Defaults.java

/*
 *  Copyright 2015. Hannes Dorfmann.
 *
 * 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.hannesdorfmann.mosby3.mvp;

import java.util.HashMap;
import java.util.Map;

import static java.util.Collections.unmodifiableMap;

/**
 * Helper class for default type values used by {@link NoOp}
 * @author Jens Dirller
 * @since 1.2.0
 */
final class Defaults {

  private static final Map<Class<?>, Object> DEFAULTS =
      unmodifiableMap(new HashMap<Class<?>, Object>() {
        {
          put(Boolean.TYPE, false);
          put(Byte.TYPE, (byte) 0);
          put(Character.TYPE, '\000');
          put(Double.TYPE, 0.0d);
          put(Float.TYPE, 0.0f);
          put(Integer.TYPE, 0);
          put(Long.TYPE, 0L);
          put(Short.TYPE, (short) 0);
        }
      });

  private Defaults() {
    // no instances
  }

  @SuppressWarnings("unchecked")
  public static <T> T defaultValue(Class<T> type) {
    return (T) DEFAULTS.get(type);
  }
}