source: other-projects/gs3-webservices-java-client/trunk/src/GS3DemoClient/org/greenstone/gs3client/dlservices/GS3ServicesAPIA.java@ 21835

/**
 *#########################################################################
 * GS3ServicesAPIA.java - part of the demo-client for Greenstone 3, of the 
 * Greenstone digital library suite from the New Zealand Digital Library 
 * Project at the  * University of Waikato, New Zealand.
 * <BR><BR>
 * Copyright (C) 2008 New Zealand Digital Library Project
 * <BR><BR>
 * 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.
 * <BR><BR>
 * 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.
 *########################################################################
 */

package org.greenstone.gs3client.dlservices;

import javax.swing.JOptionPane;

import java.util.HashMap;
import java.util.Map;

import java.io.IOException;
import java.net.MalformedURLException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.rpc.ServiceException;
import org.xml.sax.SAXException;

import org.greenstone.gs3client.data.DocumentNodeData;

import org.apache.log4j.Logger; //Import log4j classes
import java.util.Properties;

/** 
 * GS3ServicesAPIA does two things:
 * - it implements DigitalLibraryServicesAPIA for enabling the Java-client 
 * to access Greenstone's repository of collections and documents. It 
 * makes this possible through use of Greenstone 3's web services. 
 * - it inherits from GS3WebServicesQBRAPI, which means it inherits all the
 * methods that deal with invoking the Greenstone 3 web services 
 * functionality (through use of Apache Axis' Service and Call objects). 
 * It therefore provides an equivalent method to each Greenstone 3 web 
 * service operation, even if some of these web service operations are 
 * never called by the Java-client and therefore not prescribed by the 
 * DigitalLibraryServicesAPIA interface.
 * @author ak19 
*/
public class GS3ServicesAPIA extends GS3WebServicesQBRAPI 
    implements DigitalLibraryServicesAPIA 
{
    /** The Logger for this class */
    static Logger LOG = Logger.getLogger(GS3ServicesAPIA.class);
    
    /** Storing language settings for requests and responses*/
    protected String language;
    
    /** Displays a dialog to get user input for the location of the Greenstone 3  
     * web services' WSDL file */
    public GS3ServicesAPIA() 
        throws ServiceException, MalformedURLException, 
            ParserConfigurationException, IOException, Exception 
    {
         this(showWsdlInputDialog());
    }
    
    /** GS3ServicesAPIA constructor, which, given the url to the wsdl file, 
     * finds either service and port or the service's endpoint of the GS3 Web 
     * Services and instantiates the associated Service and Call objects. 
     * @param wsdlURLName - location of the WSDL for Greenstone 3's 
     * web services */
    public GS3ServicesAPIA(String wsdlURLName) 
        throws ServiceException, MalformedURLException, 
            ParserConfigurationException, IOException, SAXException
    {   
        super(wsdlURLName);
        // Very important to initialise member language to some value, in
        // this case, it is set to "" (which Greenstone takes as English).
        this.language = ""; 
    }

    /** Static method that displays a dialog requesting the user to 
     * input the location of Greenstone 3 web services' WSDL file. 
     * @return a String representing the URL location of Greenstone 3 web 
     * services' WSDL file */
    public static String showWsdlInputDialog() 
        throws Exception 
    {
        String wsdlURL = "";
        Properties properties = new Properties();
        
        // set default values from any properties file 
        try {
            if(DigitalLibraryServicesAPIA.propertiesFile.exists()) { 
                properties.load(new java.io.FileInputStream(
                    DigitalLibraryServicesAPIA.propertiesFile));
            }
        } catch(Exception e) { 
            LOG.warn("Exception loading properties from file " 
                + DigitalLibraryServicesAPIA.propertiesFile 
                + ": " + e);
        } 
        
        // Show the dialog and get input for the wsdlURL property
        // It will display GS3WebServicesQBRAPI.defaultWsdlURL in the input 
        // field if it can not find a wsdlURL property in the propertiesFile
        wsdlURL = JOptionPane.showInputDialog(
            "Enter the URL of the wsdl file of GS3's QBRSOAPServer web services",
            properties.getProperty("wsdlURL", GS3WebServicesQBRAPI.defaultWsdlURL)
        ); 
        if(wsdlURL == null) { // cancel pressed
            throw new CancelException(
                "User cancelled out of connecting to GS3 Web Services");
        } else { // if ok clicked, update properties with the input value
            properties.setProperty("wsdlURL", wsdlURL);
        }
        
        // Store the user-entered URL for future use, so it is loaded next time
        try {
            java.io.FileOutputStream out = new java.io.FileOutputStream(
                    DigitalLibraryServicesAPIA.propertiesFile); 
            properties.store(out, "GS3ServicesAPIA");
            out.close();
        } catch(Exception e) { 
            LOG.warn("Exception writing properties to file " 
                    + DigitalLibraryServicesAPIA.propertiesFile 
                    + ": " + e);
        } 
        return wsdlURL;
    }
   
    //************DigitalLibraryServicesAPIA METHOD IMPLEMENTATIONS************//
    /** @return the name of this digital library for displaying in the client */
    public String getDisplayName() {
        return "Greenstone3";
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract. 
     * Sets the preferred language (code) for metadata and other content to be
     * returned on request messages. If the preferred language is not available,
     * the implementation may choose to send English back instead, or failing
     * that, send the data in any other available language. 
     * @param language has to be a language code as recognised by Greenstone3
     * (the language codes used by W3C probably). E.g. "en" for English. */
    public void setLanguage(String language) { this.language = language; }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * Gets the language that's set as the preferred language. 
     * @return the language code as recognised by Greenstone3 (which are the 
     * language codes used by W3C probably). E.g. "en" for English. */
    public String getLanguage() { return language; }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract. 
     * @return the overall directory path for associated files (not including
     * the document's nodeID/pid). This can be used to *formulate* the base url 
     * of JEditorPane's HTML documents. If the documents from any digital library 
     * do not contain relative paths, or otherwise deal with the resolution of
     * relative urls themselves, then return "" from here. */
    public String getAssocFileBaseURL() { return ""; }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @return the directory path to the associated files of the given document 
     * node.  For instance, the base url of a JEditorPane's HTML documents can be 
     * set to this. */
    public String getAssocFileBaseURL(DocumentNodeData docNode) {
        return "_httpdocimg_/"; // for now. 
        // TODO:
        /*DocumentNodeData root = docNode.getRoot();
        if(root != null)
            return root.getAssocFilePath();
        else return "";*/
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract
     * @return Greenstone3 XML describe response message originating from 
     * the Message Router, describing the Collections, ServiceRacks
     * and Services supported by the Message Router for all collections. */
    public String describe() {
        return this.describe(language, "");
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @param collection is the name of the collection to be described.  
     * @return Greenstone3 XML describe response message originating from a
     * collection, describing the collection (display items) as well as
     * listing any services supported specifically by the collection. 
    */
    public String describeCollection(String collection) {
        return this.describeCollection(collection, language, "");
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @param collection is the name of the collection to be described.
     * @param service is the name of the collection's service to be described.
     * @return Greenstone3 XML describe response message originating from a
     * collection's service, describing the service (display items). 
    */
    public String describeCollectionService(String collection, String service) {
        return this.describeCollectionService(collection, service, language, "");
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @param service is the name of the collection's service to be described. 
     * @return Greenstone3 XML describe response message originating from a
     * general (non-collection specific) service, describing the requested 
     * service (for example with GS3 display items). 
    */
    public String describeService(String service) {
        return this.describeService(service, language, "");
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @param collection is the name of the collection.
     * @param docIDs is an array of document identifiers of documents whose (text)
     * contents are requested.
     * @return a String representing Greenstone3 DocumentContentRetrieve XML 
     * containing the document contents of the documents indicated by docIDs 
    */
    public String retrieveDocumentContent(String collection, String[] docIDs)  {
        return this.retrieveDocumentContent(collection, language, docIDs);
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @param collection is the name of the collection. 
     * @param docID is the document identifier of the document whose (text)
     * content is requested.
     * @return a String representing Greenstone3 DocumentContentRetrieve XML 
     * containing the document contents of the document indicated by docID 
    */
    public String retrieveDocumentContent(String collection, String docID) {
        return this.retrieveDocumentContent(collection, language, 
                new String[]{ docID });
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @param collection is the name of the collection. 
     * @param docIDs is an array of document identifiers of documents whose  
     * metadata is requested. 
     * @return a String representing Greenstone3 DocumentMetadataRetrieve XML 
     * containing all the metadata of all the documents indicated by docIDs 
    */
    public String retrieveDocumentMetadata(String collection, String[] docIDs) {
        return this.retrieveAllDocumentMetadata(collection, language, docIDs);
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @param collection is the name of the collection. 
     * @param docID is the document identifier of the document whose metadata is 
     * requested.
     * @return a String representing Greenstone3 DocumentMetadataRetrieve XML 
     * containing all the metadata of the document denoted by docID 
    */
    public String retrieveDocumentMetadata(String collection, String docID) {
        return this.retrieveAllDocumentMetadata(collection, language, 
                new String[] { docID });
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @param collection is the name of the collection. 
     * @param docIDs is an array of document identifiers of documents whose titles 
     * are requested 
     * @return a String representing Greenstone3 DocumentMetadataRetrieve XML 
     * containing only the title metadata of the documents denoted by docIDs 
    */
    public String retrieveTitleMetadata(String collection, String[] docIDs) {
        final String[] titleMetaName = {"Title"};
        return this.retrieveDocumentMetadata(collection, language, docIDs, 
                titleMetaName);
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @return a String representing Greenstone3 DocumentMetadataRetrieve XML 
     * containing only the title metadata of the document denoted by docID 
     * @param collection is the name of the collection 
     * @param docID is the document identifier of the document whose titles is 
     * requested */
    public String retrieveTitleMetadata(String collection, String docID) {
        final String[] titleMetaName = {"Title"};
        return this.retrieveDocumentMetadata(collection, language, 
                new String[] { docID }, titleMetaName);
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @return a String representing Greenstone3 DocumentMetadataRetrieve XML
     * containing the document structure of the documents indicated by docIDs: 
     * this means all their descendants 
     * @param collection is the name of the collection 
     * @param docIDs is an array of document identifiers of documents whose
     * hierarchical structures are requested */
    public String retrieveDocumentStructure(String collection, String[] docIDs) {
        return this.retrieveEntireDocumentStructure(collection, language, docIDs);
    }
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @return a String representing Greenstone3 DocumentMetadataRetrieve XML 
     * containing the document structure of the document indicated by docID: 
     * this means all its descendants 
     * @param collection is the name of the collection 
     * @param docID is the document identifier of the document whose hierarchical
     * structure is requested*/
    public String retrieveDocumentStructure(String collection, String docID) {
        return this.retrieveEntireDocumentStructure(collection, language, 
                new String[] { docID });
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @return a String representing Greenstone3 DocumentMetadataRetrieve XML 
     * containing a view of the document structure of the documents denoted by 
     * docs where only the requested documents and their direct children are  
     * returned. 
     * @param collection is the name of the collection 
     * @param docIDs is an array of document identifiers of documents whose
     * hierarchical structures are requested */
    public String retrieveDocumentChildren(String collection, String[] docIDs) {
        return this.retrieveDocumentStructure(collection, collection, docIDs, 
                new String[] { "children" }, null);
    } 
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @return a String representing Greenstone3 DocumentMetadataRetrieve XML 
     * containing a view of the document structure of the document denoted by 
     * docID where only the document and its direct children are returned. 
     * @param collection is the name of the collection 
     * @param docID is the document identifier of the document whose hierarchical
     * structure is requested */
    public String retrieveDocumentChildren(String collection, String docID) {
        return this.retrieveDocumentStructure(collection, collection, 
                new String[] { docID }, new String[] { "children" }, null);
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @return a String representing Greenstone3 ClassifierBrowse XML 
     * giving the entire *structure* of the classification denoted by 
     * classifierID (including the structures of document descendants of 
     * the classifier). 
     * @param classifierIDs - each ID is of the form CL# where the number (#)
     * marks out structured sections like CL1.1.3 or CL2 
     * @param collection is the name of the collection 
     * @param service is the name of the browse service (=ClassifierBrowse usually)
    */
    public String retrieveBrowseStructure(
            String collection, String service, String[] classifierIDs) 
    {
        return this.browseDescendants(collection, service, 
                language, classifierIDs );
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @return a String representing Greenstone3 
     * ClassifierBrowseMetadataRetrieve XML giving all the metadata for
     * all the subclassifiers denoted by nodeIDs. 
     * @param nodeIDs is of the form CL#.# where the number (#) marks
     * out structured sections like CL2.1.3. NodeIDs are generally subsections
     * of top-level classifierNodes (CL#, e.g. CL3). 
     * @param collection is the name of the collection 
     * @param service is the name of the Browse's MetadataRetrieve service 
     * (usually the browse service is ClassifierBrowse, in which case it always
     * has a retrieve service called ClassifierBrowseMetadataRetrieve) */
    public String retrieveBrowseMetadata(
            String collection, String service, String[] nodeIDs) 
    {
        return this.retrieveAllBrowseMetadata(collection, service, 
                language, nodeIDs);
    }
    
    /** Part of the GS3 Java-Client's DigitalLibraryServicesAPIA interface 
     * contract.
     * @return a String representing Greenstone3 XML for a query process
     * response returning the results for the query denoted by parameter
     * nameValParamsMap.
     * @param nameValParamsMap is a Map of name and value pairs for all the
     * query field data values. The names match the field names that
     * describeCollectionService() would have returned for the query service. 
     * @param collection is the name of the collection 
     * @param service is the name of the query service
    */
    public String query(String collection, String service, Map nameValParamsMap) 
    {
        return this.query(collection, service, language, nameValParamsMap);
    }
        
    /*public static void main(String args[]) {
        try{
            GS3ServicesAPIA ws = new GS3ServicesAPIA();
            
            // (1) trying 4 describe methods
            System.out.println(ws.describe("", ""));
            System.out.println(ws.describeCollectionOrServiceRack("gs2mgppdemo", "", ""));
            System.out.println(ws.describeCollectionService("gs2mgppdemo", "AdvancedFieldQuery", "", ""));
            System.out.println(ws.describeService("AddItem", "", ""));
            
            
            // (2) try 3 query methods (simplerFieldQuery twice) + getFieldNameMappings()
            Map map = new HashMap();
            map.put("maxDocs", "100");
            map.put("level", "Sec");
            map.put("accent", "1");
            map.put("matchMode", "some");
            map.put("fqf", "ZZ,ZZ,ZZ,ZZ");
            map.put("case", "1");
            map.put("sortBy", "1");
            map.put("fqv", "snail,water,,");
            
            String response = ws.query("gs2mgppdemo", "FieldQuery", "", map);
            System.out.println("Regular query: " + response);
            
            System.out.println("Field mappings: " + ws.getFieldNameMappings());
            response = ws.simplerFieldNameQuery(
                    "gs2mgppdemo", "FieldQuery", "", map);
            System.out.println("response:\n" + response);
            
            // trying the same with special field names
            map.clear();

            map.put("maxDocs", "100");
            map.put("level", "Sec");
            map.put("accent", "on");
            map.put("matchMode", "some");
            map.put("fields", "all fields,all fields,all fields,all fields");
            map.put("case", "on");
            map.put("sortBy", "on");
            map.put("values", "snail,water,,");
            
            response = ws.simplerFieldNameQuery(
                    "gs2mgppdemo", "FieldQuery", "", map);
            System.out.println("response:\n" + response);
            
            // trying query - array version
            String[] names = {"maxDocs", "level", "accent", "matchMode", "fqf",
                    "case", "sortBy", "fqv"};
            String[] values = {"100", "Sec", "1", "some", "ZZ,ZZ,ZZ,ZZ",  
                    "1", "1", "snail,water,,"};
            System.out.println(ws.query("gs2mgppdemo", "FieldQuery", "", names, values));
            
            
            // (3) try 2 browse
            System.out.println("describe browse:\n" 
                    + ws.describeCollectionService("gs2mgppdemo", "ClassifierBrowse", "", ""));

            System.out.println("browse children of CL1-CL4:\n" +
                    ws.browse("gs2mgppdemo", "ClassifierBrowse", "", 
                    new String[]{"CL1", "CL2", "CL3", "CL4"}, new String[]{"children"}));
            
            System.out.println("browse descendants of CL2.3:\n" +
                    ws.browseDescendants("gs2mgppdemo", "ClassifierBrowse", "", 
                    new String[]{"CL2.3"}));
            
            
            // (4) try 2 DocStructure
            System.out.println("retrieve ancestors and children structure of HASH016193b2847874f3c956d22e.4:\n" +
                    ws.retrieveDocumentStructure("gs2mgppdemo", "", 
                            new String[]{"HASH016193b2847874f3c956d22e.4"}, 
                            new String[]{"ancestors", "children"}, new String[]{"numSiblings"}));
                            
            
            System.out.println("retrieve entire structure of HASH016193b2847874f3c956d22e.4.1:\n" +
                    ws.retrieveEntireDocumentStructure(
                            "gs2mgppdemo", "", new String[]{"HASH016193b2847874f3c956d22e.4.1"}));
            
            
            // (5) try the 1 DocumentContent retrieve
            System.out.println("retrieve content of HASH016193b2847874f3c956d22e.4:\n" +
                    ws.retrieveDocumentContent("gs2mgppdemo", "", 
                            new String[]{"HASH016193b2847874f3c956d22e.4", "HASH016193b2847874f3c956d22e.4.1", 
                            "HASH016193b2847874f3c956d22e.4.2"}));
            
            
            // (6) try 2 DocumentMeta
            System.out.println("retrieve title meta of HASH016193b2847874f3c956d22e.4 children:\n" +
                    ws.retrieveDocumentMetadata("gs2mgppdemo", "", 
                    new String[]{"HASH016193b2847874f3c956d22e.4.1", "HASH016193b2847874f3c956d22e.4.2",
                    "HASH016193b2847874f3c956d22e.4.3"}, new String[]{"Title"}));
            
            System.out.println("retrieve all meta of HASH016193b2847874f3c956d22e.4 children:\n" +
                    ws.retrieveAllDocumentMetadata("gs2mgppdemo", "", 
                            new String[]{"HASH016193b2847874f3c956d22e.4",
                            "HASH016193b2847874f3c956d22e.4.1", "HASH016193b2847874f3c956d22e.4.2",
                        "HASH016193b2847874f3c956d22e.4.3"}));
            
            // (7) try 2 BrowseMeta
            System.out.println("retrieve all browse meta of CL1, CL2, CL2.1, CL3:\n" +
                    ws.retrieveAllBrowseMetadata("gs2mgppdemo", "", "", 
                    new String[]{"CL1", "CL2",
                    "CL2.1", "CL3"}));
            
            System.out.println("retrieve Title, hastxt browse meta of CL1, CL2, CL2.1, CL3:\n" +
                    ws.retrieveBrowseMetadata("gs2mgppdemo", "", "", 
                    new String[]{"CL1", "CL2","CL2.1", "CL3"}, new String[]{"Title", "hastxt"}));
            
            // (8) try process:
            String requestXMLMessage = "<message>"
                + "<request lang='' to='gs2mgppdemo/ClassifierBrowseMetadataRetrieve' type='process' uid=''>"
                + "<paramList>" + "<param name='metadata' value='Title' />"
                + "<param name='metadata' value='hastxt' /></paramList>"
                + "<classifierNodeList><classifierNode nodeID='CL1' /><classifierNode nodeID='CL2' />"
                + "<classifierNode nodeID='CL2.1' /><classifierNode nodeID='CL3' /></classifierNodeList>"
                + "</request></message>";
            System.out.println(ws.process(requestXMLMessage));
            
            
            // (9) activate, deactivate and the 2 reconfigures
            System.out.println("activate:\n" + ws.activate("collection", "gs2mgppdemo"));
            System.out.println("deactivate:\n" + ws.deactivate("site", "site1"));
            System.out.println("configure MR:\n" + ws.reconfigure());
            System.out.println("configure:\n" + ws.reconfigure("collectionList"));
            
            // (10) 1 format 
            System.out.println("format:\n" + ws.format("gs2mgppdemo", "FieldQuery", ""));
            
            // (11) 2 processType: build/NewCollection, build/ImportCollection
            System.out.println("describe build/NewCollection:\n" 
                    + ws.describeService("build/NewCollection", "", ""));
                    
            Map params = new HashMap(10);
            params.put("creator", "me@home");
            params.put("collName", "the demo collection");
            params.put("collShortName", "demo");
            
            System.out.println("processType build/NewCollection:\n" 
                    + ws.processTypeService("build/NewCollection", "", params));
            
            params.clear(); 
            params.put("collection", "demo");
            System.out.println("processType build/ImportCollection:\n" 
                    + ws.processTypeService("build/ImportCollection", "", params));

            // (12) Test status(), if possible
            System.out.println("status:\n" + ws.status("build/NewCollection", "", "1"));
        
            
            // (13) One applet-type service:
            //Map params = new HashMap(10);
            params.clear();
            params.put("pc", "1");
            params.put("pptext", "health");
            params.put("pfe", "0");
            params.put("ple", "10");
            params.put("pfd", "0");
            params.put("pld", "10");
            params.put("pfl", "0");
            params.put("pll", "10");
            System.out.println("appletTypeService:\n"
                    + ws.appletTypeService("gs2mgppdemo", "PhindApplet", "query", params));
            // no PhindApplet service deployed in gs2mgppdemo anymore, so maybe that's
            // why it doesn't work. The request matches what's in the manual (p.50) though.
            
            
            // (14) One enrich service:
            params.clear();
            params.put("annotationType", "Date,Location");
            String[] nodeIDs = {"HASHac0a04dd14571c60d7fbfd"};
            String[] nodeContents = { "FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS\n"
                + "Rome 1986\nP-69\nISBN 92-5-102397-2\nFAO 1986"};
            System.out.println("enrich:\n"
                    + ws.enrich("GatePOSTag", "en", params, nodeIDs, nodeContents));
            // no GatePOSTag service deployed in gs2mgppdemo anymore, so maybe that's
            // why it doesn't work. The request matches what's in the manual (p.50) though.     
            
            // (16) try help
            System.out.println(ws.help());
            System.out.println(ws.help("describe"));
            
        }catch(Exception e) {
            System.out.println("Problem accessing service\n" + e.getMessage());
            e.printStackTrace();
        } 
    }*/
}