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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you 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:
 *
 * https://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 io.netty.util.collection;

import java.util.Map;

/**
 * Interface for a primitive map that uses {@code long}s as keys.
 *
 * @param  the value type stored in the map.
 */
public interface LongObjectMap extends Map {

    /**
     * A primitive entry in the map, provided by the iterator from {@link #entries()}
     *
     * @param  the value type stored in the map.
     */
    interface PrimitiveEntry {
        /**
         * Gets the key for this entry.
         */
        long key();

        /**
         * Gets the value for this entry.
         */
        V value();

        /**
         * Sets the value for this entry.
         */
        void setValue(V value);
    }

    /**
     * Gets the value in the map with the specified key.
     *
     * @param key the key whose associated value is to be returned.
     * @return the value or {@code null} if the key was not found in the map.
     */
    V get(long key);

    /**
     * Puts the given entry into the map.
     *
     * @param key the key of the entry.
     * @param value the value of the entry.
     * @return the previous value for this key or {@code null} if there was no previous mapping.
     */
    V put(long key, V value);

    /**
     * Removes the entry with the specified key.
     *
     * @param key the key for the entry to be removed from this map.
     * @return the previous value for the key, or {@code null} if there was no mapping.
     */
    V remove(long key);

    /**
     * Gets an iterable to traverse over the primitive entries contained in this map. As an optimization,
     * the {@link PrimitiveEntry}s returned by the {@link Iterator} may change as the {@link Iterator}
     * progresses. The caller should not rely on {@link PrimitiveEntry} key/value stability.
     */
    Iterable> entries();

    /**
     * Indicates whether or not this map contains a value for the specified key.
     */
    boolean containsKey(long key);
}