Changeset 32337 for branches/eam_branches/ipp-20110710/ippToPsps/jython/fits.py

Timestamp:

Sep 6, 2011, 11:00:22 AM (15 years ago)

Author:

eugene

Message:

merge changes from trunk

Location:

branches/eam_branches/ipp-20110710/ippToPsps/jython

Files:

• . (modified) (1 prop)
• fits.py (modified) (4 diffs)

branches/eam_branches/ipp-20110710/ippToPsps/jython/fits.py

@@ -17 +17 @@
     def __init__(self, logger, doc, originalPath):
 
+       # set class variables
        self.originalPath = originalPath
        self.logger = logger
        self.doc = doc
+       self.header = None
        self.localDir = self.doc.find("localOutPath").text
 
-       # does it exist?
+       # does this file even exist?
        if not os.path.isfile(self.originalPath): 
-           self.logger.error("Cannot read file at '" + self.originalPath + "'")
+           self.logger.errorPair("Cannot read file", self.originalPath)
            return
 
-       self.logger.infoPair("FITS file", self.originalPath)
+       # ok, we have a file, now copy it locally to save on NFS overhead
+       self.logger.debugPair("FITS file", self.originalPath)
        self.localCopyPath = self.localDir + "/temp.fits"
        shutil.copy2(self.originalPath, self.localCopyPath)
 
+       # open the local copy and parse the ridiculou plain-text header
        self.file = open(self.localCopyPath)
        self.header = self.parseHeader()
-       self.logger.infoPair("FITS local copy", self.localCopyPath)
-       self.logger.infoPair("FITS primary header", "%d cards found" % len(self.header))
+       self.logger.debugPair("FITS local copy", self.localCopyPath)
+       self.logger.debugPair("FITS primary header", "%d cards found" % len(self.header))
+
+       # move file pointer back to the start of the file
        self.rewindToStart()
 
     '''
-    Returns the path to this FITS file
+    Returns count of 'cards' found in primary header
+    '''
+    def getPrimaryHeaderCardCount(self):
+        return len(self.header)
+
+    '''
+    Returns the path to the LOCAL COPY of this FITS file
     '''
     def getPath(self):
         return self.localCopyPath
+
+    '''
+    Returns the path to the LOCAL COPY of this FITS file
+    '''
+    def getOriginalPath(self):
+        return self.originalPath
 
     '''
@@ -57 +75 @@
         else: return "NULL"
 
-
+    '''
+    Moves the file pointer back to the start of this file
+    '''
     def rewindToStart(self):
         self.file.seek(0, 0)
@@ -63 +83 @@
 
     '''
-    Finds and reads a header extension
+    Finds and reads a header extension.
+
+    2880 is the magic number that the FITS format uses to break up data: extensions always begin on multiples of 2880 bytes
     '''
     def findAndReadHeader(self, name):
@@ -91 +113 @@
 
             self.file.seek(origIndex, 0)
-            self.logger.error("...could not read header in extension '" + name + "'")
+            self.logger.errorPair("Could not read header", name)
             return
-    #else: self.logger.info("...read header at '" + name + "' and found " + str(len(header)) + " header cards") 
+        else: 
+            self.logger.debug("...read header at '" + name + "' and found " + str(len(header)) + " header cards") 
 
         return header