/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2010 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
 *
 *  $Id$
 */
package org.exist.ant;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;

import org.xmldb.api.DatabaseManager;
import org.xmldb.api.base.Collection;
import org.xmldb.api.base.Resource;
import org.xmldb.api.base.XMLDBException;
import org.xmldb.api.modules.XUpdateQueryService;


/**
 * an ant task to update a collection or resource using XUpdate.
 *
 * @author  peter.klotz@blue-elephant-systems.com
 */
public class XMLDBXUpdateTask extends AbstractXMLDBTask
{
    private String resource = null;
    private String commands = null;

    /* (non-Javadoc)
     * @see org.apache.tools.ant.Task#execute()
     */
    public void execute() throws BuildException
    {
        if( uri == null ) {
            throw( new BuildException( "You have to specify an XMLDB collection URI" ) );
        }

        log( "XUpdate command is: " + commands, Project.MSG_DEBUG );
        registerDatabase();

        try {
            log( "Get base collection: " + uri, Project.MSG_DEBUG );
            final Collection base = DatabaseManager.getCollection( uri, user, password );

            if( base == null ) {
                final String msg = "Collection " + uri + " could not be found.";

                if( failonerror ) {
                    throw( new BuildException( msg ) );
                } else {
                    log( msg, Project.MSG_ERR );
                }

            } else {
                final XUpdateQueryService service = (XUpdateQueryService)base.getService( "XUpdateQueryService", "1.0" );

                if( resource != null ) {
                    log( "Updating resource: " + resource, Project.MSG_INFO );
                    final Resource res = base.getResource( resource );

                    if( res == null ) {
                        final String msg = "Resource " + resource + " not found.";

                        if( failonerror ) {
                            throw( new BuildException( msg ) );
                        } else {
                            log( msg, Project.MSG_ERR );
                        }
                    } else {
                        service.updateResource( resource, commands );
                    }

                } else {
                    log( "Updating collection: " + base.getName(), Project.MSG_INFO );
                    service.update( commands );
                }
            }

        }
        catch( final XMLDBException e ) {
            final String msg = "XMLDB exception during XUpdate: " + e.getMessage();

            if( failonerror ) {
                throw( new BuildException( msg, e ) );
            } else {
                log( msg, e, Project.MSG_ERR );
            }
        }
    }


    /**
     * DOCUMENT ME!
     *
     * @param  resource
     */
    public void setResource( String resource )
    {
        this.resource = resource;
    }


    public void setCommands( String commands )
    {
        this.commands = commands;
    }
}