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Java MethodHandle.asSpreader方法代碼示例

本文整理匯總了Java中java.lang.invoke.MethodHandle.asSpreader方法的典型用法代碼示例。如果您正苦於以下問題：Java MethodHandle.asSpreader方法的具體用法？Java MethodHandle.asSpreader怎麽用？Java MethodHandle.asSpreader使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類java.lang.invoke.MethodHandle的用法示例。


在下文中一共展示了MethodHandle.asSpreader方法的7個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Java代碼示例。

示例1: testArities

import java.lang.invoke.MethodHandle; //導入方法依賴的package包/類
private void testArities(Class<? extends Object[]> cls,
                         int minArity,
                         int maxArity,
                         int iterations) throws Throwable {
    boolean verbose = (cls == Object[].class);
    for (int arity = minArity; arity <= maxArity; arity++) {
        if (verbose)  System.out.println("arity="+arity);
        MethodHandle mh = MH_hashArguments(cls, arity);
        MethodHandle mh_VA = mh.asSpreader(cls, arity);
        assert(mh_VA.type().parameterType(0) == cls);
        testArities(cls, arity, iterations, verbose, mh, mh_VA);
        // mh_CA will collect arguments of a particular type and pass them to mh_VA
        MethodHandle mh_CA = mh_VA.asCollector(cls, arity);
        MethodHandle mh_VA2 = mh_CA.asSpreader(cls, arity);
        assert(mh_CA.type().equals(mh.type()));
        assert(mh_VA2.type().equals(mh_VA.type()));
        if (cls != Object[].class) {
            try {
                mh_VA2.invokeWithArguments(new Object[arity]);
                throw new AssertionError("should not reach");
            } catch (ClassCastException | WrongMethodTypeException ex) {
            }
        }
        int iterations_VA = iterations / 100;
        testArities(cls, arity, iterations_VA, false, mh_CA, mh_VA2);
    }
}
開發者ID:lambdalab-mirror，項目名稱:jdk8u-jdk，代碼行數:28，代碼來源:BigArityTest.java

示例2: testAsSpreaderExample

import java.lang.invoke.MethodHandle; //導入方法依賴的package包/類
@Test
public static void testAsSpreaderExample() throws Throwable {
    // test the JavaDoc asSpreader-with-pos example
    MethodHandle compare = LOOKUP.findStatic(Objects.class, "compare", methodType(int.class, Object.class, Object.class, Comparator.class));
    MethodHandle compare2FromArray = compare.asSpreader(0, Object[].class, 2);
    Object[] ints = new Object[]{3, 9, 7, 7};
    Comparator<Integer> cmp = (a, b) -> a - b;
    assertTrue((int) compare2FromArray.invoke(Arrays.copyOfRange(ints, 0, 2), cmp) < 0);
    assertTrue((int) compare2FromArray.invoke(Arrays.copyOfRange(ints, 1, 3), cmp) > 0);
    assertTrue((int) compare2FromArray.invoke(Arrays.copyOfRange(ints, 2, 4), cmp) == 0);
}
開發者ID:AdoptOpenJDK，項目名稱:openjdk-jdk10，代碼行數:12，代碼來源:SpreadCollectTest.java

示例3: testArities

import java.lang.invoke.MethodHandle; //導入方法依賴的package包/類
private void testArities(Class<? extends Object[]> cls,
                         int minArity,
                         int maxArity,
                         int iterations) throws Throwable {
    boolean verbose = (cls == Object[].class);
    for (int arity = minArity; arity <= maxArity; arity++) {
        if (verbose)  System.out.println("arity="+arity);
        MethodHandle mh = MH_hashArguments(cls, arity);
        MethodHandle mh_VA = mh.asSpreader(cls, arity);
        MethodHandle mh_VA_h = mh.asSpreader(0, cls, arity-1);
        assert(mh_VA.type().parameterType(0) == cls);
        assert(mh_VA_h.type().parameterType(0) == cls);
        testArities(cls, arity, iterations, verbose, mh, mh_VA, mh_VA_h);
        // mh_CA will collect arguments of a particular type and pass them to mh_VA
        MethodHandle mh_CA = mh_VA.asCollector(cls, arity);
        MethodHandle mh_VA2 = mh_CA.asSpreader(cls, arity);
        MethodHandle mh_VA2_h = mh_CA.asSpreader(0, cls, arity-1);
        assert(mh_CA.type().equals(mh.type()));
        assert(mh_VA2.type().equals(mh_VA.type()));
        if (cls != Object[].class) {
            try {
                mh_VA2.invokeWithArguments(new Object[arity]);
                throw new AssertionError("should not reach");
            } catch (ClassCastException | WrongMethodTypeException ex) {
            }
        }
        int iterations_VA = iterations / 100;
        testArities(cls, arity, iterations_VA, false, mh_CA, mh_VA2, mh_VA2_h);
    }
}
開發者ID:AdoptOpenJDK，項目名稱:openjdk-jdk10，代碼行數:31，代碼來源:BigArityTest.java

示例4: asSpreader

import java.lang.invoke.MethodHandle; //導入方法依賴的package包/類
private static MethodHandle asSpreader(MethodHandle mh) {
  int paramCount = mh.type().parameterCount();
  if (mh.isVarargsCollector()) {
    if (paramCount == 1) {
      return mh;
    }

    return mh.asSpreader(Object[].class, paramCount - 1);
  }

  return mh.asSpreader(Object[].class, paramCount);
}
開發者ID:btk5h，項目名稱:skript-mirror，代碼行數:13，代碼來源:ExprJavaCall.java

示例5: asSpreader

import java.lang.invoke.MethodHandle; //導入方法依賴的package包/類
@Override
public MethodHandle asSpreader(final MethodHandle handle, final Class<?> arrayType, final int arrayLength) {
    final MethodHandle mh = handle.asSpreader(arrayType, arrayLength);
    return debug(mh, "asSpreader", handle, arrayType, arrayLength);
}
開發者ID:SunburstApps，項目名稱:OpenJSharp，代碼行數:6，代碼來源:MethodHandleFactory.java

示例6: testSpreads

import java.lang.invoke.MethodHandle; //導入方法依賴的package包/類
@Test
public void testSpreads() throws Throwable {
    System.out.println("testing asSpreader on arity=3");
    Object[] args = testArgs(3);
    int r0 = Objects.hash(args);
    MethodHandle mh = MH_hashArguments(3);
    Object r;
    r = mh.invokeExact(args[0], args[1], args[2]);
    assertEquals(r0, r);
    r = mh.invoke(args[0], args[1], args[2]);
    assertEquals(r0, r);
    r = mh.invoke((Comparable) args[0], (Integer) args[1], (Number) args[2]);
    assertEquals(r0, r);
    r = mh.invokeWithArguments(args);
    assertEquals(r0, r);
    for (Class<?> cls0 : new Class<?>[] {
        Object[].class, Number[].class, Integer[].class, Comparable[].class
    }) {
        @SuppressWarnings("unchecked")
        Class<? extends Object[]> cls = (Class<? extends Object[]>) cls0;
        //Class<? extends Object[]> cls = Object[].class.asSubclass(cls0);
        int nargs = args.length, skip;
        MethodHandle smh = mh.asSpreader(cls, nargs - (skip = 0));
        Object[] tail = Arrays.copyOfRange(args, skip, nargs, cls);
        if (cls == Object[].class)
            r = smh.invokeExact(tail);
        else if (cls == Integer[].class)
            r = smh.invokeExact((Integer[]) tail); //warning OK, see 8019340
        else
            r = smh.invoke(tail);
        assertEquals(r0, r);
        smh = mh.asSpreader(cls, nargs - (skip = 1));
        tail = Arrays.copyOfRange(args, skip, nargs, cls);
        if (cls == Object[].class)
            r = smh.invokeExact(args[0], tail);
        else if (cls == Integer[].class)
            r = smh.invokeExact(args[0], (Integer[]) tail);
        else
            r = smh.invoke(args[0], tail);
        assertEquals(r0, r);
        smh = mh.asSpreader(cls, nargs - (skip = 2));
        tail = Arrays.copyOfRange(args, skip, nargs, cls);
        if (cls == Object[].class)
            r = smh.invokeExact(args[0], args[1], tail);
        else if (cls == Integer[].class)
            r = smh.invokeExact(args[0], args[1], (Integer[]) tail);
        else
            r = smh.invoke(args[0], args[1], tail);
        assertEquals(r0, r);
        smh = mh.asSpreader(cls, nargs - (skip = 3));
        tail = Arrays.copyOfRange(args, skip, nargs, cls);
        if (cls == Object[].class)
            r = smh.invokeExact(args[0], args[1], args[2], tail);
        else if (cls == Integer[].class)
            r = smh.invokeExact(args[0], args[1], args[2], (Integer[]) tail);
        else
            r = smh.invoke(args[0], args[1], args[2], tail);
        assertEquals(r0, r);
        // Try null array in addition to zero-length array:
        tail = null;
        if (cls == Object[].class)
            r = smh.invokeExact(args[0], args[1], args[2], tail);
        else if (cls == Integer[].class)
            r = smh.invokeExact(args[0], args[1], args[2], (Integer[]) tail);
        else
            r = smh.invoke(args[0], args[1], args[2], tail);
        assertEquals(r0, r);
    }
}
開發者ID:lambdalab-mirror，項目名稱:jdk8u-jdk，代碼行數:70，代碼來源:BigArityTest.java

示例7: testAsSpreaderIllegalMethodType

import java.lang.invoke.MethodHandle; //導入方法依賴的package包/類
@Test(expectedExceptions = {WrongMethodTypeException.class})
public static void testAsSpreaderIllegalMethodType() {
    MethodHandle h = MethodHandles.dropArguments(MethodHandles.constant(String.class, ""), 0, int.class, int.class);
    MethodHandle s = h.asSpreader(String[].class, 1);
}
開發者ID:AdoptOpenJDK，項目名稱:openjdk-jdk10，代碼行數:6，代碼來源:SpreadCollectTest.java


注：本文中的java.lang.invoke.MethodHandle.asSpreader方法示例由純淨天空整理自Github/MSDocs等開源代碼及文檔管理平台，相關代碼片段篩選自各路編程大神貢獻的開源項目，源碼版權歸原作者所有，傳播和使用請參考對應項目的License；未經允許，請勿轉載。