本文整理汇总了Java中java.lang.invoke.MethodHandles.guardWithTest方法的典型用法代码示例。如果您正苦于以下问题:Java MethodHandles.guardWithTest方法的具体用法?Java MethodHandles.guardWithTest怎么用?Java MethodHandles.guardWithTest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.MethodHandles
的用法示例。
在下文中一共展示了MethodHandles.guardWithTest方法的5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: compose
import java.lang.invoke.MethodHandles; //导入方法依赖的package包/类
/**
* Composes the invocation, switchpoint, and the guard into a composite method handle that knows how to fall back.
* @param switchpointFallback the fallback method handle in case switchpoint is invalidated.
* @param guardFallback the fallback method handle in case guard returns false.
* @param catchFallback the fallback method in case the exception handler triggers
* @return a composite method handle.
*/
public MethodHandle compose(final MethodHandle guardFallback, final MethodHandle switchpointFallback, final MethodHandle catchFallback) {
final MethodHandle guarded =
guard == null ?
invocation :
MethodHandles.guardWithTest(
guard,
invocation,
guardFallback);
final MethodHandle catchGuarded =
exception == null ?
guarded :
MH.catchException(
guarded,
exception,
MethodHandles.dropArguments(
catchFallback,
0,
exception));
if (switchPoints == null) {
return catchGuarded;
}
MethodHandle spGuarded = catchGuarded;
for (final SwitchPoint sp : switchPoints) {
spGuarded = sp.guardWithTest(spGuarded, switchpointFallback);
}
return spGuarded;
}
示例2: compose
import java.lang.invoke.MethodHandles; //导入方法依赖的package包/类
/**
* Composes the invocation, guard, switch points, and the exception into a
* composite method handle that knows how to fall back when the guard fails
* or the invocation is invalidated.
* @param switchpointFallback the fallback method handle in case a switch
* point is invalidated.
* @param guardFallback the fallback method handle in case guard returns
* false.
* @param catchFallback the fallback method in case the exception handler
* triggers.
* @return a composite method handle.
*/
public MethodHandle compose(final MethodHandle guardFallback, final MethodHandle switchpointFallback, final MethodHandle catchFallback) {
final MethodHandle guarded =
guard == null ?
invocation :
MethodHandles.guardWithTest(
guard,
invocation,
guardFallback);
final MethodHandle catchGuarded =
exception == null ?
guarded :
MethodHandles.catchException(
guarded,
exception,
MethodHandles.dropArguments(
catchFallback,
0,
exception));
if (switchPoints == null) {
return catchGuarded;
}
MethodHandle spGuarded = catchGuarded;
for (final SwitchPoint sp : switchPoints) {
spGuarded = sp.guardWithTest(spGuarded, switchpointFallback);
}
return spGuarded;
}
示例3: guardWithTest
import java.lang.invoke.MethodHandles; //导入方法依赖的package包/类
@Override
public MethodHandle guardWithTest(final MethodHandle test, final MethodHandle target, final MethodHandle fallback) {
final MethodHandle mh = MethodHandles.guardWithTest(test, target, fallback);
return debug(mh, "guardWithTest", test, target, fallback);
}
示例4: guardWithTest
import java.lang.invoke.MethodHandles; //导入方法依赖的package包/类
MethodHandle guardWithTest(final MethodHandle test) {
return MethodHandles.guardWithTest(test, method1, method2);
}
示例5: testGuardWithTest
import java.lang.invoke.MethodHandles; //导入方法依赖的package包/类
void testGuardWithTest(int nargs, int testDrops, Class<?> argClass) throws Throwable {
countTest();
int nargs1 = Math.min(3, nargs);
MethodHandle test = PRIVATE.findVirtual(Object.class, "equals", MethodType.methodType(boolean.class, Object.class));
MethodHandle target = PRIVATE.findStatic(MethodHandlesTest.class, "targetIfEquals", MethodType.genericMethodType(nargs1));
MethodHandle fallback = PRIVATE.findStatic(MethodHandlesTest.class, "fallbackIfNotEquals", MethodType.genericMethodType(nargs1));
while (test.type().parameterCount() > nargs)
// 0: test = constant(MISSING_ARG.equals(MISSING_ARG))
// 1: test = lambda (_) MISSING_ARG.equals(_)
test = MethodHandles.insertArguments(test, 0, MISSING_ARG);
if (argClass != Object.class) {
test = changeArgTypes(test, argClass);
target = changeArgTypes(target, argClass);
fallback = changeArgTypes(fallback, argClass);
}
int testArgs = nargs - testDrops;
assert(testArgs >= 0);
test = addTrailingArgs(test, Math.min(testArgs, nargs), argClass);
target = addTrailingArgs(target, nargs, argClass);
fallback = addTrailingArgs(fallback, nargs, argClass);
Object[][] argLists = {
{ },
{ "foo" }, { MISSING_ARG },
{ "foo", "foo" }, { "foo", "bar" },
{ "foo", "foo", "baz" }, { "foo", "bar", "baz" }
};
for (Object[] argList : argLists) {
Object[] argList1 = argList;
if (argList.length != nargs) {
if (argList.length != nargs1) continue;
argList1 = Arrays.copyOf(argList, nargs);
Arrays.fill(argList1, nargs1, nargs, MISSING_ARG_2);
}
MethodHandle test1 = test;
if (test1.type().parameterCount() > testArgs) {
int pc = test1.type().parameterCount();
test1 = MethodHandles.insertArguments(test, testArgs, Arrays.copyOfRange(argList1, testArgs, pc));
}
MethodHandle mh = MethodHandles.guardWithTest(test1, target, fallback);
assertEquals(target.type(), mh.type());
boolean equals;
switch (nargs) {
case 0: equals = true; break;
case 1: equals = MISSING_ARG.equals(argList[0]); break;
default: equals = argList[0].equals(argList[1]); break;
}
String willCall = (equals ? "targetIfEquals" : "fallbackIfNotEquals");
if (verbosity >= 3)
System.out.println(logEntry(willCall, argList));
Object result = mh.invokeWithArguments(argList1);
assertCalled(willCall, argList);
}
}