/**

  * Copyright (c) 2012-2014, 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.simpledb;

 import com.amazonaws.services.simpledb.model.Attribute;

 import com.amazonaws.services.simpledb.model.DeleteAttributesRequest;

 import com.amazonaws.services.simpledb.model.GetAttributesRequest;

 import com.amazonaws.services.simpledb.model.GetAttributesResult;

 import com.amazonaws.services.simpledb.model.PutAttributesRequest;

 import com.amazonaws.services.simpledb.model.ReplaceableAttribute;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.aspects.Loggable;

 import java.util.AbstractMap;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.HashSet;

 import java.util.Map;

 import java.util.Set;

 import java.util.concurrent.ConcurrentHashMap;

 import java.util.concurrent.ConcurrentMap;

 import lombok.EqualsAndHashCode;

 /**

  * Single item/row in a SimpleDB table.

  *

  * @author Yegor Bugayenko (yegor@tpc2.com)

  * @version $Id$

  * @since 0.1

  * @checkstyle ClassDataAbstractionCoupling (500 lines)

  */

 @Immutable

 @Loggable(Loggable.DEBUG)

 @EqualsAndHashCode(of = { "credentials", "table", "label" })

 @SuppressWarnings("PMD.TooManyMethods")

 final class AwsItem implements Item {

     /**

      * AWS credentials.

      */

     private final transient Credentials credentials;

     /**

      * Table name.

      */

     private final transient String table;

     /**

      * Table name.

      */

     private final transient String label;

     /**

      * Public ctor.

      * @param creds Credentials

      * @param tbl Table name

      * @param item Item name

      */

     protected AwsItem(final Credentials creds, final String tbl,

         final String item) {

         this.credentials = creds;

         this.table = tbl;

         this.label = item;

     }

     /**

      * Public ctor.

      * @param creds Credentials

      * @param tbl Table name

      * @param item Item name

      */

     protected AwsItem(final Credentials creds, final String tbl,

         final com.amazonaws.services.simpledb.model.Item item) {

         this(creds, tbl, item.getName());

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public String toString() {

         return String.format("%s in %s", this.label, this.table);

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public String name() {

         return this.label;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public int size() {

         return this.entrySet().size();

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public boolean isEmpty() {

         return this.entrySet().isEmpty();

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public boolean containsKey(final Object key) {

         return this.keySet().contains(key);

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public boolean containsValue(final Object value) {

         return this.values().contains(value);

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public String get(final Object key) {

         final Set<Entry<String, String>> entries = this.entrySet();

         String value = null;

         for (final Entry<String, String> entry : entries) {

             if (entry.getKey().equals(key)) {

                 value = entry.getValue();

             }

         }

         return value;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public String put(final String key, final String value) {

         final String before = this.get(key);

         final ConcurrentMap<String, String> map =

             new ConcurrentHashMap<String, String>(0);

         map.put(key, value);

         this.putAll(map);

         return before;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public String remove(final Object key) {

         final String before = this.get(key);

         this.credentials.aws().deleteAttributes(

             new DeleteAttributesRequest()

                 .withDomainName(this.table)

                 .withItemName(this.label)

                 .withAttributes(new Attribute().withName(key.toString()))

         );

         return before;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     @SuppressWarnings("PMD.AvoidInstantiatingObjectsInLoops")

     public void putAll(final Map<? extends String, ? extends String> map) {

         final Collection<ReplaceableAttribute> attrs =

             new ArrayList<ReplaceableAttribute>(map.size());

         for (final Map.Entry<?, ?> entry : map.entrySet()) {

             attrs.add(

                 new ReplaceableAttribute()

                     .withName(entry.getKey().toString())

                     .withValue(entry.getValue().toString())

                     .withReplace(true)

             );

         }

         this.credentials.aws().putAttributes(

             new PutAttributesRequest()

                 .withDomainName(this.table)

                 .withItemName(this.label)

                 .withAttributes(attrs)

         );

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public void clear() {

         this.credentials.aws().deleteAttributes(

             new DeleteAttributesRequest()

                 .withDomainName(this.table)

                 .withItemName(this.label)

         );

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public Set<String> keySet() {

         final Set<Entry<String, String>> entries = this.entrySet();

         final Set<String> keys = new HashSet<String>(entries.size());

         for (final Entry<String, String> entry : entries) {

             keys.add(entry.getValue());

         }

         return keys;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public Collection<String> values() {

         final Set<Entry<String, String>> entries = this.entrySet();

         final Collection<String> values = new ArrayList<String>(entries.size());

         for (final Entry<String, String> entry : entries) {

             values.add(entry.getValue());

         }

         return values;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     @SuppressWarnings("PMD.AvoidInstantiatingObjectsInLoops")

     public Set<Entry<String, String>> entrySet() {

         final GetAttributesResult result = this.credentials.aws().getAttributes(

             new GetAttributesRequest()

                 .withConsistentRead(true)

                 .withDomainName(this.table)

                 .withItemName(this.label)

         );

         final Set<Entry<String, String>> entries =

             new HashSet<Entry<String, String>>(0);

         for (final Attribute attr : result.getAttributes()) {

             entries.add(

                 new AbstractMap.SimpleImmutableEntry<String, String>(

                     attr.getName(), attr.getValue()

                 )

             );

         }

         return entries;

     }

 }