java.lang.invoke.MethodHandle.isVarargsCollector()方法的使用及代码示例

x33g5p2x  于2022-01-24 转载在 其他  
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本文整理了Java中java.lang.invoke.MethodHandle.isVarargsCollector()方法的一些代码示例，展示了MethodHandle.isVarargsCollector()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。MethodHandle.isVarargsCollector()方法的具体详情如下：
包路径：java.lang.invoke.MethodHandle
类名称：MethodHandle
方法名：isVarargsCollector

MethodHandle.isVarargsCollector介绍

[英]Determines if this method handle supports #asVarargsCollector calls. Such method handles arise from the following sources:

  • a call to #asVarargsCollector
  • a call to a java.lang.invoke.MethodHandles.Lookupwhich resolves to a variable arity Java method or constructor
  • an ldc instruction of a CONSTANT_MethodHandlewhich resolves to a variable arity Java method or constructor
    [中]确定此方法句柄是否支持#asVarargsCollector调用。此类方法句柄来自以下来源：
    *调用#asVarargsCollector
    *对java的调用。lang.invoke。方法句柄。解析为变量arity Java方法或构造函数的查找
    *一种常量方法句柄的ldc指令，它解析为一个变量arity Java方法或构造函数

代码示例

代码示例来源：origin: prestodb/presto

  1. public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
  2. {
  3.   this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  4.   this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  5.   this.arguments = unmodifiableList(new ArrayList<>(arguments));
  6.   this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  7.   Set<String> names = new HashSet<>();
  8.   for (Argument argument : arguments) {
  9.     checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  10.   }
  11.   checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  12.   checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  13.   long parameterCount = methodHandle.type().parameterList().stream()
  14.       .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
  15.       .count();
  16.   checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
  17. }

代码示例来源：origin: prestodb/presto

  1. public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
  2. {
  3.   this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  4.   this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  5.   this.arguments = unmodifiableList(new ArrayList<>(arguments));
  6.   this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  7.   Set<String> names = new HashSet<>();
  8.   for (Argument argument : arguments) {
  9.     checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  10.   }
  11.   checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  12.   checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  13.   long parameterCount = methodHandle.type().parameterList().stream()
  14.       .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
  15.       .count();
  16.   checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
  17. }

代码示例来源：origin: szegedi/dynalink

  1. @Override
  2. boolean isVarArgs() {
  3.   return target.isVarargsCollector();
  4. }

代码示例来源：origin: org.dynalang/dynalink

  1. @Override
  2. boolean isVarArgs() {
  3.   return target.isVarargsCollector();
  4. }

代码示例来源：origin: eclipse/golo-lang

  1. public boolean isVarargsCollector() {
  2.  return handle.isVarargsCollector();
  3. }

代码示例来源：origin: eclipse/golo-lang

  1. @Override
  2. public String toString() {
  3.  return String.format("FunctionReference{handle=%s%s, parameterNames=%s}",
  4.    handle.isVarargsCollector() ? "(varargs)" : "",
  5.    handle,
  6.    Arrays.toString(parameterNames));
  7. }

代码示例来源：origin: org.dynalang/dynalink

  1. private static void appendSig(StringBuilder b, MethodHandle m) {
  2.   b.append('(');
  3.   appendTypes(b, m.type().parameterArray(), m.isVarargsCollector());
  4.   b.append(')');
  5. }

代码示例来源：origin: szegedi/dynalink

  1. private static void appendSig(final StringBuilder b, final MethodHandle m) {
  2.   b.append('(');
  3.   appendTypes(b, m.type().parameterArray(), m.isVarargsCollector());
  4.   b.append(')');
  5. }

代码示例来源：origin: szegedi/dynalink

  1. @SuppressWarnings("unused")
  2. private void throwAmbiguousMethod(final Class<?>[] argTypes, final List<MethodHandle> methods) throws NoSuchMethodException {
  3.   final String arity = methods.get(0).isVarargsCollector() ? "variable" : "fixed";
  4.   throw new NoSuchMethodException("Can't unambiguously select between " + arity + " arity signatures " +
  5.       getSignatureList(methods) + " of the method " + parent.getName() + " for argument types " +
  6.       argTypesString(argTypes));
  7. }

代码示例来源：origin: org.dynalang/dynalink

  1. @SuppressWarnings("unused")
  2. private void throwAmbiguousMethod(Class<?>[] argTypes, List<MethodHandle> methods) throws NoSuchMethodException {
  3.   final String arity = methods.get(0).isVarargsCollector() ? "variable" : "fixed";
  4.   throw new NoSuchMethodException("Can't unambiguously select between " + arity + " arity signatures " +
  5.       getSignatureList(methods) + " of the method " + parent.getName() + " for argument types " +
  6.       argTypesString(argTypes));
  7. }

代码示例来源：origin: org.dynalang/dynalink

  1. private static MethodHandle dropReceiver(final MethodHandle mh, final Class<?> receiverClass) {
  2.     MethodHandle newHandle = MethodHandles.dropArguments(mh, 0, receiverClass);
  3.     // NOTE: this is a workaround for the fact that dropArguments doesn't preserve vararg collector state.
  4.     if(mh.isVarargsCollector() && !newHandle.isVarargsCollector()) {
  5.       final MethodType type = mh.type();
  6.       newHandle = newHandle.asVarargsCollector(type.parameterType(type.parameterCount() - 1));
  7.     }
  8.     return newHandle;
  9.   }
  10. }

代码示例来源：origin: szegedi/dynalink

  1. private static MethodHandle dropReceiver(final MethodHandle mh, final Class<?> receiverClass) {
  2.     MethodHandle newHandle = MethodHandles.dropArguments(mh, 0, receiverClass);
  3.     // NOTE: this is a workaround for the fact that dropArguments doesn't preserve vararg collector state.
  4.     if(mh.isVarargsCollector() && !newHandle.isVarargsCollector()) {
  5.       final MethodType type = mh.type();
  6.       newHandle = newHandle.asVarargsCollector(type.parameterType(type.parameterCount() - 1));
  7.     }
  8.     return newHandle;
  9.   }
  10. }

代码示例来源：origin: com.facebook.presto/presto-spi

  1. public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
  2. {
  3.   this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  4.   this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  5.   this.arguments = unmodifiableList(new ArrayList<>(arguments));
  6.   this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  7.   Set<String> names = new HashSet<>();
  8.   for (Argument argument : arguments) {
  9.     checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  10.   }
  11.   checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  12.   checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  13.   long parameterCount = methodHandle.type().parameterList().stream()
  14.       .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
  15.       .count();
  16.   checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
  17. }

代码示例来源：origin: com.facebook.presto/presto-jdbc

  1. public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
  2. {
  3.   this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  4.   this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  5.   this.arguments = unmodifiableList(new ArrayList<>(arguments));
  6.   this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  7.   Set<String> names = new HashSet<>();
  8.   for (Argument argument : arguments) {
  9.     checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  10.   }
  11.   checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  12.   checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  13.   long parameterCount = methodHandle.type().parameterList().stream()
  14.       .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
  15.       .count();
  16.   checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
  17. }

代码示例来源：origin: prestosql/presto

  1. public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
  2. {
  3.   this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  4.   this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  5.   this.arguments = unmodifiableList(new ArrayList<>(arguments));
  6.   this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  7.   Set<String> names = new HashSet<>();
  8.   for (Argument argument : arguments) {
  9.     checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  10.   }
  11.   checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  12.   checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  13.   long parameterCount = methodHandle.type().parameterList().stream()
  14.       .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
  15.       .count();
  16.   checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
  17. }

代码示例来源：origin: io.prestosql/presto-jdbc

  1. public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
  2. {
  3.   this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  4.   this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  5.   this.arguments = unmodifiableList(new ArrayList<>(arguments));
  6.   this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  7.   Set<String> names = new HashSet<>();
  8.   for (Argument argument : arguments) {
  9.     checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  10.   }
  11.   checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  12.   checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  13.   long parameterCount = methodHandle.type().parameterList().stream()
  14.       .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
  15.       .count();
  16.   checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
  17. }

代码示例来源：origin: prestosql/presto

  1. public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
  2. {
  3.   this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  4.   this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  5.   this.arguments = unmodifiableList(new ArrayList<>(arguments));
  6.   this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  7.   Set<String> names = new HashSet<>();
  8.   for (Argument argument : arguments) {
  9.     checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  10.   }
  11.   checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  12.   checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  13.   long parameterCount = methodHandle.type().parameterList().stream()
  14.       .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
  15.       .count();
  16.   checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
  17. }

代码示例来源：origin: eclipse/golo-lang

  1. public MethodHandle coerce(MethodHandle target) {
  2.  if (target.isVarargsCollector() && isLastArgumentAnArray()) {
  3.   return target.asFixedArity().asType(type);
  4.  }
  5.  return target.asType(type);
  6. }

代码示例来源：origin: anba/es6draft

  1. private static MethodHandle toCanonical(MethodHandle handle, int fixedArguments, boolean varargs, Method method) {
  2.   assert !handle.isVarargsCollector();
  3.   MethodType type = handle.type();
  4.   int actual = type.parameterCount() - fixedArguments - (varargs ? 1 : 0);
  5.   Object[] defaults = method != null ? methodDefaults(method, fixedArguments, actual) : null;
  6.   MethodHandle filter = Parameters.filter(actual, varargs, defaults);
  7.   MethodHandle spreader = MethodHandles.spreadInvoker(type, fixedArguments);
  8.   spreader = MethodHandles.insertArguments(spreader, 0, handle);
  9.   spreader = MethodHandles.filterArguments(spreader, fixedArguments, filter);
  10.   return spreader;
  11. }

代码示例来源：origin: eclipse/golo-lang

  1. /**
  2.  * Spread arguments over this function parameters.
  3.  *
  4.  * @param arguments arguments as an array.
  5.  * @return a return value.
  6.  * @throws Throwable ...because an exception can be thrown.
  7.  */
  8. public Object spread(Object... arguments) throws Throwable {
  9.  int arity = arity();
  10.  if (this.handle.isVarargsCollector() && (arity > 0) && (arguments[arity - 1] instanceof Object[])) {
  11.   return this.handle
  12.     .asFixedArity()
  13.     .asSpreader(Object[].class, arguments.length)
  14.     .invoke(arguments);
  15.  }
  16.  return this.handle
  17.    .asSpreader(Object[].class, arguments.length)
  18.    .invoke(arguments);
  19. }

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