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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.onosproject.persistence.impl;
import com.google.common.collect.Iterators;
import org.mapdb.DB;
import org.mapdb.Hasher;
import org.mapdb.Serializer;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* A set implementation that gets and receives all data from a serialized internal set.
*/
//TODO add locking for reads and writes
public class PersistentSet<E> implements Set<E> {
private final org.onosproject.store.service.Serializer serializer;
private final org.mapdb.DB database;
private final Set<byte[]> items;
private final String name;
public PersistentSet(org.onosproject.store.service.Serializer serializer, DB database, String name) {
this.serializer = checkNotNull(serializer);
this.database = checkNotNull(database);
this.name = checkNotNull(name);
items = database
.createHashSet(name)
.serializer(Serializer.BYTE_ARRAY)
.hasher(Hasher.BYTE_ARRAY)
.makeOrGet();
}
public void readInto(Set<E> items) {
this.items.forEach(item -> items.add(serializer.decode(item)));
}
@Override
public int size() {
return items.size();
}
@Override
public boolean isEmpty() {
return items.isEmpty();
}
@Override
public boolean contains(Object o) {
checkNotNull(o, "The argument cannot be null");
return items.contains(serializer.encode(o));
}
@Override
public Iterator<E> iterator() {
return Iterators.transform(items.iterator(), serializer::decode);
}
@Override
public Object[] toArray() {
Object[] retArray = new Object[items.size()];
int index = 0;
Iterator<byte[]> iterator = items.iterator();
while (iterator.hasNext()) {
retArray[index] = serializer.decode(iterator.next());
index++;
}
return retArray;
}
@Override
public <T> T[] toArray(T[] a) {
checkNotNull(a, "The passed in array cannot be null.");
int index = 0;
Iterator<byte[]> iterator = items.iterator();
T[] retArray;
if (a.length >= items.size()) {
retArray = a;
} else {
retArray = (T[]) new Object[items.size()];
}
while (iterator.hasNext()) {
retArray[index++] = serializer.decode(iterator.next());
}
if (retArray.length > items.size()) {
retArray[index] = null;
}
return retArray;
}
@Override
public boolean add(E item) {
checkNotNull("Item to be added cannot be null.");
return items.add(serializer.encode(item));
}
@Override
public boolean remove(Object o) {
checkNotNull(o, "Item to be removed cannot be null.");
return items.remove(serializer.encode(o));
}
@Override
public boolean containsAll(Collection<?> c) {
checkNotNull(c, "Collection cannot be internal.");
for (Object item : c) {
if (!items.contains(serializer.encode(item))) {
return false;
}
}
return true;
}
@Override
public boolean addAll(Collection<? extends E> c) {
checkNotNull(c, "The collection to be added cannot be null.");
boolean changed = false;
for (Object item : c) {
changed = items.add(serializer.encode(item)) || changed;
}
return changed;
}
@Override
public boolean retainAll(Collection<?> c) {
boolean changed = false;
for (byte[] item : items) {
E deserialized = serializer.decode(item);
if (!c.contains(deserialized)) {
changed = items.remove(item) || changed;
}
}
return changed;
}
@Override
public boolean removeAll(Collection<?> c) {
boolean changed = false;
for (Object item : c) {
changed = items.remove(serializer.encode(item)) || changed;
}
return changed;
}
@Override
public void clear() {
items.clear();
}
@Override
public boolean equals(Object set) {
//This is not threadsafe and on larger sets incurs a significant processing cost
if (!(set instanceof Set)) {
return false;
}
Set asSet = (Set) set;
if (asSet.size() != this.size()) {
return false;
}
for (Object item : this) {
if (!asSet.contains(item)) {
return false;
}
}
return true;
}
@Override
public int hashCode() {
return super.hashCode();
}
}
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