/*

  * 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.core.value;

 import java.io.Serializable;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.LinkedHashMap;

 import java.util.List;

 import java.util.Locale;

 import java.util.Map;

 import de.smartics.properties.api.core.domain.PropertyValueRange;

 import de.smartics.util.lang.Arg;

 import de.smartics.util.lang.NullArgumentException;

 /**

  * Defines a set of valid enumerable elements for values of a property.

  *

  * @param <T> the type of the property values within the given range. Please

  *          note that the type is required to be serializable. Otherwise

  *          instances of this class are also not serializable.

  */

 public final class CollectionPropertyValueRange<T> implements

     PropertyValueRange<T>, Serializable

 {

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

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

   /**

    * The class version identifier.

    */

   private static final long serialVersionUID = 1L;

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

   /**

    * The values mapped by their string representation to their value instance.

    *

    * @serial

    */

   private final Map<String, T> valueRange;

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

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

   /**

    * Constructor accepting an array of values.

    *

    * @param values the allowed values for this value range.

    * @throws NullArgumentException if {@code values} is <code>null</code>.

    */

   public CollectionPropertyValueRange(final T[] values)

     throws NullArgumentException

   {

     Arg.checkNotNull("values", values);

     this.valueRange = createMap(values);

   }

   /**

    * Constructor accepting a collection of values.

    *

    * @param values the allowed values for this value range.

    * @throws NullArgumentException if {@code values} is <code>null</code>.

    */

   public CollectionPropertyValueRange(final Collection<T> values)

     throws NullArgumentException

   {

     Arg.checkNotNull("values", values);

     this.valueRange = createMap(values);

   }

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

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

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

   private static <T> Map<String, T> createMap(final T[] values)

   {

     final Map<String, T> map = new LinkedHashMap<String, T>(values.length);

     for (T value : values)

     {

       map.put(String.valueOf(value), value);

     }

     return map;

   }

   private static <T> Map<String, T> createMap(final Collection<T> values)

   {

     final Map<String, T> map = new LinkedHashMap<String, T>(values.size());

     for (T value : values)

     {

       map.put(String.valueOf(value), value);

     }

     return map;

   }

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

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

   @Override

   public List<T> getValues()

   {

     final List<T> list = new ArrayList<T>(valueRange.values());

     return list;

   }

   @Override

   public T fromString(final String valueAsString)

     throws IllegalArgumentException

   {

     final T value = valueRange.get(valueAsString);

     if (value != null)

     {

       return value;

     }

     else

     {

       throw new IllegalArgumentException(

           "The value '" + valueAsString

               + "' is not a valid value. Valid values are "

               + valueRange.values());

     }

   }

   @Override

   public boolean isCommented()

   {

     return false;

   }

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

   /**

    * Returns the hash code of the object.

    *

    * @return the hash code.

    */

   @Override

   public int hashCode()

   {

     return valueRange.hashCode();

   }

   /**

    * Returns <code>true</code> if the given object is semantically equal to the

    * given object, <code>false</code> otherwise.

    *

    * @param object the instance to compare to.

    * @return <code>true</code> if the given object is semantically equal to the

    *         given object, <code>false</code> otherwise.

    */

   @Override

   public boolean equals(final Object object)

   {

     if (this == object)

     {

       return true;

     }

     else if (object == null || getClass() != object.getClass())

     {

       return false;

     }

     final CollectionPropertyValueRange<?> other =

         (CollectionPropertyValueRange<?>) object;

     return (valueRange.equals(other.valueRange));

   }

   @Override

   public String toString(final Locale locale)

   {

     final StringBuilder buffer = new StringBuilder(64);

     for (String value : valueRange.keySet())

     {

       buffer.append(value).append(", ");

     }

     final int length = buffer.length();

     if (length > 0)

     {

       buffer.setLength(length - 2);

     }

     return buffer.toString();

   }

   @Override

   public String toString()

   {

     return toString(Locale.getDefault());

   }

 }