CodeQL library for Java
codeql/java-all 0.3.3 (changelog, source)
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Predicate basicOrCustomNullGuard

Gets an expression that directly tests whether a given expression, e, is null or not.

If result evaluates to branch, then e is guaranteed to be null if isnull is true, and non-null if isnull is false.

Import path

import semmle.code.java.dataflow.NullGuards
Expr basicOrCustomNullGuard(Expr e, boolean branch, boolean isnull)