/**
* Reads and parses the contents of a shapefile record from a specified buffer. The buffer's
* current position must be the start of the record and will be the start of the next record when
* the constructor returns.
*
* @param shapefile the containing {@link Shapefile}.
* @param buffer the shapefile record {@link java.nio.ByteBuffer} to read from.
*/
protected void readFromBuffer(Shapefile shapefile, ByteBuffer buffer) {
// Read record number and record length - big endian.
buffer.order(ByteOrder.BIG_ENDIAN);
this.recordNumber = buffer.getInt();
this.contentLengthInBytes = buffer.getInt() * 2;
// Read shape type - little endian
buffer.order(ByteOrder.LITTLE_ENDIAN);
int type = buffer.getInt();
String shapeType = shapefile.getShapeType(type);
this.validateShapeType(shapefile, shapeType);
this.shapeType = shapeType;
this.shapeFile = shapefile;
this.doReadFromBuffer(shapefile, buffer);
}
/**
* Constructs a record instance from the given {@link java.nio.ByteBuffer}. The buffer's current
* position must be the start of the record, and will be the start of the next record when the
* constructor returns.
*
* @param shapeFile the parent {@link Shapefile}.
* @param buffer the shapefile record {@link java.nio.ByteBuffer} to read from.
* @throws IllegalArgumentException if any argument is null or otherwise invalid.
* @throws gov.nasa.worldwind.exception.WWRuntimeException if the record's shape type does not
* match that of the shapefile.
*/
public ShapefileRecord(Shapefile shapeFile, ByteBuffer buffer) {
if (shapeFile == null) {
String message = Logging.getMessage("nullValue.ShapefileIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (buffer == null) {
String message = Logging.getMessage("nullValue.BufferIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
// Save the buffer's current position.
int pos = buffer.position();
try {
this.readFromBuffer(shapeFile, buffer);
} finally {
// Move to the end of the record.
buffer.position(pos + this.contentLengthInBytes + RECORD_HEADER_LENGTH);
}
}