plusone-commons/src/main/java/xyz/zhouxy/plusone/commons/util/AbstractMapWrapper.java

package xyz.zhouxy.plusone.commons.util;

import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.Set;
import java.util.function.Consumer;
import java.util.function.Function;

import javax.annotation.Nullable;

import com.google.common.annotations.Beta;

@Beta
public abstract class AbstractMapWrapper<K, V, T extends AbstractMapWrapper<K, V, T>> {

    private final Map<K, V> map;
    private final Consumer<K> keyChecker;
    private final Consumer<V> valueChecker;

    protected AbstractMapWrapper(Map<K, V> map, @Nullable Consumer<K> keyChecker, @Nullable Consumer<V> valueChecker) {
        this.map = map;
        this.keyChecker = keyChecker;
        this.valueChecker = valueChecker;
    }

    public final T put(K key, V value) {
        if (this.keyChecker != null) {
            this.keyChecker.accept(key);
        }
        if (this.valueChecker != null) {
            this.valueChecker.accept(value);
        }
        this.map.put(key, value);
        return getSelf();
    }

    public final T putAll(Map<? extends K, ? extends V> m) {
        for (Entry<? extends K, ? extends V> entry : m.entrySet()) {
            put(entry.getKey(), entry.getValue());
        }
        return getSelf();
    }

    public final Optional<V> get(K key) {
        if (this.map.containsKey(key)) {
            return Optional.ofNullable(this.map.get(key));
        }
        throw new IllegalArgumentException("Key does not exist");
    }

    @SuppressWarnings("unchecked")
    public final <R> Optional<R> getAndConvert(K key) {
        return get(key).map(v -> (R) v);
    }

    public final <R> Optional<R> getAndConvert(K key, Function<V, R> mapper) {
        return get(key).map(mapper);
    }

    public final boolean containsKey(Object key) {
        return this.map.containsKey(key);
    }

    public final int size() {
        return this.map.size();
    }

    public final Set<K> keySet() {
        return this.map.keySet();
    }

    public final Collection<V> values() {
        return this.map.values();
    }

    public final Set<Entry<K, V>> entrySet() {
        return this.map.entrySet();
    }

    public final void clear() {
        this.map.clear();
    }

    public final boolean containsValue(Object value) {
        return this.map.containsValue(value);
    }

    public final boolean isEmpty() {
        return this.map.isEmpty();
    }

    public final V remove(Object key) {
        return this.map.remove(key);
    }

    public final Map<K, V> exportMap() {
        return this.map;
    }

    public final Map<K, V> exportUnmodifiableMapMap() {
        return Collections.unmodifiableMap(this.map);
    }

    protected abstract T getSelf();
}