[hdf-compass] 04/295: finished implementing Store class for ASCII Grid model

[Ghislain Vaillant]

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ghisvail-guest pushed a commit to branch debian/master
in repository hdf-compass.

commit 0a9c65602462e46114c5ea6447df0c5ce390823f
Author: Matt Comerford <matthew.comerford at colorado.edu>
Date:   Wed Jun 18 14:26:50 2014 -0600

    finished implementing Store class for ASCII Grid model
---
 asc_model/__init__.py | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)

diff --git a/asc_model/__init__.py b/asc_model/__init__.py
new file mode 100644
index 0000000..fda3ab6
--- /dev/null
+++ b/asc_model/__init__.py
@@ -0,0 +1,89 @@
+import os
+import os.path as op
+import numpy as np
+
+import compass_model
+
+'''
+That sounds like a great place to start.  Here are some more explicit
+requirements for your "pilot" plugin:
+
+1. The user should be able to browse the filesystem (you can borrow
+code from the "filesystem" plugin for this).  You'll need to implement
+two classes: a subclass of Container (to handle directories), and a
+subclass of Array (to handle the csv files).
+
+2. The user should be able to load array data from files with the
+".csv" extension (hint: use out the canhandle() static method so your
+class is only associated with ".csv" files).
+
+3. Values in the text file must be read in and displayed with the
+array control.  You can assume comma-delimited data with
+newline-separated rows; for example, this 2 x 3 array:
+
+1,2,3
+4,5,6
+
+You should implement the plugin as a new top-level package, let's call
+it "csv_model", similar in structure to "hdf5_model" and
+"filesystem_model".  Some hints on testing:
+
+1. in analogy to the filesystem and array plugins (file://localhost
+and array://localhost), you can have your Store subclass respond to
+"csv://localhost" URLS.
+2. To make the viewer aware of your plugin (so the "csv://localhost"
+URL can actually be opened), add "import csv_model" to the import
+statements in the run() function of compass_viewer/__init__.py.
+
+Also may be useful for the actual reading:
+
+http://docs.scipy.org/doc/numpy/reference/generated/numpy.loadtxt.html
+
+Give it a shot and let me know if you run into problems.
+'''
+
+class Filesystem(compass_model.Store):
+	"""
+		A "data store" represented by the file system.
+
+		Keys are absolute paths on the local file system.
+	"""
+
+	def __contains__(self, key):
+		return op.exists(key)
+
+	@property
+	def url(self):
+		return self._url
+
+	@property
+	def displayname(self):
+		return "Local File System"
+
+	@property
+	def root(self):
+		return self['/']
+
+	@property
+	def valid(self):
+		return self._valid
+
+	@staticmethod
+	def canhandle(url):
+		if url == "asc://localhost":
+			return True
+		return False
+
+	def __init__(self, url):
+		if not self.canhandle(url):
+			raise ValueError(url)
+		self._url = url
+		self._value = True
+
+	def close(self):
+		self._valid = False
+
+	def getparent(self, key):
+		if key == '/':
+			return None
+		return self[op.dirname(key)]
\ No newline at end of file

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