/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* 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.lang.invoke API
* @compile JavaDocExamplesTest.java
* @run junit/othervm test.java.lang.invoke.JavaDocExamplesTest
*/
/*
---- To run outside jtreg:
$ $JAVA7X_HOME/bin/javac -cp $JUNIT4_JAR -d /tmp/Classes \
$ $JAVA7X_HOME/bin/java -cp $JUNIT4_JAR:/tmp/Classes \
-DJavaDocExamplesTest.verbosity=1 \
test.java.lang.invoke.JavaDocExamplesTest
----
*/
/**
* @author jrose
*/
public class JavaDocExamplesTest {
/** Wrapper for running the JUnit tests in this module.
* Put JUnit on the classpath!
*/
new JavaDocExamplesTest().run();
}
}
// How much output?
{}
// 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 ReflectiveOperationException is intercepted:
static {
try {
"hashCode", methodType(int.class));
} catch (ReflectiveOperationException ex) {
throw new RuntimeException(ex);
}
}
static int add(int x, int y) { return x + y; }
static int sub(int x, int y) { return x - y; }
{}
{}
"hashCode", methodType(int.class));
//assertEquals("xy", (String) CONCAT_1.invokeExact("x", "y"));
//assertEquals("xy".hashCode(), (int) HASHCODE_1.invokeExact((Object)"xy"));
{}
}
{{
{} /// JAVADOC
}}
{{
{} /// JAVADOC
}}
}
{{
{} /// JAVADOC
}}
{{
{} /// JAVADOC
}}
}
{{
{} /// JAVADOC
}}
}
{{
{} /// JAVADOC
// also prints "boo":
}}
}
if (verbosity > 0)
}
{{
{} /// JAVADOC
// mt is (char,char)String
assertEquals(s, "nanny");
// weakly typed invocation (using MHs.invoke)
assertEquals(s, "savvy");
// mt is (Object[])List
assert(mh.isVarargsCollector());
// mt is (Object,Object,Object)Object
// mt is ()int
assert(i == 3);
{}
}}
}
{{
{} /// JAVADOC
// spread both arguments from a 2-array:
// spread both arguments from a String array:
// spread second arguments from a 1-array:
// spread no arguments from a 0-array or null:
// asSpreader and asCollector are approximate inverses:
for (int n = 0; n <= 2; n++) {
}
}
}}
}
{{
{} /// JAVADOC
//assertEquals("[won]", (String) ts1.invokeExact( new Object[]{"won"})); //FAIL
// arrayType can be a subtype of Object[]
// collectors can be nested, Lisp-style
// arrayType can be any primitive array type
.asCollector(byte[].class, 3);
.asCollector(long[].class, 1);
}}
}
@SuppressWarnings("rawtypes")
{{
{} /// JAVADOC
// findStatic of Arrays.asList(...) produces a variable arity method handle:
assert(asList.isVarargsCollector());
}}
}
{{
{} /// JAVADOC
.asVarargsCollector(Object[].class);
assert(caught instanceof ClassCastException);
assert(caught instanceof WrongMethodTypeException);
}}
}
{{
{} /// JAVADOC
assert(caught instanceof WrongMethodTypeException);
assert(caught instanceof WrongMethodTypeException);
assert(caught instanceof ClassCastException);
assert(caught instanceof ClassCastException);
{}
}}
}
{{
{} /// JAVADOC
// (mutation can be continued indefinitely)
/*
* </pre></blockquote>
* <p>
* The same call site may be used in several places at once.
* <blockquote><pre>
*/
{}
}}
}
{{
{} /// JAVADOC
assert(!spt.hasBeenInvalidated());
// the following steps may be repeated to re-use the same switch point:
assert(spt.hasBeenInvalidated());
{}
}}
}
{{
{} /// JAVADOC
// argument-based dispatch for methods of the form boolean x.___(y: String)
// first, a tracing hack:
MethodHandle println = lookup.findVirtual(java.io.PrintStream.class, "println", methodType(void.class, String.class));
MethodHandle arrayToString = lookup.findStatic(Arrays.class, "toString", methodType(String.class, Object[].class));
MethodHandle concat = lookup.findVirtual(String.class, "concat", methodType(String.class, String.class));
MethodHandle printArgs_DIS = filterReturnValue(arrayToString_DIS, println.bindTo(System.out)).asVarargsCollector(Object[].class);
MethodHandle printArgs_INV = filterReturnValue(arrayToString_INV, println.bindTo(System.out)).asVarargsCollector(Object[].class);
// metaobject protocol:
// wrap tracing around the dispatch and invoke steps:
dispatch = foldArguments(dispatch, printArgs_DIS.asType(dispatch.type().changeReturnType(void.class)));
invoker = foldArguments(invoker, printArgs_INV.asType(invoker.type().changeReturnType(void.class)));
// compose the dispatcher and the invoker:
}}
}
/* ---- TEMPLATE ----
@Test public void testFoo() throws Throwable {
{{
{} /// JAVADOC
{}
}}
}
*/
}