/*
* Copyright 2011-2014 the original author or authors.
*
* 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.
*/
package org.springframework.data.mongodb.core.query;
import java.util.Arrays;
import org.springframework.data.domain.Pageable;
import org.springframework.data.geo.CustomMetric;
import org.springframework.data.geo.Distance;
import org.springframework.data.geo.Metric;
import org.springframework.data.geo.Metrics;
import org.springframework.data.geo.Point;
import org.springframework.util.Assert;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
/**
* Builder class to build near-queries.
*
* @author Oliver Gierke
* @author Thomas Darimont
* @author Christoph Strobl
*/
public final class NearQuery {
private final Point point;
private Query query;
private Distance maxDistance;
private Metric metric;
private boolean spherical;
private Integer num;
private Integer skip;
/**
* Creates a new {@link NearQuery}.
*
* @param point
*/
private NearQuery(Point point, Metric metric) {
Assert.notNull(point);
this.point = point;
this.spherical = false;
if (metric != null) {
in(metric);
}
}
/**
* Creates a new {@link NearQuery} starting near the given coordinates.
*
* @param i
* @param j
* @return
*/
public static NearQuery near(double x, double y) {
return near(x, y, null);
}
/**
* Creates a new {@link NearQuery} starting at the given coordinates using the given {@link Metric} to adapt given
* values to further configuration. E.g. setting a {@link #maxDistance(double)} will be interpreted as a value of the
* initially set {@link Metric}.
*
* @param x
* @param y
* @param metric
* @return
*/
public static NearQuery near(double x, double y, Metric metric) {
return near(new Point(x, y), metric);
}
/**
* Creates a new {@link NearQuery} starting at the given {@link Point}.
*
* @param point must not be {@literal null}.
* @return
*/
public static NearQuery near(Point point) {
return near(point, null);
}
/**
* Creates a {@link NearQuery} starting near the given {@link Point} using the given {@link Metric} to adapt given
* values to further configuration. E.g. setting a {@link #maxDistance(double)} will be interpreted as a value of the
* initially set {@link Metric}.
*
* @param point must not be {@literal null}.
* @param metric
* @return
*/
public static NearQuery near(Point point, Metric metric) {
Assert.notNull(point);
return new NearQuery(point, metric);
}
/**
* Returns the {@link Metric} underlying the actual query. If no metric was set explicitly {@link Metrics#NEUTRAL}
* will be returned.
*
* @return will never be {@literal null}.
*/
public Metric getMetric() {
return metric == null ? Metrics.NEUTRAL : metric;
}
/**
* Configures the maximum number of results to return.
*
* @param num
* @return
*/
public NearQuery num(int num) {
this.num = num;
return this;
}
/**
* Configures the number of results to skip.
*
* @param skip
* @return
*/
public NearQuery skip(int skip) {
this.skip = skip;
return this;
}
/**
* Configures the {@link Pageable} to use.
*
* @param pageable must not be {@literal null}
* @return
*/
public NearQuery with(Pageable pageable) {
Assert.notNull(pageable, "Pageable must not be 'null'.");
this.num = pageable.getOffset() + pageable.getPageSize();
this.skip = pageable.getOffset();
return this;
}
/**
* Sets the max distance results shall have from the configured origin. If a {@link Metric} was set before the given
* value will be interpreted as being a value in that metric. E.g.
*
* <pre>
* NearQuery query = near(10.0, 20.0, Metrics.KILOMETERS).maxDistance(150);
* </pre>
*
* Will set the maximum distance to 150 kilometers.
*
* @param maxDistance
* @return
*/
public NearQuery maxDistance(double maxDistance) {
return maxDistance(new Distance(maxDistance, getMetric()));
}
/**
* Sets the maximum distance supplied in a given metric. Will normalize the distance but not reconfigure the query's
* result {@link Metric} if one was configured before.
*
* @param maxDistance
* @param metric must not be {@literal null}.
* @return
*/
public NearQuery maxDistance(double maxDistance, Metric metric) {
Assert.notNull(metric);
return maxDistance(new Distance(maxDistance, metric));
}
/**
* Sets the maximum distance to the given {@link Distance}. Will set the returned {@link Metric} to be the one of the
* given {@link Distance} if no {@link Metric} was set before.
*
* @param distance must not be {@literal null}.
* @return
*/
public NearQuery maxDistance(Distance distance) {
Assert.notNull(distance);
if (distance.getMetric() != Metrics.NEUTRAL) {
this.spherical(true);
}
if (this.metric == null) {
in(distance.getMetric());
}
this.maxDistance = distance;
return this;
}
/**
* Returns the maximum {@link Distance}.
*
* @return
*/
public Distance getMaxDistance() {
return this.maxDistance;
}
/**
* Configures a {@link CustomMetric} with the given multiplier.
*
* @param distanceMultiplier
* @return
*/
public NearQuery distanceMultiplier(double distanceMultiplier) {
this.metric = new CustomMetric(distanceMultiplier);
return this;
}
/**
* Configures the distance multiplier to the multiplier of the given {@link Metric}.
*
* @deprecated use {@link #in(Metric)} instead.
* @param metric must not be {@literal null}.
* @return
*/
@Deprecated
public NearQuery distanceMultiplier(Metric metric) {
Assert.notNull(metric);
return in(metric);
}
/**
* Configures whether to return spherical values for the actual distance.
*
* @param spherical
* @return
*/
public NearQuery spherical(boolean spherical) {
this.spherical = spherical;
return this;
}
/**
* Returns whether spharical values will be returned.
*
* @return
*/
public boolean isSpherical() {
return this.spherical;
}
/**
* Will cause the results' distances being returned in kilometers. Sets {@link #distanceMultiplier(double)} and
* {@link #spherical(boolean)} accordingly.
*
* @return
*/
public NearQuery inKilometers() {
return adaptMetric(Metrics.KILOMETERS);
}
/**
* Will cause the results' distances being returned in miles. Sets {@link #distanceMultiplier(double)} and
* {@link #spherical(boolean)} accordingly.
*
* @return
*/
public NearQuery inMiles() {
return adaptMetric(Metrics.MILES);
}
/**
* Will cause the results' distances being returned in the given metric. Sets {@link #distanceMultiplier(double)}
* accordingly as well as {@link #spherical(boolean)} if the given {@link Metric} is not {@link Metrics#NEUTRAL}.
*
* @param metric the metric the results shall be returned in. Uses {@link Metrics#NEUTRAL} if {@literal null} is
* passed.
* @return
*/
public NearQuery in(Metric metric) {
return adaptMetric(metric == null ? Metrics.NEUTRAL : metric);
}
/**
* Configures the given {@link Metric} to be used as base on for this query and recalculate the maximum distance if no
* metric was set before.
*
* @param metric
*/
private NearQuery adaptMetric(Metric metric) {
if (metric != Metrics.NEUTRAL) {
spherical(true);
}
this.metric = metric;
return this;
}
/**
* Adds an actual query to the {@link NearQuery} to restrict the objects considered for the actual near operation.
*
* @param query must not be {@literal null}.
* @return
*/
public NearQuery query(Query query) {
Assert.notNull(query, "Cannot apply 'null' query on NearQuery.");
this.query = query;
this.skip = query.getSkip();
if (query.getLimit() != 0) {
this.num = query.getLimit();
}
return this;
}
/**
* @return the number of elements to skip.
*/
public Integer getSkip() {
return skip;
}
/**
* Returns the {@link DBObject} built by the {@link NearQuery}.
*
* @return
*/
public DBObject toDBObject() {
BasicDBObject dbObject = new BasicDBObject();
if (query != null) {
dbObject.put("query", query.getQueryObject());
}
if (maxDistance != null) {
dbObject.put("maxDistance", this.maxDistance.getNormalizedValue());
}
if (metric != null) {
dbObject.put("distanceMultiplier", metric.getMultiplier());
}
if (num != null) {
dbObject.put("num", num);
}
dbObject.put("near", Arrays.asList(point.getX(), point.getY()));
dbObject.put("spherical", spherical);
return dbObject;
}
}