001/**
002 * Copyright 2005-2016 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.kuali.rice.krad.keyvalues;
017
018import com.google.common.base.Function;
019import com.google.common.collect.Collections2;
020import com.google.common.collect.ImmutableList;
021import com.google.common.collect.ImmutableMap;
022import org.kuali.rice.core.api.util.ConcreteKeyValue;
023import org.kuali.rice.core.api.util.KeyValue;
024
025import java.util.Collection;
026import java.util.List;
027import java.util.Map;
028
029/** a factory for creating key-values finders. */
030public final class KeyValuesFinderFactory {
031    private KeyValuesFinderFactory() {
032        throw new UnsupportedOperationException("do not call");
033    }
034
035    public static KeyValuesFinder fromMap(Map<String, String> map) {
036        if (map == null) {
037            throw new IllegalArgumentException("map is null");
038        }
039
040        return new MapBased(map);
041    }
042
043    private static final class MapBased implements KeyValuesFinder {
044        private final Map<String, String> map;
045
046        private MapBased(Map<String, String> map) {
047            this.map = ImmutableMap.copyOf(map);
048        }
049
050        @Override
051        public List<KeyValue> getKeyValues() {
052            Collection<KeyValue> kvs = Collections2.transform(map.entrySet(), new Function<Map.Entry<String, String>, KeyValue>() {
053                @Override
054                public KeyValue apply(Map.Entry<String, String> input) {
055                    return new ConcreteKeyValue(input);
056                }
057            });
058            return ImmutableList.copyOf(kvs);
059        }
060
061        @Override
062        public List<KeyValue> getKeyValues(boolean includeActiveOnly) {
063            return getKeyValues();
064        }
065
066        @Override
067        public Map<String, String> getKeyLabelMap() {
068            return map;
069        }
070
071        @Override
072        public String getKeyLabel(String key) {
073            return map.get(key);
074        }
075
076        @Override
077        public void clearInternalCache() {
078            //do nothing
079        }
080    }
081}