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

public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
{
  this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  this.arguments = unmodifiableList(new ArrayList<>(arguments));
  this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  Set<String> names = new HashSet<>();
  for (Argument argument : arguments) {
    checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  }
  checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  long parameterCount = methodHandle.type().parameterList().stream()
      .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
      .count();
  checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
}

代码示例来源：origin: prestodb/presto

public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
{
  this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  this.arguments = unmodifiableList(new ArrayList<>(arguments));
  this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  Set<String> names = new HashSet<>();
  for (Argument argument : arguments) {
    checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  }
  checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  long parameterCount = methodHandle.type().parameterList().stream()
      .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
      .count();
  checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
}

代码示例来源：origin: szegedi/dynalink

@Override
boolean isVarArgs() {
  return target.isVarargsCollector();
}

代码示例来源：origin: org.dynalang/dynalink

@Override
boolean isVarArgs() {
  return target.isVarargsCollector();
}

代码示例来源：origin: eclipse/golo-lang

public boolean isVarargsCollector() {
 return handle.isVarargsCollector();
}

代码示例来源：origin: eclipse/golo-lang

@Override
public String toString() {
 return String.format("FunctionReference{handle=%s%s, parameterNames=%s}",
   handle.isVarargsCollector() ? "(varargs)" : "",
   handle,
   Arrays.toString(parameterNames));
}

代码示例来源：origin: org.dynalang/dynalink

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

代码示例来源：origin: szegedi/dynalink

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

代码示例来源：origin: szegedi/dynalink

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

代码示例来源：origin: org.dynalang/dynalink

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

代码示例来源：origin: org.dynalang/dynalink

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

代码示例来源：origin: szegedi/dynalink

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

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

public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
{
  this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  this.arguments = unmodifiableList(new ArrayList<>(arguments));
  this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  Set<String> names = new HashSet<>();
  for (Argument argument : arguments) {
    checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  }
  checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  long parameterCount = methodHandle.type().parameterList().stream()
      .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
      .count();
  checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
}

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

public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
{
  this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  this.arguments = unmodifiableList(new ArrayList<>(arguments));
  this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  Set<String> names = new HashSet<>();
  for (Argument argument : arguments) {
    checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  }
  checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  long parameterCount = methodHandle.type().parameterList().stream()
      .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
      .count();
  checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
}

代码示例来源：origin: prestosql/presto

public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
{
  this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  this.arguments = unmodifiableList(new ArrayList<>(arguments));
  this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  Set<String> names = new HashSet<>();
  for (Argument argument : arguments) {
    checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  }
  checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  long parameterCount = methodHandle.type().parameterList().stream()
      .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
      .count();
  checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
}

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

public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
{
  this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  this.arguments = unmodifiableList(new ArrayList<>(arguments));
  this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  Set<String> names = new HashSet<>();
  for (Argument argument : arguments) {
    checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  }
  checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  long parameterCount = methodHandle.type().parameterList().stream()
      .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
      .count();
  checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
}

代码示例来源：origin: prestosql/presto

public Procedure(String schema, String name, List<Argument> arguments, MethodHandle methodHandle)
{
  this.schema = checkNotNullOrEmpty(schema, "schema").toLowerCase(ENGLISH);
  this.name = checkNotNullOrEmpty(name, "name").toLowerCase(ENGLISH);
  this.arguments = unmodifiableList(new ArrayList<>(arguments));
  this.methodHandle = requireNonNull(methodHandle, "methodHandle is null");
  Set<String> names = new HashSet<>();
  for (Argument argument : arguments) {
    checkArgument(names.add(argument.getName()), "Duplicate argument name: " + argument.getName());
  }
  checkArgument(!methodHandle.isVarargsCollector(), "Method must have fixed arity");
  checkArgument(methodHandle.type().returnType() == void.class, "Method must return void");
  long parameterCount = methodHandle.type().parameterList().stream()
      .filter(type -> !ConnectorSession.class.isAssignableFrom(type))
      .count();
  checkArgument(parameterCount == arguments.size(), "Method parameter count must match arguments");
}

代码示例来源：origin: eclipse/golo-lang

public MethodHandle coerce(MethodHandle target) {
 if (target.isVarargsCollector() && isLastArgumentAnArray()) {
  return target.asFixedArity().asType(type);
 }
 return target.asType(type);
}

代码示例来源：origin: anba/es6draft

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

代码示例来源：origin: eclipse/golo-lang

/**
 * Spread arguments over this function parameters.
 *
 * @param arguments arguments as an array.
 * @return a return value.
 * @throws Throwable ...because an exception can be thrown.
 */
public Object spread(Object... arguments) throws Throwable {
 int arity = arity();
 if (this.handle.isVarargsCollector() && (arity > 0) && (arguments[arity - 1] instanceof Object[])) {
  return this.handle
    .asFixedArity()
    .asSpreader(Object[].class, arguments.length)
    .invoke(arguments);
 }
 return this.handle
   .asSpreader(Object[].class, arguments.length)
   .invoke(arguments);
}

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