com.metamx.collections.spatial.search.RadiusBound Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bytebuffer-collections Show documentation

ByteBuffer Collections

There is a newer version: 0.4.1-mmx

Show newest version

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