/** Close the underlying Channels. */
@Override
public void close() throws IOException {
try {
if (shpChannel != null && shpChannel.isOpen()) {
shpChannel.close();
}
} finally {
shx.close();
}
shpChannel = null;
handler = null;
shapeBuffer = null;
}
/**
* Write the headers for this shapefile including the bounds, shape type, the number of geometries
* and the total fileLength (in actual bytes, NOT 16 bit words).
*/
public void writeHeaders(
final Envelope bounds,
final ShapeType type,
final int numberOfGeometries,
final int fileLength)
throws IOException {
try {
handler = type.getShapeHandler(true);
} catch (DataStoreException se) {
throw new RuntimeException("unexpected Exception", se);
}
if (shapeBuffer == null) allocateBuffers();
ShapefileHeader.write(
shapeBuffer,
type,
fileLength / 2,
bounds.getMinX(),
bounds.getMinY(),
bounds.getMaxX(),
bounds.getMaxY());
shx.moveToHeaderStart();
shx.writeHeader(
type,
50 + 4 * numberOfGeometries,
bounds.getMinX(),
bounds.getMinY(),
bounds.getMaxX(),
bounds.getMaxY());
offset = 50;
this.type = type;
cnt = 0;
shpChannel.position(0);
drain();
}
/**
* Write a single Geometry to this shapefile. The Geometry must be compatable with the ShapeType
* assigned during the writing of the headers.
*/
public void writeGeometry(final Geometry g) throws IOException {
if (shapeBuffer == null) throw new IOException("Must write headers first");
lp = shapeBuffer.position();
// see doc for handling null geometries
// http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf
int length;
if (g == null) {
length = writeNullGeometry();
} else {
length = writeNonNullGeometry(g);
}
assert (length * 2 == (shapeBuffer.position() - lp) - 8);
lp = shapeBuffer.position();
// write to the shx
shx.writeRecord(offset, length);
offset += length + 4;
drain();
assert (shapeBuffer.position() == 0);
}
/**
* Allocate internal buffers and position the channels to the beginning or the record section of
* the shapefile. The headers MUST be rewritten after this operation, or the file may be
* corrupt...
*/
public void skipHeaders() throws IOException {
if (shapeBuffer == null) allocateBuffers();
shpChannel.position(100);
shx.moveToRecordStart();
}
