org.gvsig.dwg.lib.readers

Class DwgFileV15Reader

java.lang.Object

org.gvsig.dwg.lib.readers.DwgFileV15Reader

All Implemented Interfaces:

IDwgFileReader

public class DwgFileV15Reader
extends java.lang.Object
implements IDwgFileReader

The DwgFileV15Reader reads the DWG version 15 format

Field Summary

Fields

Modifier and Type	Field and Description
protected java.nio.ByteBuffer	bb
protected DwgFile	dwgFile

Constructor Summary

Constructors

Constructor and Description
DwgFileV15Reader()

Method Summary

Modifier and Type	Method and Description
protected void	checkSuperentities()
DwgObject	getDwgObjectByIndex(int index) Return a dwg object from its index in the dwg file
void	read(DwgFile dwgFile, java.nio.ByteBuffer bb) Reads the DWG version 15 format
protected void	readDwgClasses()
protected void	readDwgClasses2()
protected DwgObject	readDwgObject(int offset, int index) Reads a dwg drawing entity (dwg object) given its offset in the file
protected void	readDwgObjectOffsets() OpenDWG spec says: This section -object map- is a table which gives the location of each object in the DWG file.
protected void	readDwgObjects() Reads all the object referenced in the object map section of the DWG file (using their object file obsets)
protected void	readDwgSectionOffsets() It read the SECTIONS from the header of the DWG file
protected void	readHeaders()
int	readObjectHeader(int[] data, int offset, DwgObject dwgObject) Reads the header of an object in a DWG file Version 15
int	readObjectTailer(int[] data, int offset, DwgObject dwgObject) Reads the tail of an object in a DWG file Version 15
protected void	readSpecificObject(DwgObject obj, int[] data, int bitPos)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

dwgFile

protected DwgFile dwgFile

bb

protected java.nio.ByteBuffer bb

Constructor Detail

DwgFileV15Reader

public DwgFileV15Reader()

Method Detail

read

public void read(DwgFile dwgFile,
                 java.nio.ByteBuffer bb)
          throws java.io.IOException

Reads the DWG version 15 format

Specified by:

read in interface IDwgFileReader

Parameters:

dwgFile - Represents the DWG file that we want to read

bb - Memory mapped byte buffer of the whole DWG file

Throws:

java.io.IOException - When DWG file path is wrong

checkSuperentities

protected void checkSuperentities()

readDwgSectionOffsets

protected void readDwgSectionOffsets()

It read the SECTIONS from the header of the DWG file

readDwgObjectOffsets

protected void readDwgObjectOffsets()
                             throws java.lang.Exception

OpenDWG spec says: This section -object map- is a table which gives the location of each object in the DWG file. This table is broken into sections. It is basically a list of handle/file loc pairs. It could be readed with this pseudocode: Set lastHandle to all 0 and last loc to 0L. Repeat until section size == 2 section size = read short (in bigendian order) Repeat until out of data for this section offset of this handle form last handle as modular char offset of location in file from last location as modular char End repeat End repeat

Throws:

java.lang.Exception

readDwgClasses

protected void readDwgClasses()
                       throws java.lang.Exception

Throws:

java.lang.Exception

readDwgClasses2

protected void readDwgClasses2()
                        throws java.lang.Exception

Throws:

java.lang.Exception

readDwgObjects

protected void readDwgObjects()

Reads all the object referenced in the object map section of the DWG file (using their object file obsets)

readObjectHeader

public int readObjectHeader(int[] data,
                            int offset,
                            DwgObject dwgObject)

Reads the header of an object in a DWG file Version 15

Specified by:

readObjectHeader in interface IDwgFileReader

Parameters:

data - Array of unsigned bytes obtained from the DWG binary file

offset - The current bit offset where the value begins

Returns:

int New offset

readObjectTailer

public int readObjectTailer(int[] data,
                            int offset,
                            DwgObject dwgObject)
                     throws java.lang.RuntimeException,
                            CorruptedDwgEntityException

Reads the tail of an object in a DWG file Version 15

Specified by:

readObjectTailer in interface IDwgFileReader

Parameters:

data - Array of bytes obtained from the DWG binary file

offset - Offset for this array of bytes

Returns:

int New offset

Throws:

CorruptedDwgEntityException

java.lang.RuntimeException

getDwgObjectByIndex

public DwgObject getDwgObjectByIndex(int index)

Return a dwg object from its index in the dwg file

Parameters:

index - of the requested dwg object in the dwg file

readDwgObject

protected DwgObject readDwgObject(int offset,
                                  int index)

Reads a dwg drawing entity (dwg object) given its offset in the file

readSpecificObject

protected void readSpecificObject(DwgObject obj,
                                  int[] data,
                                  int bitPos)
                           throws java.lang.RuntimeException,
                                  CorruptedDwgEntityException

Throws:

java.lang.RuntimeException

CorruptedDwgEntityException

readHeaders

protected void readHeaders()