dolmen.blob 0.5.0

兼容性

为了确保blobfile的功能，我们测试它 针对一些常见的用途，由zope.file.file.file和 dolmen.file.namedfile ：

>>> from dolmen.blob import BlobFile, IBlobFile

>>> blob = BlobFile()
>>> print blob.contentType
application/octet-stream
>>> blob.data
''
>>> blob.filename
u''

>>> blob = BlobFile(data='mydata', filename="foo.txt")
>>> blob.filename
u'foo.txt'
>>> blob.data
'mydata'
>>> blob.contentType
'text/plain'
>>> blob.mimeType
'text/plain'

>>> blob = BlobFile(data=u'some random data', filename="foo.txt")
>>> blob.filename
u'foo.txt'
>>> blob.data
'some random data'

>>> blob = BlobFile(contentType="plain/text")
>>> blob.filename
u''
>>> blob.data
''
>>> blob.contentType
'plain/text'

>>> import cStringIO
>>> data = cStringIO.StringIO("mydata")
>>> blob = BlobFile(data=data)
>>> blob.data
'mydata'
>>> blob.size
6

>>> from zope.size.interfaces import ISized
>>> sized = ISized(blob)
>>> sized
<dolmen.file.size.Sized object at ...>
>>> sized.sizeForDisplay()
u'1 KB'
>>> sized.sizeForSorting()
('byte', 6)

>>> from zope.filerepresentation.interfaces import IReadFile, IWriteFile
>>> reader = IReadFile(blob)
>>> writer = IWriteFile(blob)

>>> reader.read()
'mydata'
>>> reader.size()
6

>>> writer.write('changing data')
>>> reader.read()
'changing data'
>>> reader.size()
13

让我们深入验证实现：

>>> from dolmen.file import INamedFile
>>> from zope.interface import verify
>>> import zope.file

>>> blob = BlobFile(data='my data')
>>> verify.verifyObject(IBlobFile, blob)
True
>>> verify.verifyObject(INamedFile, blob)
True
>>> verify.verifyObject(zope.file.interfaces.IFile, blob)
True