Current File : //home/waritko/yacy/source/net/yacy/cora/storage/SizeLimitedSet.java
/**
* SizeLimitedSet
* Copyright 2012 by Michael Peter Christen, mc@yacy.net, Frankfurt a. M., Germany
* First released 04.07.2012 at http://yacy.net
*
* This 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 2.1 of the License, or (at your option) any later version.
*
* This 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 this program in the file lgpl21.txt
* If not, see <http://www.gnu.org/licenses/>.
*/
package net.yacy.cora.storage;
import java.io.Serializable;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Set;
public class SizeLimitedSet<E> extends AbstractSet<E> implements Set<E>, Cloneable, Serializable {
private static final long serialVersionUID = -1674392695322189500L;
private transient SizeLimitedMap<E,Object> map;
private static final Object OBJECT = new Object();
public SizeLimitedSet(int sizeLimit) {
map = new SizeLimitedMap<E,Object>(sizeLimit);
}
@Override
public Iterator<E> iterator() {
return map.keySet().iterator();
}
@Override
public int size() {
return map.size();
}
@Override
public boolean isEmpty() {
return map.isEmpty();
}
@Override
public boolean contains(Object o) {
return map.containsKey(o);
}
@Override
public boolean add(E e) {
return map.put(e, OBJECT) == null;
}
@Override
public boolean remove(Object o) {
return map.remove(o) == OBJECT;
}
@Override
public void clear() {
map.clear();
}
/**
* @return true when the size limit has been exceeded at least one time
*/
public boolean isLimitExceeded() {
return this.map.isLimitExceeded();
}
@Override
@SuppressWarnings("unchecked")
public Object clone() {
try {
SizeLimitedSet<E> n = (SizeLimitedSet<E>) super.clone();
n.map = (SizeLimitedMap<E, Object>) map.clone();
return n;
} catch (final CloneNotSupportedException e) {
throw new InternalError();
}
}
}
Mini Shell