package org.kxml.kdom;
import java.util.*;
import java.io.*;
import org.kxml.*;
import org.kxml.io.*;
import org.kxml.parser.*;
/** The document consists of some legacy events and a single root
element. This class basically adds some consistency checks to
Node. */
public class Document extends Node {
protected int rootIndex = -1;
/** returns "#document" */
public String getName () {
return "#document";
}
/** Adds a child at the given index position. Throws
an exception when a second root element is added */
public void addChild (int index, int type, Object child) {
if (type == Xml.ELEMENT) {
if (rootIndex != -1)
throw new RuntimeException
("Only one document root element allowed");
rootIndex = index;
}
else if (rootIndex >= index) rootIndex++;
super.addChild (index, type, child);
}
/** reads the document and checks if the last event
is END_DOCUMENT. If not, an exception is thrown.
The end event is consumed. For parsing partial
XML structures, consider using Node.parse (). */
public void parse (AbstractXmlParser parser) throws IOException {
super.parse (parser);
if (parser.read ().getType () != Xml.END_DOCUMENT)
throw new RuntimeException ("Document end expected!");
}
public void removeChild (int index) {
if (index == rootIndex) rootIndex = -1;
else if (index < rootIndex) rootIndex--;
super.removeChild (index);
}
/** returns the root element of this document. */
public Element getRootElement () {
if (rootIndex == -1)
throw new RuntimeException ("Document has no root element!");
return (Element) getChild (rootIndex);
}
}
