/*

 * Copyright (c) 2013, 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.

 */

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStream;

import java.lang.annotation.Annotation;

import java.lang.instrument.ClassDefinition;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.reflect.Method;

public class RedefineMethodWithAnnotationsApp {

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

        System.out.println("Hello from RedefineMethodWithAnnotationsApp!");

        new RedefineMethodWithAnnotationsApp().doTest();

        System.exit(0);

    }

    private void doTest() throws Exception {

        doMethodParameterAnnotationsTest();

    }

    private void doMethodParameterAnnotationsTest() throws Exception {

        verifyMethodParameterAnnotationsValue(

                ParameterAnnotation.STRING_VALUE_1);

        doRedefine(RedefineMethodWithAnnotationsTarget.class);

        verifyMethodParameterAnnotationsValue(

                ParameterAnnotation.STRING_VALUE_2);

    }

    private static void verifyMethodParameterAnnotationsValue(

            String expectedValue) throws Exception {

        Class<RedefineMethodWithAnnotationsTarget> c =

                RedefineMethodWithAnnotationsTarget.class;

        Method method = c.getMethod("annotatedMethod", String.class);

        Annotation [][] parametersAnnotations =

                method.getParameterAnnotations();

        if (parametersAnnotations.length != 1) {

            throw new Exception("Incorrect number of parameters to method: " +

                    method.getName() + "." +

                    " Expected: 1," +

                    " got: " + parametersAnnotations.length);

        }

        Annotation[] parameterAnnotations = parametersAnnotations[0];

        if (parameterAnnotations.length != 1) {

            throw new Exception("Incorrect number of annotations." +

                    " Expected: 1" +

                    ", got " + parameterAnnotations.length);

        }

        Annotation parameterAnnotation = parameterAnnotations[0];

        if (!(parameterAnnotation instanceof ParameterAnnotation)) {

            throw new Exception("Incorrect Annotation class." +

                    " Expected: " + ParameterAnnotation.class.getName() +

                    ", got: " + parameterAnnotation.getClass().getName());

        }

        ParameterAnnotation pa = (ParameterAnnotation)parameterAnnotation;

        String annotationValue = pa.value();

        if (!expectedValue.equals(annotationValue)) {

            throw new Exception("Incorrect parameter annotation value." +

                    " Expected: " + expectedValue +

                    ", got: " + annotationValue);

        }

    }

    private static void doRedefine(Class<?> clazz) throws Exception {

        // Load the second version of this class.

        File f = new File(clazz.getName() + ".class");

        System.out.println("Reading test class from " + f);

        InputStream redefineStream = new FileInputStream(f);

        byte[] redefineBuffer = NamedBuffer.loadBufferFromStream(redefineStream);

        ClassDefinition redefineParamBlock = new ClassDefinition(

                clazz, redefineBuffer);

        RedefineMethodWithAnnotationsAgent.getInstrumentation().redefineClasses(

                new ClassDefinition[] {redefineParamBlock});

    }

}