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Difference between revisions of "VIATRA/Query/UserDocumentation/PureWhitelist"

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Revision as of 12:08, 26 February 2016

By default, check()/eval() constraints do not support calling arbitrary Java methods, since they are generally assumed to be impure. However, if you have a pure method and want to call it in these types of constraints, you have two options:

  • if it is implemented by you, annotate it with the @Pure annotation of Xbase (org.eclipse.xtext.xbase.lib.Pure)
  • if it comes from a third-party library, register it via the org.eclipse.incquery.patternlanguage.purewhitelist extension point

Some standard library methods are marked as pure by default, including:

  • java.lang.Math
  • java.lang.String

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