/* * Copyright (c) 2015, 2016, 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 * @bug 8139885 * @bug 8143798 * @run testng/othervm -ea -esa test.java.lang.invoke.SpreadCollectTest */ package test.java.lang.invoke; import java.io.StringWriter; import java.lang.invoke.MethodHandle; import java.lang.invoke.MethodHandles; import java.lang.invoke.MethodHandles.Lookup; import java.lang.invoke.MethodType; import java.lang.invoke.WrongMethodTypeException; import java.util.*; import static java.lang.invoke.MethodType.methodType; import static org.testng.AssertJUnit.*; import org.testng.annotations.*; /** * Tests for the new asSpreader/asCollector API added in JEP 274. */ public class SpreadCollectTest { static final Lookup LOOKUP = MethodHandles.lookup(); @Test public static void testAsSpreader() throws Throwable { MethodHandle spreader = SpreadCollect.MH_forSpreading.asSpreader(1, int[].class, 3); assertEquals(SpreadCollect.MT_spreader, spreader.type()); assertEquals("A456B", (String) spreader.invoke("A", new int[]{4, 5, 6}, "B")); } @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 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); } @DataProvider static Object[][] asSpreaderIllegalPositions() { return new Object[][]{{-7}, {3}, {19}}; } @Test(dataProvider = "asSpreaderIllegalPositions") public static void testAsSpreaderIllegalPos(int p) throws Throwable { boolean caught = false; try { SpreadCollect.MH_forSpreading.asSpreader(p, Object[].class, 3); } catch (IllegalArgumentException iae) { assertEquals("bad spread position", iae.getMessage()); caught = true; } assertTrue(caught); } @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); } @Test(expectedExceptions = {NullPointerException.class}) public static void testAsSpreaderNullArrayType() { SpreadCollect.MH_forSpreading.asSpreader(null, 0); } @Test(expectedExceptions = {NullPointerException.class}) public static void testAsSpreaderNullArrayNonZeroLength() { SpreadCollect.MH_forSpreading.asSpreader(null, 1); } @Test(expectedExceptions = {IllegalArgumentException.class}) public static void testAsSpreaderTooManyParams() throws Throwable { SpreadCollect.MH_forSpreading.asSpreader(1, int[].class, 6); } @Test public static void testAsCollector() throws Throwable { MethodHandle collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 1); assertEquals(SpreadCollect.MT_collector1, collector.type()); assertEquals("A4B", (String) collector.invoke("A", 4, "B")); collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 2); assertEquals(SpreadCollect.MT_collector2, collector.type()); assertEquals("A45B", (String) collector.invoke("A", 4, 5, "B")); collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 3); assertEquals(SpreadCollect.MT_collector3, collector.type()); assertEquals("A456B", (String) collector.invoke("A", 4, 5, 6, "B")); } @Test public static void testAsCollectorInvokeWithArguments() throws Throwable { MethodHandle collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 1); assertEquals(SpreadCollect.MT_collector1, collector.type()); assertEquals("A4B", (String) collector.invokeWithArguments("A", 4, "B")); collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 2); assertEquals(SpreadCollect.MT_collector2, collector.type()); assertEquals("A45B", (String) collector.invokeWithArguments("A", 4, 5, "B")); collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 3); assertEquals(SpreadCollect.MT_collector3, collector.type()); assertEquals("A456B", (String) collector.invokeWithArguments("A", 4, 5, 6, "B")); } @Test public static void testAsCollectorLeading() throws Throwable { MethodHandle collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 1); assertEquals(SpreadCollect.MT_collectorLeading1, collector.type()); assertEquals("7Q", (String) collector.invoke(7, "Q")); collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 2); assertEquals(SpreadCollect.MT_collectorLeading2, collector.type()); assertEquals("78Q", (String) collector.invoke(7, 8, "Q")); collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 3); assertEquals(SpreadCollect.MT_collectorLeading3, collector.type()); assertEquals("789Q", (String) collector.invoke(7, 8, 9, "Q")); } @Test public static void testAsCollectorLeadingInvokeWithArguments() throws Throwable { MethodHandle collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 1); assertEquals(SpreadCollect.MT_collectorLeading1, collector.type()); assertEquals("7Q", (String) collector.invokeWithArguments(7, "Q")); collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 2); assertEquals(SpreadCollect.MT_collectorLeading2, collector.type()); assertEquals("78Q", (String) collector.invokeWithArguments(7, 8, "Q")); collector = SpreadCollect.MH_forCollectingLeading.asCollector(0, int[].class, 3); assertEquals(SpreadCollect.MT_collectorLeading3, collector.type()); assertEquals("789Q", (String) collector.invokeWithArguments(7, 8, 9, "Q")); } @Test public static void testAsCollectorNone() throws Throwable { MethodHandle collector = SpreadCollect.MH_forCollecting.asCollector(1, int[].class, 0); assertEquals(SpreadCollect.MT_collector0, collector.type()); assertEquals("AB", (String) collector.invoke("A", "B")); } @DataProvider static Object[][] asCollectorIllegalPositions() { return new Object[][]{{-1}, {17}}; } @Test(dataProvider = "asCollectorIllegalPositions") public static void testAsCollectorIllegalPos(int p) { boolean caught = false; try { SpreadCollect.MH_forCollecting.asCollector(p, int[].class, 0); } catch (IllegalArgumentException iae) { assertEquals("bad collect position", iae.getMessage()); caught = true; } assertTrue(caught); } @Test public static void testAsCollectorExample() throws Throwable { // test the JavaDoc asCollector-with-pos example StringWriter swr = new StringWriter(); MethodHandle swWrite = LOOKUP. findVirtual(StringWriter.class, "write", methodType(void.class, char[].class, int.class, int.class)). bindTo(swr); MethodHandle swWrite4 = swWrite.asCollector(0, char[].class, 4); swWrite4.invoke('A', 'B', 'C', 'D', 1, 2); assertEquals("BC", swr.toString()); swWrite4.invoke('P', 'Q', 'R', 'S', 0, 4); assertEquals("BCPQRS", swr.toString()); swWrite4.invoke('W', 'X', 'Y', 'Z', 3, 1); assertEquals("BCPQRSZ", swr.toString()); } static class SpreadCollect { static String forSpreading(String s1, int i1, int i2, int i3, String s2) { return s1 + i1 + i2 + i3 + s2; } static String forCollecting(String s1, int[] is, String s2) { StringBuilder sb = new StringBuilder(s1); for (int i : is) { sb.append(i); } return sb.append(s2).toString(); } static String forCollectingLeading(int[] is, String s) { return forCollecting("", is, s); } static final Class SPREAD_COLLECT = SpreadCollect.class; static final MethodType MT_forSpreading = methodType(String.class, String.class, int.class, int.class, int.class, String.class); static final MethodType MT_forCollecting = methodType(String.class, String.class, int[].class, String.class); static final MethodType MT_forCollectingLeading = methodType(String.class, int[].class, String.class); static final MethodHandle MH_forSpreading; static final MethodHandle MH_forCollecting; static final MethodHandle MH_forCollectingLeading; static final MethodType MT_spreader = methodType(String.class, String.class, int[].class, String.class); static final MethodType MT_collector0 = methodType(String.class, String.class, String.class); static final MethodType MT_collector1 = methodType(String.class, String.class, int.class, String.class); static final MethodType MT_collector2 = methodType(String.class, String.class, int.class, int.class, String.class); static final MethodType MT_collector3 = methodType(String.class, String.class, int.class, int.class, int.class, String.class); static final MethodType MT_collectorLeading1 = methodType(String.class, int.class, String.class); static final MethodType MT_collectorLeading2 = methodType(String.class, int.class, int.class, String.class); static final MethodType MT_collectorLeading3 = methodType(String.class, int.class, int.class, int.class, String.class); static final String NONE_ERROR = "zero array length in MethodHandle.asCollector"; static { try { MH_forSpreading = LOOKUP.findStatic(SPREAD_COLLECT, "forSpreading", MT_forSpreading); MH_forCollecting = LOOKUP.findStatic(SPREAD_COLLECT, "forCollecting", MT_forCollecting); MH_forCollectingLeading = LOOKUP.findStatic(SPREAD_COLLECT, "forCollectingLeading", MT_forCollectingLeading); } catch (Exception e) { throw new ExceptionInInitializerError(e); } } } }