// This software is released into the Public Domain. See copying.txt for details. package com.graphhopper.reader.osm.pbf; import org.openstreetmap.osmosis.osmbinary.Osmformat; import java.util.Date; /** * Manages decoding of the lower level PBF data structures. * <p> * * @author Brett Henderson * <p> */ public class PbfFieldDecoder { private static final double COORDINATE_SCALING_FACTOR = 0.000000001; private String[] strings; private int coordGranularity; private long coordLatitudeOffset; private long coordLongitudeOffset; private int dateGranularity; /** * Creates a new instance. * <p> * * @param primitiveBlock The primitive block containing the fields to be decoded. */ public PbfFieldDecoder(Osmformat.PrimitiveBlock primitiveBlock) { this.coordGranularity = primitiveBlock.getGranularity(); this.coordLatitudeOffset = primitiveBlock.getLatOffset(); this.coordLongitudeOffset = primitiveBlock.getLonOffset(); this.dateGranularity = primitiveBlock.getDateGranularity(); Osmformat.StringTable stringTable = primitiveBlock.getStringtable(); strings = new String[stringTable.getSCount()]; for (int i = 0; i < strings.length; i++) { strings[i] = stringTable.getS(i).toStringUtf8(); } } /** * Decodes a raw latitude value into degrees. * <p> * * @param rawLatitude The PBF encoded value. * @return The latitude in degrees. */ public double decodeLatitude(long rawLatitude) { return COORDINATE_SCALING_FACTOR * (coordLatitudeOffset + (coordGranularity * rawLatitude)); } /** * Decodes a raw longitude value into degrees. * <p> * * @param rawLongitude The PBF encoded value. * @return The longitude in degrees. */ public double decodeLongitude(long rawLongitude) { return COORDINATE_SCALING_FACTOR * (coordLongitudeOffset + (coordGranularity * rawLongitude)); } /** * Decodes a raw timestamp value into a Date. * <p> * * @param rawTimestamp The PBF encoded timestamp. * @return The timestamp as a Date. */ public Date decodeTimestamp(long rawTimestamp) { return new Date(dateGranularity * rawTimestamp); } /** * Decodes a raw string into a String. * <p> * * @param rawString The PBF encoding string. * @return The string as a String. */ public String decodeString(int rawString) { return strings[rawString]; } }