/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.ignite.internal.util.lang.gridfunc;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.apache.ignite.internal.util.GridSerializableMap;
import org.apache.ignite.internal.util.GridSerializableSet;
import org.apache.ignite.internal.util.lang.GridFunc;
import org.apache.ignite.internal.util.typedef.F;
import org.apache.ignite.lang.IgnitePredicate;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* Light-weight view on given map with provided predicate.
*
* @param <K> Type of the key.
* @param <V> Type of the value.
*/
public class PredicateMapView<K, V> extends GridSerializableMap<K, V> {
/** */
private static final long serialVersionUID = 5531745605372387948L;
/** */
private final Map<K, V> map;
/** */
private final IgnitePredicate<? super K>[] preds;
/** Entry predicate. */
private IgnitePredicate<Entry<K, V>> entryPred;
/**
* @param map Input map that serves as a base for the view.
* @param preds Optional predicates. If predicates are not provided - all will be in the view.
*/
@SuppressWarnings({"unchecked"})
public PredicateMapView(Map<K, V> map, IgnitePredicate<? super K>... preds) {
this.map = map;
this.preds = preds;
this.entryPred = new EntryByKeyEvaluationPredicate(preds);
}
/** {@inheritDoc} */
@NotNull @Override public Set<Entry<K, V>> entrySet() {
return new GridSerializableSet<Entry<K, V>>() {
@NotNull
@Override public Iterator<Entry<K, V>> iterator() {
return GridFunc.iterator0(map.entrySet(), false, entryPred);
}
@Override public int size() {
return F.size(map.keySet(), preds);
}
@SuppressWarnings({"unchecked"})
@Override public boolean remove(Object o) {
return F.isAll((Entry<K, V>)o, entryPred) && map.entrySet().remove(o);
}
@SuppressWarnings({"unchecked"})
@Override public boolean contains(Object o) {
return F.isAll((Entry<K, V>)o, entryPred) && map.entrySet().contains(o);
}
@Override public boolean isEmpty() {
return !iterator().hasNext();
}
};
}
/** {@inheritDoc} */
@Override public boolean isEmpty() {
return entrySet().isEmpty();
}
/** {@inheritDoc} */
@SuppressWarnings({"unchecked"})
@Nullable @Override public V get(Object key) {
return GridFunc.isAll((K)key, preds) ? map.get(key) : null;
}
/** {@inheritDoc} */
@Nullable @Override public V put(K key, V val) {
V oldVal = get(key);
if (GridFunc.isAll(key, preds))
map.put(key, val);
return oldVal;
}
/** {@inheritDoc} */
@SuppressWarnings({"unchecked"})
@Override public boolean containsKey(Object key) {
return GridFunc.isAll((K)key, preds) && map.containsKey(key);
}
}