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package org.kepler.web.service;
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import com.google.gwt.user.client.rpc.*;
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import com.google.gwt.user.server.rpc.*;
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import org.kepler.web.client.*;
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import edu.ucsb.nceas.metacat.client.*;
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import org.w3c.dom.Document;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import org.apache.xpath.XPathAPI;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import org.xml.sax.InputSource;
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import java.io.*;
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import java.util.*;
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public class KeplerServiceServlet extends RemoteServiceServlet implements KeplerService
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{
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private String url = "http://library.kepler-project.org/kepler/metacat";
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/**
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* takes in a query string and a sessionid and returns a resultset
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*/
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public MetacatQueryResult[] query(String query, String sessionid)
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{
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try
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{ //query metacat
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MetacatClient client = (MetacatClient)MetacatFactory.createMetacatConnection(url);
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String queryDoc = createQueryDocument(query);
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Reader queryResultReader = client.query(new StringReader(queryDoc));
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//now we have the result document, parse it and return it as MQR[]
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InputSource is = new InputSource(queryResultReader);
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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DocumentBuilder builder = factory.newDocumentBuilder();
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Document doc = builder.parse(is);
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NodeList docs = XPathAPI.selectNodeList(doc, "/resultset/document");
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MetacatQueryResult[] mqr = new MetacatQueryResult[docs.getLength()];
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for(int i=0; i<docs.getLength(); i++)
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{
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Node docNode = docs.item(i);
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//parse each document result into an MQR
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mqr[i] = new MetacatQueryResult();
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String docid = XPathAPI.selectSingleNode(docNode, "docid").getFirstChild().getNodeValue();
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String name = XPathAPI.selectSingleNode(docNode, "param[@name='/entity/@name']").getFirstChild().getNodeValue();
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mqr[i].setDocid(docid);
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mqr[i].setName(name);
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mqr[i].setDescription("");
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}
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return mqr;
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}
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catch(Exception e)
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{
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return null;
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}
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}
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/**
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* takes in credentials and returns a sessionid
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*/
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public String login(String user, String pass)
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{
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try
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{
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MetacatClient client = (MetacatClient)MetacatFactory.createMetacatConnection(url);
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return client.login("uid=kepler,o=unaffiliated,dc=ecoinformatics,dc=org", "kepler");
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}
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catch(Exception e)
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{
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return "error: " + e.getMessage();
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}
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}
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public String logout()
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{
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return "logout";
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}
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/**
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* takes in a docid and a sessionid and returns a document
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*/
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public String read(String docid, String sessionid)
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{
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return "read";
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}
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private String createQueryDocument(String queryString)
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{
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String query = "<?xml version=\"1.0\"?>" +
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"<pathquery version=\"1.2\">" +
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"<querytitle>Untitled-Search-1</querytitle>" +
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"<returndoctype>entity</returndoctype>" +
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"<returndoctype>eml://ecoinformatics.org//eml-2.0.0</returndoctype>" +
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"<returndoctype>-//ecoinformatics.org//eml-dataset-2.0.0beta4//EN</returndoctype>" +
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"<returndoctype>-//ecoinformatics.org//eml-dataset-2.0.0beta6//EN</returndoctype>" +
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"<returndoctype>-//NCEAS//eml-dataset-2.0//EN</returndoctype>" +
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"<returndoctype>-//NCEAS//resource//EN</returndoctype>" +
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"<returnfield>/entity/@name</returnfield>" +
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"<querygroup operator=\"INTERSECT\">" +
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"<querygroup operator=\"UNION\">" +
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"<queryterm searchmode=\"contains\" casesensitive=\"false\">" +
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"<value>" + queryString + "</value>" +
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"</queryterm>" +
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"</querygroup>" +
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"</querygroup>" +
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"</pathquery>";
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return query;
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}
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}
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