io.druid.segment.incremental.SpatialDimensionRowFormatter.java Source code

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Here is the source code for io.druid.segment.incremental.SpatialDimensionRowFormatter.java

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/*
 * Druid - a distributed column store.
 * Copyright (C) 2012, 2013  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package io.druid.segment.incremental;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Predicate;
import com.google.common.base.Splitter;
import com.google.common.base.Throwables;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.google.common.primitives.Floats;
import com.metamx.common.ISE;
import com.metamx.common.parsers.ParseException;
import io.druid.data.input.InputRow;
import io.druid.data.input.Row;
import io.druid.data.input.impl.SpatialDimensionSchema;
import org.joda.time.DateTime;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * We throw away all invalid spatial dimensions
 */
public class SpatialDimensionRowFormatter {
    private static final Joiner JOINER = Joiner.on(",");
    private static final Splitter SPLITTER = Splitter.on(",");

    private final Map<String, SpatialDimensionSchema> spatialDimensionMap;
    private final Set<String> spatialPartialDimNames;

    public SpatialDimensionRowFormatter(List<SpatialDimensionSchema> spatialDimensions) {
        this.spatialDimensionMap = Maps.newHashMap();
        for (SpatialDimensionSchema spatialDimension : spatialDimensions) {
            if (this.spatialDimensionMap.put(spatialDimension.getDimName(), spatialDimension) != null) {
                throw new ISE("Duplicate spatial dimension names found! Check your schema yo!");
            }
        }
        this.spatialPartialDimNames = Sets.newHashSet(Iterables
                .concat(Lists.transform(spatialDimensions, new Function<SpatialDimensionSchema, List<String>>() {
                    @Override
                    public List<String> apply(SpatialDimensionSchema input) {
                        return input.getDims();
                    }
                })));
    }

    public InputRow formatRow(final InputRow row) {
        final Map<String, List<String>> spatialLookup = Maps.newHashMap();

        // remove all spatial dimensions
        final List<String> finalDims = Lists
                .newArrayList(Iterables.filter(Lists.transform(row.getDimensions(), new Function<String, String>() {
                    @Override
                    public String apply(String input) {
                        return input.toLowerCase();
                    }
                }), new Predicate<String>() {
                    @Override
                    public boolean apply(String input) {
                        return !spatialDimensionMap.containsKey(input) && !spatialPartialDimNames.contains(input);
                    }
                }));

        InputRow retVal = new InputRow() {
            @Override
            public List<String> getDimensions() {
                return finalDims;
            }

            @Override
            public long getTimestampFromEpoch() {
                return row.getTimestampFromEpoch();
            }

            @Override
            public DateTime getTimestamp() {
                return row.getTimestamp();
            }

            @Override
            public List<String> getDimension(String dimension) {
                List<String> retVal = spatialLookup.get(dimension);
                return (retVal == null) ? row.getDimension(dimension) : retVal;
            }

            @Override
            public Object getRaw(String dimension) {
                return row.getRaw(dimension);
            }

            @Override
            public float getFloatMetric(String metric) {
                try {
                    return row.getFloatMetric(metric);
                } catch (ParseException e) {
                    throw Throwables.propagate(e);
                }
            }

            @Override
            public String toString() {
                return row.toString();
            }

            @Override
            public int compareTo(Row o) {
                return getTimestamp().compareTo(o.getTimestamp());
            }
        };

        for (Map.Entry<String, SpatialDimensionSchema> entry : spatialDimensionMap.entrySet()) {
            final String spatialDimName = entry.getKey();
            final SpatialDimensionSchema spatialDim = entry.getValue();

            List<String> dimVals = row.getDimension(spatialDimName);
            if (dimVals != null && !dimVals.isEmpty()) {
                if (dimVals.size() != 1) {
                    throw new ISE("Spatial dimension value must be in an array!");
                }
                if (isJoinedSpatialDimValValid(dimVals.get(0))) {
                    spatialLookup.put(spatialDimName, dimVals);
                    finalDims.add(spatialDimName);
                }
            } else {
                List<String> spatialDimVals = Lists.newArrayList();
                for (String dim : spatialDim.getDims()) {
                    List<String> partialDimVals = row.getDimension(dim);
                    if (isSpatialDimValsValid(partialDimVals)) {
                        spatialDimVals.addAll(partialDimVals);
                    }
                }

                if (spatialDimVals.size() == spatialDim.getDims().size()) {
                    spatialLookup.put(spatialDimName, Arrays.asList(JOINER.join(spatialDimVals)));
                    finalDims.add(spatialDimName);
                }
            }
        }

        return retVal;
    }

    private boolean isSpatialDimValsValid(List<String> dimVals) {
        if (dimVals == null || dimVals.isEmpty()) {
            return false;
        }
        for (String dimVal : dimVals) {
            if (Floats.tryParse(dimVal) == null) {
                return false;
            }
        }
        return true;
    }

    private boolean isJoinedSpatialDimValValid(String dimVal) {
        if (dimVal == null || dimVal.isEmpty()) {
            return false;
        }
        Iterable<String> dimVals = SPLITTER.split(dimVal);
        for (String val : dimVals) {
            if (Floats.tryParse(val) == null) {
                return false;
            }
        }
        return true;
    }
}