| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.gossip.crdt; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.LinkedHashSet; |
| import java.util.Set; |
| |
| public class GrowOnlySet<ElementType> implements CrdtSet<ElementType, Set<ElementType>, GrowOnlySet<ElementType>>{ |
| |
| private final Set<ElementType> hidden = new LinkedHashSet<>(); |
| |
| @SuppressWarnings("unused") |
| /* |
| * Used by SerDe |
| */ |
| private GrowOnlySet(){ |
| |
| } |
| |
| public GrowOnlySet(Set<ElementType> c){ |
| hidden.addAll(c); |
| } |
| |
| public GrowOnlySet(Collection<ElementType> c){ |
| hidden.addAll(c); |
| } |
| |
| public GrowOnlySet(GrowOnlySet<ElementType> first, GrowOnlySet<ElementType> second){ |
| hidden.addAll(first.value()); |
| hidden.addAll(second.value()); |
| } |
| |
| @Override |
| public GrowOnlySet<ElementType> merge(GrowOnlySet<ElementType> other) { |
| return new GrowOnlySet<>(this, other); |
| } |
| |
| @Override |
| public Set<ElementType> value() { |
| Set<ElementType> copy = new LinkedHashSet<>(); |
| copy.addAll(hidden); |
| return Collections.unmodifiableSet(copy); |
| } |
| |
| @Override |
| public GrowOnlySet<ElementType> optimize() { |
| return new GrowOnlySet<>(hidden); |
| } |
| |
| public int size() { |
| return hidden.size(); |
| } |
| |
| public boolean isEmpty() { |
| return hidden.isEmpty(); |
| } |
| |
| public boolean contains(Object o) { |
| return hidden.contains(o); |
| } |
| |
| public Iterator<ElementType> iterator() { |
| Set<ElementType> copy = new HashSet<>(); |
| copy.addAll(hidden); |
| return copy.iterator(); |
| } |
| |
| public Object[] toArray() { |
| return hidden.toArray(); |
| } |
| |
| public <T> T[] toArray(T[] a) { |
| return hidden.toArray(a); |
| } |
| |
| public boolean add(ElementType e) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean remove(Object o) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean containsAll(Collection<?> c) { |
| return hidden.containsAll(c); |
| } |
| |
| public boolean addAll(Collection<? extends ElementType> c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean retainAll(Collection<?> c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean removeAll(Collection<?> c) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void clear() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public String toString() { |
| return "GrowOnlySet [hidden=" + hidden + "]"; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + ((hidden == null) ? 0 : hidden.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| @SuppressWarnings("rawtypes") |
| GrowOnlySet other = (GrowOnlySet) obj; |
| if (hidden == null) { |
| if (other.hidden != null) |
| return false; |
| } else if (!hidden.equals(other.hidden)) |
| return false; |
| return true; |
| } |
| |
| Set<ElementType> getElements(){ |
| return hidden; |
| } |
| } |