org.exist.xupdate.Update Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of exist-core Show documentation
eXist-db NoSQL Database Core
There is a newer version: 6.3.0
/*
 * eXist-db Open Source Native XML Database
 * Copyright (C) 2001 The eXist-db Authors
 *
 * [email protected]
 * http://www.exist-db.org
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.exist.xupdate;

import org.exist.dom.persistent.AttrImpl;
import org.exist.dom.persistent.ElementImpl;
import org.exist.dom.persistent.TextImpl;
import org.exist.dom.persistent.DocumentImpl;
import org.exist.dom.persistent.DocumentSet;
import org.exist.dom.persistent.StoredNode;
import java.util.Map;

import org.exist.EXistException;
import org.exist.collections.triggers.TriggerException;
import org.exist.security.Permission;
import org.exist.security.PermissionDeniedException;
import org.exist.storage.DBBroker;
import org.exist.storage.NotificationService;
import org.exist.storage.UpdateListener;
import org.exist.storage.txn.Txn;
import org.exist.util.LockException;
import org.exist.xquery.XPathException;
import org.w3c.dom.Attr;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * Implements the XUpdate update modification.
 * 
 * @author wolf
 */
public class Update extends Modification {

    /**
     * @param broker the database broker.
     * @param docs the document working set.
     * @param selectStmt the select statement.
     * @param namespaces the namespaces.
     * @param variables the variables.
     */
    public Update(DBBroker broker, DocumentSet docs, String selectStmt,
            Map namespaces, Map variables) {
        super(broker, docs, selectStmt, namespaces, variables);
    }

    @Override
    public long process(Txn transaction) throws PermissionDeniedException, LockException,
            EXistException, XPathException, TriggerException {
        final NodeList children = content;
        if (children.getLength() == 0) 
            {return 0;}
        int modifications = children.getLength();
        try {
            final StoredNode ql[] = selectAndLock(transaction);
            final NotificationService notifier = broker.getBrokerPool().getNotificationService();
            for (final StoredNode node : ql) {
                if (node == null) {
                    LOG.warn("select {} returned empty node", selectStmt);
                    continue;
                }
                final DocumentImpl doc = node.getOwnerDocument();
                if (!doc.getPermissions().validate(broker.getCurrentSubject(), Permission.WRITE)) {
                    throw new PermissionDeniedException("User '" + broker.getCurrentSubject().getName() + "' does not have permission to write to the document '" + doc.getDocumentURI() + "'!");
                }
                switch (node.getNodeType()) {
                    case Node.ELEMENT_NODE:
                        if (modifications == 0) {
                            modifications = 1;
                        }
                        ((ElementImpl) node).update(transaction, children);
                        break;

                    case Node.TEXT_NODE:
                        final ElementImpl textParent = (ElementImpl) node.getParentNode();
                        final Node textTemp = children.item(0);
                        final TextImpl text = new TextImpl(textTemp.getNodeValue());
                        modifications = 1;
                        text.setOwnerDocument(doc);
                        textParent.updateChild(transaction, node, text);
                        break;

                    case Node.ATTRIBUTE_NODE:
                        final ElementImpl attrParent = (ElementImpl) ((Attr) node).getOwnerElement();
                        if (attrParent == null) {
                            LOG.warn("parent node not found for {}", node.getNodeId());
                            break;
                        }
                        final AttrImpl attr = (AttrImpl) node;
                        final Node attrTemp = children.item(0);
                        final AttrImpl attribute = new AttrImpl(attr.getQName(), attrTemp.getNodeValue(), broker.getBrokerPool().getSymbols());
                        attribute.setOwnerDocument(doc);
                        attrParent.updateChild(transaction, node, attribute);
                        break;

                    default:
                        throw new EXistException("unsupported node-type");
                }
                doc.setLastModified(System.currentTimeMillis());
                modifiedDocuments.add(doc);
                broker.storeXMLResource(transaction, doc);
                notifier.notifyUpdate(doc, UpdateListener.UPDATE);
            }
            checkFragmentation(transaction, modifiedDocuments);
        } finally {
            unlockDocuments(transaction);
        }
        return modifications;
    }

    @Override
    public String getName() {
        return XUpdateProcessor.UPDATE;
    }

}