iitb.con.ds
Class InstanceTable

java.lang.Object
  iitb.con.ds.InstanceTable

All Implemented Interfaces:

ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

public class InstanceTable
extends java.lang.Object
implements ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

InstanceTable holds the InstanceMetaItem as value objects. The super key is the type id and the sub key is the instance id.

Instances are managed in the concept-net as a set of three files:
ntab file - holds the information about the instance-meta information as InstanceItem
net file - holds the instances
nfsl file - free blocks list in the .net file

The instances are added/updated/removed to the action buffer list and it is committed to the respective file on calling commit() method.

See Also:

InstanceMetaItem, Instance

Constructor Summary

InstanceTable(java.lang.String dirName, java.lang.String mode)
Constructs the InstanceTable.

Method Summary

void	close() Close the file associate with the table
void	commit() Commits the instances to the respective file. Commit operation is performed based on the object and action state that present in the ActionBufferList.
InstanceMetaItem	get(java.lang.Integer instanceId) Returns the InstanceMetaItem for the given instance id
java.util.Map<java.lang.Integer,InstanceMetaItem>	get(java.lang.Short typeId) Returns the hash map with key-value pair as InstanceId , InstanceMetaItem for the given type id
InstanceMetaItem	get(java.lang.Short typeId, java.lang.Integer instanceId) Returns the InstanceMetaItem for the given type id and instance id
java.util.List<InstanceMetaItem>	getAllItems() Returns all the InstanceMetaItems from the table
java.lang.Object	getObject(java.lang.Object o) Returns the InstanceMetaItems for the given type id
void	put(InstanceMetaItem item) Puts the InstanceMetaItem into the instance table
void	put(java.lang.Short typeId, InstanceMetaItem item) Puts the InstanceMetaItem into the instance table with key as type id
void	put(java.lang.Short typeId, java.lang.Integer instanceId, InstanceMetaItem item) Puts the InstanceMetaItem into the instance table with keys as type id and instance id
boolean	remove(InstanceMetaItem item) Removes the instance from the instance table with the given InstanceMetaItem handle
boolean	remove(java.lang.Integer instanceId) Removes the instance from the instance table with instance id as key
boolean	remove(java.lang.Short typeId, java.lang.Integer instanceId) Removes the instance from the instance table with type id and instance id as keys
void	setItem(java.lang.Short typeId, java.lang.Integer instanceId, InstanceMetaItem item) Sets the InstanceMetaItem with keys as type id and instance id
int	size() Returns the size of the table i.e.

Methods inherited from class java.lang.Object

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

Constructor Detail

InstanceTable

public InstanceTable(java.lang.String dirName,
                     java.lang.String mode)
              throws java.io.FileNotFoundException,
                     java.io.IOException

Constructs the InstanceTable.

Parameters:

dirName - directory name of the concept-net

mode - opening mode (r, rw)

Throws:

java.io.FileNotFoundException - if file not found

java.io.IOException - if file operation fails

Method Detail

close

public void close()
           throws java.io.IOException

Close the file associate with the table

Specified by:

close in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Throws:

java.io.IOException - if file operations fail

commit

public void commit()
            throws java.io.IOException

Commits the instances to the respective file.
Commit operation is performed based on the object and action state that present in the ActionBufferList.

Specified by:

commit in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Throws:

java.io.IOException - if file operation fails

get

public InstanceMetaItem get(java.lang.Integer instanceId)

Returns the InstanceMetaItem for the given instance id

Specified by:

get in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Parameters:

instanceId - Instance id

Returns:

InstanceMetaItem

See Also:

Instance

get

public java.util.Map<java.lang.Integer,InstanceMetaItem> get(java.lang.Short typeId)

Returns the hash map with key-value pair as InstanceId , InstanceMetaItem for the given type id

Specified by:

get in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Parameters:

typeId - Type id

Returns:

hash map with key-value pair as InstanceId , InstanceMetaItem

get

public InstanceMetaItem get(java.lang.Short typeId,
                            java.lang.Integer instanceId)

Returns the InstanceMetaItem for the given type id and instance id

Specified by:

get in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Parameters:

typeId - Type id

instanceId - Instance id

Returns:

InstanceMetaItem

See Also:

Type, Instance

getAllItems

public java.util.List<InstanceMetaItem> getAllItems()

Returns all the InstanceMetaItems from the table

Specified by:

getAllItems in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Returns:

InstanceMetaItems as List

See Also:

InstanceMetaItem

getObject

public java.lang.Object getObject(java.lang.Object o)

Returns the InstanceMetaItems for the given type id

Specified by:

getObject in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Parameters:

o - Type id - Short type

Returns:

InstanceMetaItems as Map with instance id as key and InstanceMetaItem as value

put

public void put(InstanceMetaItem item)

Puts the InstanceMetaItem into the instance table

Specified by:

put in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Parameters:

item - InstanceMetaItem

See Also:

InstanceMetaItem

put

public void put(java.lang.Short typeId,
                InstanceMetaItem item)

Puts the InstanceMetaItem into the instance table with key as type id

Specified by:

put in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Parameters:

typeId - Type id

item - InstanceMetaItem

See Also:

Type, InstanceMetaItem

put

public void put(java.lang.Short typeId,
                java.lang.Integer instanceId,
                InstanceMetaItem item)

Puts the InstanceMetaItem into the instance table with keys as type id and instance id

Specified by:

put in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Parameters:

typeId - Type id

instanceId - Instance id

item - InstanceMetaItem

See Also:

Type, Instance, InstanceMetaItem

remove

public boolean remove(InstanceMetaItem item)

Removes the instance from the instance table with the given InstanceMetaItem handle

Parameters:

item - InstanceMetaItem

Returns:

true on success

See Also:

InstanceMetaItem

remove

public boolean remove(java.lang.Integer instanceId)

Removes the instance from the instance table with instance id as key

Specified by:

remove in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Parameters:

instanceId - Instance id

Returns:

true on success

remove

public boolean remove(java.lang.Short typeId,
                      java.lang.Integer instanceId)

Removes the instance from the instance table with type id and instance id as keys

Specified by:

remove in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Parameters:

typeId - Type id

instanceId - Instance id

Returns:

true on success

setItem

public void setItem(java.lang.Short typeId,
                    java.lang.Integer instanceId,
                    InstanceMetaItem item)

Sets the InstanceMetaItem with keys as type id and instance id

Parameters:

typeId - Type id

instanceId - Instance id

item - InstanceMetaItem

See Also:

Type, Instance, InstanceMetaItem

size

public int size()

Returns the size of the table i.e. the no. of instance meta items

Specified by:

size in interface ItemTable<java.lang.Short,java.lang.Integer,InstanceMetaItem>

Returns:

table size