Package org.apache.lucene.document
Class ShapeField
java.lang.Object
org.apache.lucene.document.ShapeField
A base shape utility class used for both LatLon (spherical) and XY (cartesian) shape fields.
Polygon's and Line's are decomposed into a triangular mesh using the Tessellator utility class. Each ShapeField.Triangle is encoded by this base class and indexed as a
seven dimension multi-value field.
Finding all shapes that intersect a range (e.g., bounding box), or target shape, at search time is efficient.
This class defines the static methods for encoding the three vertices of a tessellated triangles as a seven dimension point. The coordinates are converted from double precision values into 32 bit integers so they are sortable at index time.
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic classRepresents a encoded triangle usingdecodeTriangle(byte[], DecodedTriangle).static enumQuery Relation Types *static classpolygons are decomposed into tessellated triangles usingTessellatorthese triangles are encoded and inserted as separate indexed POINT fields -
Field Summary
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Method Summary
Modifier and TypeMethodDescriptionstatic voiddecodeTriangle(byte[] t, ShapeField.DecodedTriangle triangle) Decode a triangle encoded byencodeTriangle(byte[], int, int, boolean, int, int, boolean, int, int, boolean).static voidencodeTriangle(byte[] bytes, int aY, int aX, boolean ab, int bY, int bX, boolean bc, int cY, int cX, boolean ca) A triangle is encoded using 6 points and an extra point with encoded information in three bits of how to reconstruct it.
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Field Details
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TYPE
tessellated triangles are seven dimensions; the first four are the bounding box index dimensions
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Method Details
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encodeTriangle
public static void encodeTriangle(byte[] bytes, int aY, int aX, boolean ab, int bY, int bX, boolean bc, int cY, int cX, boolean ca) A triangle is encoded using 6 points and an extra point with encoded information in three bits of how to reconstruct it. Triangles are encoded with CCW orientation and might be rotated to limit the number of possible reconstructions to 2^3. Reconstruction always happens from west to east. -
decodeTriangle
Decode a triangle encoded byencodeTriangle(byte[], int, int, boolean, int, int, boolean, int, int, boolean).
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