net.openhft.chronicle.set.SetFromMap Maven / Gradle / Ivy

Go to download
/*
 *     Copyright (C) 2015  higherfrequencytrading.com
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Lesser General Public License for more details.
 *
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with this program.  If not, see .
 */

package net.openhft.chronicle.set;

import net.openhft.chronicle.map.ChronicleMap;

import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;

import static net.openhft.chronicle.set.DummyValue.DUMMY_VALUE;

class SetFromMap extends AbstractSet
        implements ChronicleSet, Serializable {

    private final ChronicleMap m;  // The backing map
    private transient Set s;       // Its keySet

    SetFromMap(ChronicleMap map) {
        m = map;
        s = map.keySet();
    }

    public void clear() {
        m.clear();
    }

    public int size() {
        return m.size();
    }

    public boolean isEmpty() {
        return m.isEmpty();
    }

    public boolean contains(Object o) {
        return m.containsKey(o);
    }

    public boolean remove(Object o) {
        return m.remove(o, DUMMY_VALUE);
    }

    public boolean add(E e) {
        return m.putIfAbsent(e, DUMMY_VALUE) == null;
    }

    public Iterator iterator() {
        return s.iterator();
    }

    public Object[] toArray() {
        return s.toArray();
    }

    public  T[] toArray(T[] a) {
        return s.toArray(a);
    }

    public String toString() {
        return s.toString();
    }

    public int hashCode() {
        return s.hashCode();
    }

    public boolean equals(Object o) {
        return o == this || s.equals(o);
    }

    // TODO optimize in case of stateless clients -- because bulk ops are optimized on maps
    // but on key set they delegate to individual element queries => individual remote calls
    public boolean containsAll(Collection c) {
        return s.containsAll(c);
    }

    public boolean removeAll(Collection c) {
        return s.removeAll(c);
    }

    public boolean retainAll(Collection c) {
        return s.retainAll(c);
    }
    // addAll is the only inherited implementation

    private static final long serialVersionUID = 2454657854757543876L;

    private void readObject(java.io.ObjectInputStream stream)
            throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        s = m.keySet();
    }

    @Override
    public long longSize() {
        return m.longSize();
    }

    @Override
    public File file() {
        return m.file();
    }

    @Override
    public void close() {
        m.close();
    }
}