protected byte[] createReturnValueBytecode(
final RuleBuildContext ruleContext, final Map vars, final boolean readLocalsFromTuple) {
final InvokerDataProvider data = new InvokerContext(vars);
final ClassGenerator generator =
createInvokerClassGenerator(data, ruleContext)
.setInterfaces(ReturnValueExpression.class, CompiledInvoker.class);
generator
.addMethod(
ACC_PUBLIC,
"createContext",
generator.methodDescr(Object.class),
new ClassGenerator.MethodBody() {
public void body(MethodVisitor mv) {
mv.visitInsn(ACONST_NULL);
mv.visitInsn(ARETURN);
}
})
.addMethod(
ACC_PUBLIC,
"replaceDeclaration",
generator.methodDescr(null, Declaration.class, Declaration.class))
.addMethod(
ACC_PUBLIC,
"evaluate",
generator.methodDescr(
FieldValue.class,
Object.class,
Tuple.class,
Declaration[].class,
Declaration[].class,
WorkingMemory.class,
Object.class),
new String[] {"java/lang/Exception"},
new EvaluateMethod() {
public void body(MethodVisitor mv) {
final Declaration[] previousDeclarations = (Declaration[]) vars.get("declarations");
final String[] previousDeclarationTypes = (String[]) vars.get("declarationTypes");
final Declaration[] localDeclarations =
(Declaration[]) vars.get("localDeclarations");
final String[] localDeclarationTypes = (String[]) vars.get("localDeclarationTypes");
final String[] globals = (String[]) vars.get("globals");
final String[] globalTypes = (String[]) vars.get("globalTypes");
objAstorePos = 7;
int[] previousDeclarationsParamsPos =
parseDeclarations(
previousDeclarations, previousDeclarationTypes, 3, 2, 5, true);
int[] localDeclarationsParamsPos =
parseDeclarations(
localDeclarations, localDeclarationTypes, 4, 2, 5, readLocalsFromTuple);
// @{ruleClassName}.@{methodName}(@foreach{previousDeclarations},
// @foreach{localDeclarations}, @foreach{globals})
StringBuilder predicateMethodDescr = new StringBuilder("(");
for (int i = 0; i < previousDeclarations.length; i++) {
load(previousDeclarationsParamsPos[i]); // previousDeclarations[i]
predicateMethodDescr.append(typeDescr(previousDeclarationTypes[i]));
}
for (int i = 0; i < localDeclarations.length; i++) {
load(localDeclarationsParamsPos[i]); // localDeclarations[i]
predicateMethodDescr.append(typeDescr(localDeclarationTypes[i]));
}
// @foreach{type : globalTypes, identifier : globals} @{type} @{identifier} = (
// @{type} ) workingMemory.getGlobal( "@{identifier}" );
parseGlobals(globals, globalTypes, 5, predicateMethodDescr);
predicateMethodDescr.append(")Lorg/drools/spi/FieldValue;");
mv.visitMethodInsn(
INVOKESTATIC,
data.getInternalRuleClassName(),
data.getMethodName(),
predicateMethodDescr.toString());
mv.visitInsn(ARETURN);
}
});
return generator.generateBytecode();
}