/*

 * 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 8010737

 * @summary javac, known parameter's names should be copied to automatically

 * generated constructors for inner classes

 * @run main ParameterNamesAreNotCopiedToAnonymousInitTest check_class_file check_init_symbol

 */

import java.io.File;

import java.io.IOException;

import java.lang.annotation.ElementType;

import java.lang.annotation.Target;

import java.nio.file.Paths;

import java.util.Arrays;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.StandardJavaFileManager;

import javax.tools.ToolProvider;

import com.sun.source.tree.CompilationUnitTree;

import com.sun.source.tree.Tree;

import com.sun.source.util.JavacTask;

import com.sun.source.util.TaskEvent;

import com.sun.source.util.TaskListener;

import com.sun.tools.classfile.ClassFile;

import com.sun.tools.classfile.Method;

import com.sun.tools.javac.api.BasicJavacTask;

import com.sun.tools.javac.code.Attribute.Compound;

import com.sun.tools.javac.code.Symbol.ClassSymbol;

import com.sun.tools.javac.code.Symbol.VarSymbol;

import com.sun.tools.javac.tree.JCTree;

import com.sun.tools.javac.tree.TreeScanner;

import com.sun.tools.javac.util.Assert;

import com.sun.tools.javac.util.Context;

import com.sun.tools.javac.util.List;

import com.sun.tools.javac.util.Names;

public class ParameterNamesAreNotCopiedToAnonymousInitTest {

    static final String noParamsErrorMsg =

            "Test most be invoked with at least one parameter: check_class_file " +

            "and/or check_init_symbol";

    static final String wrongParamsErrorMsg =

            "Accepted arguments are: check_class_file and check_init_symbol";

    static final String paramNameNotCopiedAssertionMsg =

            "The param name hasn't been copied to the init method";

    static final String noAnnotationsForParameterMsg =

            "No annotations for seek parameter";

    static final String seekMethodNotFound =

            "The seek init method was not found or conditions were not met";

    static final String nonNullParamPositionsMsg =

            "Parameter positions shold not be null";

    static final String compilationFailed =

            "Compilation failed";

    static final String seekMethodNotFoundMsg =

        "The seek method was not found";

    static final String ParamAnnotationClassName =

            ParameterNamesAreNotCopiedToAnonymousInitTest.class.getSimpleName() + "." +

            ParamAnnotation.class.getSimpleName();

    public static void main(String[] args) throws Exception {

        if (args.length == 0) {

            throw new Error(noParamsErrorMsg);

        }

        new ParameterNamesAreNotCopiedToAnonymousInitTest().run(args);

    }

    void run(String[] args) throws Exception {

        for (String arg : args) {

            if (arg.equals("check_class_file")) {

                checkClassFile(new File(Paths.get(System.getProperty("test.classes"),

                        this.getClass().getName() + "$initParams$1.class").toUri()), 1);

                checkClassFile(new File(Paths.get(System.getProperty("test.classes"),

                        this.getClass().getName() + "$Generics$1.class").toUri()), 2);

            } else if (arg.equals("check_init_symbol")) {

                checkInitSymbol("m1", Arrays.asList(0), Arrays.asList("i"));

                checkInitSymbol("m2", Arrays.asList(0, 1), Arrays.asList("t1", "t2"));

            } else {

                error(wrongParamsErrorMsg);

            }

        }

    }

    void checkClassFile(final File cfile, int numberOfParams) throws Exception {

        ClassFile classFile = ClassFile.read(cfile);

        boolean methodFound = false;

        for (Method method : classFile.methods) {

            if (method.getName(classFile.constant_pool).equals("<init>")) {

                methodFound = true;

            }

        }

        Assert.check(methodFound, seekMethodNotFoundMsg);

    }

    /*  This method expect a non-null ordered list of integers, listing the

     *  position of the parameters to be checked on the init method. Position 0

     *  corresponds to the first parameter.

     *

     *  As we are looking for a constructor of an anonymous class, the

     *  classOwnerName parameter must be the name of the method where the

     *  anonymous class is declared.

     */

    void checkInitSymbol(

            final String classOwnerName,

            final java.util.List<Integer> paramsToCheck,

            final java.util.List<String> paramNames)

            throws IOException {

        Assert.checkNonNull(paramsToCheck, nonNullParamPositionsMsg);

        JavaCompiler c = ToolProvider.getSystemJavaCompiler();

        try (StandardJavaFileManager fm = c.getStandardFileManager(null, null, null)) {

            Iterable<? extends JavaFileObject> fos =

                    fm.getJavaFileObjectsFromFiles(

                    Arrays.asList(new File(System.getProperty("test.src"),

                    this.getClass().getName() + ".java")));

            JavacTask task = (JavacTask) c.getTask(null, fm, null,

                    Arrays.asList("-d", System.getProperty("user.dir")), null, fos);

            BasicJavacTask impl = (BasicJavacTask)task;

            Context context = impl.getContext();

            final Names names = Names.instance(context);

            task.addTaskListener(new TaskListener() {

                @Override

                public void started(TaskEvent e) {}

                @Override

                public void finished(TaskEvent e) {

                    class TheTreeScanner extends TreeScanner {

                        boolean foundAndCorrect = false;

                        @Override

                        public void visitMethodDef(JCTree.JCMethodDecl tree) {

                            ClassSymbol clazz = (ClassSymbol)tree.sym.owner;

                            if (clazz.owner.name.toString().equals(classOwnerName) &&

                                tree.sym.name == names.init) {

                                int currentParamPos = 0;

                                int paramArrayIndex = 0;

                                List<VarSymbol> params = tree.sym.params;

                                while (params.nonEmpty() && paramArrayIndex < paramsToCheck.size()) {

                                    VarSymbol param = params.head;

                                    if (currentParamPos == paramsToCheck.get(paramArrayIndex)) {

                                        if (!param.name.toString()

                                                .equals(paramNames.get(paramArrayIndex))) {

                                            error(paramNameNotCopiedAssertionMsg);

                                        }

                                        paramArrayIndex++;

                                    }

                                    currentParamPos++;

                                    params = params.tail;

                                }

                                foundAndCorrect = paramArrayIndex >= paramsToCheck.size();

                            }

                            super.visitMethodDef(tree);

                        }

                    }

                    if (e.getKind() == TaskEvent.Kind.ANALYZE) {

                        CompilationUnitTree compUnitTree = e.getCompilationUnit();

                        boolean foundAndCorrect = false;

                        for (Tree tree : compUnitTree.getTypeDecls()) {

                            TheTreeScanner scanner = new TheTreeScanner();

                            scanner.scan((JCTree) tree);

                            foundAndCorrect = foundAndCorrect | scanner.foundAndCorrect;

                        }

                        if (!foundAndCorrect) {

                            error(seekMethodNotFound);

                        }

                    }

                }

            });

            if (!task.call()) {

                error(compilationFailed);

            }

        }

    }

    void error(String msg) {

        throw new AssertionError(msg);

    }

    @Target(value = {ElementType.PARAMETER})

    @interface ParamAnnotation {}

    /*  If more cases are added in the future, it should be taken into account

     *  that method checkInitSymbol locates the inner class looking for its

     *  container method, which in the cases below are m1 and m2. So new cases

     *  must have different names for container methods or method checkInitSymbol

     *  should be changed.

     */

    public class initParams {

        public initParams(@ParamAnnotation int i) {}

        public void m1() {

            new initParams(2) {};

        }

    }

    class Generics<T1> {

        T1 obj1;

        Object obj2;

        <T2> Generics(@ParamAnnotation T1 t1, @ParamAnnotation T2 t2) {

            obj1 = t1;

            obj2 = t2;

        }

        void m2() {

            Generics<Integer> a = new <String>Generics<Integer>(

                    new Integer(11), "foo") {};

        }

    }

}