org.gvsig.dwg.lib

Class DwgUtil

java.lang.Object

org.gvsig.dwg.lib.DwgUtil

public final class DwgUtil
extends Object

The DwgUtil class contains the essential set of functions for reading bitstreams in DWG files

Constructor Summary

Constructors

Constructor and Description
DwgUtil()

Method Summary

Modifier and Type	Method and Description
static int[]	bytesToMachineBytes(byte[] data) Convert bytes to machine value bytes
static ArrayList	getBitDouble(int[] data, int offset) Read a double value from a group of unsigned bytes
static ArrayList	getBitLong(int[] data, int offset) Read a long value from a group of unsigned bytes
static Object	getBits(int[] data, int count, int offset) Returns a set of bits from a group of unsigned bytes
static ArrayList	getBitShort(int[] data, int offset) Read a short value from a group of unsigned bytes
static ArrayList	getCmColor(int[] intData, int offset, String version) Read a CmColor from a group of unsigned bytes
static ArrayList	getDefaultDouble(int[] data, int offset, double defVal) Read a double value from a group of unsigned bytes and a default double
static ArrayList	getHandle(int[] data, int offset) Read a int value (the handle of a DWG object) from a group of unsigned bytes
static ArrayList	getModularChar(int[] data, int offset) Read a char value from a group of unsigned bytes
static int	getModularShort(ByteBuffer bb) Read a int value (the size of a modular short) from a ByteBuffer
static ArrayList	getRawChar(int[] data, int offset) Read a char value from a group of unsigned bytes
static ArrayList	getRawDouble(int[] data, int offset) Read a double value from a group of unsigned bytes
static ArrayList	getRawLong(int[] data, int offset) Read a long value from a group of unsigned bytes
static ArrayList	getRawShort(int[] data, int offset) Read a short value from a group of unsigned bytes
static ArrayList	getTextString(int[] data, int offset) Read a String from a group of unsigned bytes
static int	handleBinToHandleInt(ArrayList layerHandle) Obtain the int value of a handle given in binary format
static int	handleToInt(List fromGetHandle) It receives the list procedent from getHandle method, and return the handle as int
static ArrayList	readExtendedData(int[] data, int offset) Read the extended data for a DWG object Don't use in this version.
static ArrayList	testBit(int[] data, int offset) Test a bit obtained from a set of unsigned bytes
static int[]	toIntArray(byte[] bytes)

Methods inherited from class java.lang.Object

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

Constructor Detail

DwgUtil

public DwgUtil()

Method Detail

readExtendedData

public static ArrayList readExtendedData(int[] data,
                                         int offset)
                                  throws RuntimeException

Read the extended data for a DWG object Don't use in this version. Serious bugs detected

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the extended data of a DWG object

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getDefaultDouble

public static ArrayList getDefaultDouble(int[] data,
                                         int offset,
                                         double defVal)
                                  throws RuntimeException

Read a double value from a group of unsigned bytes and a default double

Parameters:

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

offset - The current bit offset where the value begins

defVal - Default double value

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the double value

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getBitDouble

public static ArrayList getBitDouble(int[] data,
                                     int offset)
                              throws RuntimeException

Read a double value from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the double value

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getRawDouble

public static ArrayList getRawDouble(int[] data,
                                     int offset)
                              throws RuntimeException

Read a double value from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the double value

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getBitShort

public static ArrayList getBitShort(int[] data,
                                    int offset)
                             throws RuntimeException

Read a short value from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the short value

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getRawShort

public static ArrayList getRawShort(int[] data,
                                    int offset)
                             throws RuntimeException

Read a short value from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the short value

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getBitLong

public static ArrayList getBitLong(int[] data,
                                   int offset)
                            throws RuntimeException

Read a long value from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the long value

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getRawLong

public static ArrayList getRawLong(int[] data,
                                   int offset)
                            throws RuntimeException

Read a long value from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the long value

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

RuntimeException

getRawChar

public static ArrayList getRawChar(int[] data,
                                   int offset)
                            throws RuntimeException

Read a char value from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the char value

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getModularChar

public static ArrayList getModularChar(int[] data,
                                       int offset)
                                throws RuntimeException

Read a char value from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the char value

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getTextString

public static ArrayList getTextString(int[] data,
                                      int offset)
                               throws RuntimeException

Read a String from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the String

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getCmColor

public static ArrayList getCmColor(int[] intData,
                                   int offset,
                                   String version)
                            throws RuntimeException

Read a CmColor from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the int value (handle of a DWG object)

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getHandle

public static ArrayList getHandle(int[] data,
                                  int offset)
                           throws RuntimeException

Read a int value (the handle of a DWG object) from a group of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is the int value (handle of a DWG object)

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

getModularShort

public static int getModularShort(ByteBuffer bb)

Read a int value (the size of a modular short) from a ByteBuffer

Parameters:

bb - Data given as a ByteBuffer

Returns:

int Size of the modular short

getBits

public static Object getBits(int[] data,
                             int count,
                             int offset)
                      throws RuntimeException

Returns a set of bits from a group of unsigned bytes

Parameters:

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

count - Bit counter

offset - The current bit offset where the value begins

Returns:

This method returns an array of bytes or an int value

Throws:

RuntimeException - If an unexpected bit value is found in the DWG file. Occurs when we are looking for LwPolylines.

testBit

public static ArrayList testBit(int[] data,
                                int offset)

Test a bit obtained from a set of unsigned bytes

Parameters:

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

offset - The current bit offset where the value begins

Returns:

ArrayList This ArrayList has two parts. First is an int value that represents the new offset, and second is a bit flag

bytesToMachineBytes

public static int[] bytesToMachineBytes(byte[] data)

Convert bytes to machine value bytes

Parameters:

data - Input of array of bytes

Returns:

int[] Output of array of machine bytes

handleToInt

public static int handleToInt(List fromGetHandle)

It receives the list procedent from getHandle method, and return the handle as int

handleBinToHandleInt

public static int handleBinToHandleInt(ArrayList layerHandle)

Obtain the int value of a handle given in binary format

Parameters:

layerHandle - Handle in binary format

Returns:

int Int value of the handle

toIntArray

public static int[] toIntArray(byte[] bytes)