/**

  * Copyright (c) 2012-2016, 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.dynamo;

 import com.amazonaws.services.dynamodbv2.model.AttributeValue;

 import com.amazonaws.services.dynamodbv2.model.ComparisonOperator;

 import com.amazonaws.services.dynamodbv2.model.Condition;

 import com.google.common.base.Joiner;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.aspects.Loggable;

 import com.jcabi.immutable.ArrayMap;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Map;

 import java.util.Set;

 import java.util.concurrent.ConcurrentHashMap;

 import java.util.concurrent.ConcurrentMap;

 import lombok.EqualsAndHashCode;

 /**

  * DynamoDB query conditions.

  *

  * <p>It's a convenient immutable builder of a map of conditions for

  * DynamoDB query/scan operations. Use it like this:

  *

  * <pre>Map&lt;String, Condition&gt; conditions = new Conditions()

  *   .with("hash", Conditions.equalTo("some value"))

  *   .with("range", Conditions.equalTo(12345));

  * </pre>

  *

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

  * @version $Id: 74a696df8176f872b7cda9ab44f9e5c8985261d6 $

  * @since 0.1

  */

 @Immutable

 @Loggable(Loggable.DEBUG)

 @EqualsAndHashCode(of = "conds")

 @SuppressWarnings

     (

         {

             "PMD.TooManyMethods",

             "PMD.AvoidInstantiatingObjectsInLoops"

         }

     )

 public final class Conditions implements Map<String, Condition> {

     /**

      * Pairs.

      */

     private final transient ArrayMap<String, Condition> conds;

     /**

      * Public ctor.

      */

     public Conditions() {

         this(new ArrayMap<String, Condition>());

     }

     /**

      * Public ctor.

      * @param map Map of them

      */

     public Conditions(final Map<String, Condition> map) {

         this.conds = Conditions.array(map);

     }

     /**

      * Equal to static condition builder (factory method).

      * @param value The value to equal to

      * @return The condition just created

      */

     public static Condition equalTo(final Object value) {

         final AttributeValue attr;

         if (value instanceof Long || value instanceof Integer) {

             attr = new AttributeValue().withN(value.toString());

         } else {

             attr = new AttributeValue().withS(value.toString());

         }

         return Conditions.equalTo(attr);

     }

     /**

      * Equal to static condition builder (factory method).

      * @param value The value to equal to

      * @return The condition just created

      */

     public static Condition equalTo(final AttributeValue value) {

         return new Condition()

             .withComparisonOperator(ComparisonOperator.EQ)

             .withAttributeValueList(value);

     }

     /**

      * With this condition.

      * @param name Attribute name

      * @param value The condition

      * @return New map of conditions

      */

     public Conditions with(final String name, final Condition value) {

         return new Conditions(

             this.conds.with(name, value)

         );

     }

     /**

      * With this condition.

      * @param name Attribute name

      * @param value The condition

      * @return New map of conditions

      * @since 0.18

      */

     public Conditions with(final String name, final Object value) {

         return new Conditions(

             this.conds.with(

                 name,

                 Conditions.equalTo(value)

             )

         );

     }

     /**

      * With these conditions.

      * @param map The conditions

      * @return New map of conditions

      */

     public Conditions withAttributes(final Map<String, AttributeValue> map) {

         final ConcurrentMap<String, Condition> cnds =

             new ConcurrentHashMap<String, Condition>(map.size());

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

             cnds.put(

                 entry.getKey(),

                 Conditions.equalTo(entry.getValue())

             );

         }

         return new Conditions(this.conds.with(cnds));

     }

     /**

      * With these conditions.

      * @param map The conditions

      * @return New map of conditions

      */

     public Conditions with(final Map<String, Condition> map) {

         return new Conditions(this.conds.with(map));

     }

     @Override

     public String toString() {

         final Collection<String> terms =

             new ArrayList<String>(this.conds.size());

         for (final Map.Entry<String, Condition> cond : this.conds.entrySet()) {

             terms.add(

                 String.format(

                     "%s %s %s",

                     cond.getKey(),

                     cond.getValue().getComparisonOperator(),

                     cond.getValue().getAttributeValueList()

                 )

             );

         }

         return Joiner.on(" AND ").join(terms);

     }

     @Override

     public int size() {

         return this.conds.size();

     }

     @Override

     public boolean isEmpty() {

         return this.conds.isEmpty();

     }

     @Override

     public boolean containsKey(final Object key) {

         return this.conds.containsKey(key.toString());

     }

     @Override

     public boolean containsValue(final Object value) {

         return this.conds.containsValue(value);

     }

     @Override

     public Condition get(final Object key) {

         return this.conds.get(key.toString());

     }

     @Override

     public Set<String> keySet() {

         return this.conds.keySet();

     }

     @Override

     public Collection<Condition> values() {

         return this.conds.values();

     }

     @Override

     public Set<Map.Entry<String, Condition>> entrySet() {

         return this.conds.entrySet();

     }

     @Override

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

         throw new UnsupportedOperationException(

             "Conditions class is immutable, can't do #put()"

         );

     }

     @Override

     public Condition remove(final Object key) {

         throw new UnsupportedOperationException(

             "Conditions class is immutable, can't do #remove()"

         );

     }

     @Override

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

         throw new UnsupportedOperationException(

             "Conditions class is immutable, can't do #putAll()"

         );

     }

     @Override

     public void clear() {

         throw new UnsupportedOperationException(

             "Conditions class is immutable, can't do #clear()"

         );

     }

     /**

      * Convert map to ArrayMap.

      * @param map Map of them

      * @return Array map

      */

     private static ArrayMap<String, Condition> array(

         final Map<String, Condition> map) {

         final ConcurrentMap<String, Condition> cnds =

             new ConcurrentHashMap<String, Condition>(map.size());

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

             cnds.put(

                 entry.getKey(),

                 entry.getValue()

             );

         }

         return new ArrayMap<String, Condition>(cnds);

     }

 }