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https://issues.apache.org/jira/browse/FLINK-1815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15541994#comment-15541994
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Faye Beligianni commented on FLINK-1815:
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Hey,
I am not sure why I wasn't aware of the {{FieldParser}}'s functionality, that
would have save me a lot of time since I wouldn't have to use the
{{GraphAdjacencyListReader.fromString()}} and test again and again the parsing
functionality :/ . I am sorry for that, but of course I can/will change that.
Regarding the string splits and concatenations, since I read the file with the
{{readTextFile}} method, I used java's {{String.split}} method for the splits.
I split each line with respect to the delimiters separating: the source from
the neighbours, the vertex ids from the vertex/edge values e.t.c. . Again,
please tell me if there is a better way to perform the splits of a text line.
If though you believe that this read/write a Graph as adjacency list issue
should be approached in a much different way, than the one I implemented, of
course I have no problem to reassign the ticket, or reject the PR and discuss
further the implementation of this issue.
> 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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