Lazy.java

/*
 * Copyright 2010 Gal Dolber.
 * 
 * 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 com.guit.client.gin;

import com.google.inject.Inject;
import com.google.inject.Provider;

/**
 * Lazy provider of a single instance.
 */
public class Lazy<T> {

  @Inject
  Provider<T> provider;

  private T instance;

  public T get() {
    if (instance == null) {
      instance = provider.get();
    }
    return instance;
  }
}