Class IndexNode 

java.lang.Object
   |
   +----IndexNode
public class IndexNode
extends Object
An index node for a simulated file system.

Author:
Ray Ontko

Variable Index

o INDEX_NODE_SIZE
Size of each index node in bytes.
o MAX_DIRECT_BLOCKS
Maximum number of direct blocks in an index node.
o MAX_FILE_BLOCKS
Maximum number of blocks in a file.

Constructor Index

o IndexNode()
Creates an index node.

Method Index

o copy(IndexNode)
o getAtime()
o getBlockAddress(int)
Gets the address corresponding to the specified sequential block of the file.
o getCtime()
o getGid()
o getMode()
Gets the mode for this IndexNode.
o getMtime()
o getNlink()
Get the number of links for this IndexNode.
o getSize()
Gets the size for this IndexNode.
o getUid()
o main(String[])
A test driver for IndexNode.
o read(byte[], int)
Reads the contents of an index node from a byte array.
o setAtime(int)
o setBlockAddress(int, int)
Sets the address corresponding to the specified sequential block of the file.
o setCtime(int)
o setGid(short)
o setMode(short)
Sets the mode for this IndexNode.
o setMtime(int)
o setNlink(short)
Set the number of links for this IndedNode.
o setSize(int)
Sets the size for this IndexNode.
o setUid(short)
o toString()
Converts an index node into a printable string.
o write(byte[], int)
Writes the contents of an index node to a byte array.

Variables

o INDEX_NODE_SIZE 
 public static final int INDEX_NODE_SIZE
Size of each index node in bytes.

o MAX_DIRECT_BLOCKS 
 public static final int MAX_DIRECT_BLOCKS
Maximum number of direct blocks in an index node.

o MAX_FILE_BLOCKS 
 public static final int MAX_FILE_BLOCKS
Maximum number of blocks in a file. If indirect, doubleIndirect, or tripleIndirect blocks are implemented, this number will need to be increased.

Constructors

o IndexNode 
 public IndexNode()
Creates an index node.

Methods

o setMode 
 public void setMode(short newMode)
Sets the mode for this IndexNode. This is the file type and file protection information.

o getMode 
 public short getMode()
Gets the mode for this IndexNode. This is the file type and file protection information.

o setNlink 
 public void setNlink(short newNlink)
Set the number of links for this IndedNode.

Parameters:
newNlink - the number of links
o getNlink 
 public short getNlink()
Get the number of links for this IndexNode.

Returns:
the number of links
o setUid 
 public void setUid(short newUid)
o getUid 
 public short getUid()
o getGid 
 public short getGid()
o setGid 
 public void setGid(short newGid)
o setSize 
 public void setSize(int newSize)
Sets the size for this IndexNode. This is the number of bytes in the file.

o getSize 
 public int getSize()
Gets the size for this IndexNode. This is the number of bytes in the file.

o getBlockAddress 
 public int getBlockAddress(int block) throws Exception
Gets the address corresponding to the specified sequential block of the file.

Parameters:
block - the sequential block number
Returns:
the address of the block, a number between zero and one less than the number of blocks in the file system
Throws: Exception
if the block number is invalid
o setBlockAddress 
 public void setBlockAddress(int block,
                             int address) throws Exception
Sets the address corresponding to the specified sequential block of the file.

Parameters:
block - the sequential block number
address - the address of the block, a number between zero and one less than the number of blocks in the file system
Throws: Exception
if the block number is invalid
o setAtime 
 public void setAtime(int newAtime)
o getAtime 
 public int getAtime()
o setMtime 
 public void setMtime(int newMtime)
o getMtime 
 public int getMtime()
o setCtime 
 public void setCtime(int newCtime)
o getCtime 
 public int getCtime()
o write 
 public void write(byte buffer[],
                   int offset)
Writes the contents of an index node to a byte array. This is used to copy the bytes which correspond to the disk image of the index node onto a block buffer so that they may be written to the file system.

Parameters:
buffer - the buffer to which bytes should be written
offset - the offset from the beginning of the buffer at which bytes should be written
o read 
 public void read(byte buffer[],
                  int offset)
Reads the contents of an index node from a byte array. This is used to copy the bytes which correspond to the disk image of the index node from a block buffer that has been read from the file system.

Parameters:
buffer - the buffer from which bytes should be read
offset - the offset from the beginning of the buffer at which bytes should be read
o toString 
 public String toString()
Converts an index node into a printable string.

Returns:
the printable string
Overrides:
toString in class Object
o copy 
 public void copy(IndexNode indexNode)
o main 
 public static void main(String args[]) throws Exception
A test driver for IndexNode.

Throws: Exception
any exception which may occur