private static boolean usesGenericsInClassSignature(ClassNode node) {
if (!node.isUsingGenerics()) return false;
if (hasGenerics(node)) return true;
ClassNode sclass = node.getUnresolvedSuperClass(false);
if (sclass.isUsingGenerics()) return true;
ClassNode[] interfaces = node.getInterfaces();
if (interfaces != null) {
for (int i = 0; i < interfaces.length; i++) {
if (interfaces[i].isUsingGenerics()) return true;
}
}
return false;
}
/**
* Interface class nodes retrieved from {@link org.codehaus.groovy.ast.ClassNode#getInterfaces()}
* or {@link org.codehaus.groovy.ast.ClassNode#getAllInterfaces()} are returned with generic type
* arguments. This method allows returning a parameterized interface given the parameterized class
* node which implements this interface.
*
* @param hint the class node where generics types are parameterized
* @param target the interface we want to parameterize generics types
* @return a parameterized interface class node
*/
public static ClassNode parameterizeType(final ClassNode hint, final ClassNode target) {
ClassNode interfaceFromClassNode = null;
if (hint.equals(target)) interfaceFromClassNode = hint;
if (ClassHelper.OBJECT_TYPE.equals(target)
&& target.isUsingGenerics()
&& target.getGenericsTypes() != null
&& target.getGenericsTypes()[0].isPlaceholder()) {
// Object<T>
return ClassHelper.getWrapper(hint);
}
if (interfaceFromClassNode == null) {
ClassNode[] interfaces = hint.getInterfaces();
for (ClassNode node : interfaces) {
if (node.equals(target)) {
interfaceFromClassNode = node;
break;
} else if (node.implementsInterface(target)) {
// ex: classNode = LinkedList<A> , node=List<E> , anInterface = Iterable<T>
return parameterizeType(parameterizeType(hint, node), target);
}
}
}
if (interfaceFromClassNode == null && hint.getUnresolvedSuperClass() != null) {
return parameterizeType(hint.getUnresolvedSuperClass(), target);
}
if (interfaceFromClassNode == null) {
// return target;
interfaceFromClassNode = hint;
}
Map<String, GenericsType> parameters = new HashMap<String, GenericsType>();
extractPlaceholders(hint, parameters);
ClassNode node = target.getPlainNodeReference();
GenericsType[] interfaceGTs = interfaceFromClassNode.getGenericsTypes();
if (interfaceGTs == null) return target;
GenericsType[] types = new GenericsType[interfaceGTs.length];
for (int i = 0; i < interfaceGTs.length; i++) {
GenericsType interfaceGT = interfaceGTs[i];
types[i] = interfaceGT;
if (interfaceGT.isPlaceholder()) {
String name = interfaceGT.getName();
if (parameters.containsKey(name)) {
types[i] = parameters.get(name);
}
}
}
node.setGenericsTypes(types);
return node;
}
/**
* @param name is the full name of the class
* @param modifiers the modifiers,
* @param superClass the base class name - use "java.lang.Object" if no direct base class
* @param interfaces the interfaces for this class
* @param mixins the mixins for this class
* @see org.objectweb.asm.Opcodes
*/
public ClassNode(
String name,
int modifiers,
ClassNode superClass,
ClassNode[] interfaces,
MixinNode[] mixins) {
this.name = name;
this.modifiers = modifiers;
this.superClass = superClass;
this.interfaces = interfaces;
this.mixins = mixins;
isPrimaryNode = true;
if (superClass != null) {
usesGenerics = superClass.isUsingGenerics();
}
if (!usesGenerics && interfaces != null) {
for (ClassNode anInterface : interfaces) {
usesGenerics = usesGenerics || anInterface.isUsingGenerics();
if (usesGenerics) break;
}
}
this.methods = new MapOfLists();
this.methodsList = Collections.emptyList();
}
public static ClassNode nonGeneric(ClassNode type) {
if (type.isUsingGenerics()) {
final ClassNode nonGen = ClassHelper.makeWithoutCaching(type.getName());
nonGen.setRedirect(type);
nonGen.setGenericsTypes(null);
nonGen.setUsingGenerics(false);
return nonGen;
}
if (type.isArray()) {
final ClassNode nonGen = ClassHelper.makeWithoutCaching(Object.class);
nonGen.setUsingGenerics(false);
return nonGen.makeArray();
}
return type.getPlainNodeReference();
}
private void checkGenericsUsage(ASTNode ref, ClassNode node) {
if (node.isArray()) {
checkGenericsUsage(ref, node.getComponentType());
} else if (!node.isRedirectNode() && node.isUsingGenerics()) {
addError(
"A transform used a generics containing ClassNode "
+ node
+ " "
+ "for "
+ getRefDescriptor(ref)
+ "directly. You are not suppposed to do this. "
+ "Please create a new ClassNode refering to the old ClassNode "
+ "and use the new ClassNode instead of the old one. Otherwise "
+ "the compiler will create wrong descriptors and a potential "
+ "NullPointerException in TypeResolver in the OpenJDK. If this is "
+ "not your own doing, please report this bug to the writer of the "
+ "transform.",
ref);
}
}
/**
* For a given classnode, fills in the supplied map with the parameterized types it defines.
*
* @param node
* @param map
*/
public static void extractPlaceholders(ClassNode node, Map<String, GenericsType> map) {
if (node == null) return;
if (node.isArray()) {
extractPlaceholders(node.getComponentType(), map);
return;
}
if (!node.isUsingGenerics() || !node.isRedirectNode()) return;
GenericsType[] parameterized = node.getGenericsTypes();
if (parameterized == null || parameterized.length == 0) return;
GenericsType[] redirectGenericsTypes = node.redirect().getGenericsTypes();
if (redirectGenericsTypes == null) redirectGenericsTypes = parameterized;
for (int i = 0; i < redirectGenericsTypes.length; i++) {
GenericsType redirectType = redirectGenericsTypes[i];
if (redirectType.isPlaceholder()) {
String name = redirectType.getName();
if (!map.containsKey(name)) map.put(name, parameterized[i]);
}
}
}
public ClassNode parameterizedType(ClassNode baseType, ClassNode... genericsTypeArguments) {
ClassNode result = baseType.getPlainNodeReference();
if (result.isUsingGenerics()) {
GenericsType[] gts = new GenericsType[genericsTypeArguments.length];
int expectedLength = result.getGenericsTypes().length;
if (expectedLength != genericsTypeArguments.length) {
throw new GroovyBugError(
"Expected number of generic type arguments for "
+ baseType.toString(false)
+ " is "
+ expectedLength
+ " but you gave "
+ genericsTypeArguments.length);
}
for (int i = 0; i < gts.length; i++) {
gts[i] = new GenericsType(genericsTypeArguments[i]);
}
result.setGenericsTypes(gts);
}
return result;
}
protected ClassNode createClosureClass(ClosureExpression expression, int mods) {
ClassNode classNode = controller.getClassNode();
ClassNode outerClass = controller.getOutermostClass();
MethodNode methodNode = controller.getMethodNode();
String name =
classNode.getName()
+ "$"
+ controller
.getContext()
.getNextClosureInnerName(
outerClass, classNode, methodNode); // add a more informative name
boolean staticMethodOrInStaticClass = controller.isStaticMethod() || classNode.isStaticClass();
Parameter[] parameters = expression.getParameters();
if (parameters == null) {
parameters = Parameter.EMPTY_ARRAY;
} else if (parameters.length == 0) {
// let's create a default 'it' parameter
Parameter it = new Parameter(ClassHelper.OBJECT_TYPE, "it", ConstantExpression.NULL);
parameters = new Parameter[] {it};
Variable ref = expression.getVariableScope().getDeclaredVariable("it");
if (ref != null) it.setClosureSharedVariable(ref.isClosureSharedVariable());
}
Parameter[] localVariableParams = getClosureSharedVariables(expression);
removeInitialValues(localVariableParams);
InnerClassNode answer =
new InnerClassNode(classNode, name, mods, ClassHelper.CLOSURE_TYPE.getPlainNodeReference());
answer.setEnclosingMethod(controller.getMethodNode());
answer.setSynthetic(true);
answer.setUsingGenerics(outerClass.isUsingGenerics());
answer.setSourcePosition(expression);
if (staticMethodOrInStaticClass) {
answer.setStaticClass(true);
}
if (controller.isInScriptBody()) {
answer.setScriptBody(true);
}
MethodNode method =
answer.addMethod(
"doCall",
ACC_PUBLIC,
ClassHelper.OBJECT_TYPE,
parameters,
ClassNode.EMPTY_ARRAY,
expression.getCode());
method.setSourcePosition(expression);
VariableScope varScope = expression.getVariableScope();
if (varScope == null) {
throw new RuntimeException(
"Must have a VariableScope by now! for expression: " + expression + " class: " + name);
} else {
method.setVariableScope(varScope.copy());
}
if (parameters.length > 1
|| (parameters.length == 1
&& parameters[0].getType() != null
&& parameters[0].getType() != ClassHelper.OBJECT_TYPE
&& !ClassHelper.OBJECT_TYPE.equals(parameters[0].getType().getComponentType()))) {
// let's add a typesafe call method
MethodNode call =
answer.addMethod(
"call",
ACC_PUBLIC,
ClassHelper.OBJECT_TYPE,
parameters,
ClassNode.EMPTY_ARRAY,
new ReturnStatement(
new MethodCallExpression(
VariableExpression.THIS_EXPRESSION,
"doCall",
new ArgumentListExpression(parameters))));
call.setSourcePosition(expression);
}
// let's make the constructor
BlockStatement block = new BlockStatement();
// this block does not get a source position, because we don't
// want this synthetic constructor to show up in corbertura reports
VariableExpression outer = new VariableExpression("_outerInstance");
outer.setSourcePosition(expression);
block.getVariableScope().putReferencedLocalVariable(outer);
VariableExpression thisObject = new VariableExpression("_thisObject");
thisObject.setSourcePosition(expression);
block.getVariableScope().putReferencedLocalVariable(thisObject);
TupleExpression conArgs = new TupleExpression(outer, thisObject);
block.addStatement(
new ExpressionStatement(new ConstructorCallExpression(ClassNode.SUPER, conArgs)));
// let's assign all the parameter fields from the outer context
for (Parameter param : localVariableParams) {
String paramName = param.getName();
ClassNode type = param.getType();
if (true) {
VariableExpression initialValue = new VariableExpression(paramName);
initialValue.setAccessedVariable(param);
initialValue.setUseReferenceDirectly(true);
ClassNode realType = type;
type = ClassHelper.makeReference();
param.setType(ClassHelper.makeReference());
FieldNode paramField =
answer.addField(paramName, ACC_PRIVATE | ACC_SYNTHETIC, type, initialValue);
paramField.setOriginType(ClassHelper.getWrapper(param.getOriginType()));
paramField.setHolder(true);
String methodName = Verifier.capitalize(paramName);
// let's add a getter & setter
Expression fieldExp = new FieldExpression(paramField);
answer.addMethod(
"get" + methodName,
ACC_PUBLIC,
realType.getPlainNodeReference(),
Parameter.EMPTY_ARRAY,
ClassNode.EMPTY_ARRAY,
new ReturnStatement(fieldExp));
}
}
Parameter[] params = new Parameter[2 + localVariableParams.length];
params[0] = new Parameter(ClassHelper.OBJECT_TYPE, "_outerInstance");
params[1] = new Parameter(ClassHelper.OBJECT_TYPE, "_thisObject");
System.arraycopy(localVariableParams, 0, params, 2, localVariableParams.length);
ASTNode sn = answer.addConstructor(ACC_PUBLIC, params, ClassNode.EMPTY_ARRAY, block);
sn.setSourcePosition(expression);
correctAccessedVariable(answer, expression);
return answer;
}