def _build_volume ( self, file_name ):
""" Creates the image volume using the specified file name and the
current user supplied information and input files.
"""
# Set the current status:
self.status = 'Saving to %s...' % file_name
# Create an image volume to hold the information collected. Note that we
# set a bogus time stamp to force the ImageLibrary to reload all of the
# image information from the actual files so that we end up with the
# correct image sizes:
volume = ImageVolume(
category = self.category,
keywords = self.keywords,
time_stamp = time_stamp_for( 0.0 ),
info = [ ImageVolumeInfo(
description = self.description,
copyright = self.copyright,
license = self.license ) ]
)
# Create an ImageInfo descriptor for each image file that will become
# part of the volume:
volume_name = splitext( basename( file_name ) )[0]
volume.images = [ ImageInfo(
name = item.image_name,
image_name = '@%s:%s' % ( volume_name,
item.image_name ),
description = self.image_description,
category = self.image_category,
keywords = self.image_keywords )
for item in self.build_files ]
# Pre-compute the images code, because it can require a long time
# to load all of the images so that we can determine their size, and we
# don't want that time to interfere with the time stamp of the image
# volume:
images_code = volume.images_code
# Create the new zip file:
zf = ZipFile( file_name, 'w', ZIP_DEFLATED )
# Assume that an error will occur:
error = True
fh = None
try:
# Copy all of the image files from the file system to the new zip
# file:
for item in self.build_files:
fh = file( item.file_name, 'rb' )
data = fh.read()
fh.close()
fh = None
zf.writestr( item.image_name, data )
# Write the volume manifest source code to the zip file:
zf.writestr( 'image_volume.py', volume.image_volume_code )
# Write the image info source code to the zip file:
zf.writestr( 'image_info.py', images_code )
# Done creating the new zip file:
zf.close()
zf = None
# Add the new image volume to the image library:
ImageLibrary.add_volume( file_name )
# Now invoke the normal volume save so that it can add the correct
# image info data and license file:
volume = [ volume for volume in ImageLibrary.volumes
if volume.path == file_name ][0]
volume.path = file_name
volume.zip_file = FastZipFile( path = file_name )
volume.save()
# Set the final status:
self.status = '%s has been saved successfully.' % file_name
# Indicate no errors occurred:
error = False
finally:
if fh is not None:
fh.close()
if zf is not None:
zf.close()
if error:
self.status = 'An error occurred trying to save %s.' % file_name
remove( file_name )
