/*
* (C) Copyright 2017 Pantheon Technologies, s.r.o. and others.
*
* 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.opendaylight.yangtools.triemap;
import static com.google.common.base.Preconditions.checkNotNull;
import java.util.AbstractSet;
import java.util.Map.Entry;
/**
* Abstract base class for implementing {@link TrieMap} entry sets.
*
* @author Robert Varga
*
* @param <K> the type of entry keys
* @param <V> the type of entry values
*/
abstract class AbstractEntrySet<K, V> extends AbstractSet<Entry<K, V>> {
private final TrieMap<K, V> map;
AbstractEntrySet(final TrieMap<K, V> map) {
this.map = checkNotNull(map);
}
final TrieMap<K, V> map() {
return map;
}
@Override
public final boolean contains(final Object o) {
if (!(o instanceof Entry)) {
return false;
}
final Entry<?, ?> e = (Entry<?, ?>) o;
final Object key = e.getKey();
if (key == null) {
return false;
}
final V v = map.get(key);
return v != null && v.equals(e.getValue());
}
@Override
public final int size() {
return map.size();
}
}