org.jboss.weld.util.collections.SetMultimap Maven / Gradle / Ivy
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* 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 java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.jboss.weld.util.Supplier;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* A {@link Multimap} whose collections of values are backed by a {@link Set}.
*
* @author Martin Kouba
*
* @param The key type
* @param The value type
*/
public class SetMultimap extends AbstractMultimap> {
private static final long serialVersionUID = -7310409235342796148L;
/**
* Creates a new instance backed by a {@link HashMap} and {@link HashSet}.
*/
public static SetMultimap newSetMultimap() {
return new SetMultimap(new Supplier>>() {
@Override
public HashMap> get() {
return new HashMap>();
}
}, null,
new Supplier>() {
@Override
public HashSet get() {
return new HashSet();
}
}, null);
}
/**
* Creates a new instance backed by a {@link HashMap} and {@link HashSet}. All key-value mappings are copied from the input multimap. If any
* collection of values in the input multimap contains duplicate elements, these are removed in the constructed multimap.
*
* @param multimap
*/
public static SetMultimap newSetMultimap(Multimap multimap) {
return new SetMultimap(new Supplier>>() {
@Override
public HashMap> get() {
return new HashMap>();
}
}, null,
new Supplier>() {
@Override
public HashSet get() {
return new HashSet();
}
}, multimap);
}
/**
* Creates a new instance backed by a {@link ConcurrentHashMap} and synchronized {@link HashSet}.
*/
public static SetMultimap newConcurrentSetMultimap() {
return newConcurrentSetMultimap(new Supplier>() {
@Override
public Set get() {
return Collections.synchronizedSet(new HashSet());
}
});
}
/**
* Creates a new instance backed by a {@link ConcurrentHashMap} and synchronized {@link HashSet}.
*/
public static SetMultimap newConcurrentSetMultimap(Supplier> valueSupplier) {
return new SetMultimap(null, new Supplier>>() {
@Override
public ConcurrentMap> get() {
return new ConcurrentHashMap>();
}
}, valueSupplier, null);
}
/**
*
* @param mapSupplier
* @param collectionSupplier
* @param multimap
*/
private SetMultimap(Supplier>> mapSupplier, Supplier>> concurrentMapSupplier, Supplier> collectionSupplier, Multimap multimap) {
super(mapSupplier, concurrentMapSupplier, collectionSupplier, multimap);
}
}