28.4 Connecting Scheme and Java code

When compiling and linking with the JVM back-end, Bigloo source code may use the Java API. That is, Bigloo Scheme source code may use (refer or set) Java static variables, Bigloo source code may call static or virtual Java methods. In addition, Bigloo variables and functions may be exported to Java, that is use, set or called in Java source code. Java module clauses are enabled (read and parsed) only when compiling to JVM byte code.

Java definitions are declared in Bigloo modules by the mean of a Bigloo module clause: the java module clause. The syntax of a Java clause is defined by:

<java> → <declare-class-clause>
     | <declare-abstract-class-clause>
     | <extend-class-clause>
     | <array-clause>
     | <export-clause>

As for the extern clause, java clauses are automatically “transmitted” by the importation process. That is, if module module1 imports a module module2, module treats the java clauses of module2 as though they were included in its own module declaration. Redefinition of a variable or a function already defined in an java clause is an error. However, the definition of a Java class or an Java abstract class may be enriched from module to module.

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