/*
* JBoss, Home of Professional Open Source
* Copyright 2014, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.jboss.weld.util.collections;
import static org.jboss.weld.util.Preconditions.checkArgumentNotNull;
import java.io.Serializable;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.function.Supplier;
/**
* An abstract {@link Multimap} backed by a {@link Map}.
*
* @author Martin Kouba
*
* @param <K> The key type
* @param <V> The value type
* @param <C> The collection of values type
*/
abstract class AbstractMultimap<K, V, C extends Collection<V>> implements Multimap<K, V>, Serializable {
private static final long serialVersionUID = -8363450390652782067L;
protected final Supplier<C> supplier;
private final Map<K, C> map;
/**
*
* @param mapSupplier
* @param collectionSupplier
* @param multimap
*/
protected AbstractMultimap(Supplier<Map<K, C>> mapSupplier, Supplier<C> collectionSupplier, Multimap<K, V> multimap) {
checkArgumentNotNull(mapSupplier, "mapSupplier");
checkArgumentNotNull(collectionSupplier, "collectionSupplier");
this.supplier = collectionSupplier;
this.map = mapSupplier.get();
if (multimap != null) {
for (Entry<K, Collection<V>> entry : multimap.entrySet()) {
C values = supplier.get();
values.addAll(entry.getValue());
putAll(entry.getKey(), values);
}
}
}
@Override
public int size() {
return map.size();
}
@Override
public boolean isEmpty() {
return map.isEmpty();
}
@Override
public C get(K key) {
return map.computeIfAbsent(key, (k) -> supplier.get());
}
@Override
public boolean put(K key, V value) {
return get(key).add(value);
}
@Override
public boolean putAll(K key, Collection<? extends V> values) {
return get(key).addAll(values);
}
@Override
public C replaceValues(K key, Iterable<? extends V> values) {
C replacement = supplier.get();
Iterables.addAll(replacement, values);
return map.put(key, replacement);
}
@Override
public boolean containsKey(Object key) {
return map.containsKey(key);
}
@Override
public Set<K> keySet() {
return ImmutableSet.copyOf(map.keySet());
}
@Override
public List<V> values() {
return ImmutableList.copyOf(Iterables.concat(map.values()));
}
@Override
public Set<V> uniqueValues() {
ImmutableSet.Builder<V> builder = ImmutableSet.builder();
for (C values : map.values()) {
builder.addAll(values);
}
return builder.build();
}
@Override
public Set<Entry<K, Collection<V>>> entrySet() {
ImmutableSet.Builder<Entry<K, Collection<V>>> builder = ImmutableSet.builder();
for (Entry<K, C> entry : map.entrySet()) {
builder.add(new MultimapEntry<K, Collection<V>>(entry.getKey(), Multimaps.unmodifiableValueCollection(entry.getValue())));
}
return builder.build();
}
@Override
public void clear() {
map.clear();
}
@Override
public String toString() {
return map.toString();
}
/**
*
* @author Martin Kouba
*
* @param <K>
* @param <V>
*/
static class MultimapEntry<K, V> implements Map.Entry<K, V> {
private final K key;
private final V value;
public MultimapEntry(K key, V value) {
this.key = key;
this.value = value;
}
@Override
public K getKey() {
return key;
}
@Override
public V getValue() {
return value;
}
@Override
public V setValue(V value) {
throw new UnsupportedOperationException();
}
@Override
public int hashCode() {
return (key == null ? 0 : key.hashCode()) ^ (value == null ? 0 : value.hashCode());
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof Map.Entry)) {
return false;
}
Map.Entry<?, ?> e = (Map.Entry<?, ?>) o;
return Objects.equals(key, e.getKey()) && Objects.equals(value, e.getValue());
}
@Override
public String toString() {
return key + "=" + value;
}
}
}