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