Kontinuation commented on code in PR #12667: URL: https://github.com/apache/iceberg/pull/12667#discussion_r2371531681
########## api/src/main/java/org/apache/iceberg/geospatial/GeospatialBound.java: ########## @@ -0,0 +1,338 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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.apache.iceberg.geospatial; + +import java.io.Serializable; +import java.nio.ByteBuffer; +import java.nio.ByteOrder; +import java.util.Comparator; +import java.util.Objects; + +/** + * Represents a geospatial bound (minimum or maximum) for Iceberg tables. + * + * <p>According to the <a href="https://iceberg.apache.org/spec/#bound-serialization";>Bound + * serialization section of Iceberg Table spec</a>, geospatial bounds are serialized differently + * from the regular WKB representation. Geometry and geography bounds are single point encoded as a + * concatenation of 8-byte little-endian IEEE 754 coordinate values in the order X, Y, Z (optional), + * M (optional). + * + * <p>The encoding varies based on which coordinates are present: + * + * <ul> + * <li>x:y (2 doubles) when both z and m are unset + * <li>x:y:z (3 doubles) when only m is unset + * <li>x:y:NaN:m (4 doubles) when only z is unset + * <li>x:y:z:m (4 doubles) when all coordinates are set + * </ul> + * + * <p>This class represents a lower or upper geospatial bound and handles serialization and + * deserialization of these bounds to/from byte arrays, conforming to the Iceberg specification. + */ +public class GeospatialBound implements Serializable, Comparable<GeospatialBound> { + /** + * Parses a geospatial bound from a byte buffer according to Iceberg spec. + * + * <p>Based on the buffer size, this method determines which coordinates are present: - 16 bytes + * (2 doubles): x and y only - 24 bytes (3 doubles): x, y, and z - 32 bytes (4 doubles): x, y, z + * (might be NaN), and m + * + * <p>The ordinates are encoded as 8-byte little-endian IEEE 754 values. + * + * @param buffer the ByteBuffer containing the serialized geospatial bound + * @return a GeospatialBound object representing the parsed bound + * @throws IllegalArgumentException if the buffer has an invalid size + */ + public static GeospatialBound fromByteBuffer(ByteBuffer buffer) { + // Save original position and byte order to restore them later Review Comment: I have changed this to a `Preconditions.checkArgument` call to follow the convention of variants code. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
