org.apache.batik.dom.svg
Class AbstractSVGList

java.lang.Object
  extended by org.apache.batik.dom.svg.AbstractSVGList
Direct Known Subclasses:
AbstractSVGLengthList, AbstractSVGNumberList, AbstractSVGPathSegList, AbstractSVGPointList, AbstractSVGTransformList

public abstract class AbstractSVGList
extends Object

This class is a base implementation for a live list representation of SVG attributes.

This class provides support for an SVG list representation of an attribute. It implements basic list functionality that is common to all of the SVG*List interfaces.

For a specific attribute, it requires an attribute value, a parser, and a method to create items.

Whenever the attribute changes outside of the control of the list, this list must be invalidated.


Nested Class Summary
protected  class AbstractSVGList.ListBuilder
          A class for receiving notification of parsed list items.
 
Field Summary
protected  List itemList
          The list of items.
protected  boolean valid
          Whether this list is valid.
 
Constructor Summary
AbstractSVGList()
           
 
Method Summary
protected  SVGItem appendItemImpl(Object newItem)
          Inserts a new item at the end of the list.
protected abstract  void checkItemType(Object newItem)
          Asserts that the given object is an appropriate SVG object for this list.
 void clear()
          Removes all items from the list.
protected  void clear(List list)
          Clears the list and sets the parent of the former list items to null.
protected abstract  DOMException createDOMException(short type, String key, Object[] args)
          Create a DOM Exception.
protected abstract  SVGItem createSVGItem(Object newItem)
          Creates an SVGItem object that has the same values as those in the specified SVG object.
protected abstract  void doParse(String value, ListHandler builder)
          Parses the given attribute value and informs the specified ListHandler of the parsed list items.
protected  SVGItem getItemImpl(int index)
          Returns the item from the list at the specified index.
protected abstract  String getItemSeparator()
          Returns the separator string to use when constructing a string representation of the entire list.
 int getNumberOfItems()
          Returns the number of items in the list.
protected abstract  String getValueAsString()
          Returns the value of the DOM attribute containing the list.
protected  SVGItem initializeImpl(Object newItem)
          Removes all items from the list and adds the specified item to the list.
protected  SVGItem insertItemBeforeImpl(Object newItem, int index)
          Inserts a new item into the list at the specified position.
 void invalidate()
          Invalidates this list.
 void itemChanged()
          Method to be called by a member SVGItem object when its value changes.
protected  SVGItem removeIfNeeded(Object newItem)
          Removes the specified object from its parent list if it is an item, or creates a new item if the specified object is not an item.
protected  void removeItem(SVGItem item)
          Removes an item from the list.
protected  SVGItem removeItemImpl(int index)
          Removes an existing item from the list.
protected  SVGItem replaceItemImpl(Object newItem, int index)
          Replaces an existing item in the list with a new item.
protected  void resetAttribute()
          Resets the value of the associated attribute.
protected  void resetAttribute(SVGItem item)
          Appends the string representation of the given SVGItem to the DOM attribute.
protected  void revalidate()
          Initializes the list, if needed.
protected abstract  void setAttributeValue(String value)
          Sets the DOM attribute value containing the number list.
protected  void setValueAsString(List value)
          Sets the DOM attribute value to be the string representation of the given list.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

valid

protected boolean valid
Whether this list is valid.


itemList

protected List itemList
The list of items.

Constructor Detail

AbstractSVGList

public AbstractSVGList()
Method Detail

getItemSeparator

protected abstract String getItemSeparator()
Returns the separator string to use when constructing a string representation of the entire list.


createSVGItem

protected abstract SVGItem createSVGItem(Object newItem)
Creates an SVGItem object that has the same values as those in the specified SVG object.

Parameters:
newItem - the SVG object
Returns:
the newly created SVGItem object

doParse

protected abstract void doParse(String value,
                                ListHandler builder)
                         throws ParseException
Parses the given attribute value and informs the specified ListHandler of the parsed list items.

Parameters:
value - the attribute value to be parsed
builder - the object to be informed of the parsed list items
Throws:
ParseException

checkItemType

protected abstract void checkItemType(Object newItem)
                               throws org.w3c.dom.svg.SVGException
Asserts that the given object is an appropriate SVG object for this list.

Throws:
org.w3c.dom.svg.SVGException

getValueAsString

protected abstract String getValueAsString()
Returns the value of the DOM attribute containing the list.


setAttributeValue

protected abstract void setAttributeValue(String value)
Sets the DOM attribute value containing the number list.

Parameters:
value - the String representation of the list, or null if the list contains no items

createDOMException

protected abstract DOMException createDOMException(short type,
                                                   String key,
                                                   Object[] args)
Create a DOM Exception.


getNumberOfItems

public int getNumberOfItems()
Returns the number of items in the list.


clear

public void clear()
           throws DOMException
Removes all items from the list.

Throws:
DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the list cannot be modified.

initializeImpl

protected SVGItem initializeImpl(Object newItem)
                          throws DOMException,
                                 org.w3c.dom.svg.SVGException
Removes all items from the list and adds the specified item to the list.

Parameters:
newItem - the item which should become the only member of the list.
Returns:
the item being inserted into the list.
Throws:
DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the list cannot be modified.
org.w3c.dom.svg.SVGException - SVG_WRONG_TYPE_ERR: Raised if parameter newItem is the wrong type of object for the given list.

getItemImpl

protected SVGItem getItemImpl(int index)
                       throws DOMException
Returns the item from the list at the specified index.

Parameters:
index - The index of the item from the list which is to be returned. The first item is number 0.
Returns:
The selected item.
Throws:
DOMException - INDEX_SIZE_ERR: Raised if the index number is negative or greater than or equal to numberOfItems.

insertItemBeforeImpl

protected SVGItem insertItemBeforeImpl(Object newItem,
                                       int index)
                                throws DOMException,
                                       org.w3c.dom.svg.SVGException
Inserts a new item into the list at the specified position.

The first item is number 0. If newItem is already in a list, it is removed from its previous list before it is inserted into this list.

Parameters:
newItem - The item which is to be inserted into the list.
index - The index of the item before which the new item is to be inserted. The first item is number 0. If the index is equal to 0, then the new item is inserted at the front of the list. If the index is greater than or equal to numberOfItems, then the new item is appended to the end of the list.
Returns:
The inserted item.
Throws:
DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the list cannot be modified.
org.w3c.dom.svg.SVGException - SVG_WRONG_TYPE_ERR: Raised if parameter newItem is the wrong type of object for the given list.

replaceItemImpl

protected SVGItem replaceItemImpl(Object newItem,
                                  int index)
                           throws DOMException,
                                  org.w3c.dom.svg.SVGException
Replaces an existing item in the list with a new item.

If newItem is already in a list, it is removed from its previous list before it is inserted into this list.

Parameters:
newItem - The item which is to be inserted into the list.
index - The index of the item which is to be replaced. The first item is number 0.
Returns:
The inserted item.
Throws:
DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the list cannot be modified.
DOMException - INDEX_SIZE_ERR: Raised if the index number is negative or greater than or equal to numberOfItems.
org.w3c.dom.svg.SVGException - SVG_WRONG_TYPE_ERR: Raised if parameter newItem is the wrong type of object for the given list.

removeItemImpl

protected SVGItem removeItemImpl(int index)
                          throws DOMException
Removes an existing item from the list.

Parameters:
index - The index of the item which is to be removed. The first item is number 0.
Returns:
The removed item.
Throws:
DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the list cannot be modified.
DOMException - INDEX_SIZE_ERR: Raised if the index number is negative or greater than or equal to numberOfItems.

appendItemImpl

protected SVGItem appendItemImpl(Object newItem)
                          throws DOMException,
                                 org.w3c.dom.svg.SVGException
Inserts a new item at the end of the list. If newItem is already in a list, it is removed from its previous list before it is inserted into this list.

Parameters:
newItem - The item which is to be inserted into the list. The first item is number 0.
Returns:
The inserted item.
Throws:
DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the list cannot be modified.
org.w3c.dom.svg.SVGException - SVG_WRONG_TYPE_ERR: Raised if parameter newItem is the wrong type of object for the given list.

removeIfNeeded

protected SVGItem removeIfNeeded(Object newItem)
Removes the specified object from its parent list if it is an item, or creates a new item if the specified object is not an item.

Parameters:
newItem - an instance of SVGItem to remove from its parent list, or an SVG object for which a new SVGItem should be created
Returns:
item the SVGItem just removed from its parent list, or the newly created SVGItem

revalidate

protected void revalidate()
Initializes the list, if needed.


setValueAsString

protected void setValueAsString(List value)
                         throws DOMException
Sets the DOM attribute value to be the string representation of the given list.

Throws:
DOMException

itemChanged

public void itemChanged()
Method to be called by a member SVGItem object when its value changes. This causes the DOM attribute to be reset.


resetAttribute

protected void resetAttribute()
Resets the value of the associated attribute.


resetAttribute

protected void resetAttribute(SVGItem item)
Appends the string representation of the given SVGItem to the DOM attribute. This is called in response to an append to the list.


invalidate

public void invalidate()
Invalidates this list.


removeItem

protected void removeItem(SVGItem item)
Removes an item from the list. This operation takes place when an item was already in one list and is being added to another one.


clear

protected void clear(List list)
Clears the list and sets the parent of the former list items to null.



Copyright © 2008 Apache Software Foundation. All Rights Reserved.