package com.metamx.collections.spatial.search;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.primitives.Floats;
import com.metamx.collections.spatial.ImmutableNode;
import com.metamx.collections.spatial.ImmutablePoint;
import java.nio.ByteBuffer;
/**
*/
public class RectangularBound implements Bound
{
private static final byte CACHE_TYPE_ID = 0x0;
private final float[] minCoords;
private final float[] maxCoords;
private final int limit;
private final int numDims;
@JsonCreator
public RectangularBound(
@JsonProperty("minCoords") float[] minCoords,
@JsonProperty("maxCoords") float[] maxCoords,
@JsonProperty("limit") int limit
)
{
Preconditions.checkArgument(minCoords.length == maxCoords.length);
this.numDims = minCoords.length;
this.minCoords = minCoords;
this.maxCoords = maxCoords;
this.limit = limit;
}
public RectangularBound(
float[] minCoords,
float[] maxCoords
)
{
this(minCoords, maxCoords, 0);
}
@JsonProperty
public float[] getMinCoords()
{
return minCoords;
}
@JsonProperty
public float[] getMaxCoords()
{
return maxCoords;
}
@JsonProperty
public int getLimit()
{
return limit;
}
@Override
public int getNumDims()
{
return numDims;
}
@Override
public boolean overlaps(ImmutableNode node)
{
final float[] nodeMinCoords = node.getMinCoordinates();
final float[] nodeMaxCoords = node.getMaxCoordinates();
for (int i = 0; i < numDims; i++) {
if (nodeMaxCoords[i] < minCoords[i] || nodeMinCoords[i] > maxCoords[i]) {
return false;
}
}
return true;
}
@Override
public boolean contains(float[] coords)
{
for (int i = 0; i < numDims; i++) {
if (coords[i] < minCoords[i] || coords[i] > maxCoords[i]) {
return false;
}
}
return true;
}
@Override
public Iterable<ImmutablePoint> filter(Iterable<ImmutablePoint> points)
{
return Iterables.filter(
points,
new Predicate<ImmutablePoint>()
{
@Override
public boolean apply(ImmutablePoint immutablePoint)
{
return contains(immutablePoint.getCoords());
}
}
);
}
@Override
public byte[] getCacheKey()
{
ByteBuffer minCoordsBuffer = ByteBuffer.allocate(minCoords.length * Floats.BYTES);
minCoordsBuffer.asFloatBuffer().put(minCoords);
final byte[] minCoordsCacheKey = minCoordsBuffer.array();
ByteBuffer maxCoordsBuffer = ByteBuffer.allocate(maxCoords.length * Floats.BYTES);
maxCoordsBuffer.asFloatBuffer().put(maxCoords);
final byte[] maxCoordsCacheKey = maxCoordsBuffer.array();
final ByteBuffer cacheKey = ByteBuffer.allocate(1 + minCoordsCacheKey.length + maxCoordsCacheKey.length)
.put(minCoordsCacheKey)
.put(maxCoordsCacheKey)
.put(CACHE_TYPE_ID);
return cacheKey.array();
}
}