIds, CreateObjectOptions options)	Creates a list of empty objects; see GoogleCloudStorage.createEmptyObject(StorageResourceId) for the single-item version of this method.
void	createFolder(StorageResourceId resourceId, boolean recursive)	See GoogleCloudStorage.createFolder(StorageResourceId,boolean) for details about expected behavior.
static GoogleCloudStorageItemInfo	createItemInfoForBucket(StorageResourceId resourceId, com.google.api.services.storage.model.Bucket bucket)	Helper for converting a StorageResourceId + Bucket into a GoogleCloudStorageItemInfo.
static GoogleCloudStorageItemInfo	createItemInfoForStorageObject(com.google.api.services.storage.model.StorageObject object)
static GoogleCloudStorageItemInfo	createItemInfoForStorageObject(StorageResourceId resourceId, com.google.api.services.storage.model.StorageObject object)	Helper for converting a StorageResourceId + StorageObject into a GoogleCloudStorageItemInfo.
void	deleteBuckets(List<String> bucketNames)	See GoogleCloudStorage.deleteBuckets(List) for details about expected behavior.
void	deleteFolders(List<FolderInfo> folders)	See GoogleCloudStorage.deleteFolders(List) for details about expected behavior.
void	deleteObjects(List<StorageResourceId> fullObjectNames)	See GoogleCloudStorage.deleteObjects(List) for details about expected behavior.
GoogleCloudStorageItemInfo	getFolderInfo(StorageResourceId resourceId)	See GoogleCloudStorage.getFolderInfo(StorageResourceId) for details about expected behavior.
GoogleCloudStorageItemInfo	getItemInfo(StorageResourceId resourceId)	See GoogleCloudStorage.getItemInfo(StorageResourceId) for details about expected behavior.
List<GoogleCloudStorageItemInfo>	getItemInfos(List<StorageResourceId> resourceIds)	See GoogleCloudStorage.getItemInfos(List) for details about expected behavior.
GoogleCloudStorageOptions	getOptions()	Retrieve the options that were used to create this GoogleCloudStorage.
Map<String,Long>	getStatistics()	Retrieves the statistics associated with the GoogleCloudStorage instance.
boolean	isHnBucket(URI src)	Checks if resourceId belongs to a Hierarchical namespace enabled bucket.
List<GoogleCloudStorageItemInfo>	listBucketInfo()	See GoogleCloudStorage.listBucketInfo() for details about expected behavior.
List<String>	listBucketNames()	See GoogleCloudStorage.listBucketNames() for details about expected behavior.
GoogleCloudStorage.ListPage<FolderInfo>	listFolderInfoForPrefixPage(String bucketName, String objectNamePrefix, ListFolderOptions listFolderOptions, String pageToken)	Returns the list of folder resources.
List<GoogleCloudStorageItemInfo>	listObjectInfo(String bucketName, String objectNamePrefix, ListObjectOptions listOptions)	Lists GoogleCloudStorageItemInfo of objects contained in the given bucket and whose names begin with the given prefix.
GoogleCloudStorage.ListPage<GoogleCloudStorageItemInfo>	listObjectInfoPage(String bucketName, String objectNamePrefix, ListObjectOptions listOptions, String pageToken)	The same semantics as GoogleCloudStorage.listObjectInfo(java.lang.String, java.lang.String), but returns only result of single list request (1 page).
List<GoogleCloudStorageItemInfo>	listObjectInfoStartingFrom(String bucketName, String startOffset, ListObjectOptions listOptions)	Lists GoogleCloudStorageItemInfo of objects contained in the given bucket and their name is lexicographically greater than or equal the provided offset.
void	move(Map<StorageResourceId,StorageResourceId> sourceToDestinationObjectsMap)	See GoogleCloudStorage#move(Map) for details about expected behavior.
SeekableByteChannel	open(GoogleCloudStorageItemInfo itemInfo, GoogleCloudStorageReadOptions readOptions)	See GoogleCloudStorage.open(GoogleCloudStorageItemInfo) for details about expected behavior.
SeekableByteChannel	open(StorageResourceId resourceId, GoogleCloudStorageReadOptions readOptions)	See GoogleCloudStorage.open(StorageResourceId) for details about expected behavior.
void	renameHnFolder(URI src, URI dst)	Renames src to dst using the rename LRO API.
List<GoogleCloudStorageItemInfo>	updateItems(List<UpdatableItemInfo> itemInfoList)	Attempt to update metadata of the objects referenced within the passed itemInfo objects.
static void	validateCopyArguments(String srcBucketName, List<String> srcObjectNames, String dstBucketName, List<String> dstObjectNames, GoogleCloudStorage googleCloudStorage)
static void	validateCopyArguments(Map<StorageResourceId,StorageResourceId> sourceToDestinationObjectsMap, GoogleCloudStorage gcsImpl)	Validates basic argument constraints like non-null, non-empty Strings, using Preconditions in addition to checking for src/dst bucket existence and compatibility of bucket properties such as location and storage-class.
static void	validateMoveArguments(Map<StorageResourceId,StorageResourceId> sourceToDestinationObjectsMap)	Validates basic argument constraints like non-null, non-empty Strings, using Preconditions in addition to checking for src/dst bucket equality.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.google.cloud.hadoop.gcsio.GoogleCloudStorage

create, createBucket, listObjectInfo, listObjectInfoPage, listObjectInfoStartingFrom, open, open

Method Detail

validateCopyArguments

public static void validateCopyArguments(String srcBucketName,
                                         List<String> srcObjectNames,
                                         String dstBucketName,
                                         List<String> dstObjectNames,
                                         GoogleCloudStorage googleCloudStorage)
                                  throws IOException

Throws:

IOException

getOptions

public GoogleCloudStorageOptions getOptions()

Description copied from interface: GoogleCloudStorage

Retrieve the options that were used to create this GoogleCloudStorage.

Specified by:

getOptions in interface GoogleCloudStorage

create

public WritableByteChannel create(StorageResourceId resourceId,
                                  CreateObjectOptions options)
                           throws IOException

Description copied from interface: GoogleCloudStorage

Creates and opens an object for writing. The bucket must already exist. If resourceId contains a known generationId or a generationId of 0, it is used instead of any "overwrite" settings in the provided CreateObjectOptions (overwrite will only succeed if the provided generationId matches the existing object, where a generationId of 0 indicates no existing object expected).

Specified by:

create in interface GoogleCloudStorage

Parameters:

resourceId - identifies a StorageObject

options - Options to use when creating the object

Returns:

a channel for writing to the given object

Throws:

IOException - on IO error

createBucket

public void createBucket(String bucketName,
                         CreateBucketOptions options)
                  throws IOException

See GoogleCloudStorage.createBucket(String, CreateBucketOptions) for details about expected behavior.

Specified by:

createBucket in interface GoogleCloudStorage

Parameters:

bucketName - name of the bucket to create

options - options to use when creating bucket

Throws:

IOException - on IO error

createEmptyObject

public void createEmptyObject(StorageResourceId resourceId,
                              CreateObjectOptions options)
                       throws IOException

Description copied from interface: GoogleCloudStorage

Creates an empty object, useful for placeholders representing, for example, directories. The bucket must already exist. If the object already exists, it is overwritten. See GoogleCloudStorage.create(StorageResourceId) for the behavior if StorageResourceId.getGenerationId() is explicitly set.

Specified by:

createEmptyObject in interface GoogleCloudStorage

Parameters:

resourceId - identifies a StorageObject

options - options to use when creating the object

Throws:

IOException - on IO error

createEmptyObject

public void createEmptyObject(StorageResourceId resourceId)
                       throws IOException

See GoogleCloudStorage.createEmptyObject(StorageResourceId) for details about expected behavior.

Specified by:

createEmptyObject in interface GoogleCloudStorage

Parameters:

resourceId - identifies a StorageObject

Throws:

IOException - on IO error

createEmptyObjects

public void createEmptyObjects(List<StorageResourceId> resourceIds,
                               CreateObjectOptions options)
                        throws IOException

Description copied from interface: GoogleCloudStorage

Creates a list of empty objects; see GoogleCloudStorage.createEmptyObject(StorageResourceId) for the single-item version of this method. Implementations may use different flow than the single-item version for greater efficiency. See GoogleCloudStorage.create(StorageResourceId) for the behavior if StorageResourceId.getGenerationId() is explicitly set.

Specified by:

createEmptyObjects in interface GoogleCloudStorage

Throws:

IOException

createEmptyObjects

public void createEmptyObjects(List<StorageResourceId> resourceIds)
                        throws IOException

See GoogleCloudStorage.createEmptyObjects(List) for details about expected behavior.

Specified by:

createEmptyObjects in interface GoogleCloudStorage

Throws:

IOException

open

public SeekableByteChannel open(StorageResourceId resourceId,
                                GoogleCloudStorageReadOptions readOptions)
                         throws IOException

See GoogleCloudStorage.open(StorageResourceId) for details about expected behavior.

Specified by:

open in interface GoogleCloudStorage

Parameters:

resourceId - identifies a StorageObject

readOptions - Fine-grained options for behaviors of retries, buffering, etc.

Returns:

a channel for reading from the given object

Throws:

FileNotFoundException - if the given object does not exist

IOException - if object exists but cannot be opened

open

public SeekableByteChannel open(GoogleCloudStorageItemInfo itemInfo,
                                GoogleCloudStorageReadOptions readOptions)
                         throws IOException

See GoogleCloudStorage.open(GoogleCloudStorageItemInfo) for details about expected behavior.

Specified by:

open in interface GoogleCloudStorage

Parameters:

itemInfo - identifies a StorageObject

readOptions - Fine-grained options for behaviors of retries, buffering, etc.

Returns:

a channel for reading from the given object

Throws:

FileNotFoundException - if the given object does not exist

IOException - if object exists but cannot be opened

deleteBuckets

public void deleteBuckets(List<String> bucketNames)
                   throws IOException

See GoogleCloudStorage.deleteBuckets(List) for details about expected behavior.

Specified by:

deleteBuckets in interface GoogleCloudStorage

Parameters:

bucketNames - name of the buckets to delete

Throws:

FileNotFoundException - if the given bucket does not exist

IOException - on IO error

deleteObjects

public void deleteObjects(List<StorageResourceId> fullObjectNames)
                   throws IOException

See GoogleCloudStorage.deleteObjects(List) for details about expected behavior.

Specified by:

deleteObjects in interface GoogleCloudStorage

Parameters:

fullObjectNames - names of objects to delete with their respective bucketNames.

Throws:

FileNotFoundException - if the given object does not exist

IOException - if object exists but cannot be deleted

deleteFolders

public void deleteFolders(List<FolderInfo> folders)
                   throws IOException

See GoogleCloudStorage.deleteFolders(List) for details about expected behavior.

Specified by:

deleteFolders in interface GoogleCloudStorage

Parameters:

folders - names of folder resources to delete

Throws:

IOException - if folder exists but cannot be deleted

validateCopyArguments

public static void validateCopyArguments(Map<StorageResourceId,StorageResourceId> sourceToDestinationObjectsMap,
                                         GoogleCloudStorage gcsImpl)
                                  throws IOException

Validates basic argument constraints like non-null, non-empty Strings, using Preconditions in addition to checking for src/dst bucket existence and compatibility of bucket properties such as location and storage-class.

Parameters:

gcsImpl - A GoogleCloudStorage for retrieving bucket info via getItemInfo, but only if srcBucketName != dstBucketName; passed as a parameter so that this static method can be used by other implementations of GoogleCloudStorage that want to preserve the validation behavior of GoogleCloudStorageImpl, including disallowing cross-location copies.

Throws:

IOException

validateMoveArguments

public static void validateMoveArguments(Map<StorageResourceId,StorageResourceId> sourceToDestinationObjectsMap)
                                  throws IOException

Validates basic argument constraints like non-null, non-empty Strings, using Preconditions in addition to checking for src/dst bucket equality.

Throws:

IOException

copy

public void copy(String srcBucketName,
                 List<String> srcObjectNames,
                 String dstBucketName,
                 List<String> dstObjectNames)
          throws IOException

See GoogleCloudStorage.copy(String, List, String, List) for details about expected behavior.

Specified by:

copy in interface GoogleCloudStorage

Parameters:

srcBucketName - name of the bucket containing the objects to copy

srcObjectNames - names of the objects to copy

dstBucketName - name of the bucket to copy to

dstObjectNames - names of the objects after copy

Throws:

FileNotFoundException - if the source object or the destination bucket does not exist

IOException - in all other error cases

copy

public void copy(Map<StorageResourceId,StorageResourceId> sourceToDestinationObjectsMap)
          throws IOException

See GoogleCloudStorage.copy(String, List, String, List) for details about expected behavior.

Specified by:

copy in interface GoogleCloudStorage

Parameters:

sourceToDestinationObjectsMap - map of destination objects to be copied, keyed by source

Throws:

FileNotFoundException - if the source object or the destination bucket does not exist

IOException - in all other error cases

move

public void move(Map<StorageResourceId,StorageResourceId> sourceToDestinationObjectsMap)
          throws IOException

See GoogleCloudStorage#move(Map) for details about expected behavior.

Specified by:

move in interface GoogleCloudStorage

Parameters:

sourceToDestinationObjectsMap - map of destination objects to be moved, keyed by source

Throws:

FileNotFoundException - if the source object or the destination bucket does not exist

IOException - in all other error cases

listBucketNames

public List<String> listBucketNames()
                             throws IOException

See GoogleCloudStorage.listBucketNames() for details about expected behavior.

Specified by:

listBucketNames in interface GoogleCloudStorage

Throws:

IOException

listBucketInfo

public List<GoogleCloudStorageItemInfo> listBucketInfo()
                                                throws IOException

See GoogleCloudStorage.listBucketInfo() for details about expected behavior.

Specified by:

listBucketInfo in interface GoogleCloudStorage

Throws:

IOException

listObjectInfo

public List<GoogleCloudStorageItemInfo> listObjectInfo(String bucketName,
                                                       String objectNamePrefix,
                                                       ListObjectOptions listOptions)
                                                throws IOException

Description copied from interface: GoogleCloudStorage

Lists GoogleCloudStorageItemInfo of objects contained in the given bucket and whose names begin with the given prefix.

Note: Although GCS does not implement a file system, it treats objects that contain a delimiter (ListObjectOptions.getDelimiter()) as different from other objects when listing objects. This will be clearer with an example.

Consider a bucket with objects: o1, d1/, d1/o1, d1/o2

• With prefix == null and delimiter == /, we get: d1/, o1
• With prefix == null and delimiter == null, we get: o1, d1/, d1/o1, d1/o2

Thus when delimiter is null, the entire key name is considered an opaque string, otherwise only the part up to the first delimiter is considered.

Specified by:

listObjectInfo in interface GoogleCloudStorage

Parameters:

bucketName - bucket name

objectNamePrefix - object name prefix or null if all objects in the bucket are desired

listOptions - options to use when listing objects

Returns:

list of objects

Throws:

IOException - on IO error

See Also:

GoogleCloudStorage.listObjectInfo(String, String, ListObjectOptions)

listObjectInfoStartingFrom

public List<GoogleCloudStorageItemInfo> listObjectInfoStartingFrom(String bucketName,
                                                                   String startOffset,
                                                                   ListObjectOptions listOptions)
                                                            throws IOException

Description copied from interface: GoogleCloudStorage

Lists GoogleCloudStorageItemInfo of objects contained in the given bucket and their name is lexicographically greater than or equal the provided offset.

Note: As GCS doesn't implement a file system, directory is also treated as an object (if it's been created). This APi filters out all those directory object and maintain the order of items. This APi strictly expects delimiter in listOptions to be not set.

Consider a bucket with objects: o1, d1/, d1/o1, d1/o2

• With startOffset == "o1" , we get: o1
• With startOffset == "d1/" , we get: d1/o1 d1/o2
• With startOffset == "d1/"o1 , we get: d1/o1 d1/o2

  This is an experimental API and can change without notice.

Specified by:

listObjectInfoStartingFrom in interface GoogleCloudStorage

Parameters:

bucketName - bucket name

startOffset - offset sting, all object with name greater and equal will be listed.

listOptions - options to use when listing objects

Returns:

list of objects

Throws:

IOException - on IO error

listObjectInfoPage

public GoogleCloudStorage.ListPage<GoogleCloudStorageItemInfo> listObjectInfoPage(String bucketName,
                                                                                  String objectNamePrefix,
                                                                                  ListObjectOptions listOptions,
                                                                                  String pageToken)
                                                                           throws IOException

Description copied from interface: GoogleCloudStorage

The same semantics as GoogleCloudStorage.listObjectInfo(java.lang.String, java.lang.String), but returns only result of single list request (1 page).

Specified by:

listObjectInfoPage in interface GoogleCloudStorage

Parameters:

bucketName - bucket name

objectNamePrefix - object name prefix or null if all objects in the bucket are desired

listOptions - options to use when listing objects

pageToken - the page token

Returns:

GoogleCloudStorage.ListPage object with listed GoogleCloudStorageItemInfos and next page token if any

Throws:

IOException - on IO error

See Also:

GoogleCloudStorage.listObjectInfoPage(String, String, ListObjectOptions, String)

listFolderInfoForPrefixPage

public GoogleCloudStorage.ListPage<FolderInfo> listFolderInfoForPrefixPage(String bucketName,
                                                                           String objectNamePrefix,
                                                                           ListFolderOptions listFolderOptions,
                                                                           String pageToken)
                                                                    throws IOException

Description copied from interface: GoogleCloudStorage

Returns the list of folder resources. Applicable only for HN enabled bucket

Specified by:

listFolderInfoForPrefixPage in interface GoogleCloudStorage

Parameters:

bucketName - bucket name

objectNamePrefix - folder resource name prefix

listFolderOptions - options to use when listing folder resources

pageToken - the page token

Returns:

GoogleCloudStorage.ListPage folder resources with listed Folders

Throws:

IOException - on IO error

See Also:

GoogleCloudStorage.listFolderInfoForPrefixPage(String, String, ListFolderOptions, String)

createItemInfoForBucket

public static GoogleCloudStorageItemInfo createItemInfoForBucket(StorageResourceId resourceId,
                                                                 com.google.api.services.storage.model.Bucket bucket)

Helper for converting a StorageResourceId + Bucket into a GoogleCloudStorageItemInfo.

createItemInfoForStorageObject

public static GoogleCloudStorageItemInfo createItemInfoForStorageObject(com.google.api.services.storage.model.StorageObject object)

createItemInfoForStorageObject

public static GoogleCloudStorageItemInfo createItemInfoForStorageObject(StorageResourceId resourceId,
                                                                        com.google.api.services.storage.model.StorageObject object)

Helper for converting a StorageResourceId + StorageObject into a GoogleCloudStorageItemInfo.

getItemInfos

public List<GoogleCloudStorageItemInfo> getItemInfos(List<StorageResourceId> resourceIds)
                                              throws IOException

See GoogleCloudStorage.getItemInfos(List) for details about expected behavior.

Specified by:

getItemInfos in interface GoogleCloudStorage

Parameters:

resourceIds - names of the GCS StorageObjects or Buckets for which to retrieve info.

Returns:

information about the given resourceIds.

Throws:

IOException - on IO error

updateItems

public List<GoogleCloudStorageItemInfo> updateItems(List<UpdatableItemInfo> itemInfoList)
                                             throws IOException

Description copied from interface: GoogleCloudStorage

Attempt to update metadata of the objects referenced within the passed itemInfo objects.

Specified by:

updateItems in interface GoogleCloudStorage

Returns:

Updated GoogleCloudStorageItemInfo objects for the referenced objects.

Throws:

IOException - on IO error

getItemInfo

public GoogleCloudStorageItemInfo getItemInfo(StorageResourceId resourceId)
                                       throws IOException

See GoogleCloudStorage.getItemInfo(StorageResourceId) for details about expected behavior.

Specified by:

getItemInfo in interface GoogleCloudStorage

Parameters:

resourceId - identifies either root, a Bucket, or a StorageObject

Returns:

information about the given item

Throws:

IOException - on IO error

close

public void close()

See GoogleCloudStorage.close() for details about expected behavior.

Specified by:

close in interface GoogleCloudStorage

isHnBucket

public boolean isHnBucket(URI src)
                   throws IOException

Description copied from interface: GoogleCloudStorage

Checks if resourceId belongs to a Hierarchical namespace enabled bucket. This takes a path and not the bucket name since the caller may not have permission to query the bucket.

Specified by:

isHnBucket in interface GoogleCloudStorage

Parameters:

src - Path for which the check need to be performed

Returns:

Throws:

IOException

getFolderInfo

public GoogleCloudStorageItemInfo getFolderInfo(StorageResourceId resourceId)
                                         throws IOException

See GoogleCloudStorage.getFolderInfo(StorageResourceId) for details about expected behavior.

Specified by:

getFolderInfo in interface GoogleCloudStorage

Parameters:

resourceId - The StorageResourceId of the folder.

Throws:

IOException - on IO error.

createFolder

public void createFolder(StorageResourceId resourceId,
                         boolean recursive)
                  throws IOException

See GoogleCloudStorage.createFolder(StorageResourceId,boolean) for details about expected behavior.

Specified by:

createFolder in interface GoogleCloudStorage

Parameters:

resourceId - The StorageResourceId of the folder to create.

recursive - If true, creates all nonexistent parent folders in the path.

Throws:

IOException - if the folder cannot be created, or if it already exists and is not a folder.

renameHnFolder

public void renameHnFolder(URI src,
                           URI dst)
                    throws IOException

Description copied from interface: GoogleCloudStorage

Renames src to dst using the rename LRO API. This should be called only on an Hierarchical namespace enabled bucket.

Specified by:

renameHnFolder in interface GoogleCloudStorage

Parameters:

src - source path

dst - destination path

Throws:

IOException

compose

public void compose(String bucketName,
                    List<String> sources,
                    String destination,
                    String contentType)
             throws IOException

Description copied from interface: GoogleCloudStorage

Composes inputs into a single GCS object. This performs a GCS Compose. Objects will be composed according to the order they appear in the input. The destination object, if already present, will be overwritten. Sources and destination are assumed to be in the same bucket.

Specified by:

compose in interface GoogleCloudStorage

Parameters:

bucketName - name of the bucket containing the sources and the destination

sources - names of the objects to be composed

destination - name of the resulting object

contentType - content-type of composed object

Throws:

IOException - if the Compose operation was unsuccessful

composeObjects

public GoogleCloudStorageItemInfo composeObjects(List<StorageResourceId> sources,
                                                 StorageResourceId destination,
                                                 CreateObjectOptions options)
                                          throws IOException

Description copied from interface: GoogleCloudStorage

Composes inputs into a single GCS object. This performs a GCS Compose. Objects will be composed according to the order they appear in the input. The destination object will have metadata set according to options. Overwrite semantics for the destination object will follow the same semantics as GoogleCloudStorage.create(StorageResourceId, CreateObjectOptions). See GoogleCloudStorage.create(StorageResourceId) for the behavior if StorageResourceId.getGenerationId() is explicitly set. The bucket must be the same for all sources and the destination.

Specified by:

composeObjects in interface GoogleCloudStorage

Throws:

IOException

getStatistics

public Map<String,Long> getStatistics()

Description copied from interface: GoogleCloudStorage

Retrieves the statistics associated with the GoogleCloudStorage instance.

Specified by:

getStatistics in interface GoogleCloudStorage

builder

public static GoogleCloudStorageImpl.Builder builder()