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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.Closeable;
import java.io.Flushable;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.ArrayList;
import java.util.List;
import crosby.binary.Osmformat.PrimitiveGroup;
import crosby.binary.file.BlockOutputStream;
import crosby.binary.file.FileBlock;
/**
* Generic serializer common code
*
* Serialize a set of blobs and process them. Subclasses implement handlers for
* different API's (osmosis, mkgmap, splitter, etc.)
*
* All data is converted into PrimGroupWriterInterface objects, which are then
* ordered to process their data at the appropriate time.
* */
public class BinarySerializer implements Closeable, Flushable {
/**
* Interface used to write a group of primitives. One of these for each
* group type (Node, Way, Relation, DenseNode, Changeset)
*/
protected interface PrimGroupWriterInterface {
/** This callback is invoked on each group that is going into the fileblock in order to give it a chance to
* add to the stringtable pool of strings. */
public void addStringsToStringtable();
/**
* This callback is invoked to request that the primgroup serialize itself into the given protocol buffer object.
*/
public Osmformat.PrimitiveGroup serialize();
}
/** Set the granularity (precision of lat/lon, measured in unites of nanodegrees. */
public void configGranularity(int granularity) {
this.granularity = granularity;
}
/** Set whether metadata is to be omitted */
public void configOmit(boolean omit_metadata) {
this.omit_metadata = omit_metadata;
}
/** Configure the maximum number of entities in a batch */
public void configBatchLimit(int batch_limit) {
this.batch_limit = batch_limit;
}
// Parameters affecting the output size.
protected final int MIN_DENSE = 10;
protected int batch_limit = 4000;
// Parameters affecting the output.
protected int granularity = 100;
protected int date_granularity = 1000;
protected boolean omit_metadata = false;
/** How many primitives have been seen in this batch */
protected int batch_size = 0;
protected int total_entities = 0;
private final StringTable stringtable = new StringTable();
protected List<PrimGroupWriterInterface> groups = new ArrayList<>();
protected BlockOutputStream output;
public BinarySerializer(BlockOutputStream output) {
this.output = output;
}
public StringTable getStringTable() {
return stringtable;
}
@Override
public void flush() throws IOException {
processBatch();
output.flush();
}
@Override
public void close() throws IOException {
flush();
output.close();
}
long debug_bytes = 0;
public void processBatch() {
// System.out.format("Batch of %d groups: ",groups.size());
if (groups.size() == 0)
return;
Osmformat.PrimitiveBlock.Builder primblock = Osmformat.PrimitiveBlock
.newBuilder();
stringtable.clear();
// Preprocessing: Figure out the stringtable.
for (PrimGroupWriterInterface i : groups)
i.addStringsToStringtable();
stringtable.finish();
// Now, start serializing.
for (PrimGroupWriterInterface i : groups) {
PrimitiveGroup group = i.serialize();
if (group != null)
primblock.addPrimitivegroup(group);
}
primblock.setStringtable(stringtable.serialize());
primblock.setGranularity(this.granularity);
primblock.setDateGranularity(this.date_granularity);
// Only generate data with offset (0,0)
//
Osmformat.PrimitiveBlock message = primblock.build();
// System.out.println(message);
debug_bytes += message.getSerializedSize();
// if (message.getSerializedSize() > 1000000)
// System.out.println(message);
try {
output.write(FileBlock.newInstance("OSMData", message
.toByteString(), null));
} catch (IOException e) {
throw new UncheckedIOException(e);
} finally {
batch_size = 0;
groups.clear();
}
// System.out.format("\n");
}
/** Convert from a degrees represented as a double into the serialized offset in nanodegrees.. */
public long mapRawDegrees(double degrees) {
return (long) ((degrees / .000000001));
}
/** Convert from a degrees represented as a double into the serialized offset. */
public int mapDegrees(double degrees) {
return (int) ((degrees / .0000001) / (granularity / 100));
}
}
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