/*
* Copyright (C) 2012, 2016 higherfrequencytrading.com
* Copyright (C) 2016 Roman Leventov
*
* 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 <http://www.gnu.org/licenses/>.
*/
package net.openhft.chronicle.map;
import org.jetbrains.annotations.NotNull;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Map;
class ChronicleMapEntrySet<K, V> extends AbstractSet<Map.Entry<K, V>> {
private final AbstractChronicleMap<K, V> map;
public ChronicleMapEntrySet(AbstractChronicleMap<K, V> map) {
this.map = map;
}
@NotNull
public Iterator<Map.Entry<K, V>> iterator() {
return new ChronicleMapIterator.OfEntries<>(map);
}
public final boolean contains(Object o) {
if (!(o instanceof Map.Entry))
return false;
Map.Entry<?, ?> e = (Map.Entry<?, ?>) o;
try {
V v = map.get(e.getKey());
return v != null && v.equals(e.getValue());
} catch (ClassCastException ex) {
return false;
} catch (NullPointerException ex) {
return false;
}
}
public final boolean remove(Object o) {
if (!(o instanceof Map.Entry))
return false;
Map.Entry<?, ?> e = (Map.Entry<?, ?>) o;
try {
Object key = e.getKey();
Object value = e.getValue();
return map.remove(key, value);
} catch (ClassCastException ex) {
return false;
} catch (NullPointerException ex) {
return false;
}
}
public final int size() {
return map.size();
}
public final boolean isEmpty() {
return map.isEmpty();
}
public final void clear() {
map.clear();
}
}