/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-2015 The eXist Project
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.exist.indexing;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.exist.dom.persistent.AttrImpl;
import org.exist.dom.persistent.ElementImpl;
import org.exist.dom.persistent.IStoredNode;
import org.exist.dom.persistent.TextImpl;
import org.exist.storage.DBBroker;
import org.exist.storage.NodePath;
import org.exist.storage.dom.INodeIterator;
import org.exist.storage.txn.Txn;
import org.w3c.dom.Node;
import java.io.IOException;
/**
* Various utility methods to be used by Index implementations.
*/
public class IndexUtils {
protected static final Logger LOG = LogManager.getLogger(IndexUtils.class);
public static void scanNode(DBBroker broker, Txn transaction, IStoredNode node, StreamListener listener) {
try(final INodeIterator iterator = broker.getNodeIterator(node)) {
iterator.next();
final NodePath path = node.getPath();
scanNode(transaction, iterator, node, listener, path);
} catch(final IOException ioe) {
LOG.warn("Unable to close iterator", ioe);
}
}
private static void scanNode(Txn transaction, INodeIterator iterator,
IStoredNode node, StreamListener listener, NodePath currentPath) {
switch (node.getNodeType()) {
case Node.ELEMENT_NODE:
if (listener != null) {
listener.startElement(transaction, (ElementImpl) node, currentPath);
}
if (node.hasChildNodes()) {
final int childCount = node.getChildCount();
for (int i = 0; i < childCount; i++) {
final IStoredNode child = iterator.next();
if (child.getNodeType() == Node.ELEMENT_NODE)
{currentPath.addComponent(child.getQName());}
scanNode(transaction, iterator, child, listener, currentPath);
if (child.getNodeType() == Node.ELEMENT_NODE)
{currentPath.removeLastComponent();}
}
}
if (listener != null) {
listener.endElement(transaction, (ElementImpl) node, currentPath);
}
break;
case Node.TEXT_NODE :
if (listener != null) {
listener.characters(transaction, (TextImpl) node, currentPath);
}
break;
case Node.ATTRIBUTE_NODE :
if (listener != null) {
listener.attribute(transaction, (AttrImpl) node, currentPath);
}
break;
}
}
}