001/**
002 * Copyright 2010-2014 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.common.util.properties;
017
018import java.util.Properties;
019
020import org.kuali.common.util.Assert;
021import org.kuali.common.util.cache.Cache;
022import org.kuali.common.util.property.ImmutableProperties;
023
024public final class CachingLoader implements PropertiesLoader {
025
026        private final Cache<String, Properties> cache;
027        private final LocationLoader loader;
028
029        public CachingLoader(Location location, Cache<String, Properties> cache) {
030                this(location, location.getValue(), cache);
031        }
032
033        public CachingLoader(Location location, String value, Cache<String, Properties> cache) {
034                Assert.noNulls(cache);
035                this.cache = cache;
036                this.loader = new LocationLoader(location, value);
037        }
038
039        @Override
040        public Properties load() {
041
042                if (!loader.getLocation().isCacheable()) {
043                        return loader.load();
044                }
045
046                Properties properties = cache.get(loader.getValue());
047                if (properties == null) {
048                        properties = new ImmutableProperties(loader.load());
049                        this.cache.put(loader.getValue(), properties);
050                }
051                return properties;
052
053        }
054
055}