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package org.onosproject.store.consistent.impl;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.stream.Collectors;
import org.onosproject.store.service.ConsistentMap;
import org.onosproject.store.service.Versioned;
import com.google.common.collect.Collections2;
import com.google.common.collect.Maps;
/**
* Standard java Map backed by a ConsistentMap.
*
* @param <K> key type
* @param <V> value type
*/
public final class ConsistentMapBackedJavaMap<K, V> implements Map<K, V> {
private final ConsistentMap<K, V> backingMap;
public ConsistentMapBackedJavaMap(ConsistentMap<K, V> backingMap) {
this.backingMap = backingMap;
}
@Override
public int size() {
return backingMap.size();
}
@Override
public boolean isEmpty() {
return backingMap.isEmpty();
}
@Override
public boolean containsKey(Object key) {
return backingMap.containsKey((K) key);
}
@Override
public boolean containsValue(Object value) {
return backingMap.containsValue((V) value);
}
@Override
public V get(Object key) {
return Versioned.valueOrElse(backingMap.get((K) key), null);
}
@Override
public V getOrDefault(Object key, V defaultValue) {
return Versioned.valueOrElse(backingMap.get((K) key), defaultValue);
}
@Override
public V put(K key, V value) {
return Versioned.valueOrElse(backingMap.put(key, value), null);
}
@Override
public V putIfAbsent(K key, V value) {
return Versioned.valueOrElse(backingMap.putIfAbsent(key, value), null);
}
@Override
public V remove(Object key) {
return Versioned.valueOrElse(backingMap.remove((K) key), null);
}
@Override
public boolean remove(Object key, Object value) {
return backingMap.remove((K) key, (V) value);
}
@Override
public V replace(K key, V value) {
throw new UnsupportedOperationException();
}
@Override
public boolean replace(K key, V oldValue, V newValue) {
return backingMap.replace(key, oldValue, newValue);
}
@Override
public void putAll(Map<? extends K, ? extends V> m) {
m.forEach((k, v) -> {
backingMap.put(k, v);
});
}
@Override
public void clear() {
backingMap.clear();
}
@Override
public V compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
return Versioned.valueOrElse(backingMap.compute(key, remappingFunction), null);
}
@Override
public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
return Versioned.valueOrElse(backingMap.computeIfAbsent(key, mappingFunction), null);
}
@Override
public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
return Versioned.valueOrElse(backingMap.computeIfPresent(key, remappingFunction), null);
}
@Override
public Set<K> keySet() {
return backingMap.keySet();
}
@Override
public Collection<V> values() {
return Collections2.transform(backingMap.values(), v -> v.value());
}
@Override
public Set<java.util.Map.Entry<K, V>> entrySet() {
return backingMap.entrySet()
.stream()
.map(entry -> Maps.immutableEntry(entry.getKey(), entry.getValue().value()))
.collect(Collectors.toSet());
}
@Override
public void forEach(BiConsumer<? super K, ? super V> action) {
entrySet().forEach(e -> action.accept(e.getKey(), e.getValue()));
}
@Override
public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
return computeIfPresent(key, (k, v) -> v == null ? value : remappingFunction.apply(v, value));
}
}
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