private JCTree makeCallMethod(List<JCStatement> body, int numParams) {
MethodDefinitionBuilder callMethod = MethodDefinitionBuilder.callable(gen);
callMethod.isOverride(true);
callMethod.modifiers(Flags.PUBLIC);
ProducedType returnType = gen.getReturnTypeOfCallable(typeModel);
callMethod.resultType(gen.makeJavaType(returnType, JT_NO_PRIMITIVES), null);
// Now append formal parameters
switch (numParams) {
case 3:
callMethod.parameter(makeCallableCallParam(0, numParams - 3));
// fall through
case 2:
callMethod.parameter(makeCallableCallParam(0, numParams - 2));
// fall through
case 1:
callMethod.parameter(makeCallableCallParam(0, numParams - 1));
break;
case 0:
break;
default: // use varargs
callMethod.parameter(makeCallableCallParam(Flags.VARARGS, 0));
}
// Return the call result, or null if a void method
callMethod.body(body);
return callMethod.build();
}
public JCNewClass build() {
// Generate a subclass of Callable
ListBuffer<JCTree> classBody = new ListBuffer<JCTree>();
int numParams = paramLists.getParameters().size();
int minimumParams = 0;
for (Parameter p : paramLists.getParameters()) {
if (p.isDefaulted() || p.isSequenced()) break;
minimumParams++;
}
boolean isVariadic = minimumParams != numParams;
if (parameterListTree != null) {
// generate a method for each defaulted param
for (Tree.Parameter p : parameterListTree.getParameters()) {
if (p.getDefaultArgument() != null || p.getDeclarationModel().isSequenced()) {
MethodDefinitionBuilder methodBuilder =
gen.classGen().makeParamDefaultValueMethod(false, null, parameterListTree, p);
classBody.append(methodBuilder.build());
}
}
}
// collect each parameter type from the callable type model rather than the declarations to get
// them all bound
java.util.List<ProducedType> parameterTypes = new ArrayList<ProducedType>(numParams);
if (forwardCallTo != null) {
for (int i = 0; i < numParams; i++)
parameterTypes.add(gen.getParameterTypeOfCallable(typeModel, i));
} else {
// get them from our declaration
for (Parameter p : paramLists.getParameters()) parameterTypes.add(p.getType());
}
// now generate a method for each supported minimum number of parameters below 4
// which delegates to the $call$typed method if required
for (int i = minimumParams, max = Math.min(numParams, 4); i < max; i++) {
classBody.append(makeDefaultedCall(i, isVariadic, parameterTypes));
}
// generate the $call method for the max number of parameters,
// which delegates to the $call$typed method if required
classBody.append(makeDefaultedCall(numParams, isVariadic, parameterTypes));
// generate the $call$typed method if required
if (isVariadic && forwardCallTo == null)
classBody.append(makeCallTypedMethod(body, parameterTypes));
JCClassDecl classDef =
gen.make().AnonymousClassDef(gen.make().Modifiers(0), classBody.toList());
JCNewClass instance =
gen.make()
.NewClass(
null,
null,
gen.makeJavaType(typeModel, JT_EXTENDS | JT_CLASS_NEW),
List.<JCExpression>of(gen.make().Literal(typeModel.getProducedTypeName(true))),
classDef);
return instance;
}
/**
* Appends to <tt>defs</tt> the definitions that would go into the class generated by {@link
* #build()}
*
* @param defs a {@link ListBuffer} to which the definitions will be appended.
*/
public void appendDefinitionsTo(ListBuffer<JCTree> defs) {
if (hasField) {
defs.append(generateField());
if (variableInit != null) defs.append(generateFieldInit());
}
if (readable) {
getterBuilder.modifiers(getGetSetModifiers());
getterBuilder.noAnnotations(noAnnotations);
defs.append(getterBuilder.build());
}
if (writable) {
setterBuilder.modifiers(getGetSetModifiers());
setterBuilder.noAnnotations(noAnnotations);
defs.append(setterBuilder.build());
}
}
private JCTree makeCallTypedMethod(
List<JCStatement> body, java.util.List<ProducedType> parameterTypes) {
// make the method
MethodDefinitionBuilder methodBuilder =
MethodDefinitionBuilder.method(gen, false, Naming.getCallableTypedMethodName());
methodBuilder.modifiers(Flags.PRIVATE);
ProducedType returnType = gen.getReturnTypeOfCallable(typeModel);
methodBuilder.resultType(gen.makeJavaType(returnType, JT_NO_PRIMITIVES), null);
// add all parameters
int i = 0;
for (Parameter param : paramLists.getParameters()) {
ParameterDefinitionBuilder parameterBuilder =
ParameterDefinitionBuilder.instance(gen, param.getName());
JCExpression paramType = gen.makeJavaType(parameterTypes.get(i));
parameterBuilder.type(paramType, null);
methodBuilder.parameter(parameterBuilder);
i++;
}
// Return the call result, or null if a void method
methodBuilder.body(body);
return methodBuilder.build();
}
