/*

  * Copyright 2012-2013 smartics, Kronseder & Reiner GmbH

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package de.smartics.properties.spi.config.support;

 import java.util.Collection;

 import java.util.Iterator;

 import java.util.Map.Entry;

 import java.util.Properties;

 import java.util.Set;

 import javax.annotation.concurrent.NotThreadSafe;

 import de.smartics.properties.api.config.domain.Property;

 import de.smartics.properties.api.config.domain.PropertyCollection;

 import de.smartics.properties.api.config.domain.PropertyLocation;

 import de.smartics.util.lang.Arg;

 /**

  * Implementation of {@link PropertyCollection} based on properties.

  */

 @NotThreadSafe

 public final class PropertiesPropertyCollection implements PropertyCollection

 {

   // ********************************* Fields *********************************

   // --- constants ------------------------------------------------------------

   // --- members --------------------------------------------------------------

   /**

    * The properties to iterate over.

    */

   private final Properties properties = new Properties();

   // ****************************** Initializer *******************************

   // ****************************** Constructors ******************************

   /**

    * Constructor to add properties via a collection.

    *

    * @param properties the properties to iterate over.

    */

   public PropertiesPropertyCollection(final Collection<Properties> properties)

   {

     Arg.checkNotNull("properties", properties);

     for (final Properties element : properties)

     {

       this.properties.putAll(element);

     }

   }

   /**

    * Constructor to add properties.

    *

    * @param properties the properties to iterate over.

    */

   public PropertiesPropertyCollection(final Properties... properties)

   {

     Arg.checkNotNull("properties", properties);

     for (final Properties element : properties)

     {

       this.properties.putAll(element);

     }

   }

   // ****************************** Inner Classes *****************************

   // ********************************* Methods ********************************

   // --- init -----------------------------------------------------------------

   // --- get&set --------------------------------------------------------------

   // --- business -------------------------------------------------------------

   /**

    * {@inheritDoc}

    *

    * @see java.lang.Iterable#iterator()

    */

   @Override

   public Iterator<Property> iterator()

   {

     final Set<Entry<Object, Object>> entrySet = properties.entrySet();

     final Iterator<Entry<Object, Object>> i = entrySet.iterator();

     // CHECKSTYLE:OFF

     return new Iterator<Property>() // NOPMD CHECKSTYLE:ON

     {

       @Override

       public boolean hasNext()

       {

         return i.hasNext();

       }

       @Override

       public Property next()

       {

         final Entry<Object, Object> entry = i.next();

         final Object value = entry.getValue();

         if (value instanceof Property)

         {

           return (Property) value;

         }

         else

         {

           return new Property(new PropertyLocation(getClass().getName()),

               (String) entry.getKey(), entry.getValue());

         }

       }

       @Override

       public void remove()

       {

         throw new UnsupportedOperationException("Remove not supported.");

       }

     };

   }

   @Override

   public void close()

   {

   }

   // --- object basics --------------------------------------------------------

 }