org.apache.xerces.dom
Class CharacterDataImpl

java.lang.Object
  |
  +--org.apache.xerces.dom.NodeImpl
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        +--org.apache.xerces.dom.ChildNode
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              +--org.apache.xerces.dom.CharacterDataImpl

Direct Known Subclasses:

CommentImpl, ProcessingInstructionImpl, TextImpl

public abstract class CharacterDataImpl

extends ChildNode

CharacterData is an abstract Node that can carry character data as its Value. It provides shared behavior for Text, CData, and possibly other node types. All offsets are 0-based.

Since ProcessingInstructionImpl inherits from this class to reuse the setNodeValue method, this class isn't declared as implementing the interface CharacterData. This is done by relevant subclasses (TexImpl, CommentImpl).

This class doesn't directly support mutation events, however, it notifies the document when mutations are performed so that the document class do so.

Since:

PR-DOM-Level-1-19980818.

Version:

See Also:

Serialized Form

Field Summary

protected java.lang.String

data

Fields inherited from class org.apache.xerces.dom.ChildNode

nextSibling, previousSibling

Fields inherited from class org.apache.xerces.dom.NodeImpl

ELEMENT_DEFINITION_NODE, FIRSTCHILD, flags, HASSTRING, IGNORABLEWS, OWNED, ownerNode, READONLY, SPECIFIED, SYNCCHILDREN, SYNCDATA, UNNORMALIZED

Constructor Summary

protected

CharacterDataImpl(CoreDocumentImpl ownerDocument, java.lang.String data) Factory constructor.

Method Summary

void	appendData(java.lang.String data) Concatenate additional characters onto the end of the data stored in this node.
void	deleteData(int offset, int count) Remove a range of characters from the node's value.
NodeList	getChildNodes() Returns an empty node list.
java.lang.String	getData() Retrieve character data currently stored in this node.
int	getLength() Report number of characters currently stored in this node's data.
java.lang.String	getNodeValue() Returns the node value.
void	insertData(int offset, java.lang.String data) Insert additional characters into the data stored in this node, at the offset specified.
void	replaceData(int offset, int count, java.lang.String data) Replace a series of characters at the specified (zero-based) offset with a new string, NOT necessarily of the same length.
void	setData(java.lang.String value) Store character data into this node.
void	setNodeValue(java.lang.String value) Sets the content, possibly firing related events, and updating ranges (via notification to the document)
protected void	setNodeValueInternal(java.lang.String value) This function added so that we can distinguish whether setNodeValue has been called from some other DOM functions.
java.lang.String	substringData(int offset, int count) Substring is more than a convenience function.

Methods inherited from class org.apache.xerces.dom.ChildNode

cloneNode, getNextSibling, getParentNode, getPreviousSibling

Methods inherited from class org.apache.xerces.dom.NodeImpl

addEventListener, appendChild, changed, changes, dispatchEvent, getAttributes, getFirstChild, getLastChild, getLocalName, getNamespaceURI, getNodeName, getNodeType, getOwnerDocument, getPrefix, getReadOnly, getUserData, hasAttributes, hasChildNodes, insertBefore, isSupported, item, normalize, removeChild, removeEventListener, replaceChild, setPrefix, setReadOnly, setUserData, synchronizeData, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

data

protected java.lang.String data

Constructor Detail

CharacterDataImpl

protected CharacterDataImpl(CoreDocumentImpl ownerDocument,
                            java.lang.String data)

Factory constructor.

Method Detail

getChildNodes

public NodeList getChildNodes()

Returns an empty node list.

Overrides:

getChildNodes in class NodeImpl

getNodeValue

public java.lang.String getNodeValue()

Description copied from class: NodeImpl

Returns the node value.

Overrides:

getNodeValue in class NodeImpl

Tags copied from interface: Node

Throws:

DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.

DOMException - DOMSTRING_SIZE_ERR: Raised when it would return more characters than fit in a DOMString variable on the implementation platform.

setNodeValueInternal

protected void setNodeValueInternal(java.lang.String value)

This function added so that we can distinguish whether setNodeValue has been called from some other DOM functions. or by the client.

This is important, because we do one type of Range fix-up, from the high-level functions in CharacterData, and another type if the client simply calls setNodeValue(value).

setNodeValue

public void setNodeValue(java.lang.String value)

Sets the content, possibly firing related events, and updating ranges (via notification to the document)

Overrides:

setNodeValue in class NodeImpl

Tags copied from class: NodeImpl

Throws:

DOMException(NO_MODIFICATION_ALLOWED_ERR) -

getData

public java.lang.String getData()

Retrieve character data currently stored in this node.

Throws:

DOMExcpetion(DOMSTRING_SIZE_ERR) - In some implementations, the stored data may exceed the permitted length of strings. If so, getData() will throw this DOMException advising the user to instead retrieve the data in chunks via the substring() operation.

getLength

public int getLength()

Report number of characters currently stored in this node's data. It may be 0, meaning that the value is an empty string.

Overrides:

getLength in class NodeImpl

Tags copied from class: NodeImpl

Returns:

int

See Also:

ParentNode

appendData

public void appendData(java.lang.String data)

Concatenate additional characters onto the end of the data stored in this node. Note that this, and insert(), are the paths by which a DOM could wind up accumulating more data than the language's strings can easily handle. (See above discussion.)

Throws:

DOMException(NO_MODIFICATION_ALLOWED_ERR) - if node is readonly.

deleteData

public void deleteData(int offset,
                       int count)
                throws DOMException

Remove a range of characters from the node's value. Throws a DOMException if the offset is beyond the end of the string. However, a deletion _count_ that exceeds the available data is accepted as a delete-to-end request.

Throws:

DOMException(INDEX_SIZE_ERR) - if offset is negative or greater than length, or if count is negative.

DOMException(NO_MODIFICATION_ALLOWED_ERR) - if node is readonly.

insertData

public void insertData(int offset,
                       java.lang.String data)
                throws DOMException

Insert additional characters into the data stored in this node, at the offset specified.

Throws:

DOMException(INDEX_SIZE_ERR) - if offset is negative or greater than length.

DOMException(NO_MODIFICATION_ALLOWED_ERR) - if node is readonly.

replaceData

public void replaceData(int offset,
                        int count,
                        java.lang.String data)
                 throws DOMException

Replace a series of characters at the specified (zero-based) offset with a new string, NOT necessarily of the same length. Convenience method, equivalent to a delete followed by an insert. Throws a DOMException if the specified offset is beyond the end of the existing data.

Parameters:

offset - The offset at which to begin replacing.

count - The number of characters to remove, interpreted as in the delete() method.

data - The new string to be inserted at offset in place of the removed data. Note that the entire string will be inserted -- the count parameter does not affect insertion, and the new data may be longer or shorter than the substring it replaces.

Throws:

DOMException(INDEX_SIZE_ERR) - if offset is negative or greater than length, or if count is negative.

DOMException(NO_MODIFICATION_ALLOWED_ERR) - if node is readonly.

setData

public void setData(java.lang.String value)
             throws DOMException

Store character data into this node.

Throws:

DOMException(NO_MODIFICATION_ALLOWED_ERR) - if node is readonly.

substringData

public java.lang.String substringData(int offset,
                                      int count)
                               throws DOMException

Substring is more than a convenience function. In some implementations of the DOM, where the stored data may exceed the length that can be returned in a single string, the only way to read it all is to extract it in chunks via this method.

Parameters:

offset - Zero-based offset of first character to retrieve.

count - Number of characters to retrieve. If the sum of offset and count exceeds the length, all characters to end of data are returned.

Throws:

DOMException(INDEX_SIZE_ERR) - if offset is negative or greater than length, or if count is negative.

DOMException(WSTRING_SIZE_ERR) - In some implementations, count may exceed the permitted length of strings. If so, substring() will throw this DOMException advising the user to instead retrieve the data in smaller chunks.