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8158169: MethodHandles.dropArgumentsToMatch(...)

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Reviewed-by: psandoz, mhaupt
This commit is contained in:
Shilpi Rastogi 2016-07-07 09:51:47 +02:00
parent 3e0395eb84
commit aec121f999
2 changed files with 31 additions and 1 deletions
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3
jdk/src/java.base/share/classes/java/lang/invoke/MethodHandles.java
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@ -3427,7 +3427,8 @@ assertEquals("xy", h3.invoke("x", "y", 1, "a", "b", "c"));
* @return a possibly adapted method handle
* @throws NullPointerException if either argument is null
* @throws IllegalArgumentException if any element of {@code newTypes} is {@code void.class},
* or if either index is out of range in its corresponding list,
* or if {@code skip} is negative or greater than the arity of the target,
* or if {@code pos} is negative or greater than the newTypes list size,
* or if the non-skipped target parameter types match the new types at {@code pos}
* @since 9
*/

29
jdk/test/java/lang/invoke/DropArgumentsTest.java
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@ -24,6 +24,7 @@
*/
/* @test
* @bug 8158169
* @summary unit tests for java.lang.invoke.MethodHandles
* @run testng test.java.lang.invoke.DropArgumentsTest
*/
@ -32,6 +33,7 @@ package test.java.lang.invoke;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.Collections;
import java.util.List;
import static java.lang.invoke.MethodHandles.*;
import static java.lang.invoke.MethodType.*;
@ -78,6 +80,7 @@ public class DropArgumentsTest {
{cat, -1, bigType.parameterList(), 0},
{cat, 0, bigType.parameterList(), -1},
{cat, 3, bigType.parameterList(), 0},
{cat, 0, bigType.parameterList(), 6},
{cat, 0, bigType.parameterList(), 2}
};
}
@ -96,4 +99,30 @@ public class DropArgumentsTest {
MethodType bigTypewithVoid = cat.type().insertParameterTypes(0, void.class, String.class, int.class);
MethodHandle handle2 = MethodHandles.dropArgumentsToMatch(cat, 0, bigTypewithVoid.parameterList(), 1);
}
public static class MethodSet {
static void mVoid() {
}
static void mVoid(int t) {
}
}
@Test
public void dropArgumentsToMatchPosSkipRange() throws Throwable {
// newTypes.size() == 1, pos == 1 && target.paramSize() == 0, skip == 0
MethodHandle mh1 = MethodHandles.lookup().findStatic(MethodSet.class, "mVoid",
MethodType.methodType(void.class));
MethodHandle handle1 = dropArgumentsToMatch(mh1, 0, Collections.singletonList(int.class), 1);
assertEquals(1, handle1.type().parameterList().size());
// newTypes.size() == 1, pos == 0 && target.paramSize() == 1, skip == 1
MethodHandle mh2 = MethodHandles.lookup().findStatic(MethodSet.class, "mVoid",
MethodType.methodType(void.class, int.class));
MethodHandle handle2 = dropArgumentsToMatch(mh2, 1, Collections.singletonList(int.class), 0);
assertEquals(2, handle2.type().parameterList().size());
}
}