/**
* Transfer (by bytes) the data at the current record to the ShapefileWriter.
*
* @param bounds double array of length four for transfering the bounds into
* @return The length of the record transfered in bytes
*/
public int transferTo(ShapefileWriter writer, int recordNum, double[] bounds) throws IOException {
buffer.position(this.toBufferOffset(record.end));
buffer.order(ByteOrder.BIG_ENDIAN);
buffer.getInt(); // record number
int rl = buffer.getInt();
int mark = buffer.position();
int len = rl * 2;
buffer.order(ByteOrder.LITTLE_ENDIAN);
ShapeType recordType = ShapeType.forID(buffer.getInt());
if (recordType.isMultiPoint()) {
for (int i = 0; i < 4; i++) {
bounds[i] = buffer.getDouble();
}
} else if (recordType != ShapeType.NULL) {
bounds[0] = bounds[1] = buffer.getDouble();
bounds[2] = bounds[3] = buffer.getDouble();
}
// write header to shp and shx
headerTransfer.position(0);
headerTransfer.putInt(recordNum).putInt(rl).position(0);
writer.shpChannel.write(headerTransfer);
headerTransfer.putInt(0, writer.offset).position(0);
writer.offset += rl + 4;
writer.shxChannel.write(headerTransfer);
// reset to mark and limit at end of record, then write
int oldLimit = buffer.limit();
buffer.position(mark).limit(mark + len);
writer.shpChannel.write(buffer);
buffer.limit(oldLimit);
record.end = this.toFileOffset(buffer.position());
record.number++;
return len;
}
/**
* Fetch the next record information.
*
* @param offset
* @throws IOException
* @return The record instance associated with this reader.
*/
public Geometry geomAt(int offset) throws IOException {
// need to update position
buffer.position(offset);
// record header
buffer.skip(8);
// shape record is all little endian
buffer.order(ByteOrder.LITTLE_ENDIAN);
// read the type, handlers don't need it
ShapeType recordType = ShapeType.forID(buffer.getInt());
// this usually happens if the handler logic is bunk,
// but bad files could exist as well...
if (recordType != ShapeType.NULL && recordType != fileShapeType) {
throw new IllegalStateException(
"ShapeType changed illegally from " + fileShapeType + " to " + recordType);
}
return handler.read(buffer, recordType);
}
/**
* Fetch the next record information.
*
* @throws IOException
* @return The record instance associated with this reader.
*/
public Record nextRecord() throws IOException {
// need to update position
buffer.position(getNextOffset());
if (currentShape != UNKNOWN) currentShape++;
// record header is big endian
buffer.order(ByteOrder.BIG_ENDIAN);
// read shape record header
int recordNumber = buffer.getInt();
// silly ESRI say contentLength is in 2-byte words
// and ByteByffer uses bytes.
// track the record location
int recordLength = buffer.getInt() * 2;
if (!buffer.isReadOnly() && !useMemoryMappedBuffer) {
// capacity is less than required for the record
// copy the old into the newly allocated
if (buffer.capacity() < recordLength + 8) {
this.currentOffset += buffer.position();
ByteBuffer old = buffer;
// ensure enough capacity for one more record header
buffer = ensureCapacity(buffer, recordLength + 8, useMemoryMappedBuffer);
buffer.put(old);
NIOUtilities.clean(old, useMemoryMappedBuffer);
fill(buffer, channel);
buffer.position(0);
} else
// remaining is less than record length
// compact the remaining data and read again,
// allowing enough room for one more record header
if (buffer.remaining() < recordLength + 8) {
this.currentOffset += buffer.position();
buffer.compact();
fill(buffer, channel);
buffer.position(0);
}
}
// shape record is all little endian
buffer.order(ByteOrder.LITTLE_ENDIAN);
// read the type, handlers don't need it
ShapeType recordType = ShapeType.forID(buffer.getInt());
// this usually happens if the handler logic is bunk,
// but bad files could exist as well...
if (recordType != ShapeType.NULL && recordType != fileShapeType) {
throw new IllegalStateException(
"ShapeType changed illegally from " + fileShapeType + " to " + recordType);
}
// peek at bounds, then reset for handler
// many handler's may ignore bounds reading, but we don't want to
// second guess them...
buffer.mark();
if (recordType.isMultiPoint()) {
record.minX = buffer.getDouble();
record.minY = buffer.getDouble();
record.maxX = buffer.getDouble();
record.maxY = buffer.getDouble();
} else if (recordType != ShapeType.NULL) {
record.minX = record.maxX = buffer.getDouble();
record.minY = record.maxY = buffer.getDouble();
}
buffer.reset();
record.offset = record.end;
// update all the record info.
record.length = recordLength;
record.type = recordType;
record.number = recordNumber;
// remember, we read one int already...
record.end = this.toFileOffset(buffer.position()) + recordLength - 4;
// mark this position for the reader
record.start = buffer.position();
// clear any cached shape
record.shape = null;
return record;
}
