/**

  * 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 java.util.Arrays;

 import java.util.Collection;

 import java.util.Formattable;

 import java.util.Formatter;

 import lombok.EqualsAndHashCode;

 import lombok.ToString;

 /**

  * Format list.

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

  * @version $Id: 6af3dee662a4ca91fc5a29610c93d7187ee0f03c $

  * @since 0.1

  */

 @ToString

 @EqualsAndHashCode(of = "list")

 final class ListDecor implements Formattable {

     /**

      * The list.

      */

     private final transient Collection<?> list;

     /**

      * Public ctor.

      * @param obj The object to format

      * @throws DecorException If some problem with it

      */

     ListDecor(final Object obj) throws DecorException {

         if (obj == null || obj instanceof Collection) {

             this.list = Collection.class.cast(obj);

         } else if (obj instanceof Object[]) {

             this.list = Arrays.asList((Object[]) obj);

         } else {

             throw new DecorException(

                 String.format(

                     "Collection or array required, while %s provided",

                     obj.getClass().getName()

                 )

             );

         }

     }

     /**

      * {@inheritDoc}

      * @checkstyle ParameterNumber (4 lines)

      */

     @Override

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

         final int width, final int precision) {

         final StringBuilder builder = new StringBuilder(0);

         builder.append('[');

         if (this.list == null) {

             builder.append("NULL");

         } else {

             boolean first = true;

             for (final Object item : this.list) {

                 if (!first) {

                     builder.append(", ");

                 }

                 builder.append(String.format("\"%s\"", item));

                 first = false;

             }

         }

         builder.append(']');

         formatter.format("%s", builder.toString());

     }

 }