EmptyConcurrentMap.java

package com.baasbox.util;

import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.Function;

/**
 * Created by eto on 14/10/14.
 */
public class EmptyConcurrentMap<K,V> implements ConcurrentMap<K,V> {

    @Override
    public int size() {
        return 0;
    }

    @Override
    public boolean isEmpty() {
        return true;
    }

    @Override
    public boolean containsKey(Object key) {
        return false;
    }

    @Override
    public boolean containsValue(Object value) {
        return false;
    }

    @Override
    public V get(Object key) {
        return null;
    }

    @Override
    public V put(K key, V value) {
        return null;
    }

    @Override
    public V remove(Object key) {
        return null;
    }

    @Override
    public void putAll(Map<? extends K, ? extends V> m) {

    }

    @Override
    public void clear() {

    }

    @Override
    public Set<K> keySet() {
        return Collections.emptySet();
    }

    @Override
    public Collection<V> values() {
        return Collections.emptySet();
    }

    @Override
    public Set<Entry<K, V>> entrySet() {
        return Collections.emptySet();
    }

    @Override
    public V getOrDefault(Object key, V defaultValue) {
        return defaultValue;
    }

    @Override
    public void forEach(BiConsumer<? super K, ? super V> action) {

    }

    @Override
    public V putIfAbsent(K key, V value) {
        return null;
    }

    @Override
    public boolean remove(Object key, Object value) {
        return false;
    }

    @Override
    public boolean replace(K key, V oldValue, V newValue) {
        return false;
    }

    @Override
    public V replace(K key, V value) {
        return null;
    }

    @Override
    public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {

    }

    @Override
    public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
        return null;
    }

    @Override
    public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
        return null;
    }

    @Override
    public V compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
        return null;
    }

    @Override
    public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
        return null;
    }
}