java.lang.invoke.MethodHandles.Lookup#dropLookupMode ( )源码实例Demo

下面列出了java.lang.invoke.MethodHandles.Lookup#dropLookupMode ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。

源代码1 项目： openjdk-jdk9 文件： DropLookupModeTest.java

/**
 * Starting with a full power Lookup, use dropLookupMode to create new Lookups
 * with reduced access.
 */
public void testReducingAccess() {
    Lookup lookup = MethodHandles.lookup();
    final Class<?> lc = lookup.lookupClass();
    assertTrue(lookup.lookupModes() == (PUBLIC|MODULE|PACKAGE|PROTECTED|PRIVATE));

    lookup = lookup.dropLookupMode(PROTECTED);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == (PUBLIC|MODULE|PACKAGE|PRIVATE));

    lookup = lookup.dropLookupMode(PRIVATE);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == (PUBLIC|MODULE|PACKAGE));

    lookup = lookup.dropLookupMode(PACKAGE);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == (PUBLIC|MODULE));

    lookup = lookup.dropLookupMode(MODULE);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == PUBLIC);

    lookup = lookup.dropLookupMode(PUBLIC);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == 0);

    // repeat with lookup has no access
    lookup = lookup.dropLookupMode(PUBLIC);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == 0);
}

源代码2 项目： openjdk-jdk9 文件： DropLookupModeTest.java

/**
 * Test dropLookupMode on the public Lookup.
 */
public void testPublicLookup() {
    final Lookup publicLookup = MethodHandles.publicLookup();
    final Class<?> lc = publicLookup.lookupClass();
    assertTrue(publicLookup.lookupModes() == (PUBLIC|UNCONDITIONAL));

    Lookup lookup = publicLookup.dropLookupMode(PRIVATE);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == PUBLIC);

    lookup = publicLookup.dropLookupMode(PROTECTED);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == PUBLIC);

    lookup = publicLookup.dropLookupMode(PACKAGE);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == PUBLIC);

    lookup = publicLookup.dropLookupMode(MODULE);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == PUBLIC);

    lookup = publicLookup.dropLookupMode(PUBLIC);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == 0);

    lookup = publicLookup.dropLookupMode(UNCONDITIONAL);
    assertTrue(lookup.lookupClass() == lc);
    assertTrue(lookup.lookupModes() == PUBLIC);
}

源代码3 项目： HotswapAgent 文件： DefineClassHelper.java

/**
 * Loads a class file by {@code java.lang.invoke.MethodHandles.Lookup}.
 *
 * @since 3.22
 */
static Class<?> toPublicClass(String className, byte[] bcode)
    throws CannotCompileException
{
    try {
        Lookup lookup = MethodHandles.lookup();
        lookup = lookup.dropLookupMode(java.lang.invoke.MethodHandles.Lookup.PRIVATE);
        return lookup.defineClass(bcode);
    }
    catch (Throwable t) {
        throw new CannotCompileException(t);
    }
}

方法所在类

java.lang.invoke.MethodHandles.Lookup