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A continuously growing collection of utilities to measure performance, get better diagnostics,
improve performance, or do things more reliably, faster that other open source libraries...
/*
* Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
*
* 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 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Additionally licensed with:
*
* 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.spf4j.ds;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Map;
import javax.annotation.Nullable;
/**
*
* @author zoly
*/
public final class LinkedHashSetEx extends AbstractSet
implements LinkedSet {
private static final Object PRESENT = new Object();
private final LinkedMap map;
public LinkedHashSetEx() {
map = new LinkedHashMapEx<>();
}
public LinkedHashSetEx(final int capacity) {
map = new LinkedHashMapEx<>(capacity);
}
@Override
public Iterator iterator() {
return map.keySet().iterator();
}
@Override
public int size() {
return map.size();
}
@Override
@Nullable
public V getLastValue() {
Map.Entry lastEntry = map.getLastEntry();
if (lastEntry == null) {
return null;
} else {
return lastEntry.getKey();
}
}
@Override
@Nullable
public V pollLastValue() {
Map.Entry lastEntry = map.pollLastEntry();
if (lastEntry == null) {
return null;
} else {
return lastEntry.getKey();
}
}
@Override
public boolean add(final V e) {
return map.put(e, PRESENT) == null;
}
@Override
public boolean contains(final Object o) {
return map.containsKey(o);
}
@Override
public boolean isEmpty() {
return map.isEmpty();
}
}
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