/**
* Verifies that the record's shape type matches the expected one, typically that of the
* shapefile. All non-null records in a Shapefile must be of the same type. Throws an exception if
* the types do not match and the shape type is not <code>{@link Shapefile#SHAPE_NULL}</code>.
* Records of type <code>SHAPE_NULL</code> are always valid, and may appear in any Shapefile.
*
* <p>For details, see the ESRI Shapefile specification at <a
* href="http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf"/>, pages 4 and 5.
*
* @param shapefile the shapefile.
* @param shapeType the record's shape type.
* @throws WWRuntimeException if the shape types do not match.
* @throws IllegalArgumentException if the specified shape type is null.
*/
protected void validateShapeType(Shapefile shapefile, String shapeType) {
if (shapeType == null) {
String message = Logging.getMessage("nullValue.ShapeType");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (!shapeType.equals(shapefile.getShapeType()) && !shapeType.equals(Shapefile.SHAPE_NULL)) {
String message = Logging.getMessage("SHP.UnsupportedShapeType", shapeType);
Logging.logger().severe(message);
throw new WWRuntimeException(message);
}
}
/**
* 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);
}
/**
* Indicates whether the record is a shape type containing Z values.
*
* @return true if the record is a type containing Z values.
*/
protected boolean isZType() {
return Shapefile.isZType(this.getShapeType());
}
