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.example.util.mvp.noop;

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

import static java.util.Collections.unmodifiableMap;

/**
 * Helper class for default type values used by {@link com.hannesdorfmann.mosby.mvp.NoOp}.
 *
 * @author Jens Dirller, taken from Mosby project (https://github.com/sockeqwe/mosby).
 * @since 1.2.0
 */
@SuppressWarnings("PMD.AvoidUsingShortType")
final class Defaults {

    private static final Map<Class<?>, Object> DEFAULTS_MAP = 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_MAP.get(type);
    }

}