Abstract "CharacterData" implementation. This * facilitates reusing code in classes implementing subtypes of that DOM * interface (Text, Comment, CDATASection).
* * @author David Brownell * @author Chris Burdess */ public abstract class DomCharacterData extends DomNode implements CharacterData { /** * Empty node list representing the children of character data nodes. */ static class EmptyNodeList implements NodeList { public int getLength() { return 0; } public Node item(int index) { return null; } } /** * Singleton empty node list for character data nodes. */ static final NodeList CHILD_NODES = new EmptyNodeList(); private String text; // package private DomCharacterData(short nodeType, DomDocument doc, String value) { super(nodeType, doc); text = (value == null) ? "" : value; } // package private DomCharacterData(short nodeType, DomDocument doc, char[] buf, int offset, int length) { super(nodeType, doc); text = (buf == null) ? "" : new String(buf, offset, length); } /** * DOM L1 * Appends the specified data to the value of this node. * Causes a DOMCharacterDataModified mutation event to be reported. */ public void appendData(String arg) { if (isReadonly()) { throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR); } String value = text + arg; mutating(value); text = value; } /** * DOM L1 * Modifies the value of this node. * Causes a DOMCharacterDataModified mutation event to be reported. */ public void deleteData(int offset, int count) { if (isReadonly()) { throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR); } char[] raw = text.toCharArray(); if (offset < 0 || count < 0 || offset > raw.length) { throw new DomDOMException(DOMException.INDEX_SIZE_ERR); } if ((offset + count) > raw.length) { count = raw.length - offset; } if (count == 0) { return; } try { char[] buf = new char[raw.length - count]; System.arraycopy(raw, 0, buf, 0, offset); System.arraycopy(raw, offset + count, buf, offset, raw.length - (offset + count)); String value = new String(buf); mutating(value); text = value; } catch (IndexOutOfBoundsException x) { throw new DomDOMException(DOMException.INDEX_SIZE_ERR); } } /** * DOM L1 * Returns the value of this node. */ public String getNodeValue() { return text; } /** * DOM L1 * Returns the value of this node; same as getNodeValue. */ public final String getData() { return text; } /** * DOM L1 * Returns the length of the data. */ public int getLength() { return text.length(); } /** * DOM L1 * Modifies the value of this node. */ public void insertData(int offset, String arg) { if (isReadonly()) { throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR); } char[] raw = text.toCharArray(); char[] tmp = arg.toCharArray (); char[] buf = new char[raw.length + tmp.length]; try { System.arraycopy(raw, 0, buf, 0, offset); System.arraycopy(tmp, 0, buf, offset, tmp.length); System.arraycopy(raw, offset, buf, offset + tmp.length, raw.length - offset); String value = new String(buf); mutating(value); text = value; } catch (IndexOutOfBoundsException x) { throw new DomDOMException(DOMException.INDEX_SIZE_ERR); } } /** * DOM L1 * Modifies the value of this node. Causes DOMCharacterDataModified * mutation events to be reported (at least one). */ public void replaceData(int offset, int count, String arg) { if (readonly) { throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR); } char[] raw = text.toCharArray(); // deleteData if (offset < 0 || count < 0 || offset > raw.length) { throw new DomDOMException(DOMException.INDEX_SIZE_ERR); } if ((offset + count) > raw.length) { count = raw.length - offset; } try { char[] buf = new char[raw.length - count]; System.arraycopy(raw, 0, buf, 0, offset); System.arraycopy(raw, offset + count, buf, offset, raw.length - (offset + count)); // insertData char[] tmp = arg.toCharArray (); char[] buf2 = new char[buf.length + tmp.length]; System.arraycopy(raw, 0, buf, 0, offset); System.arraycopy(tmp, 0, buf, offset, tmp.length); System.arraycopy(raw, offset, buf, offset + tmp.length, raw.length - offset); String value = new String(buf); mutating(value); text = value; } catch (IndexOutOfBoundsException x) { throw new DomDOMException(DOMException.INDEX_SIZE_ERR); } } /** * DOM L1 * Assigns the value of this node. * Causes a DOMCharacterDataModified mutation event to be reported. */ public void setNodeValue(String value) { if (isReadonly()) { throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR); } if (value == null) { value = ""; } mutating(value); text = value; } /** * DOM L1 * Assigns the value of this node; same as setNodeValue. */ final public void setData(String data) { setNodeValue(data); } /** * DOM L1 * Returns the specified substring. */ public String substringData(int offset, int count) { try { return text.substring(offset, count); } catch (StringIndexOutOfBoundsException e) { if (offset >= 0 && count >= 0 && offset < text.length()) { return text.substring(offset); } throw new DomDOMException(DOMException.INDEX_SIZE_ERR); } } /** * Returns an empty node list. * Character data nodes do not have children. */ public NodeList getChildNodes() { return CHILD_NODES; } /** * The base URI for character data isnull.
* @since DOM Level 3 Core
*/
public final String getBaseURI()
{
return null;
}
private void mutating(String newValue)
{
if (!reportMutations)
{
return;
}
// EVENT: DOMCharacterDataModified, target = this,
// prev/new values provided
MutationEvent event;
event = (MutationEvent) createEvent("MutationEvents");
event.initMutationEvent("DOMCharacterDataModified",
true /* bubbles */, false /* nocancel */,
null, text, newValue, null, (short) 0);
dispatchEvent(event);
}
}