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/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.elasticsearch.index.mapper.geo;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.index.FieldInfo;
import org.apache.lucene.spatial.prefix.PrefixTreeStrategy;
import org.apache.lucene.spatial.prefix.RecursivePrefixTreeStrategy;
import org.apache.lucene.spatial.prefix.TermQueryPrefixTreeStrategy;
import org.apache.lucene.spatial.prefix.tree.GeohashPrefixTree;
import org.apache.lucene.spatial.prefix.tree.QuadPrefixTree;
import org.apache.lucene.spatial.prefix.tree.SpatialPrefixTree;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.geo.GeoJSONShapeParser;
import org.elasticsearch.common.geo.GeoShapeConstants;
import org.elasticsearch.common.geo.GeoUtils;
import org.elasticsearch.common.geo.SpatialStrategy;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.index.codec.postingsformat.PostingsFormatProvider;
import org.elasticsearch.index.fielddata.FieldDataType;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.Mapper;
import org.elasticsearch.index.mapper.MapperParsingException;
import org.elasticsearch.index.mapper.ParseContext;
import org.elasticsearch.index.mapper.core.AbstractFieldMapper;
import com.spatial4j.core.shape.Shape;
import java.io.IOException;
import java.util.Map;
/**
* FieldMapper for indexing {@link com.spatial4j.core.shape.Shape}s.
*
* Currently Shapes can only be indexed and can only be queried using
* {@link org.elasticsearch.index.query.GeoShapeFilterParser}, consequently
* a lot of behavior in this Mapper is disabled.
*
* Format supported:
*
* "field" : {
* "type" : "polygon",
* "coordinates" : [
* [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0] ]
* ]
* }
*/
public class GeoShapeFieldMapper extends AbstractFieldMapper {
public static final String CONTENT_TYPE = "geo_shape";
public static class Names {
public static final String TREE = "tree";
public static final String TREE_GEOHASH = "geohash";
public static final String TREE_QUADTREE = "quadtree";
public static final String TREE_LEVELS = "tree_levels";
public static final String TREE_PRESISION = "precision";
public static final String DISTANCE_ERROR_PCT = "distance_error_pct";
public static final String STRATEGY = "strategy";
}
public static class Defaults {
public static final String TREE = Names.TREE_GEOHASH;
public static final String STRATEGY = SpatialStrategy.RECURSIVE.getStrategyName();
public static final int GEOHASH_LEVELS = GeoUtils.geoHashLevelsForPrecision("50m");
public static final int QUADTREE_LEVELS = GeoUtils.quadTreeLevelsForPrecision("50m");
public static final double DISTANCE_ERROR_PCT = 0.025d;
public static final FieldType FIELD_TYPE = new FieldType();
static {
FIELD_TYPE.setIndexed(true);
FIELD_TYPE.setTokenized(false);
FIELD_TYPE.setStored(false);
FIELD_TYPE.setStoreTermVectors(false);
FIELD_TYPE.setOmitNorms(true);
FIELD_TYPE.setIndexOptions(FieldInfo.IndexOptions.DOCS_ONLY);
FIELD_TYPE.freeze();
}
}
public static class Builder extends AbstractFieldMapper.Builder {
private String tree = Defaults.TREE;
private String strategyName = Defaults.STRATEGY;
private int treeLevels = 0;
private double precisionInMeters = -1;
private double distanceErrorPct = Defaults.DISTANCE_ERROR_PCT;
private SpatialPrefixTree prefixTree;
public Builder(String name) {
super(name, new FieldType(Defaults.FIELD_TYPE));
}
public Builder tree(String tree) {
this.tree = tree;
return this;
}
public Builder strategy(String strategy) {
this.strategyName = strategy;
return this;
}
public Builder treeLevelsByDistance(double meters) {
this.precisionInMeters = meters;
return this;
}
public Builder treeLevels(int treeLevels) {
this.treeLevels = treeLevels;
return this;
}
public Builder distanceErrorPct(double distanceErrorPct) {
this.distanceErrorPct = distanceErrorPct;
return this;
}
@Override
public GeoShapeFieldMapper build(BuilderContext context) {
final FieldMapper.Names names = buildNames(context);
if (Names.TREE_GEOHASH.equals(tree)) {
prefixTree = new GeohashPrefixTree(GeoShapeConstants.SPATIAL_CONTEXT, getLevels(treeLevels, precisionInMeters, Defaults.GEOHASH_LEVELS, true));
} else if (Names.TREE_QUADTREE.equals(tree)) {
prefixTree = new QuadPrefixTree(GeoShapeConstants.SPATIAL_CONTEXT, getLevels(treeLevels, precisionInMeters, Defaults.QUADTREE_LEVELS, false));
} else {
throw new ElasticSearchIllegalArgumentException("Unknown prefix tree type [" + tree + "]");
}
return new GeoShapeFieldMapper(names, prefixTree, strategyName, distanceErrorPct, fieldType, provider);
}
}
private static final int getLevels(int treeLevels, double precisionInMeters, int defaultLevels, boolean geoHash) {
if (treeLevels > 0 || precisionInMeters >= 0) {
return Math.max(treeLevels, precisionInMeters >= 0 ? (geoHash ? GeoUtils.geoHashLevelsForPrecision(precisionInMeters)
: GeoUtils.quadTreeLevelsForPrecision(precisionInMeters)) : 0);
}
return defaultLevels;
}
public static class TypeParser implements Mapper.TypeParser {
@Override
public Mapper.Builder parse(String name, Map node, ParserContext parserContext) throws MapperParsingException {
Builder builder = new Builder(name);
for (Map.Entry entry : node.entrySet()) {
String fieldName = Strings.toUnderscoreCase(entry.getKey());
Object fieldNode = entry.getValue();
if (Names.TREE.equals(fieldName)) {
builder.tree(fieldNode.toString());
} else if (Names.TREE_LEVELS.equals(fieldName)) {
builder.treeLevels(Integer.parseInt(fieldNode.toString()));
} else if (Names.TREE_PRESISION.equals(fieldName)) {
builder.treeLevelsByDistance(DistanceUnit.parse(fieldNode.toString(), DistanceUnit.METERS, DistanceUnit.METERS));
} else if (Names.DISTANCE_ERROR_PCT.equals(fieldName)) {
builder.distanceErrorPct(Double.parseDouble(fieldNode.toString()));
} else if (Names.STRATEGY.equals(fieldName)) {
builder.strategy(fieldNode.toString());
}
}
return builder;
}
}
private final PrefixTreeStrategy defaultStrategy;
private final RecursivePrefixTreeStrategy recursiveStrategy;
private final TermQueryPrefixTreeStrategy termStrategy;
public GeoShapeFieldMapper(FieldMapper.Names names, SpatialPrefixTree tree, String defaultStrategyName, double distanceErrorPct,
FieldType fieldType, PostingsFormatProvider provider) {
super(names, 1, fieldType, null, null, provider, null, null);
this.recursiveStrategy = new RecursivePrefixTreeStrategy(tree, names.indexName());
this.recursiveStrategy.setDistErrPct(distanceErrorPct);
this.termStrategy = new TermQueryPrefixTreeStrategy(tree, names.indexName());
this.termStrategy.setDistErrPct(distanceErrorPct);
this.defaultStrategy = resolveStrategy(defaultStrategyName);
}
@Override
public FieldType defaultFieldType() {
return Defaults.FIELD_TYPE;
}
@Override
public FieldDataType defaultFieldDataType() {
return null;
}
@Override
public void parse(ParseContext context) throws IOException {
try {
Shape shape = GeoJSONShapeParser.parse(context.parser());
Field[] fields = defaultStrategy.createIndexableFields(shape);
if (fields == null || fields.length == 0) {
return;
}
for (Field field : fields) {
if (!customBoost()) {
field.setBoost(boost);
}
if (context.listener().beforeFieldAdded(this, field, context)) {
context.doc().add(field);
}
}
} catch (Exception e) {
throw new MapperParsingException("failed to parse [" + names.fullName() + "]", e);
}
}
@Override
protected Field parseCreateField(ParseContext context) throws IOException {
return null;
}
@Override
protected void doXContentBody(XContentBuilder builder) throws IOException {
builder.field("type", contentType());
// TODO: Come up with a better way to get the name, maybe pass it from builder
if (defaultStrategy.getGrid() instanceof GeohashPrefixTree) {
// Don't emit the tree name since GeohashPrefixTree is the default
// Only emit the tree levels if it isn't the default value
if (defaultStrategy.getGrid().getMaxLevels() != Defaults.GEOHASH_LEVELS) {
builder.field(Names.TREE_LEVELS, defaultStrategy.getGrid().getMaxLevels());
}
} else {
builder.field(Names.TREE, Names.TREE_QUADTREE);
if (defaultStrategy.getGrid().getMaxLevels() != Defaults.QUADTREE_LEVELS) {
builder.field(Names.TREE_LEVELS, defaultStrategy.getGrid().getMaxLevels());
}
}
if (defaultStrategy.getDistErrPct() != Defaults.DISTANCE_ERROR_PCT) {
builder.field(Names.DISTANCE_ERROR_PCT, defaultStrategy.getDistErrPct());
}
}
@Override
protected String contentType() {
return CONTENT_TYPE;
}
@Override
public String value(Object value) {
throw new UnsupportedOperationException("GeoShape fields cannot be converted to String values");
}
public PrefixTreeStrategy defaultStrategy() {
return this.defaultStrategy;
}
public PrefixTreeStrategy recursiveStrategy() {
return this.recursiveStrategy;
}
public PrefixTreeStrategy termStrategy() {
return this.termStrategy;
}
public PrefixTreeStrategy resolveStrategy(String strategyName) {
if (SpatialStrategy.RECURSIVE.getStrategyName().equals(strategyName)) {
return recursiveStrategy;
}
if (SpatialStrategy.TERM.getStrategyName().equals(strategyName)) {
return termStrategy;
}
throw new ElasticSearchIllegalArgumentException("Unknown prefix tree strategy [" + strategyName + "]");
}
}
