test/langtools/tools/javac/ConditionalExpressionResolvePending.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8234899
 * @summary Verify behavior w.r.t. preview feature API errors and warnings
 * @library /tools/lib /tools/javac/lib
 * @modules
 *      java.base/jdk.internal
 *      jdk.compiler/com.sun.tools.javac.api
 *      jdk.compiler/com.sun.tools.javac.file
 *      jdk.compiler/com.sun.tools.javac.main
 *      jdk.compiler/com.sun.tools.javac.util
 * @build toolbox.ToolBox toolbox.JavacTask
 * @build combo.ComboTestHelper
 * @compile ConditionalExpressionResolvePending.java
 * @run main/othervm ConditionalExpressionResolvePending
 */

import combo.ComboInstance;
import combo.ComboParameter;
import combo.ComboTask;
import combo.ComboTestHelper;
import java.io.InputStream;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Iterator;
import java.util.Objects;
import java.util.function.BiPredicate;
import toolbox.ToolBox;

import javax.tools.JavaFileObject;

public class ConditionalExpressionResolvePending extends ComboInstance<ConditionalExpressionResolvePending> {
    protected ToolBox tb;

    ConditionalExpressionResolvePending() {
        super();
        tb = new ToolBox();
    }

    public static void main(String... args) throws Exception {
        new ComboTestHelper<ConditionalExpressionResolvePending>()
                .withDimension("METHOD", (x, method) -> x.method = method, Method.values())
                .withDimension("EXPRESSION", (x, expression) -> x.expression = expression, Expression.values())
                .withDimension("TRUE", (x, True) -> x.True = True, TestOrDummy.values())
                .withDimension("FALSE", (x, False) -> x.False = False, TestOrDummy.values())
                .withDimension("SNIPPET", (x, snippet) -> x.snippet = snippet, Snippet.values())
                .run(ConditionalExpressionResolvePending::new);
    }

    private Method method;
    private Expression expression;
    private TestOrDummy True;
    private TestOrDummy False;
    private Snippet snippet;

    private static final String MAIN_TEMPLATE =
            """
            public class Test {
                public static boolean doTest(boolean c, Object input) {
                    String clazzName = input.getClass().getName();
                    int len = clazzName.length();
                    #{METHOD}
                }
            }
            """;

    @Override
    protected void doWork() throws Throwable {
        Path base = Paths.get(".");

        ComboTask task = newCompilationTask()
                .withSourceFromTemplate(MAIN_TEMPLATE, pname -> switch (pname) {
                        case "METHOD" -> method;
                        case "EXPRESSION" -> expression;
                        case "TRUE" -> True;
                        case "FALSE" -> False;
                        case "SNIPPET" -> snippet;
                        default -> throw new UnsupportedOperationException(pname);
                    });

        task.generate(result -> {
            try {
                Iterator<? extends JavaFileObject> filesIt = result.get().iterator();
                JavaFileObject file = filesIt.next();
                if (filesIt.hasNext()) {
                    throw new IllegalStateException("More than one classfile returned!");
                }
                byte[] data;
                try (InputStream input = file.openInputStream()) {
                    data = input.readAllBytes();
                }
                ClassLoader inMemoryLoader = new ClassLoader() {
                    protected Class<?> findClass(String name) throws ClassNotFoundException {
                        if ("Test".equals(name)) {
                            return defineClass(name, data, 0, data.length);
                        }
                        return super.findClass(name);
                    }
                };
                Class<?> test = Class.forName("Test", false, inMemoryLoader);
                java.lang.reflect.Method doTest = test.getDeclaredMethod("doTest", boolean.class, Object.class);
                runTest((c, input) -> {
                    try {
                        return (boolean) doTest.invoke(null, c, input);
                    } catch (Exception ex) {
                        throw new IllegalStateException(ex);
                    }
                });
            } catch (Throwable ex) {
                throw new IllegalStateException(ex);
            }
        });
    }

    private void runTest(BiPredicate<Boolean, Object> test) {
        assertEquals(false, test.test(true, ""));
        assertEquals(true, test.test(true, 1));
        assertEquals(false, test.test(false, ""));
        assertEquals(true, test.test(false, 1));
    }

    private void assertEquals(Object o1, Object o2) {
        if (!Objects.equals(o1, o2)) {
            throw new AssertionError();
        }
    }

    public enum Method implements ComboParameter {
        VARIABLE("""
                 boolean b = #{EXPRESSION};
                 return b;
                 """),
        IF("""
           boolean b;
           if (#{EXPRESSION}) b = true;
           else b = false;
           return b;
           """),
        RETURN("""
               return #{EXPRESSION};
               """);
        private final String body;

        private Method(String body) {
            this.body = body;
        }

        @Override
        public String expand(String optParameter) {
            return body;
        }

    }
    public enum Expression implements ComboParameter {
        CONDITIONAL("c ? #{TRUE} : #{FALSE}"),
        AND("(c && #{TRUE}) || (!c && #{FALSE})");
        private final String expression;

        private Expression(String expression) {
            this.expression = expression;
        }

        @Override
        public String expand(String optParameter) {
            return expression;
        }
    }
    public enum TestOrDummy implements ComboParameter {
        TEST("!(#{SNIPPET})"),
        DUMMY("input.getClass() == Integer.class");
        private final String code;
        private TestOrDummy(String code) {
            this.code = code;
        }
        @Override
        public String expand(String optParameter) {
            return code;
        }
    }
    public enum Snippet implements ComboParameter {
        PATTERN("input instanceof String sX"),
        SWITCH_EXPRESSION("switch (len) { case 16 -> {boolean r = true; yield r; } default -> {boolean r = false; yield r; } }"),
        SWITCH_EXPRESSION_STRING("switch (clazzName) { case \"java.lang.String\"-> {boolean r = true; yield r; } default -> {boolean r = false; yield r; } }");
        private static int idx;
        private final String snippet;

        private Snippet(String snippet) {
            this.snippet = snippet;
        }

        @Override
        public String expand(String optParameter) {
            return snippet.replace("sX", "s" + idx++);
        }

    }
}