source: main/trunk/greenstone3/src/java/org/greenstone/gsdl3/service/ServiceUtil.java@ 28966

package org.greenstone.gsdl3.service;

import java.io.File;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;

import org.apache.log4j.Logger;
import org.greenstone.gsdl3.util.GSXML;
import org.greenstone.gsdl3.util.XMLConverter;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class ServiceUtil extends ServiceRack
{
    static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.ServiceUtil.class.getName());
    
    /**********************************************************
     * The list of services the utility service rack supports *
     *********************************************************/
    protected static final String GET_ALL_IMAGES_IN_COLLECTION = "GetAllImagesInCollection";
    /*********************************************************/
    
    String[] services = { GET_ALL_IMAGES_IN_COLLECTION };
    
    public boolean configure(Element info, Element extra_info)
    {
        if (!super.configure(info, extra_info))
        {
            return false;
        }

        logger.info("Configuring ServiceUtil...");
        this.config_info = info;

        for (int i = 0; i < services.length; i++)
        {
            Element service = this.desc_doc.createElement(GSXML.SERVICE_ELEM);
            service.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
            service.setAttribute(GSXML.NAME_ATT, services[i]);
            this.short_service_info.appendChild(service);
        }

        return true;
    }

    protected Element getServiceDescription(Document doc, String service_id, String lang, String subset)
    {
        for (int i = 0; i < services.length; i++)
        {
            if (service_id.equals(services[i]))
            {
                Element service_elem = doc.createElement(GSXML.SERVICE_ELEM);
                service_elem.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_RETRIEVE);
                service_elem.setAttribute(GSXML.NAME_ATT, services[i]);
                return service_elem;
            }
        }

        return null;
    }
    
    protected Element processGetAllImagesInCollection(Element request)
    {
      Document result_doc = XMLConverter.newDOM();
        Element result = GSXML.createBasicResponse(result_doc, GET_ALL_IMAGES_IN_COLLECTION);

        if (request == null)
        {
            GSXML.addError(result, GET_ALL_IMAGES_IN_COLLECTION + ": Request is null", GSXML.ERROR_TYPE_SYNTAX);
            return result;
        }
        
        String lang = request.getAttribute(GSXML.LANG_ATT);
        String uid = request.getAttribute(GSXML.USER_ID_ATT);
        
        // Get the parameters of the request
        Element param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);

        if (param_list == null) {
            GSXML.addError(result, GET_ALL_IMAGES_IN_COLLECTION + ": No param list specified", GSXML.ERROR_TYPE_SYNTAX);
            return result;  // Return the empty result
        }

        HashMap<String, Serializable> params = GSXML.extractParams(param_list, false);
        
        String regex = (String)params.get("extregex");
        if(regex == null)
        {
            GSXML.addError(result, GET_ALL_IMAGES_IN_COLLECTION + ": No file name extensions specified", GSXML.ERROR_TYPE_SYNTAX);
            return result;
        }
        regex = ".*" + regex + ".*";
        
        String collection = (String)params.get("c");
        if(collection == null)
        {
            GSXML.addError(result, GET_ALL_IMAGES_IN_COLLECTION + ": No collection specified", GSXML.ERROR_TYPE_SYNTAX);
            return result;
        }
        
        File indexDir = new File(this.site_home + File.separator + "collect" + File.separator + collection + File.separator + "index" + File.separator + "assoc");
        ArrayList<String> images = new ArrayList<String>();
        getImagesRecursive(indexDir, regex, images);
        
        Element imageListElem = result_doc.createElement("imageList");
        result.appendChild(imageListElem);
        for(String i : images)
        {
            Element imageElem = result_doc.createElement("image");
            imageElem.appendChild(result_doc.createTextNode(i));
            imageListElem.appendChild(imageElem);
        }
        return result;
    }
    
    /********************
     * Helper functions *
     *******************/
    
    protected void getImagesRecursive(File current, String regex, ArrayList<String> images)
    {
        if(current.isDirectory())
        {
            File[] files = current.listFiles();
            for(File f : files)
            {
                getImagesRecursive(f, regex, images);
            }
        }
        else
        {
            String path = current.getAbsolutePath();
            String filename = path.substring(path.lastIndexOf(File.separator) + File.separator.length());

            if(filename.matches(regex))
            {
                images.add(path);
            }
            else
            {
        
            }
        }
    }
}