/**
* Licensed to jclouds, Inc. (jclouds) under one or more
* contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. jclouds 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
*
* 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.jclouds.util;
import static com.google.common.base.Preconditions.checkNotNull;
import java.util.Map.Entry;
import java.util.Set;
import com.google.common.base.Function;
import com.google.common.base.Predicates;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableMultimap.Builder;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
/**
*
* @author Adrian Cole
*/
public class Multimaps2 {
public static <K, V> Multimap<K, V> replaceValue(Multimap<K, V> fromMultimap, final K key, final V value) {
checkNotNull(fromMultimap, "input multimap");
checkNotNull(key, "key");
checkNotNull(value, "value");
return ImmutableMultimap.<K, V>builder()
.putAll(withoutKey(fromMultimap, key))
.put(key, value).build();
}
public static <K, V> Multimap<K, V> replaceEntries(Multimap<K, V> fromMultimap, Multimap<K, V> updates) {
checkNotNull(fromMultimap, "input multimap");
checkNotNull(updates, "updates");
return ImmutableMultimap.<K, V>builder()
.putAll(withoutKeys(fromMultimap, updates.keySet()))
.putAll(updates).build();
}
public static <K, V> Multimap<K, V> withoutKey(Multimap<K, V> fromMultimap, K key) {
return Multimaps.<K, V> filterKeys(fromMultimap, Predicates.not(Predicates.equalTo(key)));
}
public static <K, V> Multimap<K, V> withoutKeys(Multimap<K, V> fromMultimap, Set<K> keys) {
return Multimaps.<K, V> filterKeys(fromMultimap, Predicates.not(Predicates.in(keys)));
}
/**
* change the keys but keep the values in-tact.
*
* @param <K1>
* input key type
* @param <K2>
* output key type
* @param <V>
* value type
* @param in
* input map to transform
* @param fn
* how to transform the values
* @return immutableMap with the new keys.
*/
public static <K1, K2, V> Multimap<K2, V> transformKeys(Multimap<K1, V> in, Function<K1, K2> fn) {
checkNotNull(in, "input map");
checkNotNull(fn, "function");
Builder<K2, V> returnVal = ImmutableMultimap.builder();
for (Entry<K1, V> entry : in.entries())
returnVal.put(fn.apply(entry.getKey()), entry.getValue());
return returnVal.build();
}
}