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https://issues.apache.org/jira/browse/FLINK-1815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15349585#comment-15349585
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Faye Beligianni edited comment on FLINK-1815 at 6/25/16 10:15 AM:
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I faced the following problem when I try to test the scala
{{fromAdjacencyListFile}} method.
The {{fromAdjacencyListFile}} scala method is actually a wrapper of the
corresponding java code.
In the scala test method, I create a temporary file which represents the
Adjacency List formatted text file,like this:
{code:java}
val adjFileContent = "0-Node0\t1-0.1,4-0.2,5-0.3\n" + "1-Node1\t2-0.3\n" +
"2-Node2 3-0.3\n" + "3-Node3 \n" + "4-Node4\n" + "5-Node5 6-0.7\n" +
"6-Node6 3-0.2\n" +
"7-Node7 4-0.1\n" + "8-Node8 0-0.2\n"
val adjFileSplit = createTempFile(adjFileContent)
{code}
Just for clarification, in the "0-Node0\t1-0.1,4-0.2,5-0.3\n" line of a
Adjacency list formatted text file:
srcvertex-id : 0
srcVertex-value : Node0
neighbours : 1,4,5 , with 0.1,0.2,0.3 being the corresponding edge values for
each edge between the srcVertex and its neighbours.
When I read the file and split each line of the file, in order to create the
graph, I noticed that I can split the srcVertex from its neighbours, when there
is a "\t" character, but not when I have just a whitespace character (" "). I
didn't faced this problem in the java tests.
I use the split method in order to split the lines in the specified delimiters.
{code:java}
line.split("\\s+")
{code}
Any suggestions on how to handle this?
was (Author: fobeligi):
I faced the following problem when I try to test the scala
{{fromAdjacencyListFile}} method.
The {{fromAdjacencyListFile}} scala method is actually a wrapper of the
corresponding java code.
In the scala test method, I create a temporary file which represents the
Adjacency List formatted text file,like this:
{code:scala}
val adjFileContent = "0-Node0\t1-0.1,4-0.2,5-0.3\n" + "1-Node1\t2-0.3\n" +
"2-Node2 3-0.3\n" + "3-Node3 \n" + "4-Node4\n" + "5-Node5 6-0.7\n" +
"6-Node6 3-0.2\n" +
"7-Node7 4-0.1\n" + "8-Node8 0-0.2\n"
val adjFileSplit = createTempFile(adjFileContent)
{code}
Just for clarification, in the "0-Node0\t1-0.1,4-0.2,5-0.3\n" line of a
Adjacency list formatted text file:
srcvertex-id : 0
srcVertex-value : Node0
neighbours : 1,4,5 , with 0.1,0.2,0.3 being the corresponding edge values for
each edge between the srcVertex and its neighbours.
When I read the file and split each line of the file, in order to create the
graph, I noticed that I can split the srcVertex from its neighbours, when there
is a "\t" character, but not when I have just a whitespace character (" "). I
didn't faced this problem in the java tests.
I use the split method in order to split the lines in the specified delimiters.
{code:java}
line.split("\\s+")
{code}
Any suggestions on how to handle this?
> Add methods to read and write a Graph as adjacency list
> -------------------------------------------------------
>
> Key: FLINK-1815
> URL: https://issues.apache.org/jira/browse/FLINK-1815
> Project: Flink
> Issue Type: New Feature
> Components: Gelly
> Affects Versions: 0.9
> Reporter: Vasia Kalavri
> Assignee: Faye Beligianni
> Priority: Minor
>
> It would be nice to add utility methods to read a graph from an Adjacency
> list format and also write a graph in such a format.
> The simple case would be to read a graph with no vertex or edge values, where
> we would need to define (a) a line delimiter, (b) a delimiter to separate
> vertices from neighbor list and (c) and a delimiter to separate the neighbors.
> For example, "1 2,3,4\n2 1,3" would give vertex 1 with neighbors 2, 3 and 4
> and vertex 2 with neighbors 1 and 3.
> If we have vertex values and/or edge values, we also need to have a way to
> separate IDs from values. For example, we could have "1 0.1 2 0.5, 3 0.2" to
> define a vertex 1 with value 0.1, edge (1, 2) with weight 0.5 and edge (1, 3)
> with weight 0.2.
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