com.metamx.collections.spatial.search.RadiusBound.java Source code

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Here is the source code for com.metamx.collections.spatial.search.RadiusBound.java

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/*
 * Copyright 2011 - 2015 Metamarkets Group Inc.
 *
 * 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 com.metamx.collections.spatial.search;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.metamx.collections.spatial.ImmutablePoint;

/**
 */
public class RadiusBound extends RectangularBound {
    private static float[] getMinCoords(float[] coords, float radius) {
        float[] retVal = new float[coords.length];
        for (int i = 0; i < coords.length; i++) {
            retVal[i] = coords[i] - radius;
        }
        return retVal;
    }

    private static float[] getMaxCoords(float[] coords, float radius) {
        float[] retVal = new float[coords.length];
        for (int i = 0; i < coords.length; i++) {
            retVal[i] = coords[i] + radius;
        }
        return retVal;
    }

    private final float[] coords;
    private final float radius;

    @JsonCreator
    public RadiusBound(@JsonProperty("coords") float[] coords, @JsonProperty("radius") float radius,
            @JsonProperty("limit") int limit) {
        super(getMinCoords(coords, radius), getMaxCoords(coords, radius), limit);

        this.coords = coords;
        this.radius = radius;
    }

    public RadiusBound(float[] coords, float radius) {
        this(coords, radius, 0);
    }

    @JsonProperty
    public float[] getCoords() {
        return coords;
    }

    @JsonProperty
    public float getRadius() {
        return radius;
    }

    @Override
    public boolean contains(float[] otherCoords) {
        double total = 0.0;
        for (int i = 0; i < coords.length; i++) {
            total += Math.pow(otherCoords[i] - coords[i], 2);
        }

        return (total <= Math.pow(radius, 2));
    }

    @Override
    public Iterable<ImmutablePoint> filter(Iterable<ImmutablePoint> points) {
        return Iterables.filter(points, new Predicate<ImmutablePoint>() {
            @Override
            public boolean apply(ImmutablePoint point) {
                return contains(point.getCoords());
            }
        });
    }
}