getnarrowerbroader.java

联合国农粮署牵头开发的geonetwork源代码最新版

//=============================================================================
//===	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.thesaurus;

import jeeves.constants.Jeeves;
import jeeves.interfaces.Service;
import jeeves.server.ServiceConfig;
import jeeves.server.UserSession;
import jeeves.server.context.ServiceContext;
import jeeves.utils.Util;
import jeeves.utils.Log;

import org.fao.geonet.GeonetContext;
import org.fao.geonet.constants.Geonet;
import org.fao.geonet.kernel.ThesaurusManager;
import org.fao.geonet.kernel.search.KeywordsSearcher;
import org.jdom.Element;

/**
 * Returns a list of keywords given a list of thesaurus
 */

public class GetNarrowerBroader implements Service {
	public void init(String appPath, ServiceConfig params) throws Exception {
	}

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

	public Element exec(Element params, ServiceContext context)
			throws Exception {
		Element response = new Element(Jeeves.Elem.RESPONSE);
		UserSession session = context.getUserSession();

		KeywordsSearcher searcher = null;
		
			
		// perform the search and save search result into session
		// Creation d'un nouveau Keyword searcher
		// Recup閞ation du thesaurus manager
		GeonetContext gc = (GeonetContext) context
				.getHandlerContext(Geonet.CONTEXT_NAME);
		ThesaurusManager thesaurusMan = gc.getThesaurusManager();
			
		Log.debug("KeywordsManager","Creating new keywords searcher");
		searcher = new KeywordsSearcher(thesaurusMan);
		
		String request = Util.getParam(params, "request");
		
		if (request.equals("broader") 
				|| request.equals("narrower")
				|| request.equals("related")) {
			String reqType;
			
			if(request.equals("broader"))		// If looking for broader search concept in a narrower element
				reqType = "narrower";
			else if(request.equals("narrower"))
				reqType = "broader";
			else 
				reqType = "related";
			
			searcher.searchBN(context, params, reqType);
		
			searcher.sortResults("label");
			
			// Build response
			Element keywordType = new Element(reqType);
			keywordType.addContent(searcher.getResults(params));
			response.addContent(keywordType);
		}else  
			throw new Exception("unknown request type: " + request);
			
		
		return response;
	}
}

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