private static void printDebug(String msg, MemberBox member, Object[] args) {
if (debug) {
StringBuffer sb = new StringBuffer();
sb.append(" ----- ");
sb.append(msg);
sb.append(member.getDeclaringClass().getName());
sb.append('.');
if (member.isMethod()) {
sb.append(member.getName());
}
sb.append(JavaMembers.liveConnectSignature(member.argTypes));
sb.append(" for arguments (");
sb.append(scriptSignature(args));
sb.append(')');
System.out.println(sb);
}
}
/**
* Find the index of the correct function to call given the set of methods or constructors and the
* arguments. If no function can be found to call, return -1.
*/
static int findFunction(Context cx, MemberBox[] methodsOrCtors, Object[] args) {
if (methodsOrCtors.length == 0) {
return -1;
} else if (methodsOrCtors.length == 1) {
MemberBox member = methodsOrCtors[0];
Class<?>[] argTypes = member.argTypes;
int alength = argTypes.length;
if (member.vararg) {
alength--;
if (alength > args.length) {
return -1;
}
} else {
if (alength != args.length) {
return -1;
}
}
for (int j = 0; j != alength; ++j) {
if (!NativeJavaObject.canConvert(args[j], argTypes[j])) {
if (debug) printDebug("Rejecting (args can't convert) ", member, args);
return -1;
}
}
if (debug) printDebug("Found ", member, args);
return 0;
}
int firstBestFit = -1;
int[] extraBestFits = null;
int extraBestFitsCount = 0;
search:
for (int i = 0; i < methodsOrCtors.length; i++) {
MemberBox member = methodsOrCtors[i];
Class<?>[] argTypes = member.argTypes;
int alength = argTypes.length;
if (member.vararg) {
alength--;
if (alength > args.length) {
continue search;
}
} else {
if (alength != args.length) {
continue search;
}
}
for (int j = 0; j < alength; j++) {
if (!NativeJavaObject.canConvert(args[j], argTypes[j])) {
if (debug) printDebug("Rejecting (args can't convert) ", member, args);
continue search;
}
}
if (firstBestFit < 0) {
if (debug) printDebug("Found first applicable ", member, args);
firstBestFit = i;
} else {
// Compare with all currently fit methods.
// The loop starts from -1 denoting firstBestFit and proceed
// until extraBestFitsCount to avoid extraBestFits allocation
// in the most common case of no ambiguity
int betterCount = 0; // number of times member was prefered over
// best fits
int worseCount = 0; // number of times best fits were prefered
// over member
for (int j = -1; j != extraBestFitsCount; ++j) {
int bestFitIndex;
if (j == -1) {
bestFitIndex = firstBestFit;
} else {
bestFitIndex = extraBestFits[j];
}
MemberBox bestFit = methodsOrCtors[bestFitIndex];
if (cx.hasFeature(Context.FEATURE_ENHANCED_JAVA_ACCESS)
&& (bestFit.member().getModifiers() & Modifier.PUBLIC)
!= (member.member().getModifiers() & Modifier.PUBLIC)) {
// When FEATURE_ENHANCED_JAVA_ACCESS gives us access
// to non-public members, continue to prefer public
// methods in overloading
if ((bestFit.member().getModifiers() & Modifier.PUBLIC) == 0) ++betterCount;
else ++worseCount;
} else {
int preference =
preferSignature(args, argTypes, member.vararg, bestFit.argTypes, bestFit.vararg);
if (preference == PREFERENCE_AMBIGUOUS) {
break;
} else if (preference == PREFERENCE_FIRST_ARG) {
++betterCount;
} else if (preference == PREFERENCE_SECOND_ARG) {
++worseCount;
} else {
if (preference != PREFERENCE_EQUAL) Kit.codeBug();
// This should not happen in theory
// but on some JVMs, Class.getMethods will return all
// static methods of the class hierarchy, even if
// a derived class's parameters match exactly.
// We want to call the derived class's method.
if (bestFit.isStatic()
&& bestFit.getDeclaringClass().isAssignableFrom(member.getDeclaringClass())) {
// On some JVMs, Class.getMethods will return all
// static methods of the class hierarchy, even if
// a derived class's parameters match exactly.
// We want to call the derived class's method.
if (debug) printDebug("Substituting (overridden static)", member, args);
if (j == -1) {
firstBestFit = i;
} else {
extraBestFits[j] = i;
}
} else {
if (debug) printDebug("Ignoring same signature member ", member, args);
}
continue search;
}
}
}
if (betterCount == 1 + extraBestFitsCount) {
// member was prefered over all best fits
if (debug) printDebug("New first applicable ", member, args);
firstBestFit = i;
extraBestFitsCount = 0;
} else if (worseCount == 1 + extraBestFitsCount) {
// all best fits were prefered over member, ignore it
if (debug) printDebug("Rejecting (all current bests better) ", member, args);
} else {
// some ambiguity was present, add member to best fit set
if (debug) printDebug("Added to best fit set ", member, args);
if (extraBestFits == null) {
// Allocate maximum possible array
extraBestFits = new int[methodsOrCtors.length - 1];
}
extraBestFits[extraBestFitsCount] = i;
++extraBestFitsCount;
}
}
}
if (firstBestFit < 0) {
// Nothing was found
return -1;
} else if (extraBestFitsCount == 0) {
// single best fit
return firstBestFit;
}
// report remaining ambiguity
StringBuffer buf = new StringBuffer();
for (int j = -1; j != extraBestFitsCount; ++j) {
int bestFitIndex;
if (j == -1) {
bestFitIndex = firstBestFit;
} else {
bestFitIndex = extraBestFits[j];
}
buf.append("\n ");
buf.append(methodsOrCtors[bestFitIndex].toJavaDeclaration());
}
MemberBox firstFitMember = methodsOrCtors[firstBestFit];
String memberName = firstFitMember.getName();
String memberClass = firstFitMember.getDeclaringClass().getName();
if (methodsOrCtors[0].isMethod()) {
throw Context.reportRuntimeError3(
"msg.constructor.ambiguous", memberName, scriptSignature(args), buf.toString());
} else {
throw Context.reportRuntimeError4(
"msg.method.ambiguous", memberClass, memberName, scriptSignature(args), buf.toString());
}
}
@Override
public Object call(Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
// Find a method that matches the types given.
if (methods.length == 0) {
throw new RuntimeException("No methods defined for call");
}
int index = findFunction(cx, methods, args);
if (index < 0) {
Class<?> c = methods[0].method().getDeclaringClass();
String sig = c.getName() + '.' + getFunctionName() + '(' + scriptSignature(args) + ')';
throw Context.reportRuntimeError1("msg.java.no_such_method", sig);
}
MemberBox meth = methods[index];
Class<?>[] argTypes = meth.argTypes;
if (meth.vararg) {
// marshall the explicit parameters
Object[] newArgs = new Object[argTypes.length];
for (int i = 0; i < argTypes.length - 1; i++) {
newArgs[i] = Context.jsToJava(args[i], argTypes[i]);
}
Object varArgs;
// Handle special situation where a single variable parameter
// is given and it is a Java or ECMA array or is null.
if (args.length == argTypes.length
&& (args[args.length - 1] == null
|| args[args.length - 1] instanceof NativeArray
|| args[args.length - 1] instanceof NativeJavaArray)) {
// convert the ECMA array into a native array
varArgs = Context.jsToJava(args[args.length - 1], argTypes[argTypes.length - 1]);
} else {
// marshall the variable parameters
Class<?> componentType = argTypes[argTypes.length - 1].getComponentType();
varArgs = Array.newInstance(componentType, args.length - argTypes.length + 1);
for (int i = 0; i < Array.getLength(varArgs); i++) {
Object value = Context.jsToJava(args[argTypes.length - 1 + i], componentType);
Array.set(varArgs, i, value);
}
}
// add varargs
newArgs[argTypes.length - 1] = varArgs;
// replace the original args with the new one
args = newArgs;
} else {
// First, we marshall the args.
Object[] origArgs = args;
for (int i = 0; i < args.length; i++) {
Object arg = args[i];
Object coerced = Context.jsToJava(arg, argTypes[i]);
if (coerced != arg) {
if (origArgs == args) {
args = args.clone();
}
args[i] = coerced;
}
}
}
Object javaObject;
if (meth.isStatic()) {
javaObject = null; // don't need an object
} else {
Scriptable o = thisObj;
Class<?> c = meth.getDeclaringClass();
for (; ; ) {
if (o == null) {
throw Context.reportRuntimeError3(
"msg.nonjava.method",
getFunctionName(),
ScriptRuntime.toString(thisObj),
c.getName());
}
if (o instanceof Wrapper) {
javaObject = ((Wrapper) o).unwrap();
if (c.isInstance(javaObject)) {
break;
}
}
o = o.getPrototype();
}
}
if (debug) {
printDebug("Calling ", meth, args);
}
Object retval = meth.invoke(javaObject, args);
Class<?> staticType = meth.method().getReturnType();
if (debug) {
Class<?> actualType = (retval == null) ? null : retval.getClass();
System.err.println(
" ----- Returned " + retval + " actual = " + actualType + " expect = " + staticType);
}
Object wrapped =
cx.getWrapFactory()
.wrap(
cx, scope,
retval, staticType);
if (debug) {
Class<?> actualType = (wrapped == null) ? null : wrapped.getClass();
System.err.println(" ----- Wrapped as " + wrapped + " class = " + actualType);
}
if (wrapped == null && staticType == Void.TYPE) {
wrapped = Undefined.instance;
}
return wrapped;
}