hazelcast-master/hazelcast/src/main/java/com/hazelcast/map/impl/query/QueryResultCollection.java
/*
 * Copyright (c) 2008-2023, Hazelcast, Inc. 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.map.impl.query;

import com.hazelcast.internal.serialization.SerializationService;
import com.hazelcast.internal.util.IterationType;

import java.util.AbstractSet;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.function.Predicate;

public class QueryResultCollection<E> extends AbstractSet<E> {

    private final Collection<QueryResultRow> rows;
    private final SerializationService serializationService;
    private final IterationType iterationType;
    private final boolean binary;

    public QueryResultCollection(SerializationService serializationService,
                                 IterationType iterationType,
                                 boolean binary,
                                 boolean distinct,
                                 QueryResult queryResult) {
        this.serializationService = serializationService;
        this.iterationType = iterationType;
        this.binary = binary;
        if (distinct) {
            // convert to a set
            this.rows = new HashSet<>(queryResult.getRows());
        } else {
            // reuse the existing underlying list
            this.rows = queryResult.getRows();
        }
    }

    // just for testing
    Collection<QueryResultRow> getRows() {
        return rows;
    }

    public IterationType getIterationType() {
        return iterationType;
    }

    @Override
    public Iterator<E> iterator() {
        return new QueryResultIterator(rows.iterator(), iterationType, binary, serializationService);
    }

    @Override
    public int size() {
        return rows.size();
    }

    @Override
    public boolean addAll(Collection<? extends E> c) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean remove(Object o) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean removeAll(Collection<?> c) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean removeIf(Predicate<? super E> filter) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean retainAll(Collection<?> coll) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void clear() {
        throw new UnsupportedOperationException();
    }
}
