Alachisoft.NCache.Common.DataReader.DistributedOrderedRSEnumerator Maven / Gradle / Ivy

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package Alachisoft.NCache.Common.DataReader;

import Alachisoft.NCache.Common.Queries.OrderByArgument;

import java.util.ArrayList;
import java.util.HashMap;

//  Copyright (c) 2020 Alachisoft
//  
//  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

public class DistributedOrderedRSEnumerator extends DistributedRSEnumerator {
    protected ArrayList _orderByArguments;

    public DistributedOrderedRSEnumerator(ArrayList partitionRecordSets, ArrayList orderByArguments, HashMap> validReaders) {
        super(partitionRecordSets, validReaders);
        _orderByArguments = orderByArguments;

        ArrayList emprtEnumeratorsList = new ArrayList();
        for (RecordSetEnumerator rse : super._partitionRecordSets) {
            if (!rse.moveNext()) {
                emprtEnumeratorsList.add(rse);
            }
        }

        for (RecordSetEnumerator rse : emprtEnumeratorsList) {
            _partitionRecordSets.remove(rse);
            removeFromValidReaders(rse);
        }

    }

    @Override
    public boolean moveNext() {
        if (_partitionRecordSets.size() == 0) {
            return false;
        }
        RecordSetEnumerator rse = _partitionRecordSets.get(0);
        _current = _partitionRecordSets.get(0).getCurrent();
        for (RecordSetEnumerator rs : _partitionRecordSets) {
            if (_current.compareOrder(rs.getCurrent(), _orderByArguments) > 0) {
                _current = rs.getCurrent();
                rse = rs;
            }
        }
        if (!rse.moveNext()) {
            _partitionRecordSets.remove(rse);
            removeFromValidReaders(rse);
        }
        if (_current == null) {
            return false;
        }
        return true;
    }
}