Class StorageObject

java.lang.Object
org.jets3t.service.model.BaseStorageItem
org.jets3t.service.model.StorageObject
All Implemented Interfaces:
Cloneable
Direct Known Subclasses:
GSObject, S3Object

public class StorageObject extends BaseStorageItem implements Cloneable
A generic storage object.
Author:
James Murty
  • Field Details

  • Constructor Details

    • StorageObject

      public StorageObject(File file) throws NoSuchAlgorithmException, IOException
      Create an object representing a file. The object is initialised with the file's name as its key, the file's content as its data, a content type based on the file's extension (see Mimetypes), and a content length matching the file's size. The file's MD5 hash value is also calculated and provided to the destination service, so the service can verify that no data are corrupted in transit.

      NOTE: The automatic calculation of a file's MD5 hash digest as performed by this constructor could take some time for large files, or for many small ones.

      Parameters:
      file - the file the object will represent. This file must exist and be readable.
      Throws:
      IOException - when an i/o error occurred reading the file
      NoSuchAlgorithmException - when this JRE doesn't support the MD5 hash algorithm
    • StorageObject

      public StorageObject(String key, String dataString) throws NoSuchAlgorithmException, IOException
      Create an object representing text data. The object is initialized with the given key, the given string as its data content (encoded as UTF-8), a content type of text/plain; charset=utf-8, and a content length matching the string's length. The given string's MD5 hash value is also calculated and provided to the target service, so the service can verify that no data are corrupted in transit.

      NOTE: The automatic calculation of the MD5 hash digest as performed by this constructor could take some time for large strings, or for many small ones.

      Parameters:
      key - the key name for the object.
      dataString - the text data the object will contain. Text data will be encoded as UTF-8. This string cannot be null.
      Throws:
      IOException
      NoSuchAlgorithmException - when this JRE doesn't support the MD5 hash algorithm
    • StorageObject

      public StorageObject(String key, byte[] data) throws NoSuchAlgorithmException, IOException
      Create an object representing binary data. The object is initialized with the given key, the bytes as its data content, a content type of application/octet-stream, and a content length matching the byte array's length. The MD5 hash value of the byte data is also calculated and provided to the target service, so the service can verify that no data are corrupted in transit.
      Parameters:
      key - the key name for the object.
      data - the byte data the object will contain, cannot be null.
      Throws:
      IOException
      NoSuchAlgorithmException - when this JRE doesn't support the MD5 hash algorithm
    • StorageObject

      public StorageObject(String key)
      Create an object without any associated data.
      Parameters:
      key - the key name for the object.
    • StorageObject

      public StorageObject()
      Create an object without any associated information whatsoever.
  • Method Details

    • clone

      public Object clone()
    • toString

      public String toString()
      Overrides:
      toString in class Object
    • getBucketName

      public String getBucketName()
      Returns:
      the name of the bucket this object belongs to or will be placed into, or null if none is set.
    • setBucketName

      public void setBucketName(String bucketName)
      Set the name of the bucket this object belongs to or will be placed into.
      Parameters:
      bucketName - the name for the bucket.
    • getDataInputStream

      public InputStream getDataInputStream() throws ServiceException
      Returns an input stream containing this object's data, or null if there is no data associated with the object.

      If you are downloading data from a service, you should consider verifying the integrity of the data you read from this stream using one of the verifyData(InputStream) methods.

      Returns:
      input stream containing the object's service-side data, or null if no data.
      Throws:
      ServiceException
    • setDataInputStream

      public void setDataInputStream(InputStream dataInputStream)
      Sets an input stream containing the data content to associate with this object.

      Note: If the data content comes from a file, use the alternate method setDataInputFile(File) which allows objects to lazily open files and avoid any Operating System limits on the number of files that may be opened simultaneously.

      Note 2: This method does not calculate an MD5 hash of the input data, which means the target service will not be able to recognize if data are corrupted in transit. To allow the target service to verify data you upload, you should set the MD5 hash value of your data using setMd5Hash(byte[]).

      This method will set the object's file data reference to null.

      Parameters:
      dataInputStream - an input stream containing the object's data.
    • setDataInputFile

      public void setDataInputFile(File dataInputFile)
      Sets the file containing the data content to associate with this object. This file will be automatically opened as an input stream only when absolutely necessary, that is when getDataInputStream() is called.

      Note 2: This method does not calculate an MD5 hash of the input data, which means the target service will not be able to recognize if data are corrupted in transit. To allow the target service to verify data you upload, you should set the MD5 hash value of your data using setMd5Hash(byte[]).

      This method will set the object's input stream data reference to null.

      Parameters:
      dataInputFile - a file containing the object's data.
    • getDataInputFile

      public File getDataInputFile()
      Returns:
      Return the file that contains this object's data, if such a file has been provided. Null otherwise.
    • closeDataInputStream

      public void closeDataInputStream() throws IOException
      Closes the object's data input stream if it exists.
      Throws:
      IOException
    • getETag

      public String getETag()
      Returns:
      the ETag value of the object as returned by the service when an object is created. The ETag value does not include quote (") characters. This value will be null if the object's ETag value is not known, such as when an object has not yet been uploaded to the service.
    • setETag

      public void setETag(String etag)
      Set the ETag value of the object based on information returned from the service. This method should only by used by code that reads service responses.
      Parameters:
      etag - the ETag value as provided by the service.
    • getMd5HashAsHex

      public String getMd5HashAsHex()
      Returns:
      the hex-encoded MD5 hash of an object's data contents as stored in the JEtS3t-specific metadata item md5-hash, or null if the hash value is not available.
    • getMd5HashAsBase64

      public String getMd5HashAsBase64()
      Returns:
      the Base64-encoded MD5 hash of an object's data contents as stored in the metadata item Content-MD5, or as derived from an ETag or md5-hash hex-encoded version of the hash. Returns null if the hash value is not available.
    • setMd5Hash

      public void setMd5Hash(byte[] md5Hash)
      Set the MD5 hash value of this object's data. The hash value is stored as metadata under Content-MD5 (Base64-encoded) and the JetS3t-specific md5-hash (Hex-encoded).
      Parameters:
      md5Hash - the MD5 hash value of the object's data.
    • getLastModifiedDate

      public Date getLastModifiedDate()
      Returns:
      the last modified date of this object, as provided by the service. If the last modified date is not available (e.g. if the object has only just been created) the object's creation date is returned instead. If both last modified and creation dates are unavailable, null is returned.
    • setLastModifiedDate

      public void setLastModifiedDate(Date lastModifiedDate)
      Set this object's last modified date based on information returned from the service. This method should only by used internally by code that reads the last modified date from a service response; it must not be set prior to uploading data to the service.
      Parameters:
      lastModifiedDate -
    • getContentLength

      public long getContentLength()
      Returns:
      the content length, or size, of this object's data, or 0 if it is unknown.
    • setContentLength

      public void setContentLength(long size)
      Set this object's content length. The content length is set internally by JetS3t for objects that are retrieved from a service. For objects that are uploaded, JetS3t automatically calculates the content length if the data is provided to the String- or File-based object constructor. If you manually provide data to this object via the setDataInputStream(InputStream) or setDataInputFile(File) methods, you must also set the content length value.
      Parameters:
      size -
    • getContentType

      public String getContentType()
      Returns:
      the content type of the object
    • setContentType

      public void setContentType(String contentType)
      Set the content type of the object. JetS3t can help you determine the content type when the associated data is a File (see Mimetypes). You should set the content type for associated String or InputStream data.
      Parameters:
      contentType -
    • getContentLanguage

      public String getContentLanguage()
      Returns:
      the content language of this object, or null if it is unknown.
    • setContentLanguage

      public void setContentLanguage(String contentLanguage)
      Set the content language of the object.
      Parameters:
      contentLanguage -
    • getContentDisposition

      public String getContentDisposition()
      Returns:
      the content disposition of this object, or null if it is unknown.
    • setContentDisposition

      public void setContentDisposition(String contentDisposition)
      Set the content disposition of the object.
      Parameters:
      contentDisposition -
    • getContentEncoding

      public String getContentEncoding()
      Returns:
      the content encoding of this object, or null if it is unknown.
    • setContentEncoding

      public void setContentEncoding(String contentEncoding)
      Set the content encoding of this object.
      Parameters:
      contentEncoding -
    • getKey

      public String getKey()
      Returns:
      the key of this object.
    • setKey

      public void setKey(String key)
      Set the key of this object.
      Parameters:
      key - the key for this object.
    • getAcl

      public AccessControlList getAcl()
      Returns:
      the object's ACL, or null if it is unknown.
    • setAcl

      public void setAcl(AccessControlList acl)
      Set the object's ACL.
      Parameters:
      acl -
    • getStorageClass

      public String getStorageClass()
      Returns:
      the storage class of the object.
    • setStorageClass

      public void setStorageClass(String storageClass)
      Set the storage class for this object.
      Parameters:
      storageClass -
    • isMetadataComplete

      public boolean isMetadataComplete()
      Returns:
      true if the object's metadata are considered complete, such as when the object's metadata has been retrieved from the service by a HEAD request. If this value is not true, the metadata information in this object should not be considered authoritative.
    • setMetadataComplete

      public void setMetadataComplete(boolean isMetadataComplete)
      Object metadata are only complete when it is populated with all values following a HEAD or GET request. This method should only by used by code that reads service responses.
      Parameters:
      isMetadataComplete -
    • addMetadata

      public void addMetadata(String name, String value)
      Add metadata information to the object. If date metadata items (as recognized by name) are added and the value is not a date the value is parsed as an RFC 822 or ISO 8601 string.
      Overrides:
      addMetadata in class BaseStorageItem
      Parameters:
      name -
      value -
    • addAllMetadata

      public void addAllMetadata(Map<String,Object> metadata)
      Add all the metadata information to the object from the provided map.
      Overrides:
      addAllMetadata in class BaseStorageItem
      Parameters:
      metadata -
    • getModifiableMetadata

      public Map<String,Object> getModifiableMetadata()
      Returns only those object metadata items that can be modified in a service. This list excludes those that are set by the the service, and those that are specific to a particular HTTP request/response session (such as request identifiers).
      Returns:
      the limited set of metadata items that users can control.
    • isDirectoryPlaceholder

      public boolean isDirectoryPlaceholder()
    • verifyData

      public boolean verifyData(File downloadedFile) throws NoSuchAlgorithmException, FileNotFoundException, IOException
      Calculates the MD5 hash value of the given data object, and compares it against this object's hash (as stored in the Content-MD5 header for uploads, or the ETag header for downloads).
      Parameters:
      downloadedFile -
      Returns:
      true if the calculated MD5 hash value of the file matches this object's hash value, false otherwise.
      Throws:
      NoSuchAlgorithmException
      FileNotFoundException
      IOException
    • verifyData

      public boolean verifyData(byte[] downloadedData) throws NoSuchAlgorithmException, FileNotFoundException, IOException
      Calculates the MD5 hash value of the given data object, and compares it against this object's hash (as stored in the Content-MD5 header for uploads, or the ETag header for downloads).
      Parameters:
      downloadedData -
      Returns:
      true if the calculated MD5 hash value of the bytes matches this object's hash value, false otherwise.
      Throws:
      NoSuchAlgorithmException
      FileNotFoundException
      IOException
    • verifyData

      public boolean verifyData(InputStream downloadedDataStream) throws NoSuchAlgorithmException, FileNotFoundException, IOException
      Calculates the MD5 hash value of the given data object, and compares it against this object's hash (as stored in the Content-MD5 header for uploads, or the ETag header for downloads).
      Parameters:
      downloadedDataStream - the input stream of a downloaded object.
      Returns:
      true if the calculated MD5 hash value of the input stream matches this object's hash value, false otherwise.
      Throws:
      NoSuchAlgorithmException
      FileNotFoundException
      IOException