Null pointer exception when changing value of boolean[] column

[eduramiba]

Way to reproduce:

• Add a boolean array column
• Set a value for a row
• Set a different value for the same row

This seems to only happen to boolean arrays, and not to other types of arrays.

java.lang.NullPointerException
    at org.gephi.graph.impl.IndexImpl$AbstractIndex.removeValue(IndexImpl.java:434)
    at org.gephi.graph.impl.IndexImpl$BooleanArrayIndex.removeValue(IndexImpl.java:951)
    at org.gephi.graph.impl.IndexImpl$AbstractIndex.replaceValue(IndexImpl.java:444)
    at org.gephi.graph.impl.IndexImpl.set(IndexImpl.java:209)
    at org.gephi.graph.impl.IndexStore.set(IndexStore.java:111)
    at org.gephi.graph.impl.ElementImpl.setAttribute(ElementImpl.java:359)

[eduramiba]

Actually not that easy to reproduce (seems to only happen when there is only one node in the graph and the first value has at least 2 elements).

It can be reproduced often in Gephi with these steps:

• Create a new workspace
• Add a single node
• Add boolean array column
• Set a value like [true, false]
• Set another value like [true, true, false]

[mbastian]

Good catch. In fact the error is due to the fact arrays contain duplicate values... This wasn't really developed with great care as I didn't test this case. I was doubtful the way we index array actually make sense and this is a good trigger to change it. More in #126.