BaseXCdiscLibraryXQuery.java

/*
* Copyright 2020 Jozef Aerts.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package org.basex.examples.api;

import java.io.*;

import org.basex.core.BaseXException;
import org.basex.core.Context;
import org.basex.core.cmd.XQuery;

public class BaseXCDISCLibraryXQuery {

    // For running the code, you will need the BaseX Java library, e.g.
    // "BaseX911.jar"
    private Context context;
    private String apiKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

    // CDISC Library XQuery
    private static String cdiscLibraryXQueryString = "(: apikey is  passed from external :)\r\n"
            + "declare variable $apikey external; \r\n" + "let $response := http:send-request(\r\n"
            + "<http:request method='get' href='https://api.library.cdisc.org/api/mdr/products'>\r\n"
            + "   	<http:header name=\"api-key\" value=\"{$apikey}\"/>  \r\n" + "</http:request>)\r\n"
            + "return $response";

    public BaseXCDISCLibraryXQuery() {
        context = new Context();
    }

    public void runXQuery() {
        XQuery xq = new XQuery(cdiscLibraryXQueryString);
        xq.bind("apikey", apiKey);
        try {
            String response = xq.execute(context);
            // as XQuery is for XML, the response will be an XML representation of the
            // returned JSON
            System.out.println("response = \n" + response);
        } catch (BaseXException e) {
            e.printStackTrace();
        }
    }

    public String readCdiscLibraryXQueryFormFile(String fileLocation) {
        String query = "";
        BufferedReader reader;
        try {
            reader = new BufferedReader(new FileReader(fileLocation));
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
            return null;
        }
        StringBuilder stringBuilder = new StringBuilder();
        String line = null;
        String ls = System.getProperty("line.separator");
        try {
            while ((line = reader.readLine()) != null) {
                stringBuilder.append(line);
                stringBuilder.append(ls);
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
        // return as a single string
        query = stringBuilder.toString();
        System.out.println("CDISC Library XQuery was read from file = " + fileLocation);
        return query;
    }

    public static void main(String[] args) {
        BaseXCDISCLibraryXQuery b = new BaseXCDISCLibraryXQuery();
        // uncomment end edit the following line for reading the XQuery from file
        // cdiscLibraryXQueryString =
        // b.readCdiscLibraryXQueryFormFile("C:\\baseX\\XQueries\\CDISC_Library_XQuery.xq");
        b.runXQuery();
    }

}