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ThingSearchRoute.java
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ThingSearchRoute.java
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/*
* Copyright (c) 2017 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.gateway.service.endpoints.routes.thingsearch;
import java.util.Arrays;
import java.util.EnumMap;
import java.util.List;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.annotation.Nullable;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.gateway.service.endpoints.routes.AbstractRoute;
import org.eclipse.ditto.gateway.service.endpoints.routes.RouteBaseProperties;
import org.eclipse.ditto.thingsearch.model.signals.commands.query.CountThings;
import org.eclipse.ditto.thingsearch.model.signals.commands.query.QueryThings;
import org.apache.pekko.http.javadsl.server.Directives;
import org.apache.pekko.http.javadsl.server.PathMatchers;
import org.apache.pekko.http.javadsl.server.RequestContext;
import org.apache.pekko.http.javadsl.server.Route;
/**
* Builder for creating Pekko HTTP routes for {@code /search/things}.
*/
public final class ThingSearchRoute extends AbstractRoute {
public static final String PATH_SEARCH = "search";
public static final String PATH_THINGS = "things";
private static final String PATH_COUNT = "count";
/**
* Constructs a {@code ThingSearchRoute} object.
*
* @param routeBaseProperties the base properties of the route.
* @throws NullPointerException if {@code routeBaseProperties} is {@code null}.
*/
public ThingSearchRoute(final RouteBaseProperties routeBaseProperties) {
super(routeBaseProperties);
}
/**
* Builds the {@code /search} route.
*
* @return the {@code /search}} route.
*/
public Route buildSearchRoute(final RequestContext ctx, final DittoHeaders dittoHeaders) {
return Directives.rawPathPrefix(PathMatchers.slash().concat(PATH_SEARCH), () ->
Directives.rawPathPrefix(PathMatchers.slash().concat(PATH_THINGS),
() -> // /search/things
concat(
// /search/things/count
path(PATH_COUNT, () -> countThings(ctx, dittoHeaders)),
// /search/things
pathEndOrSingleSlash(() -> searchThings(ctx, dittoHeaders))
)
)
);
}
/*
* Describes {@code /search/things/count} route.
*
* @return {@code /search/things/count} route.
*/
private Route countThings(final RequestContext ctx, final DittoHeaders dittoHeaders) {
// GET things/count?filter=<filterString>&namespaces=<namespacesString>
return get(() -> thingSearchParameterOptional(params -> handlePerRequest(ctx,
CountThings.of(calculateFilter(params.get(ThingSearchParameter.FILTER)),
calculateNamespaces(params.get(ThingSearchParameter.NAMESPACES)),
dittoHeaders))));
}
/*
* Describes {@code /search/things} route.
*
* @return {@code /search/things} route.
*/
private Route searchThings(final RequestContext ctx, final DittoHeaders dittoHeaders) {
// GET things?filter=<filterString>
// &options=<optionsString>
// &fields=<fieldsString>
// &namespaces=<namespacesString>
// &nextPageKey=<nextPageKey>
return get(() -> thingSearchParameterOptional(params -> handlePerRequest(ctx,
QueryThings.of(calculateFilter(params.get(ThingSearchParameter.FILTER)),
calculateOptions(params.get(ThingSearchParameter.OPTION)),
AbstractRoute.calculateSelectedFields(params.get(ThingSearchParameter.FIELDS))
.orElse(null),
calculateNamespaces(params.get(ThingSearchParameter.NAMESPACES)),
dittoHeaders))));
}
private Route thingSearchParameterOptional(
final Function<EnumMap<ThingSearchParameter, List<String>>, Route> inner) {
return thingSearchParameterOptionalImpl(ThingSearchParameter.values(),
new EnumMap<>(ThingSearchParameter.class), inner);
}
private Route thingSearchParameterOptionalImpl(final ThingSearchParameter[] values,
final EnumMap<ThingSearchParameter, List<String>> accumulator,
final Function<EnumMap<ThingSearchParameter, List<String>>, Route> inner) {
if (accumulator.size() >= values.length) {
return inner.apply(accumulator);
} else {
final ThingSearchParameter parameter = values[accumulator.size()];
return parameterList(parameter.toString(), parameterValues -> {
accumulator.put(parameter, parameterValues);
return thingSearchParameterOptionalImpl(values, accumulator, inner);
});
}
}
@Nullable
private static String calculateFilter(final List<String> filterString) {
if (filterString.isEmpty()) {
return null;
}
return filterString.stream()
.collect(Collectors.joining(",", "and(", ")"));
}
@Nullable
public static Set<String> calculateNamespaces(final List<String> namespacesStrings) {
final Function<String, Stream<String>> splitAndRemoveEmpty =
s -> Arrays.stream(s.split(","))
.filter(segment -> !segment.isEmpty());
// if no namespaces are given explicitly via query parameter,
// return null to signify the lack of namespace restriction
if (namespacesStrings.isEmpty()) {
return null;
}
return namespacesStrings.stream()
.flatMap(splitAndRemoveEmpty)
.collect(Collectors.toSet());
}
@Nullable
public static List<String> calculateOptions(final List<String> optionsString) {
if (optionsString.isEmpty()) {
return null;
}
return optionsString
.stream()
.flatMap(s -> Arrays.stream(s.split(",")))
.toList();
}
}