/*
 * 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.nifi.hl7.query.result;

import org.apache.nifi.hl7.query.QueryResult;
import org.apache.nifi.hl7.query.ResultHit;
import org.apache.nifi.hl7.query.Selection;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class StandardQueryResult implements QueryResult {

    private final List<Selection> selections;
    private final Set<Map<String, Object>> hits;
    private final Iterator<Map<String, Object>> hitIterator;

    public StandardQueryResult(final List<Selection> selections, final Set<Map<String, Object>> hits) {
        this.selections = selections;
        this.hits = hits;

        hitIterator = hits.iterator();
    }

    @Override
    public boolean isMatch() {
        return !hits.isEmpty();
    }

    @Override
    public List<String> getLabels() {
        final List<String> labels = new ArrayList<>();
        for (final Selection selection : selections) {
            labels.add(selection.getName());
        }
        return labels;
    }

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

    @Override
    public ResultHit nextHit() {
        if (hitIterator.hasNext()) {
            return new StandardResultHit(hitIterator.next());
        } else {
            return null;
        }
    }

}
