/*

 * Copyright (c) 2015, 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 8008678

 * @summary JSR 292: constant pool reconstitution must support pseudo strings

 * @library /testlibrary

 * @compile -XDignore.symbol.file TestLambdaFormRetransformation.java

 * @run main TestLambdaFormRetransformation

 */

import java.io.IOException;

import java.lang.instrument.ClassFileTransformer;

import java.lang.instrument.IllegalClassFormatException;

import java.lang.instrument.Instrumentation;

import java.lang.instrument.UnmodifiableClassException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.security.ProtectionDomain;

import java.util.Arrays;

import com.oracle.java.testlibrary.ExitCode;

import com.oracle.java.testlibrary.OutputAnalyzer;

import com.oracle.java.testlibrary.ProcessTools;

public class TestLambdaFormRetransformation {

    private static String MANIFEST = String.format("Manifest-Version: 1.0\n" +

                                                   "Premain-Class: %s\n" +

                                                   "Can-Retransform-Classes: true\n",

                                                   Agent.class.getName());

    private static String CP = System.getProperty("test.classes");

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

        Path agent = TestLambdaFormRetransformation.buildAgent();

        OutputAnalyzer oa = ProcessTools.executeTestJvm("-javaagent:" +

                                agent.toAbsolutePath().toString(), "-version");

        oa.shouldHaveExitValue(ExitCode.OK.value);

    }

    private static Path buildAgent() throws IOException {

        Path manifest = TestLambdaFormRetransformation.createManifest();

        Path jar = Files.createTempFile(Paths.get("."), null, ".jar");

        String[] args = new String[] {

            "-cfm",

            jar.toAbsolutePath().toString(),

            manifest.toAbsolutePath().toString(),

            "-C",

            TestLambdaFormRetransformation.CP,

            Agent.class.getName() + ".class"

        };

        sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");

        if (!jarTool.run(args)) {

            throw new Error("jar failed: args=" + Arrays.toString(args));

        }

        return jar;

    }

    private static Path createManifest() throws IOException {

        Path manifest = Files.createTempFile(Paths.get("."), null, ".mf");

        byte[] manifestBytes = TestLambdaFormRetransformation.MANIFEST.getBytes();

        Files.write(manifest, manifestBytes);

        return manifest;

    }

}

class Agent implements ClassFileTransformer {

    private static Runnable lambda = () -> {

        System.out.println("I'll crash you!");

    };

    public static void premain(String args, Instrumentation instrumentation) {

        if (!instrumentation.isRetransformClassesSupported()) {

            System.out.println("Class retransformation is not supported.");

            return;

        }

        System.out.println("Calling lambda to ensure that lambda forms were created");

        Agent.lambda.run();

        System.out.println("Registering class file transformer");

        instrumentation.addTransformer(new Agent());

        for (Class c : instrumentation.getAllLoadedClasses()) {

            if (c.getName().contains("LambdaForm") &&

                instrumentation.isModifiableClass(c)) {

                System.out.format("We've found a modifiable lambda form: %s%n", c.getName());

                try {

                    instrumentation.retransformClasses(c);

                } catch (UnmodifiableClassException e) {

                    throw new AssertionError("Modification of modifiable class " +

                                             "caused UnmodifiableClassException", e);

                }

            }

        }

    }

    public static void main(String args[]) {

    }

    @Override

    public byte[] transform(ClassLoader loader,

                            String className,

                            Class<?> classBeingRedefined,

                            ProtectionDomain protectionDomain,

                            byte[] classfileBuffer

                           ) throws IllegalClassFormatException {

        System.out.println("Transforming " + className);

        return classfileBuffer.clone();

    }

}