jdk-24/jdk/test/java/dyn/JavaDocExamplesTest.java
2010-12-16 15:59:27 -08:00

179 lines
6.7 KiB
Java

/*
* Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @summary example code used in javadoc for java.dyn API
* @compile -XDallowTransitionalJSR292=no JavaDocExamplesTest.java
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles test.java.dyn.JavaDocExamplesTest
*/
/*
---- To run outside jtreg:
$ $JAVA7X_HOME/bin/javac -cp $JUNIT4_JAR -d /tmp/Classes \
$DAVINCI/sources/jdk/test/java/dyn/JavaDocExamplesTest.java
$ $JAVA7X_HOME/bin/java -cp $JUNIT4_JAR:/tmp/Classes \
-XX:+UnlockExperimentalVMOptions -XX:+EnableMethodHandles \
-Dtest.java.dyn.JavaDocExamplesTest.verbosity=1 \
test.java.dyn.JavaDocExamplesTest
----
*/
package test.java.dyn;
import java.dyn.*;
import static java.dyn.MethodHandles.*;
import static java.dyn.MethodType.*;
import java.lang.reflect.*;
import java.util.*;
import org.junit.*;
import static org.junit.Assert.*;
import static org.junit.Assume.*;
/**
* @author jrose
*/
public class JavaDocExamplesTest {
/** Wrapper for running the JUnit tests in this module.
* Put JUnit on the classpath!
*/
public static void main(String... ignore) {
org.junit.runner.JUnitCore.runClasses(JavaDocExamplesTest.class);
}
// How much output?
static int verbosity = Integer.getInteger("test.java.dyn.JavaDocExamplesTest.verbosity", 0);
{}
static final private Lookup LOOKUP = lookup();
// static final private MethodHandle CONCAT_1 = LOOKUP.findVirtual(String.class,
// "concat", methodType(String.class, String.class));
// static final private MethodHandle HASHCODE_1 = LOOKUP.findVirtual(Object.class,
// "hashCode", methodType(int.class));
// form required if NoAccessException is intercepted:
static final private MethodHandle CONCAT_2, HASHCODE_2;
static {
try {
CONCAT_2 = LOOKUP.findVirtual(String.class,
"concat", methodType(String.class, String.class));
HASHCODE_2 = LOOKUP.findVirtual(Object.class,
"hashCode", methodType(int.class));
} catch (NoAccessException ex) {
throw new RuntimeException(ex);
}
}
{}
@Test public void testFindVirtual() throws Throwable {
{}
MethodHandle CONCAT_3 = LOOKUP.findVirtual(String.class,
"concat", methodType(String.class, String.class));
MethodHandle HASHCODE_3 = LOOKUP.findVirtual(Object.class,
"hashCode", methodType(int.class));
//assertEquals("xy", (String) CONCAT_1.invokeExact("x", "y"));
assertEquals("xy", (String) CONCAT_2.invokeExact("x", "y"));
assertEquals("xy", (String) CONCAT_3.invokeExact("x", "y"));
//assertEquals("xy".hashCode(), (int) HASHCODE_1.invokeExact((Object)"xy"));
assertEquals("xy".hashCode(), (int) HASHCODE_2.invokeExact((Object)"xy"));
assertEquals("xy".hashCode(), (int) HASHCODE_3.invokeExact((Object)"xy"));
{}
}
@Test public void testDropArguments() throws Throwable {
{{
{} /// JAVADOC
MethodHandle cat = lookup().findVirtual(String.class,
"concat", methodType(String.class, String.class));
assertEquals("xy", (String) cat.invokeExact("x", "y"));
MethodHandle d0 = dropArguments(cat, 0, String.class);
assertEquals("yz", (String) d0.invokeExact("x", "y", "z"));
MethodHandle d1 = dropArguments(cat, 1, String.class);
assertEquals("xz", (String) d1.invokeExact("x", "y", "z"));
MethodHandle d2 = dropArguments(cat, 2, String.class);
assertEquals("xy", (String) d2.invokeExact("x", "y", "z"));
MethodHandle d12 = dropArguments(cat, 1, int.class, boolean.class);
assertEquals("xz", (String) d12.invokeExact("x", 12, true, "z"));
}}
}
@Test public void testFilterArguments() throws Throwable {
{{
{} /// JAVADOC
MethodHandle cat = lookup().findVirtual(String.class,
"concat", methodType(String.class, String.class));
MethodHandle upcase = lookup().findVirtual(String.class,
"toUpperCase", methodType(String.class));
assertEquals("xy", (String) cat.invokeExact("x", "y"));
MethodHandle f0 = filterArguments(cat, 0, upcase);
assertEquals("Xy", (String) f0.invokeExact("x", "y")); // Xy
MethodHandle f1 = filterArguments(cat, 1, upcase);
assertEquals("xY", (String) f1.invokeExact("x", "y")); // xY
MethodHandle f2 = filterArguments(cat, 0, upcase, upcase);
assertEquals("XY", (String) f2.invokeExact("x", "y")); // XY
}}
}
static void assertEquals(Object exp, Object act) {
if (verbosity > 0)
System.out.println("result: "+act);
Assert.assertEquals(exp, act);
}
static MethodHandle asList;
@Test public void testWithTypeHandler() throws Throwable {
{{
{} /// JAVADOC
MethodHandle makeEmptyList = MethodHandles.constant(List.class, Arrays.asList());
MethodHandle asList = lookup()
.findStatic(Arrays.class, "asList", methodType(List.class, Object[].class));
JavaDocExamplesTest.asList = asList;
/*
static MethodHandle collectingTypeHandler(MethodHandle base, MethodType newType) {
return asList.asCollector(Object[].class, newType.parameterCount()).asType(newType);
}
*/
MethodHandle collectingTypeHandler = lookup()
.findStatic(lookup().lookupClass(), "collectingTypeHandler",
methodType(MethodHandle.class, MethodHandle.class, MethodType.class));
MethodHandle makeAnyList = makeEmptyList.withTypeHandler(collectingTypeHandler);
assertEquals("[]", makeAnyList.invokeGeneric().toString());
assertEquals("[1]", makeAnyList.invokeGeneric(1).toString());
assertEquals("[two, too]", makeAnyList.invokeGeneric("two", "too").toString());
}}
}
static MethodHandle collectingTypeHandler(MethodHandle base, MethodType newType) {
//System.out.println("Converting "+asList+" to "+newType);
MethodHandle conv = asList.asCollector(Object[].class, newType.parameterCount()).asType(newType);
//System.out.println(" =>"+conv);
return conv;
}
}