LambdaTranslationTest1.java revision 9330:8b1f1c2a400f 
1/*
2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24import java.util.function.Consumer;
25
26import org.testng.annotations.Test;
27
28import static org.testng.Assert.assertEquals;
29
30/**
31 * @author Robert Field
32 */
33
34@Test
35public class LambdaTranslationTest1 extends LT1Sub {
36
37    String cntxt = "blah";
38
39    private static final ThreadLocal<Object> result = new ThreadLocal<>();
40
41    private static void setResult(Object s) { result.set(s); }
42    private static void appendResult(Object s) { result.set(result.get().toString() + s); }
43
44    private static void assertResult(String expected) {
45        assertEquals(result.get().toString(), expected);
46    }
47
48    static Integer count(String s) {
49        return s.length();
50    }
51
52    static int icount(String s) {
53        return s.length();
54    }
55
56    static void eye(Integer i) {
57        setResult(String.format("I:%d", i));
58    }
59
60    static void ieye(int i) {
61        setResult(String.format("i:%d", i));
62    }
63
64    static void deye(double d) {
65        setResult(String.format("d:%f", d));
66    }
67
68    public void testLambdas() {
69        Consumer<Object> b = t -> {setResult("Sink0::" + t);};
70        b.accept("Howdy");
71        assertResult("Sink0::Howdy");
72
73        Consumer<String> b1 = t -> {setResult("Sink1::" + t);};
74        b1.accept("Rowdy");
75        assertResult("Sink1::Rowdy");
76
77        for (int i = 5; i < 10; ++i) {
78            Consumer<Integer> b2 = t -> {setResult("Sink2::" + t);};
79            b2.accept(i);
80            assertResult("Sink2::" + i);
81        }
82
83        Consumer<Integer> b3 = t -> {setResult("Sink3::" + t);};
84        for (int i = 900; i > 0; i -= 100) {
85            b3.accept(i);
86            assertResult("Sink3::" + i);
87        }
88
89        cntxt = "blah";
90        Consumer<String> b4 = t -> {setResult(String.format("b4: %s .. %s", cntxt, t));};
91        b4.accept("Yor");
92        assertResult("b4: blah .. Yor");
93
94        String flaw = "flaw";
95        Consumer<String> b5 = t -> {setResult(String.format("b5: %s .. %s", flaw, t));};
96        b5.accept("BB");
97        assertResult("b5: flaw .. BB");
98
99        cntxt = "flew";
100        Consumer<String> b6 = t -> {setResult(String.format("b6: %s .. %s .. %s", t, cntxt, flaw));};
101        b6.accept("flee");
102        assertResult("b6: flee .. flew .. flaw");
103
104        Consumer<String> b7 = t -> {setResult(String.format("b7: %s %s", t, this.protectedSuperclassMethod()));};
105        b7.accept("this:");
106        assertResult("b7: this: instance:flew");
107
108        Consumer<String> b8 = t -> {setResult(String.format("b8: %s %s", t, super.protectedSuperclassMethod()));};
109        b8.accept("super:");
110        assertResult("b8: super: I'm the sub");
111
112        Consumer<String> b7b = t -> {setResult(String.format("b9: %s %s", t, protectedSuperclassMethod()));};
113        b7b.accept("implicit this:");
114        assertResult("b9: implicit this: instance:flew");
115
116        Consumer<Object> b10 = t -> {setResult(String.format("b10: new LT1Thing: %s", (new LT1Thing(t)).str));};
117        b10.accept("thing");
118        assertResult("b10: new LT1Thing: thing");
119
120        Consumer<Object> b11 = t -> {setResult(String.format("b11: %s", (new LT1Thing(t) {
121            String get() {
122                return "*" + str.toString() + "*";
123            }
124        }).get()));};
125        b11.accept(999);
126        assertResult("b11: *999*");
127    }
128
129    public void testMethodRefs() {
130        LT1IA ia = LambdaTranslationTest1::eye;
131        ia.doit(1234);
132        assertResult("I:1234");
133
134        LT1IIA iia = LambdaTranslationTest1::ieye;
135        iia.doit(1234);
136        assertResult("i:1234");
137
138        LT1IA da = LambdaTranslationTest1::deye;
139        da.doit(1234);
140        assertResult("d:1234.000000");
141
142        LT1SA a = LambdaTranslationTest1::count;
143        assertEquals((Integer) 5, a.doit("howdy"));
144
145        a = LambdaTranslationTest1::icount;
146        assertEquals((Integer) 6, a.doit("shower"));
147    }
148
149    public void testInner() throws Exception {
150        (new In()).doInner();
151    }
152
153    protected String protectedSuperclassMethod() {
154        return "instance:" + cntxt;
155    }
156
157    private class In {
158
159        private int that = 1234;
160
161        void doInner() {
162            Consumer<String> i4 = t -> {setResult(String.format("i4: %d .. %s", that, t));};
163            i4.accept("=1234");
164            assertResult("i4: 1234 .. =1234");
165
166            Consumer<String> i5 = t -> {setResult(""); appendResult(t); appendResult(t);};
167            i5.accept("fruit");
168            assertResult("fruitfruit");
169
170            cntxt = "human";
171            Consumer<String> b4 = t -> {setResult(String.format("b4: %s .. %s", cntxt, t));};
172            b4.accept("bin");
173            assertResult("b4: human .. bin");
174
175            final String flaw = "flaw";
176
177/**
178 Callable<String> c5 = () ->  "["+flaw+"]" ;
179 System.out.printf("c5: %s\n", c5.call() );
180 **/
181
182            Consumer<String> b5 = t -> {setResult(String.format("b5: %s .. %s", flaw, t));};
183            b5.accept("BB");
184            assertResult("b5: flaw .. BB");
185
186            cntxt = "borg";
187            Consumer<String> b6 = t -> {setResult(String.format("b6: %s .. %s .. %s", t, cntxt, flaw));};
188            b6.accept("flee");
189            assertResult("b6: flee .. borg .. flaw");
190
191            Consumer<String> b7b = t -> {setResult(String.format("b7b: %s %s", t, protectedSuperclassMethod()));};
192            b7b.accept("implicit outer this");
193            assertResult("b7b: implicit outer this instance:borg");
194
195            /**
196             Block<Object> b9 = t -> { System.out.printf("New: %s\n", (new LT1Thing(t)).str); };
197             b9.apply("thing");
198
199             Block<Object> ba = t -> { System.out.printf("Def: %s\n", (new LT1Thing(t) { String get() { return "*" + str.toString() +"*";}}).get() ); };
200             ba.apply(999);
201
202             */
203        }
204    }
205}
206
207class LT1Sub {
208    protected String protectedSuperclassMethod() {
209        return "I'm the sub";
210    }
211}
212
213class LT1Thing {
214    final Object str;
215
216    LT1Thing(Object s) {
217        str = s;
218    }
219}
220
221interface LT1SA {
222    Integer doit(String s);
223}
224
225interface LT1IA {
226    void doit(int i);
227}
228
229interface LT1IIA {
230    void doit(Integer i);
231}
232
233