uk.ac.starlink.util.gui
Class StoreConfiguration

java.lang.Object
  extended by javax.swing.table.AbstractTableModel
      extended by uk.ac.starlink.util.gui.StoreConfiguration
All Implemented Interfaces:
Serializable, TableModel

public class StoreConfiguration
extends AbstractTableModel

This class interacts with a permanent set of configuration states stored in an XML-format disk file. Each state is identified by a description and date stamp, which are added when a state is stored. The content of the state isn't actually understood at this level that is left to more specific classes.

An instance of this class presents itself as two services. One is as a JTable model, this provides a model of two columns, the first being the state description the second the date stamp. The second set of services are provided to get at states and to store new ones. These latter options are provided by passing back references to suitable Elements of a Document, which then act as roots for the state.

The format of the XML file is just determined by the practices adopted in this file and by the StoreSource implementation, rather than by a DTD or Schema. The root element is each child of this element is called whatever StoreSource.getTagName() returns, with the attributes "description" and "date-stamp", what goes after this is determined by the writer of the configurations, but the general idea is for each object in the configuration to write its state to a new Element.

Author:
Peter W. Draper
See Also:
Element, StoreControlFrame, StoreSource, Serialized Form

Field Summary
protected  String applicationName
          Name of the application (used for name of config directory).
protected  Document document
          The Document.
protected  Element rootElement
          Document root Element.
protected  String storeName
          Name of the file used for storage.
 
Fields inherited from class javax.swing.table.AbstractTableModel
listenerList
 
Constructor Summary
StoreConfiguration(InputStream inputStream)
          Create an instance.
StoreConfiguration(String applicationName, String storeName)
          Create an instance.
 
Method Summary
protected  void createEmptyDoc()
          Create an empty document
static List getChildElements(Element element)
          Return all the Elements that are children of another Element.
 int getColumnCount()
          Get the number of columns.
 String getColumnName(int column)
          Get the name of a column.
 int getCount()
          Get the number of states that are stored.
 String getDateStamp(int index)
          Get the date stamp of a state by index.
 String getDescription(int index)
          Get the description of a state by index.
 int getRowCount()
          Return the numbers of states that we're currently storing.
 Element getState(int index)
          Get a state from the store.
 Object getValueAt(int row, int column)
          Return either the description or date stamp of a state.
 void initFromBackingStore()
          Initialise the local DOM from the backing store file.
 void initFromBackingStore(InputStream inputStream)
          Initialise the local DOM from an InputStream.
 boolean isCellEditable(int row, int column)
          Let the JTable know that the descriptions are edittable.
 Element newState(String elementName, String description)
          Create a new Element ready for attaching a configuration state to (i.e.
 Element reGetState(int index)
          Re-get a state from the store.
 void removeState(int index)
          Permanently remove a state from store.
 void setDateStamp(int index)
          Set the date stamp of a state by index.
 void setDescription(int index, String value)
          Set the description of a state by index.
 void setValueAt(Object value, int row, int column)
          Change a description in response to a user edit.
 void stateCompleted(Element newState)
          Add a new state root in a given Element.
 void writeToBackingStore()
          Save the Document to backing store.
 
Methods inherited from class javax.swing.table.AbstractTableModel
addTableModelListener, findColumn, fireTableCellUpdated, fireTableChanged, fireTableDataChanged, fireTableRowsDeleted, fireTableRowsInserted, fireTableRowsUpdated, fireTableStructureChanged, getColumnClass, getListeners, getTableModelListeners, removeTableModelListener
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

document

protected Document document
The Document.


rootElement

protected Element rootElement
Document root Element.


applicationName

protected String applicationName
Name of the application (used for name of config directory).


storeName

protected String storeName
Name of the file used for storage.

Constructor Detail

StoreConfiguration

public StoreConfiguration(String applicationName,
                          String storeName)
Create an instance. This synchronises the current total state with that of the backing store.

Parameters:
applicationName - name of the application controlling this store. Used to create a top-element, also defines the configuration directory. XXX use Properties for this?
storeName - name of the file that contains the configuration

StoreConfiguration

public StoreConfiguration(InputStream inputStream)
Create an instance. This synchronises the current total state with that read from a given InputStream (useful when want to get a default configuration using a getResource()). If you use this method it is not possible to save to backing store.

Parameters:
stream - InputStream that contains an XML description of a series of configurations (i.e. a wrapped backing store file).
Method Detail

initFromBackingStore

public void initFromBackingStore(InputStream inputStream)
Initialise the local DOM from an InputStream.


initFromBackingStore

public void initFromBackingStore()
Initialise the local DOM from the backing store file. If this doesn't exist then just create an empty Document with a basic root Element.


createEmptyDoc

protected void createEmptyDoc()
Create an empty document


getChildElements

public static List getChildElements(Element element)
Return all the Elements that are children of another Element.


getCount

public int getCount()
Get the number of states that are stored.


getState

public Element getState(int index)
Get a state from the store. These are indexed simply by the order in the current document.


reGetState

public Element reGetState(int index)
Re-get a state from the store. Re-getting implies that this will be overwritten so all children are removed.


getDescription

public String getDescription(int index)
Get the description of a state by index.


setDescription

public void setDescription(int index,
                           String value)
Set the description of a state by index.


getDateStamp

public String getDateStamp(int index)
Get the date stamp of a state by index.


setDateStamp

public void setDateStamp(int index)
Set the date stamp of a state by index. Updates to representation of the current time.


stateCompleted

public void stateCompleted(Element newState)
Add a new state root in a given Element. The Element should be created by the newState method.


newState

public Element newState(String elementName,
                        String description)
Create a new Element ready for attaching a configuration state to (i.e. get this Element then write the configuration data attached to it). When the new configuration is completed invoke the stateCompleted method, the configuration will not be part of the structure until then.


removeState

public void removeState(int index)
Permanently remove a state from store.


writeToBackingStore

public void writeToBackingStore()
Save the Document to backing store.


getRowCount

public int getRowCount()
Return the numbers of states that we're currently storing.


getColumnCount

public int getColumnCount()
Get the number of columns. Always 2.


getValueAt

public Object getValueAt(int row,
                         int column)
Return either the description or date stamp of a state.


getColumnName

public String getColumnName(int column)
Get the name of a column.

Specified by:
getColumnName in interface TableModel
Overrides:
getColumnName in class AbstractTableModel

setValueAt

public void setValueAt(Object value,
                       int row,
                       int column)
Change a description in response to a user edit.

Specified by:
setValueAt in interface TableModel
Overrides:
setValueAt in class AbstractTableModel

isCellEditable

public boolean isCellEditable(int row,
                              int column)
Let the JTable know that the descriptions are edittable.

Specified by:
isCellEditable in interface TableModel
Overrides:
isCellEditable in class AbstractTableModel


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