Examples of java.lang.invoke.CallSite.dynamicInvoker()

java.lang.invoke.CallSite.dynamicInvoker()
Produces a method handle equivalent to an invokedynamic instruction which has been linked to this call site.
This method is equivalent to the following code:
```
 {@code MethodHandle getTarget, invoker, result; getTarget = MethodHandles.publicLookup().bind(this, "getTarget", MethodType.methodType(MethodHandle.class)); invoker = MethodHandles.exactInvoker(this.type()); result = MethodHandles.foldArguments(invoker, getTarget)}
```
@return a method handle which always invokes this call site's current target


  @Test
  public void check_equals() throws Throwable {
    CallSite equals = MethodInvocationSupport.bootstrap(lookup(), "equals", methodType(Object.class, Object.class, Object.class), 0);
    Person julien = julien();
    Boolean result = (Boolean) equals.dynamicInvoker().invokeWithArguments(julien, julien);
    assertThat(result, is(true));
  }


  @Test
  public void check_field_read() throws Throwable {

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  }


  @Test
  public void check_field_read() throws Throwable {
    CallSite name = MethodInvocationSupport.bootstrap(lookup(), "name", methodType(Object.class, Object.class), 0);
    String result = (String) name.dynamicInvoker().invokeWithArguments(julien());
    assertThat(result, notNullValue());
    assertThat(result, is("Julien"));
  }


  @Test(expectedExceptions = NoSuchMethodError.class)

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  }


  @Test(expectedExceptions = NoSuchMethodError.class)
  public void check_bogus() throws Throwable {
    CallSite bogus = MethodInvocationSupport.bootstrap(lookup(), "bogus", methodType(Object.class, Object.class), 0);
    bogus.dynamicInvoker().invokeWithArguments(julien());
  }


  @Test
  public void check_many_to_string() throws Throwable {
    CallSite toString = MethodInvocationSupport.bootstrap(lookup(), "toString", methodType(Object.class, Object.class), 0);

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  }


  @Test
  public void check_many_to_string() throws Throwable {
    CallSite toString = MethodInvocationSupport.bootstrap(lookup(), "toString", methodType(Object.class, Object.class), 0);
    MethodHandle toStringMH = toString.dynamicInvoker();


    for (int i = 0; i < 5; i++) {
      String result = (String) toStringMH.invokeWithArguments(julien());
      assertThat(result, is("Person{name='Julien', email='julien.ponge@insa-lyon.fr'}"));

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  @Test
  public void check_primitive_argument_allowance() throws Throwable {
    List<String> list = Arrays.asList("a", "b", "c");
    CallSite get = MethodInvocationSupport.bootstrap(lookup(), "get", methodType(Object.class, Object.class, Object.class), 0);


    MethodHandle handle = get.dynamicInvoker();
    assertThat(((String) handle.invokeWithArguments(list, 0)), is("a"));
    assertThat(((String) handle.invokeWithArguments(list, 1)), is("b"));
    assertThat(((String) handle.invokeWithArguments(list, 2)), is("c"));
  }

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  @Test
  public void check_varags() throws Throwable {
    CallSite concat = MethodInvocationSupport.bootstrap(lookup(), "concat", methodType(Object.class, Object.class, Object.class, Object.class, Object.class, Object.class), 0);
    VarargsChecking receiver = varargsChecking();


    Object result = concat.dynamicInvoker().invokeWithArguments(receiver, "-", "a", "b", "c");
    assertThat(result, notNullValue());
    assertThat(result, instanceOf(String.class));
    assertThat((String) result, is("a-b-c"));


    concat = MethodInvocationSupport.bootstrap(lookup(), "concat", methodType(Object.class, Object.class, Object.class, Object.class), 0);

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    assertThat(result, notNullValue());
    assertThat(result, instanceOf(String.class));
    assertThat((String) result, is("a-b-c"));


    concat = MethodInvocationSupport.bootstrap(lookup(), "concat", methodType(Object.class, Object.class, Object.class, Object.class), 0);
    result = concat.dynamicInvoker().invokeWithArguments(receiver, "-", new String[]{"a", "b", "c"});
    assertThat(result, notNullValue());
    assertThat(result, instanceOf(String.class));
    assertThat((String) result, is("a-b-c"));
  }

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  @Test
  public void check_varags_only() throws Throwable {
    CallSite concat = MethodInvocationSupport.bootstrap(lookup(), "defaultConcat", methodType(Object.class, Object.class, Object.class, Object.class, Object.class), 0);
    VarargsChecking receiver = varargsChecking();


    Object result = concat.dynamicInvoker().invokeWithArguments(receiver, "a", "b", "c");
    assertThat(result, notNullValue());
    assertThat(result, instanceOf(String.class));
    assertThat((String) result, is("a-b-c"));


    concat = MethodInvocationSupport.bootstrap(lookup(), "defaultConcat", methodType(Object.class, Object.class, Object.class), 0);

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    assertThat(result, notNullValue());
    assertThat(result, instanceOf(String.class));
    assertThat((String) result, is("a-b-c"));


    concat = MethodInvocationSupport.bootstrap(lookup(), "defaultConcat", methodType(Object.class, Object.class, Object.class), 0);
    result = concat.dynamicInvoker().invokeWithArguments(receiver, new String[]{"a", "b", "c"});
    assertThat(result, notNullValue());
    assertThat(result, instanceOf(String.class));
    assertThat((String) result, is("a-b-c"));


    concat = MethodInvocationSupport.bootstrap(lookup(), "defaultConcat", methodType(Object.class, Object.class, Object.class), 0);

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    assertThat(result, instanceOf(String.class));
    assertThat((String) result, is("a-b-c"));


    concat = MethodInvocationSupport.bootstrap(lookup(), "defaultConcat", methodType(Object.class, Object.class, Object.class), 0);
    receiver = varargsChecking();
    assertThat((String) concat.dynamicInvoker().invokeWithArguments(receiver, "a"), is("a"));


    concat = MethodInvocationSupport.bootstrap(lookup(), "defaultConcat", methodType(Object.class, Object.class), 0);
    receiver = varargsChecking();
    assertThat((String) concat.dynamicInvoker().invokeWithArguments(receiver), is(""));
  }

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