def single_from_id(author_num, unigraph, cutoff):
"""
Takes node id, full graph and cutoff and returns graph with all nodes reachable by source node up to a distance of cutoff
"""
# make full node id
author_id = "http://eprints.gla.ac.uk/view/author/" + author_num + ".html"
# Node not found, return error message
if author_id not in graph_utils.get_node_set(unigraph):
errorMessage = json.dumps({"error": "Sorry, the author was not found"})
return HttpResponse(errorMessage, content_type='application/json')
# Make and return single author graph
author_graph = graph_utils.single_author_graph(unigraph, author_id, cutoff)
graphdata = graph_utils.json_from_graph(author_graph)
newdata = json.dumps(graphdata)
return HttpResponse(newdata, content_type='application/json')
def longest_from_id(source_num, unigraph):
"""
Takes the id for a node and a graph and returns a graph of the node's path to its furthest reachable node
"""
# Make full node id out of the id number
source_id = "http://eprints.gla.ac.uk/view/author/" + source_num + ".html"
# Check if node in graph, if not return error message
if source_id not in graph_utils.get_node_set(unigraph):
errorMessage = json.dumps({"error": "Sorry, the author was not found"})
return HttpResponse(errorMessage, content_type='application/json')
# Otherwise get longest path and make and return path graph
longest_path = graph_utils.get_longest_path(unigraph, source_id)
path_graph = graph_utils.make_path_graph(longest_path, unigraph)
graphdata = graph_utils.json_from_graph(path_graph)
newdata = json.dumps(graphdata)
return HttpResponse(newdata, content_type='application/json')
def path_graph_from_ids(source_num, target_num, unigraph):
"""
Takes the node ids for source and target and the graph and returns a graph for the path between source and target
"""
# Use the ids provided to make urls (which are the actual node ids used in the graph)
source_id = "http://eprints.gla.ac.uk/view/author/" + source_num + ".html"
target_id = "http://eprints.gla.ac.uk/view/author/" + target_num + ".html"
# Get the set of nodes in the graph to check for the source and target
uni_node_set = graph_utils.get_node_set(unigraph)
# Check if source and target in graph, if not return error message
if source_id not in uni_node_set and target_id not in uni_node_set:
errorMessage = json.dumps({"error": "Sorry, neither author was found"})
return HttpResponse(errorMessage, content_type='application/json')
elif source_id not in uni_node_set:
errorMessage = json.dumps({"error": "Sorry, the source author was not found"})
return HttpResponse(errorMessage, content_type='application/json')
elif target_id not in uni_node_set:
errorMessage = json.dumps({"error": "Sorry, the target author was not found"})
return HttpResponse(errorMessage, content_type='application/json')
# If both were found, get the path betwen them
s_path = graph_utils.get_path(unigraph, source_id, target_id)
# If s_path is false, no path was found between the authors, return error message
if not s_path:
errorMessage = json.dumps({"error": "Sorry, no path was found between the authors"})
return HttpResponse(errorMessage, content_type='application/json')
# Otherwise make a graph connecting the path between the authors and return
path_graph = graph_utils.make_path_graph(s_path, unigraph)
graphdata = graph_utils.json_from_graph(path_graph)
newdata = json.dumps(graphdata)
return HttpResponse(newdata, content_type='application/json')