ch.ralscha.extdirectspring.util.ApiCache Maven / Gradle / Ivy

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/**
 * Copyright 2010-2012 Ralph Schaer 
 *
 * 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 ch.ralscha.extdirectspring.util;

import java.lang.ref.SoftReference;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author Ralph Schaer
 */
public enum ApiCache {

	/**
	 * Singleton enum pattern
	 */
	INSTANCE;

	private final Map> cache;

	private ApiCache() {
		cache = new ConcurrentHashMap>();
	}

	public void put(ApiCacheKey key, String apiString) {
		cache.put(key, new SoftReference(apiString));
	}

	public String get(ApiCacheKey key) {
		if (key != null) {
			SoftReference apiStringReference = cache.get(key);
			if (apiStringReference != null && apiStringReference.get() != null) {
				return apiStringReference.get();
			}
		}
		return null;
	}

	/**
	 * for unit tests
	 */
	public void clear() {
		cache.clear();
	}
}