/*
 * Copyright (c) 2008-2012, Hazel Bilisim Ltd. All Rights Reserved.
 *
 * 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 com.hazelcast.query;

import com.hazelcast.core.MapEntry;
import com.hazelcast.impl.Record;

import java.util.AbstractSet;
import java.util.HashSet;
import java.util.Iterator;
import java.util.concurrent.ConcurrentMap;

public class SingleResultSet extends AbstractSet<MapEntry> {
    private final ConcurrentMap<Long, ? extends MapEntry> records;

    public SingleResultSet(ConcurrentMap<Long, Record> records) {
        this.records = records;
    }

    @Override
    public boolean contains(Object mapEntry) {
        return records != null && records.containsKey(((Record) mapEntry).getId());
    }

    @Override
    public Iterator<MapEntry> iterator() {
        if (records == null) {
            return new HashSet<MapEntry>().iterator();
        } else {
            return (Iterator<MapEntry>) records.values().iterator();
        }
    }

    @Override
    public int size() {
        return (records == null) ? 0 : records.size();
    }
}