content: /**
   * Copyright 2014 Zhenguo Jin
   * <p/>
   * 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
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * 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 com.rsen.github.androidutils;
  
  /**
   * Singleton helper class for lazily initialization.
   *
   * @author jingle1267@163.com
   * @date 2014-9-11
   */
  public abstract class Singleton<T> {
      private T mInstance;
  
      protected abstract T create();
  
      public final T get() {
          synchronized (this) {
              if (mInstance == null) {
                  mInstance = create();
              }
              return mInstance;
          }
      }
  }
  