/*

 * Copyright (c) 2015, 2018, 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.

 *

 * 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 8144903 8177466 8191842

 * @summary Tests for EvaluationState.variables

 * @library /tools/lib

 * @build Compiler KullaTesting TestingInputStream ExpectedDiagnostic

 * @run testng VariablesTest

 */

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.List;

import javax.tools.Diagnostic;

import jdk.jshell.Snippet;

import jdk.jshell.TypeDeclSnippet;

import jdk.jshell.VarSnippet;

import jdk.jshell.Snippet.SubKind;

import jdk.jshell.SnippetEvent;

import org.testng.annotations.BeforeMethod;

import org.testng.annotations.Test;

import static java.util.stream.Collectors.toList;

import static jdk.jshell.Snippet.Status.*;

import static jdk.jshell.Snippet.SubKind.VAR_DECLARATION_SUBKIND;

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.fail;

@Test

public class VariablesTest extends KullaTesting {

    public void noVariables() {

        assertNumberOfActiveVariables(0);

    }

    private void badVarValue(VarSnippet key) {

        try {

            getState().varValue(key);

            fail("Expected exception for: " + key.source());

        } catch (IllegalArgumentException e) {

            // ok

        }

    }

    public void testVarValue1() {

        VarSnippet v1 = varKey(assertEval("und1 a;", added(RECOVERABLE_NOT_DEFINED)));

        badVarValue(v1);

        VarSnippet v2 = varKey(assertEval("und2 a;",

                ste(MAIN_SNIPPET, RECOVERABLE_NOT_DEFINED, RECOVERABLE_NOT_DEFINED, false, null),

                ste(v1, RECOVERABLE_NOT_DEFINED, OVERWRITTEN, false, MAIN_SNIPPET)));

        badVarValue(v2);

        TypeDeclSnippet und = classKey(assertEval("class und2 {}",

                added(VALID),

                ste(v2, RECOVERABLE_NOT_DEFINED, VALID, true, MAIN_SNIPPET)));

        assertVarValue(v2, "null");

        assertDrop(und,

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                ste(und, VALID, DROPPED, true, null),

                ste(v2, VALID, RECOVERABLE_NOT_DEFINED, true, und));

        badVarValue(v1);

        badVarValue(v2);

    }

    public void testVarValue2() {

        VarSnippet v1 = (VarSnippet) assertDeclareFail("int a = 0.0;", "compiler.err.prob.found.req");

        badVarValue(v1);

        VarSnippet v2 = varKey(assertEval("int a = 0;", added(VALID)));

        assertDrop(v2, ste(MAIN_SNIPPET, VALID, DROPPED, true, null));

        badVarValue(v2);

    }

    public void testSignature1() {

        VarSnippet v1 = varKey(assertEval("und1 a;", added(RECOVERABLE_NOT_DEFINED)));

        assertVariableDeclSnippet(v1, "a", "und1", RECOVERABLE_NOT_DEFINED, VAR_DECLARATION_SUBKIND, 1, 0);

        VarSnippet v2 = varKey(assertEval("und2 a;",

                ste(MAIN_SNIPPET, RECOVERABLE_NOT_DEFINED, RECOVERABLE_NOT_DEFINED, false, null),

                ste(v1, RECOVERABLE_NOT_DEFINED, OVERWRITTEN, false, MAIN_SNIPPET)));

        assertVariableDeclSnippet(v2, "a", "und2", RECOVERABLE_NOT_DEFINED, VAR_DECLARATION_SUBKIND, 1, 0);

        TypeDeclSnippet und = classKey(assertEval("class und2 {}",

                added(VALID),

                ste(v2, RECOVERABLE_NOT_DEFINED, VALID, true, MAIN_SNIPPET)));

        assertVariableDeclSnippet(v2, "a", "und2", VALID, VAR_DECLARATION_SUBKIND, 0, 0);

        assertDrop(und,

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                ste(und, VALID, DROPPED, true, null),

                ste(v2, VALID, RECOVERABLE_NOT_DEFINED, true, und));

        assertVariableDeclSnippet(v2, "a", "und2", RECOVERABLE_NOT_DEFINED, VAR_DECLARATION_SUBKIND, 1, 0);

    }

    public void testSignature2() {

        VarSnippet v1 = (VarSnippet) assertDeclareFail("int a = 0.0;", "compiler.err.prob.found.req");

        assertVariableDeclSnippet(v1, "a", "int", REJECTED, SubKind.VAR_DECLARATION_WITH_INITIALIZER_SUBKIND, 0, 1);

        VarSnippet v2 = varKey(assertEval("int a = 0;",

                added(VALID)));

        assertVariableDeclSnippet(v2, "a", "int", VALID, SubKind.VAR_DECLARATION_WITH_INITIALIZER_SUBKIND, 0, 0);

        assertDrop(v2, ste(MAIN_SNIPPET, VALID, DROPPED, true, null));

        assertVariableDeclSnippet(v2, "a", "int", DROPPED, SubKind.VAR_DECLARATION_WITH_INITIALIZER_SUBKIND, 0, 0);

    }

    public void variables() {

        VarSnippet snx = varKey(assertEval("int x = 10;"));

        VarSnippet sny = varKey(assertEval("String y = \"hi\";"));

        VarSnippet snz = varKey(assertEval("long z;"));

        assertVariables(variable("int", "x"), variable("String", "y"), variable("long", "z"));

        assertVarValue(snx, "10");

        assertVarValue(sny, "\"hi\"");

        assertVarValue(snz, "0");

        assertActiveKeys();

    }

    public void variablesArray() {

        VarSnippet sn = varKey(assertEval("int[] a = new int[12];"));

        assertEquals(sn.typeName(), "int[]");

        assertEval("int len = a.length;", "12");

        assertVariables(variable("int[]", "a"), variable("int", "len"));

        assertActiveKeys();

    }

    public void variablesArrayOld() {

        VarSnippet sn = varKey(assertEval("int a[] = new int[12];"));

        assertEquals(sn.typeName(), "int[]");

        assertEval("int len = a.length;", "12");

        assertVariables(variable("int[]", "a"), variable("int", "len"));

        assertActiveKeys();

    }

    public void variablesRedefinition() {

        Snippet x = varKey(assertEval("int x = 10;"));

        Snippet y = varKey(assertEval("String y = \"\";", added(VALID)));

        assertVariables(variable("int", "x"), variable("String", "y"));

        assertActiveKeys();

        assertEval("long x;",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(x, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertVariables(variable("long", "x"), variable("String", "y"));

        assertActiveKeys();

        assertEval("String y;",

                ste(MAIN_SNIPPET, VALID, VALID, false, null),

                ste(y, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertVariables(variable("long", "x"), variable("String", "y"));

        assertActiveKeys();

    }

    public void variablesTemporary() {

        assertEval("int $1 = 10;", added(VALID));

        assertEval("2 * $1;", added(VALID));

        assertVariables(variable("int", "$1"), variable("int", "$2"));

        assertActiveKeys();

        assertEval("String y;", added(VALID));

        assertVariables(variable("int", "$1"), variable("int", "$2"), variable("String", "y"));

        assertActiveKeys();

    }

    public void variablesTemporaryNull() {

        assertEval("null;", added(VALID));

        assertVariables(variable("Object", "$1"));

        assertEval("(String) null;", added(VALID));

        assertVariables(variable("Object", "$1"), variable("String", "$2"));

        assertActiveKeys();

        assertEval("\"\";", added(VALID));

        assertVariables(

                variable("Object", "$1"),

                variable("String", "$2"),

                variable("String", "$3"));

        assertActiveKeys();

    }

    public void variablesTemporaryArrayOfCapturedType() {

        assertEval("class Test<T> { T[][] get() { return null; } }", added(VALID));

        assertEval("Test<? extends String> test() { return new Test<>(); }", added(VALID));

        assertEval("test().get()", added(VALID));

        assertVariables(variable("String[][]", "$1"));

        assertEval("\"\".getClass().getEnumConstants()", added(VALID));

        assertVariables(variable("String[][]", "$1"), variable("String[]", "$2"));

        assertActiveKeys();

    }

    public void variablesClassReplace() {

        assertEval("import java.util.*;", added(VALID));

        Snippet var = varKey(assertEval("List<Integer> list = new ArrayList<>();", "[]",

                added(VALID)));

        assertVariables(variable("List<Integer>", "list"));

        assertEval("class List {}",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                added(VALID),

                ste(var, VALID, RECOVERABLE_NOT_DEFINED, true, MAIN_SNIPPET));

        assertVariables();

        assertEval("List list = new List();",

                DiagCheck.DIAG_OK, DiagCheck.DIAG_IGNORE,

                ste(MAIN_SNIPPET, RECOVERABLE_NOT_DEFINED, VALID, true, null),

                ste(var, RECOVERABLE_NOT_DEFINED, OVERWRITTEN, false, MAIN_SNIPPET));

        assertVariables(variable("List", "list"));

        assertActiveKeys();

    }

    public void variablesErrors() {

        assertDeclareFail("String;", new ExpectedDiagnostic("compiler.err.cant.resolve.location", 0, 6, 0, -1, -1, Diagnostic.Kind.ERROR));

        assertNumberOfActiveVariables(0);

        assertActiveKeys();

    }

    public void variablesUnresolvedActiveFailed() {

        VarSnippet key = varKey(assertEval("und x;", added(RECOVERABLE_NOT_DEFINED)));

        assertVariableDeclSnippet(key, "x", "und", RECOVERABLE_NOT_DEFINED, VAR_DECLARATION_SUBKIND, 1, 0);

        assertUnresolvedDependencies1(key, RECOVERABLE_NOT_DEFINED, "class und");

        assertNumberOfActiveVariables(1);

        assertActiveKeys();

    }

    public void variablesUnresolvedError() {

        assertDeclareFail("und y = null;", new ExpectedDiagnostic("compiler.err.cant.resolve.location", 0, 3, 0, -1, -1, Diagnostic.Kind.ERROR));

        assertNumberOfActiveVariables(0);

        assertActiveKeys();

    }

    public void variablesMultiByteCharacterType() {

        assertEval("class \u3042 {}");

        assertEval("\u3042 \u3042 = null;", added(VALID));

        assertVariables(variable("\u3042", "\u3042"));

        assertEval("new \u3042()", added(VALID));

        assertVariables(variable("\u3042", "\u3042"), variable("\u3042", "$1"));

        assertEval("class \u3042\u3044\u3046\u3048\u304a {}");

        assertEval("\u3042\u3044\u3046\u3048\u304a \u3042\u3044\u3046\u3048\u304a = null;", added(VALID));

        assertVariables(variable("\u3042", "\u3042"), variable("\u3042", "$1"),

                variable("\u3042\u3044\u3046\u3048\u304a", "\u3042\u3044\u3046\u3048\u304a"));

        assertEval("new \u3042\u3044\u3046\u3048\u304a();");

        assertVariables(variable("\u3042", "\u3042"), variable("\u3042", "$1"),

                variable("\u3042\u3044\u3046\u3048\u304a", "\u3042\u3044\u3046\u3048\u304a"),

                variable("\u3042\u3044\u3046\u3048\u304a", "$2"));

        assertActiveKeys();

    }

    @Test(enabled = false) // TODO 8081689

    public void methodVariablesAreNotVisible() {

        Snippet foo = varKey(assertEval("int foo() {" +

                        "int x = 10;" +

                        "int y = 2 * x;" +

                        "return x * y;" +

                        "}", added(VALID)));

        assertNumberOfActiveVariables(0);

        assertActiveKeys();

        assertEval("int x = 10;", "10");

        assertEval("int foo() {" +

                        "int y = 2 * x;" +

                        "return x * y;" +

                        "}",

                ste(foo, VALID, VALID, false, null));

        assertVariables(variable("int", "x"));

        assertActiveKeys();

        assertEval("foo();", "200");

        assertVariables(variable("int", "x"), variable("int", "$1"));

        assertActiveKeys();

    }

    @Test(enabled = false) // TODO 8081689

    public void classFieldsAreNotVisible() {

        Snippet key = classKey(assertEval("class clazz {" +

                        "int x = 10;" +

                        "int y = 2 * x;" +

                        "}"));

        assertNumberOfActiveVariables(0);

        assertEval("int x = 10;", "10");

        assertActiveKeys();

        assertEval(

                "class clazz {" +

                        "int y = 2 * x;" +

                        "}",

                ste(key, VALID, VALID, true, null));

        assertVariables(variable("int", "x"));

        assertEval("new clazz().y;", "20");

        assertVariables(variable("int", "x"), variable("int", "$1"));

        assertActiveKeys();

    }

    public void multiVariables() {

        List<SnippetEvent> abc = assertEval("int a, b, c = 10;",

                DiagCheck.DIAG_OK, DiagCheck.DIAG_OK,

                chain(added(VALID)),

                chain(added(VALID)),

                chain(added(VALID)));

        Snippet a = abc.get(0).snippet();

        Snippet b = abc.get(1).snippet();

        Snippet c = abc.get(2).snippet();

        assertVariables(variable("int", "a"), variable("int", "b"), variable("int", "c"));

        assertEval("double a = 1.4, b = 8.8;", DiagCheck.DIAG_OK, DiagCheck.DIAG_OK,

                chain(ste(MAIN_SNIPPET, VALID, VALID, true, null), ste(a, VALID, OVERWRITTEN, false, MAIN_SNIPPET)),

                chain(ste(MAIN_SNIPPET, VALID, VALID, true, null), ste(b, VALID, OVERWRITTEN, false, MAIN_SNIPPET)));

        assertVariables(variable("double", "a"), variable("double", "b"), variable("int", "c"));

        assertEval("double c = a + b;",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(c, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertVariables(variable("double", "a"), variable("double", "b"), variable("double", "c"));

        assertActiveKeys();

    }

    public void syntheticVariables() {

        assertEval("assert false;");

        assertNumberOfActiveVariables(0);

        assertActiveKeys();

    }

    public void undefinedReplaceVariable() {

        Snippet key = varKey(assertEval("int d = 234;", "234"));

        assertVariables(variable("int", "d"));

        String src = "undefined d;";

        Snippet undefKey = varKey(assertEval(src,

                ste(MAIN_SNIPPET, VALID, RECOVERABLE_NOT_DEFINED, true, null),

                ste(key, VALID, OVERWRITTEN, false, MAIN_SNIPPET)));

        //assertEquals(getState().source(snippet), src);

        //assertEquals(snippet, undefKey);

        assertEquals(getState().status(undefKey), RECOVERABLE_NOT_DEFINED);

        List<String> unr = getState().unresolvedDependencies((VarSnippet) undefKey).collect(toList());;

        assertEquals(unr.size(), 1);

        assertEquals(unr.get(0), "class undefined");

        assertVariables(variable("undefined", "d"));

    }

    public void lvti() {

        assertEval("var d = 234;", "234");

        assertEval("class Test<T> { T[][] get() { return null; } }", added(VALID));

        assertEval("Test<? extends String> test() { return new Test<>(); }", added(VALID));

        assertEval("var t = test().get();", added(VALID));

        assertEval("<Z extends Runnable & CharSequence> Z get1() { return null; }", added(VALID));

        assertEval("var i1 = get1();", added(VALID));

        assertEval("void t1() { i1.run(); i1.length(); }", added(VALID));

        assertEval("i1 = 1;", DiagCheck.DIAG_ERROR, DiagCheck.DIAG_OK, ste(MAIN_SNIPPET, NONEXISTENT, REJECTED, false, null));

        assertEval("<Z extends Number & CharSequence> Z get2() { return null; }", added(VALID));

        assertEval("var i2 = get2();", added(VALID));

        assertEval("void t2() { i2.length(); }", added(VALID));

        assertEval("var r1 = new Runnable() { public void run() { } public String get() { return \"good\"; } };", added(VALID));

        assertEval("Runnable r2 = r1;");

        assertEval("r1.get()", "\"good\"");

        assertEval("var v = r1.get();", "\"good\"");

        assertEval("var r3 = new java.util.ArrayList<String>(42) { public String get() { return \"good\"; } };", added(VALID));

        assertEval("r3.get()", "\"good\"");

        assertEval("class O { public class Inner { public String test() { return \"good\"; } } }");

        assertEval("var r4 = new O().new Inner() { public String get() { return \"good\"; } };");

        assertEval("r4.get()", "\"good\"");

        assertEval("class O2 { public class Inner { public Inner(int i) { } public String test() { return \"good\"; } } }");

        assertEval("var r5 = new O2().new Inner(1) { public String get() { return \"good\"; } };");

        assertEval("r5.get()", "\"good\"");

        assertEval("<Z> Z identity(Z z) { return z; }");

        assertEval("var r6 = identity(new Object() { String s = \"good\"; });");

        assertEval("r6.s", "\"good\"");

        assertEval("interface I<B, C> { C get(B b); }");

        assertEval("<A, B, C> C cascade(A a, I<A, B> c1, I<B, C> c2) { return c2.get(c1.get(a)); }");

        assertEval("var r7 = cascade(\"good\", a -> new Object() { String s = a; }, b -> new java.util.ArrayList<String>(5) { String s = b.s; });");

        assertEval("r7.s", "\"good\"");

        assertEval("var r8 = cascade(\"good\", a -> new Object() { String s = a; public String getS() { return s; } }, b -> new java.util.ArrayList<String>(5) { String s = b.getS(); public String getS() { return s; } });");

        assertEval("r8.getS()", "\"good\"");

        assertEval("var r9 = new Object() { class T { class Inner { public String g() { return outer(); } } public String outer() { return \"good\"; } public String test() { return new Inner() {}.g(); } } public String test() { return new T().test(); } };");

        assertEval("r9.test()", "\"good\"");

        assertEval("var nested1 = new Object() { class N { public String get() { return \"good\"; } } };");

        assertEval("nested1.new N().get()", "\"good\"");

        assertEval("var nested2 = cascade(\"good\", a -> new Object() { abstract class G { abstract String g(); } G g = new G() { String g() { return a; } }; }, b -> new java.util.ArrayList<String>(5) { String s = b.g.g(); });");

        assertEval("nested2.s", "\"good\"");

        assertEval("<A, B> B convert(A a, I<A, B> c) { return c.get(a); }");

        assertEval("var r10 = convert(\"good\", a -> new api.C(12) { public String val = \"\" + i + s + l + a; } );");

        assertEval("r10.val", "\"12empty[empty]good\"");

        assertEval("var r11 = convert(\"good\", a -> new api.C(\"a\") { public String val = \"\" + i + s + l + a; } );");

        assertEval("r11.val", "\"3a[empty]good\"");

        assertEval("import api.C;");

        assertEval("var r12 = convert(\"good\", a -> new C(java.util.List.of(\"a\")) { public String val = \"\" + i + s + l + a; } );");

        assertEval("r12.val", "\"4empty[a]good\"");

        assertEval("var r13 = convert(\"good\", a -> new api.G<String>(java.util.List.of(\"b\")) { public String val = \"\" + l + a; } );");

        assertEval("r13.val", "\"[b]good\"");

        assertEval("var r14 = convert(\"good\", a -> new api.J<String>() { public java.util.List<String> get() { return java.util.List.of(a, \"c\"); } } );");

        assertEval("r14.get()", "[good, c]");

        assertEval("var r15a = new java.util.ArrayList<String>();");

        assertEval("r15a.add(\"a\");");

        assertEval("var r15b = r15a.get(0);");

        assertEval("r15b", "\"a\"");

    }

    public void test8191842() {

        assertEval("import java.util.stream.*;");

        assertEval("var list = Stream.of(1, 2, 3).map(j -> new Object() { int i = j; }).collect(Collectors.toList());");

        assertEval("list.stream().map(a -> String.valueOf(a.i)).collect(Collectors.joining(\", \"));", "\"1, 2, 3\"");

    }

    public void lvtiRecompileDependentsWithIntersectionTypes() {

        assertEval("<Z extends Runnable & CharSequence> Z get1() { return null; }", added(VALID));

        VarSnippet var = varKey(assertEval("var i1 = get1();", added(VALID)));

        assertEval("import java.util.stream.*;", added(VALID),

                                                 ste(var, VALID, VALID, true, MAIN_SNIPPET));

        assertEval("void t1() { i1.run(); i1.length(); }", added(VALID));

    }

    public void arrayInit() {

        assertEval("int[] d = {1, 2, 3};");

    }

    public void testAnonymousVar() {

        assertEval("new Object() { public String get() { return \"a\"; } }");

        assertEval("$1.get()", "\"a\"");

    }

    public void testIntersectionVar() {

        assertEval("<Z extends Runnable & CharSequence> Z get() { return null; }", added(VALID));

        assertEval("get();", added(VALID));

        assertEval("void t1() { $1.run(); $1.length(); }", added(VALID));

    }

    public void multipleCaptures() {

        assertEval("class D { D(int foo, String bar) { this.foo = foo; this.bar = bar; } int foo; String bar; } ");

        assertEval("var d = new D(34, \"hi\") { String z = foo + bar; };");

        assertEval("d.z", "\"34hi\"");

    }

    public void multipleAnonymous() {

        VarSnippet v1 = varKey(assertEval("new Object() { public int i = 42; public int i1 = i; public int m1() { return i1; } };"));

        VarSnippet v2 = varKey(assertEval("new Object() { public int i = 42; public int i2 = i; public int m2() { return i2; } };"));

        assertEval(v1.name() + ".i", "42");

        assertEval(v1.name() + ".i1", "42");

        assertEval(v1.name() + ".m1()", "42");

        assertDeclareFail(v1.name() + ".i2",

                          new ExpectedDiagnostic("compiler.err.cant.resolve.location", 0, 5, 2,

                                                 -1, -1, Diagnostic.Kind.ERROR));

        assertEval(v2.name() + ".i", "42");

        assertEval(v2.name() + ".i2", "42");

        assertEval(v2.name() + ".m2()", "42");

        assertDeclareFail(v2.name() + ".i1",

                          new ExpectedDiagnostic("compiler.err.cant.resolve.location", 0, 5, 2,

                                                 -1, -1, Diagnostic.Kind.ERROR));

    }

    public void displayName() {

        assertVarDisplayName("var v1 = 234;", "int");

        assertVarDisplayName("var v2 = new int[] {234};", "int[]");

        assertEval("<Z extends Runnable & CharSequence> Z get() { return null; }", added(VALID));

        assertVarDisplayName("var v3 = get();", "CharSequence&Runnable");

        assertVarDisplayName("var v4a = new java.util.ArrayList<String>();", "java.util.ArrayList<String>");

        assertEval("v4a.add(\"a\");");

        assertVarDisplayName("var v4b = v4a.get(0);", "String");

        assertVarDisplayName("var v5 = new Object() { };", "<anonymous class extending Object>");

        assertVarDisplayName("var v6 = new Runnable() { public void run() { } };", "<anonymous class implementing Runnable>");

    }

    private void assertVarDisplayName(String var, String typeName) {

        assertEquals(varKey(assertEval(var)).typeName(), typeName);

    }

    @BeforeMethod

    @Override

    public void setUp() {

        Path path = Paths.get("cp");

        Compiler compiler = new Compiler();

        compiler.compile(path,

                "package api;\n" +

                "\n" +

                "import java.util.List;\n" +

                "\n" +

                "public class C {\n" +

                "   public int i;\n" +

                "   public String s;\n" +

                "   public List<String> l;\n" +

                "   public C(int i) {\n" +

                "       this.i = i;\n" +

                "       this.s = \"empty\";\n" +

                "       this.l = List.of(\"empty\");\n" +

                "   }\n" +

                "   public C(String s) {\n" +

                "       this.i = 3;\n" +

                "       this.s = s;\n" +

                "       this.l = List.of(\"empty\");\n" +

                "   }\n" +

                "   public C(List<String> l) {\n" +

                "       this.i = 4;\n" +

                "       this.s = \"empty\";\n" +

                "       this.l = l;\n" +

                "   }\n" +

                "}\n",

                "package api;\n" +

                "\n" +

                "import java.util.List;\n" +

                "\n" +

                "public class G<T> {\n" +

                "   public List<T> l;\n" +

                "   public G(List<T> l) {\n" +

                "       this.l = l;\n" +

                "   }\n" +

                "}\n",

                "package api;\n" +

                "\n" +