/*
BEGIN LICENSE BLOCK
Copyright 2010-2011, Heiko Mueller, Sam Lindley, James Cheney and
University of Edinburgh
This file is part of Database Wiki.
Database Wiki is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Database Wiki is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Database Wiki. If not, see <http://www.gnu.org/licenses/>.
END LICENSE BLOCK
*/
package org.dbwiki.data.io;
import java.util.Stack;
import org.dbwiki.data.document.PasteAttributeNode;
import org.dbwiki.data.document.PasteDatabaseInfo;
import org.dbwiki.data.document.PasteGroupNode;
import org.dbwiki.data.document.PasteNode;
import org.dbwiki.data.document.PasteTextNode;
import org.dbwiki.exception.WikiFatalException;
/** An InputHandler that provides callbacks to parse in
* an XML document that was generated by CopyPasteNodeWriter,
* and construct a PasteNode containing the data.
* FIXME #copypaste Avoid PasteNode.
* @author jcheney
*
*/
public class CopyPasteInputHandler implements InputHandler {
/*
* Private Variables
*/
private PasteDatabaseInfo _databaseInfo;
private Exception _exception;
private Stack<PasteNode> _readStack;
private PasteNode _root = null;
/*
* Public Methods
*/
public void exception(Exception excpt) {
_exception = excpt;
}
public Exception getException() {
return _exception;
}
public PasteNode getPasteNode() {
return _root;
}
public boolean hasException() {
return (_exception != null);
}
public void startDocument() throws org.dbwiki.exception.WikiException {
_databaseInfo = null;
_readStack = new Stack<PasteNode>();
_root = null;
}
public void endDocument() throws org.dbwiki.exception.WikiException {
if (!_readStack.isEmpty()) {
throw new WikiFatalException("Invalid document format");
}
}
public void startElement(String label) throws org.dbwiki.exception.WikiException {
throw new WikiFatalException("Invalid method call: " + this.getClass().getName() + ".startElement(" + label + ")");
}
public void startElement(String label, Attribute[] attrs) throws org.dbwiki.exception.WikiException {
if ((label.equals(CopyPasteConstants.ElementLabelDatabase)) && (attrs.length == 2) && (_databaseInfo == null)) {
String name = this.getAttribute(attrs, CopyPasteConstants.AttributeLabelDatabaseName).value();
int version = Integer.parseInt(this.getAttribute(attrs, CopyPasteConstants.AttributeLabelVersion).value());
_databaseInfo = new PasteDatabaseInfo(name, version);
} else if ((label.equals(CopyPasteConstants.ElementLabelNode)) && (attrs.length == 2) && (_databaseInfo != null)) {
if (Integer.parseInt(this.getAttribute(attrs, CopyPasteConstants.AttributeLabelType).value()) == CopyPasteConstants.NodeTypeText) {
PasteTextNode node = new PasteTextNode(_databaseInfo);
if (_root == null) {
_root = node;
} else {
((PasteAttributeNode)_readStack.peek()).setValue(node);
}
_readStack.push(node);
} else {
throw new WikiFatalException("Invalid node type in copy & paste data stream");
}
} else if ((label.equals(CopyPasteConstants.ElementLabelNode)) && (attrs.length == 3) && (_databaseInfo != null)) {
int type = Integer.parseInt(this.getAttribute(attrs, CopyPasteConstants.AttributeLabelType).value());
String schemaName = this.getAttribute(attrs, CopyPasteConstants.AttributeLabelSchemaNodeName).value();
PasteNode node = null;
if (type == CopyPasteConstants.NodeTypeAttribute) {
node = new PasteAttributeNode(_databaseInfo, schemaName);
} else if (type == CopyPasteConstants.NodeTypeGroup) {
node = new PasteGroupNode(_databaseInfo, schemaName);
} else {
throw new WikiFatalException("Invalid node type in copy & paste data stream");
}
if (_root == null) {
_root = node;
} else {
((PasteGroupNode)_readStack.peek()).children().add(node);
}
_readStack.push(node);
} else {
throw new WikiFatalException("Invalid element in copy & paste data stream");
}
}
public void endElement(String label) throws org.dbwiki.exception.WikiException {
if (label.equals(CopyPasteConstants.ElementLabelNode)) {
_readStack.pop();
}
}
public void text(char[] value) throws org.dbwiki.exception.WikiException {
String text = new String(value);
if (!text.trim().equals("")) {
((PasteTextNode)_readStack.peek()).setValue(text);
}
}
/*
* Private Methods
*/
private Attribute getAttribute(Attribute[] attrs, String name) throws org.dbwiki.exception.WikiException {
for (int iAttr = 0; iAttr < attrs.length; iAttr++) {
if (attrs[iAttr].name().equals(name)) {
return attrs[iAttr];
}
}
throw new WikiFatalException("Missing attribute " + name);
}
}