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;
}
private JCTree makeDefaultedCall(
int i, boolean isVariadic, java.util.List<ProducedType> parameterTypes) {
// collect every parameter
int a = 0;
ListBuffer<JCStatement> stmts = new ListBuffer<JCStatement>();
for (Parameter param : paramLists.getParameters()) {
// don't read default parameter values for forwarded calls
if (forwardCallTo != null && i == a) break;
// read the value
JCExpression paramExpression = getTypedParameter(param, a, i > 3, parameterTypes);
JCExpression varInitialExpression;
if (param.isDefaulted() || param.isSequenced()) {
if (i > 3) {
// must check if it's defined
JCExpression test =
gen.make()
.Binary(JCTree.GT, gen.makeSelect(getParamName(0), "length"), gen.makeInteger(a));
JCExpression elseBranch = makeDefaultValueCall(param, a);
varInitialExpression = gen.make().Conditional(test, paramExpression, elseBranch);
} else if (a >= i) {
// get its default value because we don't have it
varInitialExpression = makeDefaultValueCall(param, a);
} else {
// we must have it
varInitialExpression = paramExpression;
}
} else {
varInitialExpression = paramExpression;
}
// store it in a local var
JCStatement var =
gen.make()
.VarDef(
gen.make().Modifiers(Flags.FINAL),
gen.naming.makeUnquotedName(getCallableTempVarName(param)),
gen.makeJavaType(
parameterTypes.get(a),
CodegenUtil.isUnBoxed(param) ? 0 : gen.JT_NO_PRIMITIVES),
varInitialExpression);
stmts.append(var);
a++;
}
if (forwardCallTo != null) {
InvocationBuilder invocationBuilder =
InvocationBuilder.forCallableInvocation(gen, forwardCallTo, paramLists, i);
boolean prevCallableInv = gen.expressionGen().withinCallableInvocation(true);
try {
stmts.append(gen.make().Return(invocationBuilder.build()));
} finally {
gen.expressionGen().withinCallableInvocation(prevCallableInv);
}
} else if (isVariadic) {
// chain to n param typed method
List<JCExpression> args = List.nil();
// pass along the parameters
for (a = paramLists.getParameters().size() - 1; a >= 0; a--) {
Parameter param = paramLists.getParameters().get(a);
args = args.prepend(gen.makeUnquotedIdent(getCallableTempVarName(param)));
}
JCMethodInvocation chain =
gen.make().Apply(null, gen.makeUnquotedIdent(Naming.getCallableTypedMethodName()), args);
stmts.append(gen.make().Return(chain));
} else {
// insert the method body directly
stmts.appendList(this.body);
}
List<JCStatement> body = stmts.toList();
return makeCallMethod(body, i);
}