--- /dev/null 2016-03-02 13:44:01.000000000 +0100 +++ new/test/java/lang/invoke/SpreadCollectTest.java 2016-03-02 13:44:01.000000000 +0100 @@ -0,0 +1,240 @@ +/* + * 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 + 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); + } + } + + } + +}