92 lines
1.8 KiB
Java
92 lines
1.8 KiB
Java
package tc.oc.commons.core.collection;
|
|
|
|
import java.util.Collection;
|
|
import java.util.Iterator;
|
|
import java.util.Map;
|
|
import java.util.Set;
|
|
|
|
public class ForwardingSet<E> implements Set<E> {
|
|
|
|
protected final Map<E, ?> backend;
|
|
|
|
public ForwardingSet(Map<E, ?> backend) {
|
|
this.backend = backend;
|
|
}
|
|
|
|
@Override
|
|
public int size() {
|
|
return backend.size();
|
|
}
|
|
|
|
@Override
|
|
public boolean isEmpty() {
|
|
return backend.isEmpty();
|
|
}
|
|
|
|
@Override
|
|
public boolean contains(Object o) {
|
|
return backend.containsKey(o);
|
|
}
|
|
|
|
@Override
|
|
public Iterator<E> iterator() {
|
|
return backend.keySet().iterator();
|
|
}
|
|
|
|
@Override
|
|
public Object[] toArray() {
|
|
return backend.keySet().toArray();
|
|
}
|
|
|
|
@Override
|
|
public <T> T[] toArray(T[] a) {
|
|
return backend.keySet().toArray(a);
|
|
}
|
|
|
|
@Override
|
|
public boolean add(E e) {
|
|
if(backend.containsKey(e)) {
|
|
return false;
|
|
} else {
|
|
backend.put(e, null);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public boolean remove(Object o) {
|
|
if(!backend.containsKey(o)) {
|
|
return false;
|
|
} else {
|
|
backend.remove(o);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public boolean containsAll(Collection<?> c) {
|
|
return c.stream().allMatch(this::contains);
|
|
}
|
|
|
|
@Override
|
|
public boolean addAll(Collection<? extends E> c) {
|
|
return c.stream().anyMatch(this::add);
|
|
}
|
|
|
|
@Override
|
|
public boolean retainAll(Collection<?> c) {
|
|
return c.stream().filter(i -> !contains(i)).anyMatch(this::remove);
|
|
}
|
|
|
|
@Override
|
|
public boolean removeAll(Collection<?> c) {
|
|
return c.stream().anyMatch(this::remove);
|
|
}
|
|
|
|
@Override
|
|
public void clear() {
|
|
backend.clear();
|
|
}
|
|
|
|
}
|