/**
* For each member with the given name, find the most derived members for each JSNI reference that
* match it. For wildcard JSNI references, there will in general be more than one match. This
* method does not ignore synthetic methods.
*/
private static void findMostDerivedMembers(
LinkedHashMap<String, LinkedHashMap<String, HasEnclosingType>> matchesBySig,
JDeclaredType targetType,
String memberName,
boolean addConstructors) {
/*
* Analyze superclasses and interfaces first. More derived members will thus
* be seen later.
*/
if (targetType instanceof JClassType) {
JClassType targetClass = (JClassType) targetType;
if (targetClass.getSuperClass() != null) {
findMostDerivedMembers(matchesBySig, targetClass.getSuperClass(), memberName, false);
}
}
for (JDeclaredType intf : targetType.getImplements()) {
findMostDerivedMembers(matchesBySig, intf, memberName, false);
}
// Get the methods on this class/interface.
for (JMethod method : targetType.getMethods()) {
if (method.getName().equals(memberName)) {
if (addConstructors || !method.getName().equals(JsniRef.NEW)) {
addMember(matchesBySig, method, getJsniSignature(method, false));
addMember(matchesBySig, method, getJsniSignature(method, true));
}
}
}
// Get the fields on this class/interface.
for (JField field : targetType.getFields()) {
if (field.getName().equals(memberName)) {
addMember(matchesBySig, field, field.getName());
}
}
}
/** Constructed by {@link MemberFactory#get(JFieldType)}. */
public StandardFieldMember(MemberFactory factory, JField field) {
this.enclosing = factory.get(field.getEnclosingType());
this.sourceName = field.getEnclosingType().getName() + "::" + field.getName();
}
/**
* Look up a JSNI reference.
*
* @param ref The reference to look up
* @param program The program to look up the reference in
* @param errorReporter A callback used to indicate the reason for a failed JSNI lookup
* @return The item referred to, or <code>null</code> if it could not be found. If the return
* value is <code>null</code>, <code>errorReporter</code> will have been invoked.
*/
public static HasEnclosingType findJsniRefTarget(
JsniRef ref, JProgram program, JsniRefLookup.ErrorReporter errorReporter) {
String className = ref.className();
JType type = null;
if (!className.equals("null")) {
type = program.getTypeFromJsniRef(className);
if (type == null) {
errorReporter.reportError("Unresolvable native reference to type '" + className + "'");
return null;
}
}
if (!ref.isMethod()) {
// look for a field
String fieldName = ref.memberName();
if (type == null) {
if (fieldName.equals("nullField")) {
return program.getNullField();
}
} else if (fieldName.equals(JsniRef.CLASS)) {
JClassLiteral lit = program.getLiteralClass(type);
return lit.getField();
} else if (type instanceof JPrimitiveType) {
errorReporter.reportError("May not refer to fields on primitive types");
return null;
} else if (type instanceof JArrayType) {
errorReporter.reportError("May not refer to fields on array types");
return null;
} else {
for (JField field : ((JDeclaredType) type).getFields()) {
if (field.getName().equals(fieldName)) {
return field;
}
}
}
errorReporter.reportError(
"Unresolvable native reference to field '" + fieldName + "' in type '" + className + "'");
return null;
} else if (type instanceof JPrimitiveType) {
errorReporter.reportError("May not refer to methods on primitive types");
return null;
} else {
// look for a method
LinkedHashMap<String, LinkedHashMap<String, HasEnclosingType>> matchesBySig =
new LinkedHashMap<String, LinkedHashMap<String, HasEnclosingType>>();
String methodName = ref.memberName();
String jsniSig = ref.memberSignature();
if (type == null) {
if (jsniSig.equals("nullMethod()")) {
return program.getNullMethod();
}
} else {
findMostDerivedMembers(matchesBySig, (JDeclaredType) type, ref.memberName(), true);
LinkedHashMap<String, HasEnclosingType> matches = matchesBySig.get(jsniSig);
if (matches != null && matches.size() == 1) {
/*
* Backward compatibility: allow accessing bridge methods with full
* qualification
*/
return matches.values().iterator().next();
}
removeSyntheticMembers(matchesBySig);
matches = matchesBySig.get(jsniSig);
if (matches != null && matches.size() == 1) {
return matches.values().iterator().next();
}
}
// Not found; signal an error
if (matchesBySig.isEmpty()) {
errorReporter.reportError(
"Unresolvable native reference to method '"
+ methodName
+ "' in type '"
+ className
+ "'");
return null;
} else {
StringBuilder suggestList = new StringBuilder();
String comma = "";
// use a TreeSet to sort the near matches
TreeSet<String> almostMatchSigs = new TreeSet<String>();
for (String sig : matchesBySig.keySet()) {
if (matchesBySig.get(sig).size() == 1) {
almostMatchSigs.add(sig);
}
}
for (String almost : almostMatchSigs) {
suggestList.append(comma + "'" + almost + "'");
comma = ", ";
}
errorReporter.reportError(
"Unresolvable native reference to method '"
+ methodName
+ "' in type '"
+ className
+ "' (did you mean "
+ suggestList.toString()
+ "?)");
return null;
}
}
}