本文整理汇总了Java中java.lang.invoke.MethodType.parameterType方法的典型用法代码示例。如果您正苦于以下问题:Java MethodType.parameterType方法的具体用法?Java MethodType.parameterType怎么用?Java MethodType.parameterType使用的例子?那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类java.lang.invoke.MethodType
的用法示例。
在下文中一共展示了MethodType.parameterType方法的15个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: PIC
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
PIC(Lookup lookup, String name, MethodType type, int initialDepth, int flavor, Object[] args) {
super(type);
if (type.parameterType(0) != Object.class) {
throw new BootstrapMethodError("The receiver type (1st arg) of invokedynamic descriptor must be Object.");
}
this.lookup = lookup;
this.name = name;
this.flavor = flavor;
this.args = args;
this.depth = initialDepth;
MethodHandle fallback = FALLBACK.bindTo(this)
.asCollector(Object[].class, type.parameterCount())
.asType(type);
setTarget(fallback);
}
示例2: findFastSetIndexMethod
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
/**
* Return a fast linked array setter, or null if we have to dispatch to super class
* @param desc descriptor
* @param request link request
* @return invocation or null if needs to be sent to slow relink
*/
@Override
public GuardedInvocation findFastSetIndexMethod(final Class<? extends ArrayData> clazz, final CallSiteDescriptor desc, final LinkRequest request) { // array, index, value
final MethodType callType = desc.getMethodType();
final Class<?> indexType = callType.parameterType(1);
final Class<?> elementType = callType.parameterType(2);
if (ContinuousArrayData.class.isAssignableFrom(clazz) && indexType == int.class) {
final Object[] args = request.getArguments();
final int index = (int)args[args.length - 2];
if (hasRoomFor(index)) {
MethodHandle setElement = getElementSetter(elementType); //Z(continuousarraydata, int, int), return true if successful
if (setElement != null) {
//else we are dealing with a wider type than supported by this callsite
MethodHandle getArray = ScriptObject.GET_ARRAY.methodHandle();
getArray = MH.asType(getArray, getArray.type().changeReturnType(getClass()));
setElement = MH.filterArguments(setElement, 0, getArray);
final MethodHandle guard = MH.insertArguments(FAST_ACCESS_GUARD, 0, clazz);
return new GuardedInvocation(setElement, guard, (SwitchPoint)null, ClassCastException.class); //CCE if not a scriptObject anymore
}
}
}
return null;
}
示例3: findFastGetIndexMethod
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
/**
* Return a fast linked array getter, or null if we have to dispatch to super class
* @param desc descriptor
* @param request link request
* @return invocation or null if needs to be sent to slow relink
*/
@Override
public GuardedInvocation findFastGetIndexMethod(final Class<? extends ArrayData> clazz, final CallSiteDescriptor desc, final LinkRequest request) {
final MethodType callType = desc.getMethodType();
final Class<?> indexType = callType.parameterType(1);
final Class<?> returnType = callType.returnType();
if (ContinuousArrayData.class.isAssignableFrom(clazz) && indexType == int.class) {
final Object[] args = request.getArguments();
final int index = (int)args[args.length - 1];
if (has(index)) {
final MethodHandle getArray = ScriptObject.GET_ARRAY.methodHandle();
final int programPoint = NashornCallSiteDescriptor.isOptimistic(desc) ? NashornCallSiteDescriptor.getProgramPoint(desc) : INVALID_PROGRAM_POINT;
MethodHandle getElement = getElementGetter(returnType, programPoint);
if (getElement != null) {
getElement = MH.filterArguments(getElement, 0, MH.asType(getArray, getArray.type().changeReturnType(clazz)));
final MethodHandle guard = MH.insertArguments(FAST_ACCESS_GUARD, 0, clazz);
return new GuardedInvocation(getElement, guard, (SwitchPoint)null, ClassCastException.class);
}
}
}
return null;
}
示例4: CatchExceptionTest
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
public CatchExceptionTest(TestCase testCase, final boolean isVararg, final int argsCount,
final int catchDrops) {
this.testCase = testCase;
this.dropped = catchDrops;
MethodHandle thrower = testCase.thrower;
int throwerLen = thrower.type().parameterCount();
List<Class<?>> classes;
int extra = Math.max(0, argsCount - throwerLen);
classes = getThrowerParams(isVararg, extra);
this.argsCount = throwerLen + classes.size();
thrower = Helper.addTrailingArgs(thrower, this.argsCount, classes);
if (isVararg && argsCount > throwerLen) {
MethodType mt = thrower.type();
Class<?> lastParam = mt.parameterType(mt.parameterCount() - 1);
thrower = thrower.asVarargsCollector(lastParam);
}
this.thrower = thrower;
this.dropped = Math.min(this.argsCount, catchDrops);
catcher = testCase.getCatcher(getCatcherParams());
nargs = Math.max(2, this.argsCount);
}
示例5: adjustArity
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
static MethodHandle adjustArity(MethodHandle mh, int arity) {
MethodType mt = mh.type();
int posArgs = mt.parameterCount() - 1;
Class<?> reptype = mt.parameterType(posArgs).getComponentType();
MethodType mt1 = mt.dropParameterTypes(posArgs, posArgs+1);
while (mt1.parameterCount() < arity) {
Class<?> pt = reptype;
if (pt == Object.class && posArgs > 0)
// repeat types cyclically if possible:
pt = mt1.parameterType(mt1.parameterCount() - posArgs);
mt1 = mt1.appendParameterTypes(pt);
}
try {
return mh.asType(mt1);
} catch (WrongMethodTypeException | IllegalArgumentException ex) {
throw new IllegalArgumentException("cannot convert to type "+mt1+" from "+mh, ex);
}
}
示例6: widen
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
private static MethodType widen(final MethodType cftype) {
final Class<?>[] paramTypes = new Class<?>[cftype.parameterCount()];
for (int i = 0; i < cftype.parameterCount(); i++) {
paramTypes[i] = cftype.parameterType(i).isPrimitive() ? cftype.parameterType(i) : Object.class;
}
return MH.type(cftype.returnType(), paramTypes);
}
示例7: needsCallee
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
static boolean needsCallee(final MethodType type) {
final int length = type.parameterCount();
if (length == 0) {
return false;
}
final Class<?> param0 = type.parameterType(0);
return param0 == ScriptFunction.class || param0 == boolean.class && length > 1 && type.parameterType(1) == ScriptFunction.class;
}
示例8: isOfClass
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
/**
* Creates a guard method handle with arguments of a specified type, but with boolean return value. When invoked, it
* returns true if the first argument is of the specified class (exactly of it, not a subclass). The rest of the
* arguments will be ignored.
*
* @param clazz the class of the first argument to test for
* @param type the method type
* @return a method handle testing whether its first argument is of the specified class.
*/
@SuppressWarnings("boxing")
public static MethodHandle isOfClass(final Class<?> clazz, final MethodType type) {
final Class<?> declaredType = type.parameterType(0);
if(clazz == declaredType) {
LOG.log(Level.WARNING, "isOfClassGuardAlwaysTrue", new Object[] { clazz.getName(), 0, type, DynamicLinker.getLinkedCallSiteLocation() });
return constantTrue(type);
}
if(!declaredType.isAssignableFrom(clazz)) {
LOG.log(Level.WARNING, "isOfClassGuardAlwaysFalse", new Object[] { clazz.getName(), 0, type, DynamicLinker.getLinkedCallSiteLocation() });
return constantFalse(type);
}
return getClassBoundArgumentTest(IS_OF_CLASS, clazz, 0, type);
}
示例9: isArray
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
/**
* Creates a method handle that returns true if the argument in the specified position is a Java array.
*
* @param pos the position in the argument lit
* @param type the method type of the handle
* @return a method handle that returns true if the argument in the specified position is a Java array; the rest of
* the arguments are ignored.
*/
@SuppressWarnings("boxing")
public static MethodHandle isArray(final int pos, final MethodType type) {
final Class<?> declaredType = type.parameterType(pos);
if(declaredType.isArray()) {
LOG.log(Level.WARNING, "isArrayGuardAlwaysTrue", new Object[] { pos, type, DynamicLinker.getLinkedCallSiteLocation() });
return constantTrue(type);
}
if(!declaredType.isAssignableFrom(Object[].class)) {
LOG.log(Level.WARNING, "isArrayGuardAlwaysFalse", new Object[] { pos, type, DynamicLinker.getLinkedCallSiteLocation() });
return constantFalse(type);
}
return asType(IS_ARRAY, pos, type);
}
示例10: isInstance
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
/**
* Creates a method handle with arguments of a specified type, but with boolean return value. When invoked, it
* returns true if the n'th argument is instance of the specified class or its subclass). The rest of the arguments
* will be ignored.
*
* @param clazz the class of the first argument to test for
* @param pos the position on the argument list to test
* @param type the method type
* @return a method handle testing whether its first argument is of the specified class or subclass.
*/
@SuppressWarnings("boxing")
public static MethodHandle isInstance(final Class<?> clazz, final int pos, final MethodType type) {
final Class<?> declaredType = type.parameterType(pos);
if(clazz.isAssignableFrom(declaredType)) {
LOG.log(Level.WARNING, "isInstanceGuardAlwaysTrue", new Object[] { clazz.getName(), pos, type, DynamicLinker.getLinkedCallSiteLocation() });
return constantTrue(type);
}
if(!declaredType.isAssignableFrom(clazz)) {
LOG.log(Level.WARNING, "isInstanceGuardAlwaysFalse", new Object[] { clazz.getName(), pos, type, DynamicLinker.getLinkedCallSiteLocation() });
return constantFalse(type);
}
return getClassBoundArgumentTest(IS_INSTANCE, clazz, pos, type);
}
示例11: findCallMethod
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
private static GuardedInvocation findCallMethod(final CallSiteDescriptor desc) {
MethodHandle mh = NashornCallSiteDescriptor.isScope(desc)? JSOBJECT_SCOPE_CALL : JSOBJECT_CALL;
if (NashornCallSiteDescriptor.isApplyToCall(desc)) {
mh = MH.insertArguments(JSOBJECT_CALL_TO_APPLY, 0, mh);
}
final MethodType type = desc.getMethodType();
mh = type.parameterType(type.parameterCount() - 1) == Object[].class ?
mh :
MH.asCollector(mh, Object[].class, type.parameterCount() - 2);
return new GuardedInvocation(mh, IS_JSOBJECT_GUARD);
}
示例12: getParameterClass
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
private static Class<?> getParameterClass(final MethodType t, final int l, final int i, final boolean varArgs) {
return varArgs && i >= l - 1 ? t.parameterType(l - 1).getComponentType() : t.parameterType(i);
}
示例13: getGuardedInvocation
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
@Override
public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest, final LinkerServices linkerServices) throws Exception {
final Object objBoundCallable = linkRequest.getReceiver();
if(!(objBoundCallable instanceof BoundCallable)) {
return null;
}
final CallSiteDescriptor descriptor = linkRequest.getCallSiteDescriptor();
final Operation operation = NamedOperation.getBaseOperation(descriptor.getOperation());
// We need to distinguish NEW from CALL because CALL sites have parameter list of the form
// "callee, this, args", while NEW sites have "callee, args" -- they lack the "this" parameter.
final boolean isCall;
if (operation == StandardOperation.NEW) {
isCall = false;
} else if (operation == StandardOperation.CALL) {
isCall = true;
} else {
// Only CALL and NEW are supported.
return null;
}
final BoundCallable boundCallable = (BoundCallable)objBoundCallable;
final Object callable = boundCallable.getCallable();
final Object boundThis = boundCallable.getBoundThis();
// We need to ask the linker services for a delegate invocation on the target callable.
// Replace arguments (boundCallable[, this], args) => (callable[, boundThis], boundArgs, args) when delegating
final Object[] args = linkRequest.getArguments();
final Object[] boundArgs = boundCallable.getBoundArgs();
final int argsLen = args.length;
final int boundArgsLen = boundArgs.length;
final Object[] newArgs = new Object[argsLen + boundArgsLen];
newArgs[0] = callable;
final int firstArgIndex;
if (isCall) {
newArgs[1] = boundThis;
firstArgIndex = 2;
} else {
firstArgIndex = 1;
}
System.arraycopy(boundArgs, 0, newArgs, firstArgIndex, boundArgsLen);
System.arraycopy(args, firstArgIndex, newArgs, firstArgIndex + boundArgsLen, argsLen - firstArgIndex);
// Use R(T0, T1, T2, ...) => R(callable.class, boundThis.class, boundArg0.class, ..., boundArgn.class, T2, ...)
// call site type when delegating to underlying linker (for NEW, there's no this).
final MethodType type = descriptor.getMethodType();
// Use R(T0, ...) => R(callable.class, ...)
MethodType newMethodType = descriptor.getMethodType().changeParameterType(0, callable.getClass());
if (isCall) {
// R(callable.class, T1, ...) => R(callable.class, boundThis.class, ...)
newMethodType = newMethodType.changeParameterType(1, boundThis == null? Object.class : boundThis.getClass());
}
// R(callable.class[, boundThis.class], T2, ...) => R(callable.class[, boundThis.class], boundArg0.class, ..., boundArgn.class, T2, ...)
for(int i = boundArgs.length; i-- > 0;) {
newMethodType = newMethodType.insertParameterTypes(firstArgIndex, boundArgs[i] == null ? Object.class : boundArgs[i].getClass());
}
final CallSiteDescriptor newDescriptor = descriptor.changeMethodType(newMethodType);
// Delegate to target's linker
final GuardedInvocation inv = linkerServices.getGuardedInvocation(linkRequest.replaceArguments(newDescriptor, newArgs));
if(inv == null) {
return null;
}
// Bind (callable[, boundThis], boundArgs) to the delegate handle
final MethodHandle boundHandle = MethodHandles.insertArguments(inv.getInvocation(), 0,
Arrays.copyOf(newArgs, firstArgIndex + boundArgs.length));
final Class<?> p0Type = type.parameterType(0);
final MethodHandle droppingHandle;
if (isCall) {
// Ignore incoming boundCallable and this
droppingHandle = MethodHandles.dropArguments(boundHandle, 0, p0Type, type.parameterType(1));
} else {
// Ignore incoming boundCallable
droppingHandle = MethodHandles.dropArguments(boundHandle, 0, p0Type);
}
// Identity guard on boundCallable object
final MethodHandle newGuard = Guards.getIdentityGuard(boundCallable);
return inv.replaceMethods(droppingHandle, newGuard.asType(newGuard.type().changeParameterType(0, p0Type)));
}
示例14: isApplicableDynamically
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
private static boolean isApplicableDynamically(final LinkerServices linkerServices, final MethodType callSiteType,
final SingleDynamicMethod m) {
final MethodType methodType = m.getMethodType();
final boolean varArgs = m.isVarArgs();
final int fixedArgLen = methodType.parameterCount() - (varArgs ? 1 : 0);
final int callSiteArgLen = callSiteType.parameterCount();
// Arity checks
if(varArgs) {
if(callSiteArgLen < fixedArgLen) {
return false;
}
} else if(callSiteArgLen != fixedArgLen) {
return false;
}
// Fixed arguments type checks, starting from 1, as receiver type doesn't participate
for(int i = 1; i < fixedArgLen; ++i) {
if(!isApplicableDynamically(linkerServices, callSiteType.parameterType(i), methodType.parameterType(i))) {
return false;
}
}
if(!varArgs) {
// Not vararg; both arity and types matched.
return true;
}
final Class<?> varArgArrayType = methodType.parameterType(fixedArgLen);
final Class<?> varArgType = varArgArrayType.getComponentType();
if(fixedArgLen == callSiteArgLen - 1) {
// Exactly one vararg; check both array type matching and array component type matching.
final Class<?> callSiteArgType = callSiteType.parameterType(fixedArgLen);
return isApplicableDynamically(linkerServices, callSiteArgType, varArgArrayType)
|| isApplicableDynamically(linkerServices, callSiteArgType, varArgType);
}
// Either zero, or more than one vararg; check if all actual vararg types match the vararg array component type.
for(int i = fixedArgLen; i < callSiteArgLen; ++i) {
if(!isApplicableDynamically(linkerServices, callSiteType.parameterType(i), varArgType)) {
return false;
}
}
return true;
}
示例15: getElementSetter
import java.lang.invoke.MethodType; //导入方法依赖的package包/类
private GuardedInvocationComponent getElementSetter(final CallSiteDescriptor callSiteDescriptor,
final LinkerServices linkerServices, final List<String> operations) throws Exception {
final MethodType callSiteType = callSiteDescriptor.getMethodType();
final Class<?> declaredType = callSiteType.parameterType(0);
final GuardedInvocationComponent gic;
// If declared type of receiver at the call site is already an array, a list or map, bind without guard. Thing
// is, it'd be quite stupid of a call site creator to go though invokedynamic when it knows in advance they're
// dealing with an array, or a list or map, but hey...
// Note that for arrays and lists, using LinkerServices.asType() will ensure that any language specific linkers
// in use will get a chance to perform any (if there's any) implicit conversion to integer for the indices.
final boolean isMap;
if(declaredType.isArray()) {
gic = new GuardedInvocationComponent(MethodHandles.arrayElementSetter(declaredType));
isMap = false;
} else if(List.class.isAssignableFrom(declaredType)) {
gic = new GuardedInvocationComponent(SET_LIST_ELEMENT);
isMap = false;
} else if(Map.class.isAssignableFrom(declaredType)) {
gic = new GuardedInvocationComponent(PUT_MAP_ELEMENT);
isMap = true;
} else if(clazz.isArray()) {
gic = getClassGuardedInvocationComponent(MethodHandles.arrayElementSetter(clazz), callSiteType);
isMap = false;
} else if(List.class.isAssignableFrom(clazz)) {
gic = new GuardedInvocationComponent(SET_LIST_ELEMENT, Guards.asType(LIST_GUARD, callSiteType), List.class,
ValidationType.INSTANCE_OF);
isMap = false;
} else if(Map.class.isAssignableFrom(clazz)) {
gic = new GuardedInvocationComponent(PUT_MAP_ELEMENT, Guards.asType(MAP_GUARD, callSiteType), Map.class,
ValidationType.INSTANCE_OF);
isMap = true;
} else {
// Can't set elements for objects that are neither arrays, nor list, nor maps.
gic = null;
isMap = false;
}
// In contrast to, say, getElementGetter, we only compute the nextComponent if the target object is not a map,
// as maps will always succeed in setting the element and will never need to fall back to the next component
// operation.
final GuardedInvocationComponent nextComponent = isMap ? null : getGuardedInvocationComponent(
callSiteDescriptor, linkerServices, operations);
if(gic == null) {
return nextComponent;
}
// We can have "dyn:setElem:foo", especially in composites, i.e. "dyn:setElem|setProp:foo"
final String fixedKey = getFixedKey(callSiteDescriptor);
// Convert the key to a number if we're working with a list or array
final Object typedFixedKey;
if(!isMap && fixedKey != null) {
typedFixedKey = convertKeyToInteger(fixedKey, linkerServices);
if(typedFixedKey == null) {
// key is not numeric, it can never succeed
return nextComponent;
}
} else {
typedFixedKey = fixedKey;
}
final GuardedInvocation gi = gic.getGuardedInvocation();
final Binder binder = new Binder(linkerServices, callSiteType, typedFixedKey);
final MethodHandle invocation = gi.getInvocation();
if(nextComponent == null) {
return gic.replaceInvocation(binder.bind(invocation));
}
final MethodHandle checkGuard = convertArgToInt(invocation == SET_LIST_ELEMENT ? RANGE_CHECK_LIST :
RANGE_CHECK_ARRAY, linkerServices, callSiteDescriptor);
final MethodPair matchedInvocations = matchReturnTypes(binder.bind(invocation),
nextComponent.getGuardedInvocation().getInvocation());
return nextComponent.compose(matchedInvocations.guardWithTest(binder.bindTest(checkGuard)), gi.getGuard(),
gic.getValidatorClass(), gic.getValidationType());
}