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PathMatcherExample.java
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PathMatcherExample.java
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/*
* Copyright (C) 2017-2024 HERE Europe B.V.
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* License-Filename: LICENSE
*/
package com.here.platform.example.location.java.standalone;
import static java.lang.Double.parseDouble;
import static java.util.stream.StreamSupport.stream;
import com.here.platform.data.client.base.javadsl.BaseClient;
import com.here.platform.data.client.base.javadsl.BaseClientJava;
import com.here.platform.location.core.geospatial.GeoCoordinate;
import com.here.platform.location.core.mapmatching.MatchResult;
import com.here.platform.location.core.mapmatching.NoTransition;
import com.here.platform.location.core.mapmatching.OnRoad;
import com.here.platform.location.core.mapmatching.javadsl.MatchResults;
import com.here.platform.location.core.mapmatching.javadsl.MatchedPath;
import com.here.platform.location.core.mapmatching.javadsl.PathMatcher;
import com.here.platform.location.inmemory.graph.Vertex;
import com.here.platform.location.integration.optimizedmap.OptimizedMap;
import com.here.platform.location.integration.optimizedmap.OptimizedMapLayers;
import com.here.platform.location.integration.optimizedmap.dcl2.javadsl.OptimizedMapCatalog;
import com.here.platform.location.integration.optimizedmap.mapmatching.javadsl.PathMatchers;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Locale;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
public final class PathMatcherExample {
public static void main(final String[] args) throws IOException {
final BaseClient baseClient = BaseClientJava.instance();
try {
final OptimizedMapLayers optimizedMap =
OptimizedMapCatalog.from(OptimizedMap.v2.HRN)
.usingBaseClient(baseClient)
.newInstance()
.version(1293L);
final Stream<GeoCoordinate> trip = loadTripFromCSVResource("/example_berlin_path.csv");
final PathMatcher<GeoCoordinate, Vertex, NoTransition> pathMatcher =
new PathMatchers(optimizedMap).carPathMatcherWithoutTransitions();
final MatchedPath<Vertex, NoTransition> matchedPath =
pathMatcher.matchPath(trip.collect(Collectors.toList()));
matchedPath.results().forEach(r -> System.out.println(format(r)));
} finally {
baseClient.shutdown();
}
}
private static String format(final MatchResult<Vertex> matchResult) {
if (MatchResults.isUnknown(matchResult)) {
return "Not matched";
} else if (MatchResults.isOffRoad(matchResult)) {
return "Matched offroad";
} else {
final OnRoad<Vertex> onRoad = (OnRoad<Vertex>) matchResult;
return String.format(
Locale.ROOT,
"Matched on %s nearest=(%.4f,%.4f) distance=%.1f",
onRoad.elementProjection().getElement(),
onRoad.elementProjection().getNearest().getLatitude(),
onRoad.elementProjection().getNearest().getLongitude(),
onRoad.elementProjection().getDistanceInMeters());
}
}
private static Stream<GeoCoordinate> loadTripFromCSVResource(final String resourcePath)
throws IOException {
final CSVParser parser =
CSVParser.parse(
PathMatcherExample.class.getResourceAsStream(resourcePath),
Charset.defaultCharset(),
CSVFormat.DEFAULT);
return stream(parser.spliterator(), false)
.map(row -> new GeoCoordinate(parseDouble(row.get(0)), parseDouble(row.get(1))));
}
}