AbstractRecentItemsHandler (meka 1.9.1 API)

java.lang.Object
- meka.gui.core.AbstractRecentItemsHandler<M,T>

Type Parameters:

M - the type of menu to use

T - the type of item to use

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

RecentFilesHandler, RecentFilesHandlerWithCommandline
```
public abstract class AbstractRecentItemsHandler<M,T>
extends Object
implements Serializable
```
Ancestor for classes that handle a list of recent items. Reads/writes them from/to a props file in the application's home directory.

Version:

$Revision$

Author:

fracpete (fracpete at waikato dot ac dot nz)

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`protected boolean`	`m_IgnoreChanges` whether to ignore changes temporarily.
`protected HashSet<RecentItemListener<M,T>>`	`m_Listeners` the event listeners.
`protected int`	`m_MaxCount` the maximum number of items to keep.
`protected M`	`m_Menu` the menu to add the items as sub-items to.
`protected String`	`m_PropertiesFile` the props file to use.
`protected String`	`m_PropertyPrefix` the prefix for the properties.
`protected List<T>`	`m_RecentItems` the items.

Constructor Summary

Constructors
Constructor and Description
`AbstractRecentItemsHandler(String propsFile, int maxCount, M menu)` Initializes the handler.
`AbstractRecentItemsHandler(String propsFile, M menu)` Initializes the handler with a maximum of 5 items.
`AbstractRecentItemsHandler(String propsFile, String propPrefix, int maxCount, M menu)` Initializes the handler.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addRecentItem(T item)` Adds the item to the internal list.
`void`	`addRecentItemListener(RecentItemListener l)` Adds the listener to the internal list.
`protected boolean`	`check(T item)` Checks the item after obtaining from the props file.
`protected abstract String`	`createMenuItemText(int index, T item)` Generates the text for the menuitem.
`protected void`	`doUpdateMenu()` Updates the menu.
`protected String`	`expand(String property)` Adds the prefix to the property name if provided.
`protected abstract T`	`fromString(String s)` Turns the string obtained from the props into an object again.
`protected abstract String`	`getCountKey()` Returns the key to use for the counts in the props file.
`protected abstract String`	`getItemPrefix()` Returns the key prefix to use for the items in the props file.
`int`	`getMaxCount()` Returns the maximum number of items to keep.
`M`	`getMenu()` Returns the menu to add the recent items as subitems to.
`String`	`getPropertiesFile()` Returns the props file used to store the recent items in.
`String`	`getPropertyPrefix()` Returns the prefix for the property names.
`List<T>`	`getRecentItems()` Returns the currently stored recent items.
`protected Properties`	`loadProps()` Loads the properties file from disk, if possible.
`protected void`	`notifyRecentItemListenersOfAdd(T item)` Notifies the listeners of a item that got added.
`protected void`	`notifyRecentItemListenersOfSelect(T item)` Notifies the listeners of a item that got selected.
`protected void`	`postUpdateMenu()` Hook method which gets executed just after the menu was updated.
`protected void`	`preUpdateMenu()` Hook method which gets executed just before the menu gets updated.
`protected void`	`readProps()` Reads the recent items from the props file.
`void`	`removeAll()` Removes all items from the internal list.
`void`	`removeRecentItem(T item)` Removes the item from the internal list, e.g., if it no longer exists on disk.
`void`	`removeRecentItemListener(RecentItemListener l)` Removes the listener from the internal list.
`int`	`size()` Returns the number of recent items currently stored.
`protected abstract String`	`toString(T obj)` Turns an object into a string for storing in the props.
`protected void`	`updateMenu()` Updates the menu with the currently stored recent files.
`protected void`	`writeProps()` Writes the current recent items back to the props file.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - m_PropertiesFile
```
protected String m_PropertiesFile
```
    the props file to use.
  - m_PropertyPrefix
```
protected String m_PropertyPrefix
```
    the prefix for the properties.
  - m_MaxCount
```
protected int m_MaxCount
```
    the maximum number of items to keep.
  - m_Menu
```
protected M m_Menu
```
    the menu to add the items as sub-items to.
  - m_RecentItems
```
protected List<T> m_RecentItems
```
    the items.
  - m_IgnoreChanges
```
protected boolean m_IgnoreChanges
```
    whether to ignore changes temporarily.
  - m_Listeners
```
protected HashSet<RecentItemListener<M,T>> m_Listeners
```
    the event listeners.
- Constructor Detail
  - AbstractRecentItemsHandler
```
public AbstractRecentItemsHandler(String propsFile,
                                  M menu)
```
    Initializes the handler with a maximum of 5 items.
    
    Parameters:
    
    propsFile - the props file to store the items in
    
    menu - the menu to add the recent items as subitems to
  - AbstractRecentItemsHandler
```
public AbstractRecentItemsHandler(String propsFile,
                                  int maxCount,
                                  M menu)
```
    Initializes the handler.
    
    Parameters:
    
    propsFile - the props file to store the items in
    
    maxCount - the maximum number of items to keep in menu
    
    menu - the menu to add the recent items as subitems to
  - AbstractRecentItemsHandler
```
public AbstractRecentItemsHandler(String propsFile,
                                  String propPrefix,
                                  int maxCount,
                                  M menu)
```
    Initializes the handler.
    
    Parameters:
    
    propsFile - the props file to store the items in
    
    propPrefix - the properties prefix, use null to ignore
    
    maxCount - the maximum number of items to keep in menu
    
    menu - the menu to add the recent items as subitems to
- Method Detail
  - getPropertiesFile
```
public String getPropertiesFile()
```
    Returns the props file used to store the recent items in.
    
    Returns:
    
    the filename
  - getPropertyPrefix
```
public String getPropertyPrefix()
```
    Returns the prefix for the property names.
    
    Returns:
    
    the prefix
  - getMaxCount
```
public int getMaxCount()
```
    Returns the maximum number of items to keep.
    
    Returns:
    
    the maximum number
  - getMenu
```
public M getMenu()
```
    Returns the menu to add the recent items as subitems to.
    
    Returns:
    
    the menu
  - getCountKey
```
protected abstract String getCountKey()
```
    Returns the key to use for the counts in the props file.
    
    Returns:
    
    the key
  - getItemPrefix
```
protected abstract String getItemPrefix()
```
    Returns the key prefix to use for the items in the props file.
    
    Returns:
    
    the prefix
  - toString
```
protected abstract String toString(T obj)
```
    Turns an object into a string for storing in the props.
    
    Parameters:
    
    obj - the object to convert
    
    Returns:
    
    the string representation
  - fromString
```
protected abstract T fromString(String s)
```
    Turns the string obtained from the props into an object again.
    
    Parameters:
    
    s - the string representation
    
    Returns:
    
    the parsed object
  - expand
```
protected String expand(String property)
```
    Adds the prefix to the property name if provided.
    
    Parameters:
    
    property - the property to expand
    
    Returns:
    
    the expanded property name
  - loadProps
```
protected Properties loadProps()
```
    Loads the properties file from disk, if possible.
    
    Returns:
    
    the properties file
  - check
```
protected boolean check(T item)
```
    Checks the item after obtaining from the props file.
    
    Default implementation performs no checks and always returns true.
    
    Parameters:
    
    item - the item to check
    
    Returns:
    
    true if checks passed
  - readProps
```
protected void readProps()
```
    Reads the recent items from the props file.
  - writeProps
```
protected void writeProps()
```
    Writes the current recent items back to the props file.
  - preUpdateMenu
```
protected void preUpdateMenu()
```
    Hook method which gets executed just before the menu gets updated.
    
    Default implementation does nothing.
  - createMenuItemText
```
protected abstract String createMenuItemText(int index,
                                             T item)
```
    Generates the text for the menuitem.
    
    Parameters:
    
    index - the index of the item
    
    item - the item itself
    
    Returns:
    
    the generated text
  - doUpdateMenu
```
protected void doUpdateMenu()
```
    Updates the menu.
  - postUpdateMenu
```
protected void postUpdateMenu()
```
    Hook method which gets executed just after the menu was updated.
    
    Default implementation does nothing.
  - updateMenu
```
protected void updateMenu()
```
    Updates the menu with the currently stored recent files.
  - addRecentItem
```
public void addRecentItem(T item)
```
    Adds the item to the internal list.
    
    Parameters:
    
    item - the item to add to the list
  - removeRecentItem
```
public void removeRecentItem(T item)
```
    Removes the item from the internal list, e.g., if it no longer exists on disk.
    
    Parameters:
    
    item - the item to remove from the list
  - removeAll
```
public void removeAll()
```
    Removes all items from the internal list.
  - getRecentItems
```
public List<T> getRecentItems()
```
    Returns the currently stored recent items.
    
    Returns:
    
    the items
  - size
```
public int size()
```
    Returns the number of recent items currently stored.
    
    Returns:
    
    the number of items
  - addRecentItemListener
```
public void addRecentItemListener(RecentItemListener l)
```
    Adds the listener to the internal list.
    
    Parameters:
    
    l - the listener to add
  - removeRecentItemListener
```
public void removeRecentItemListener(RecentItemListener l)
```
    Removes the listener from the internal list.
    
    Parameters:
    
    l - the listener to remove
  - notifyRecentItemListenersOfAdd
```
protected void notifyRecentItemListenersOfAdd(T item)
```
    Notifies the listeners of a item that got added.
    
    Parameters:
    
    item - the affected item
  - notifyRecentItemListenersOfSelect
```
protected void notifyRecentItemListenersOfSelect(T item)
```
    Notifies the listeners of a item that got selected.
    
    Parameters:
    
    item - the affected item

Class AbstractRecentItemsHandler<M,T>

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

m_PropertiesFile

m_PropertyPrefix

m_MaxCount

m_Menu

m_RecentItems

m_IgnoreChanges

m_Listeners

Constructor Detail

AbstractRecentItemsHandler

AbstractRecentItemsHandler

AbstractRecentItemsHandler

Method Detail

getPropertiesFile

getPropertyPrefix

getMaxCount

getMenu

getCountKey

getItemPrefix

toString

fromString

expand

loadProps

check

readProps

writeProps

preUpdateMenu

createMenuItemText

doUpdateMenu

postUpdateMenu

updateMenu

addRecentItem

removeRecentItem

removeAll

getRecentItems

size

addRecentItemListener

removeRecentItemListener

notifyRecentItemListenersOfAdd

notifyRecentItemListenersOfSelect