io.druid.query.search.SearchStrategy.java Source code

Introduction

Here is the source code for io.druid.query.search.SearchStrategy.java

Source

/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.query.search;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import io.druid.collections.bitmap.BitmapFactory;
import io.druid.collections.bitmap.ConciseBitmapFactory;
import io.druid.collections.bitmap.RoaringBitmapFactory;
import io.druid.java.util.common.IAE;
import io.druid.query.Druids;
import io.druid.query.dimension.DimensionSpec;
import io.druid.query.filter.Filter;
import io.druid.segment.QueryableIndex;
import io.druid.segment.Segment;
import io.druid.segment.data.Indexed;
import io.druid.segment.filter.Filters;
import org.joda.time.Interval;

import java.util.List;

public abstract class SearchStrategy {
    protected final Filter filter;
    protected final Interval interval;

    protected SearchStrategy(SearchQuery query) {
        this.filter = Filters.convertToCNFFromQueryContext(query, Filters.toFilter(query.getDimensionsFilter()));
        final List<Interval> intervals = query.getQuerySegmentSpec().getIntervals();
        if (intervals.size() != 1) {
            throw new IAE("Should only have one interval, got[%s]", intervals);
        }
        this.interval = intervals.get(0);
    }

    public abstract List<SearchQueryExecutor> getExecutionPlan(SearchQuery query, Segment segment);

    public SearchQueryDecisionHelper getDecisionHelper(QueryableIndex index) {
        final BitmapFactory bitmapFactory = index.getBitmapFactoryForDimensions();
        if (bitmapFactory.getClass().equals(ConciseBitmapFactory.class)) {
            return ConciseBitmapDecisionHelper.instance();
        } else if (bitmapFactory.getClass().equals(RoaringBitmapFactory.class)) {
            return RoaringBitmapDecisionHelper.instance();
        } else {
            throw new IAE("Unknown bitmap type[%s]", bitmapFactory.getClass().getCanonicalName());
        }
    }

    static List<DimensionSpec> getDimsToSearch(Indexed<String> availableDimensions,
            List<DimensionSpec> dimensions) {
        if (dimensions == null || dimensions.isEmpty()) {
            return ImmutableList.copyOf(Iterables.transform(availableDimensions, Druids.DIMENSION_IDENTITY));
        } else {
            return dimensions;
        }
    }
}