/**

  * Copyright (c) 2012-2015, jcabi.com

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met: 1) Redistributions of source code must retain the above

  * copyright notice, this list of conditions and the following

  * disclaimer. 2) Redistributions in binary form must reproduce the above

  * copyright notice, this list of conditions and the following

  * disclaimer in the documentation and/or other materials provided

  * with the distribution. 3) Neither the name of the jcabi.com nor

  * the names of its contributors may be used to endorse or promote

  * products derived from this software without specific prior written

  * permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT

  * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL

  * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

  * OF THE POSSIBILITY OF SUCH DAMAGE.

  */

 package com.jcabi.log;

 import com.jcabi.aspects.Immutable;

 import java.lang.reflect.Field;

 import java.security.AccessController;

 import java.security.PrivilegedAction;

 import java.util.Arrays;

 import java.util.Formattable;

 import java.util.Formatter;

 import lombok.EqualsAndHashCode;

 import lombok.ToString;

 /**

  * Format internal structure of an object.

  * @author Marina Kosenko (marina.kosenko@gmail.com)

  * @author Yegor Bugayenko (yegor@teamed.io)

  * @version $Id: aff0b3ff32a65cbf92af934aa9f440b2a6e8ce92 $

  * @since 0.1

  */

 @ToString

 @EqualsAndHashCode(of = "object")

 final class ObjectDecor implements Formattable {

     /**

      * The object to work with.

      */

     private final transient Object object;

     /**

      * Public ctor.

      * @param obj The object to format

      */

     ObjectDecor(final Object obj) {

         this.object = obj;

     }

     // @checkstyle ParameterNumber (4 lines)

     @Override

     public void formatTo(final Formatter formatter, final int flags,

         final int width, final int precision) {

         if (this.object == null) {

             formatter.format("NULL");

         } else if (this.object.getClass().isArray()) {

             formatter.format(

                 AccessController.doPrivileged(

                     new ArrayFormatAction((Object[]) this.object)

                 )

             );

         } else {

             final String output =

                 AccessController.doPrivileged(

                     new ObjectDecor.ObjectContentsFormatAction(this.object)

                 );

             formatter.format(output);

         }

     }

     /**

      * {@link PrivilegedAction} for obtaining array contents.

      * @author Aleksey Popov (alopen@yandex.ru)

      * @version $Id: aff0b3ff32a65cbf92af934aa9f440b2a6e8ce92 $

      */

     @Immutable

     private static final class ArrayFormatAction

         implements PrivilegedAction<String>  {

         /**

          * Array to format.

          */

         private final transient Object[] array;

         /**

          * Constructor.

          * @param arr Array to format

          */

         ArrayFormatAction(final Object... arr) {

             this.array = Arrays.copyOf(arr, arr.length);

         }

         @Override

         @SuppressWarnings("PMD.AvoidInstantiatingObjectsInLoops")

         public String run() {

             final StringBuilder builder = new StringBuilder("[");

             final Formatter formatter = new Formatter(builder);

             for (final Object obj : this.array) {

                 new ObjectDecor(obj).formatTo(formatter, 0, 0, 0);

                 // @checkstyle MultipleStringLiteralsCheck (1 line)

                 builder.append(", ");

             }

             builder.replace(builder.length() - 2, builder.length(), "]");

             return builder.toString();

         }

     }

     /**

      * {@link PrivilegedAction} for obtaining object contents.

      * @author Marina Kosenko (marina.kosenko@gmail.com)

      * @author Yegor Bugayenko (yegor@teamed.io)

      * @version $Id: aff0b3ff32a65cbf92af934aa9f440b2a6e8ce92 $

      */

     @Immutable

     private static final class ObjectContentsFormatAction

         implements PrivilegedAction<String> {

         /**

          * Object to format.

          */

         private final transient Object object;

         /**

          * Constructor.

          * @param obj Object to format

          */

         ObjectContentsFormatAction(final Object obj) {

             this.object = obj;

         }

         @Override

         public String run() {

             final StringBuilder builder = new StringBuilder("{");

             for (final Field field

                 : this.object.getClass().getDeclaredFields()) {

                 field.setAccessible(true);

                 try {

                     builder.append(

                         String.format(

                             "%s: \"%s\"",

                             field.getName(),

                             field.get(this.object)

                         )

                     );

                 } catch (final IllegalAccessException ex) {

                     throw new IllegalStateException(ex);

                 }

                 // @checkstyle MultipleStringLiteralsCheck (1 line)

                 builder.append(", ");

             }

             builder.replace(builder.length() - 2, builder.length(), "}");

             return builder.toString();

         };

     }

 }