/**
    * Copyright 2005-2014 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
          }
      }
  }