get.java.svn-base

由国外的一个著名的geonetwork修改而来

//=============================================================================
//===	Copyright (C) 2001-2005 Food and Agriculture Organization of the
//===	United Nations (FAO-UN), United Nations World Food Programme (WFP)
//===	and United Nations Environment Programme (UNEP)
//===
//===	This program 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 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
//===	General Public License for more details.
//===
//===	You should have received a copy of the GNU General Public License
//===	along with this program; if not, write to the Free Software
//===	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//===
//===	Contact: Jeroen Ticheler - FAO - Viale delle Terme di Caracalla 2,
//===	Rome - Italy. email: [e-mail]
//==============================================================================

package org.fao.geonet.services.thumbnail;

import java.util.List;
import jeeves.interfaces.Service;
import jeeves.resources.dbms.Dbms;
import jeeves.server.ServiceConfig;
import jeeves.server.context.ServiceContext;
import jeeves.utils.Util;
import org.fao.geonet.GeonetContext;
import org.fao.geonet.constants.Geonet;
import org.fao.geonet.constants.Params;
import org.fao.geonet.kernel.DataManager;
import org.fao.geonet.services.metadata.Update;
import org.jdom.Element;

//=============================================================================

public class Get implements Service
{
	private Update  update = new Update();

	//--------------------------------------------------------------------------
	//---
	//--- Init
	//---
	//--------------------------------------------------------------------------

	public void init(String appPath, ServiceConfig params) throws Exception
	{
		update.init(appPath, params);
	}

	//--------------------------------------------------------------------------
	//---
	//--- Service
	//---
	//--------------------------------------------------------------------------

	public Element exec(Element params, ServiceContext context) throws Exception
	{
		//--- store changed fields if we arrive here from the editing form
		//--- the update service uses the following parameters:
		//--- id, data, validate, currTab, version

		if (saveEditData(params))
			//--- data is not saved if someone else has changed the metadata
			update.exec(params, context);

		GeonetContext gc = (GeonetContext) context.getHandlerContext(Geonet.CONTEXT_NAME);

		DataManager dataMan = gc.getDataManager();

		Dbms dbms = (Dbms) context.getResourceManager().open(Geonet.Res.MAIN_DB);

		String id = Util.getParam(params, Params.ID);

		//-----------------------------------------------------------------------
		//--- get metadata

		Element result = dataMan.getThumbnails(dbms, id);

		if (result == null)
			throw new IllegalArgumentException("Metadata not found --> " + id);

		result.addContent(new Element("version").setText(dataMan.getNewVersion(id)));

		return result;
	}

	//--------------------------------------------------------------------------
	//---
	//--- Private methods
	//---
	//--------------------------------------------------------------------------

	private boolean saveEditData(Element params)
	{
		List list = params.getChildren();

		for(int i=0; i<list.size(); i++)
		{
			Element el = (Element) list.get(i);

			if (el.getName().startsWith("_"))
				return true;
		}

		return false;
	}
}

//=============================================================================