/*

 * Copyright 2006-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

import java.beans.ExceptionListener;

import java.beans.XMLDecoder;

import java.beans.XMLEncoder;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.nio.charset.Charset;

abstract class AbstractTest<T> implements ExceptionListener {

    private final BeanValidator validator = new BeanValidator();

    public final void exceptionThrown(Exception exception) {

        throw new Error("unexpected exception", exception);

    }

    /**

     * Returns an object to test.

     * This object will be encoded and decoded

     * and the object creation will be tested.

     *

     * @return an object to test

     */

    protected abstract T getObject();

    /**

     * Returns a different object to test.

     * If this object is not {@code null}

     * it will be encoded and decoded

     * and the object updating will be tested.

     *

     * @return a different object to test

     */

    protected T getAnotherObject() {

        return null;

    }

    /**

     * This method should be overriden

     * if specified encoder should be initialized.

     *

     * @param encoder  the XML encoder to initialize

     */

    protected void initialize(XMLEncoder encoder) {

    }

    /**

     * This method should be overriden

     * if specified decoder should be initialized.

     *

     * @param decoder  the XML decoder to initialize

     */

    protected void initialize(XMLDecoder decoder) {

    }

    /**

     * This method should be overriden

     * for test-specific comparison.

     *

     * @param before  the object before encoding

     * @param after   the object after decoding

     */

    protected void validate(T before, T after) {

        this.validator.validate(before, after);

    }

    /**

     * This is entry point to start testing.

     *

     * @param security  use {@code true} to start

     *                  second pass in secure context

     */

    final void test(boolean security) {

        Bean.DEFAULT = null;

        T object = getObject();

        System.out.println("Test object");

        validate(object, testObject(object));

        System.out.println("Test object creating");

        validate(object, testBean(object));

        Bean.DEFAULT = object;

        object = getAnotherObject();

        if (object != null) {

            System.out.println("Test another object");

            validate(object, testObject(object));

            System.out.println("Test object updating");

            validate(object, testBean(object));

        }

        if (security) {

            System.setSecurityManager(new SecurityManager());

            test(false);

        }

    }

    private T testBean(T object) {

        Bean bean = new Bean();

        bean.setValue(object);

        bean = testObject(bean);

        return (T) bean.getValue();

    }

    private <Z> Z testObject(Z object) {

        byte[] array = writeObject(object);

        System.out.print(new String(array, Charset.forName("UTF-8")));

        return (Z) readObject(array);

    }

    private byte[] writeObject(Object object) {

        ByteArrayOutputStream output = new ByteArrayOutputStream();

        XMLEncoder encoder = new XMLEncoder(output);

        initialize(encoder);

        encoder.writeObject(object);

        encoder.close();

        return output.toByteArray();

    }

    private Object readObject(byte[] array) {

        ByteArrayInputStream input = new ByteArrayInputStream(array);

        XMLDecoder decoder = new XMLDecoder(input);

        initialize(decoder);

        Object object = decoder.readObject();

        decoder.close();

        return object;

    }

}