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/** Copyright (c) 2010 Scott A. Crosby. <scott@sacrosby.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package crosby.binary;
import java.io.UncheckedIOException;
import java.util.Date;
import java.util.List;
import com.google.protobuf.InvalidProtocolBufferException;
import crosby.binary.file.BlockReaderAdapter;
import crosby.binary.file.FileBlock;
import crosby.binary.file.FileBlockPosition;
import crosby.binary.file.FileFormatException;
public abstract class BinaryParser implements BlockReaderAdapter {
protected int granularity;
private long lat_offset;
private long lon_offset;
protected int date_granularity;
private String[] strings;
/** Take a Info protocol buffer containing a date and convert it into a java Date object */
protected Date getDate(Osmformat.Info info) {
if (info.hasTimestamp()) {
return new Date(date_granularity * info.getTimestamp());
} else
return NODATE;
}
public static final Date NODATE = new Date(-1);
/** Get a string based on the index used.
*
* Index 0 is reserved to use as a delimiter, therefore, index 1 corresponds to the first string in the table
* @param id the index
* @return the string at the given index
*/
protected String getStringById(int id) {
return strings[id];
}
@Override
public void handleBlock(FileBlock message) {
try {
if (message.getType().equals("OSMHeader")) {
Osmformat.HeaderBlock headerblock = Osmformat.HeaderBlock
.parseFrom(message.getData());
parse(headerblock);
} else if (message.getType().equals("OSMData")) {
Osmformat.PrimitiveBlock primblock = Osmformat.PrimitiveBlock
.parseFrom(message.getData());
parse(primblock);
}
} catch (InvalidProtocolBufferException e) {
throw new UncheckedIOException(new FileFormatException(e));
}
}
@Override
public boolean skipBlock(FileBlockPosition block) {
// System.out.println("Seeing block of type: "+block.getType());
if (block.getType().equals("OSMData"))
return false;
if (block.getType().equals("OSMHeader"))
return false;
System.out.println("Skipped block of type: " + block.getType());
return true;
}
/** Convert a latitude value stored in a protobuf into a double, compensating for granularity and latitude offset */
public double parseLat(long degree) {
// Support non-zero offsets. (We don't currently generate them)
return (granularity * degree + lat_offset) * .000000001;
}
/** Convert a longitude value stored in a protobuf into a double, compensating for granularity and longitude offset */
public double parseLon(long degree) {
// Support non-zero offsets. (We don't currently generate them)
return (granularity * degree + lon_offset) * .000000001;
}
/** Parse a Primitive block (containing a string table, other paramaters, and PrimitiveGroups */
public void parse(Osmformat.PrimitiveBlock block) {
Osmformat.StringTable stablemessage = block.getStringtable();
strings = new String[stablemessage.getSCount()];
for (int i = 0; i < strings.length; i++) {
strings[i] = stablemessage.getS(i).toStringUtf8();
}
granularity = block.getGranularity();
lat_offset = block.getLatOffset();
lon_offset = block.getLonOffset();
date_granularity = block.getDateGranularity();
for (Osmformat.PrimitiveGroup groupmessage : block
.getPrimitivegroupList()) {
// Exactly one of these should trigger on each loop.
parseNodes(groupmessage.getNodesList());
parseWays(groupmessage.getWaysList());
parseRelations(groupmessage.getRelationsList());
if (groupmessage.hasDense())
parseDense(groupmessage.getDense());
}
}
/** Parse a list of Relation protocol buffers and send the resulting relations to a sink. */
protected abstract void parseRelations(List<Osmformat.Relation> rels);
/** Parse a DenseNode protocol buffer and send the resulting nodes to a sink. */
protected abstract void parseDense(Osmformat.DenseNodes nodes);
/** Parse a list of Node protocol buffers and send the resulting nodes to a sink. */
protected abstract void parseNodes(List<Osmformat.Node> nodes);
/** Parse a list of Way protocol buffers and send the resulting ways to a sink. */
protected abstract void parseWays(List<Osmformat.Way> ways);
/** Parse a header message. */
protected abstract void parse(Osmformat.HeaderBlock header);
}
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