/*

* Copyright (c) [2016] [ <ether.camp> ]

* This file is part of the ethereumJ library.

*

* The ethereumJ library 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, or

* (at your option) any later version.

*

* The ethereumJ library 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 the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.

*/

package org.tron.utils;

import java.util.Collection;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

public class SetAdapter<E> implements Set<E> {

private static final Object DummyValue = new Object();

Map<E, Object> delegate;

public SetAdapter(Map<E, ?> delegate) {

this.delegate = (Map<E, Object>) delegate;

}

@Override

public int size() {

return delegate.size();

}

@Override

public boolean isEmpty() {

return delegate.isEmpty();

}

@Override

public boolean contains(Object o) {

return delegate.containsKey(o);

}

@Override

public Iterator<E> iterator() {

return delegate.keySet().iterator();

}

@Override

public Object[] toArray() {

return delegate.keySet().toArray();

}

@Override

public <T> T[] toArray(T[] a) {

return delegate.keySet().toArray(a);

}

@Override

public boolean add(E e) {

return delegate.put(e, DummyValue) == null;

}

@Override

public boolean remove(Object o) {

return delegate.remove(o) != null;

}

@Override

public boolean containsAll(Collection<?> c) {

return delegate.keySet().containsAll(c);

}

@Override

public boolean addAll(Collection<? extends E> c) {

boolean ret = false;

for (E e : c) {

ret |= add(e);

}

return ret;

}

@Override

public boolean retainAll(Collection<?> c) {

throw new RuntimeException("Not implemented"); // TODO add later if required

}

@Override

public boolean removeAll(Collection<?> c) {

boolean ret = false;

for (Object e : c) {

ret |= remove(e);

}

return ret;

}

@Override

public void clear() {

delegate.clear();

}

}