/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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 org.kuali.rice.krad.keyvalues;

 import com.google.common.base.Function;

 import com.google.common.collect.Collections2;

 import com.google.common.collect.ImmutableList;

 import com.google.common.collect.ImmutableMap;

 import org.kuali.rice.core.api.util.ConcreteKeyValue;

 import org.kuali.rice.core.api.util.KeyValue;

 import java.util.Collection;

 import java.util.List;

 import java.util.Map;

 /** a factory for creating key-values finders. */

 public final class KeyValuesFinderFactory {

     private KeyValuesFinderFactory() {

         throw new UnsupportedOperationException("do not call");

     }

     public static KeyValuesFinder fromMap(Map<String, String> map) {

         if (map == null) {

             throw new IllegalArgumentException("map is null");

         }

         return new MapBased(map);

     }

     private static final class MapBased implements KeyValuesFinder {

         private final Map<String, String> map;

         private MapBased(Map<String, String> map) {

             this.map = ImmutableMap.copyOf(map);

         }

         @Override

         public List<KeyValue> getKeyValues() {

             Collection<KeyValue> kvs = Collections2.transform(map.entrySet(), new Function<Map.Entry<String, String>, KeyValue>() {

                 @Override

                 public KeyValue apply(Map.Entry<String, String> input) {

                     return new ConcreteKeyValue(input);

                 }

             });

             return ImmutableList.copyOf(kvs);

         }

         @Override

         public List<KeyValue> getKeyValues(boolean includeActiveOnly) {

             return getKeyValues();

         }

         @Override

         public Map<String, String> getKeyLabelMap() {

             return map;

         }

         @Override

         public String getKeyLabel(String key) {

             return map.get(key);

         }

         @Override

         public void clearInternalCache() {

             //do nothing

         }

     }

 }