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/*
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* ClientViewHelper.java
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*
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* Created on June 25, 2007, 9:57 AM
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*
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* To change this template, choose Tools | Template Manager
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* and open the template in the editor.
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*/
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package edu.ucsb.nceas.metacat.clientview;
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import com.oreilly.servlet.multipart.FilePart;
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import com.oreilly.servlet.multipart.MultipartParser;
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import com.oreilly.servlet.multipart.ParamPart;
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import com.oreilly.servlet.multipart.Part;
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import edu.ucsb.nceas.metacat.MetaCatUtil;
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import edu.ucsb.nceas.metacat.client.MetacatClient;
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import edu.ucsb.nceas.metacat.client.MetacatFactory;
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import edu.ucsb.nceas.metacat.client.MetacatInaccessibleException;
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import edu.ucsb.nceas.utilities.XMLUtilities;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.Reader;
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import java.io.StringReader;
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import java.util.HashMap;
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import java.util.Properties;
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import java.util.TreeMap;
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import java.util.Vector;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import javax.xml.xpath.XPath;
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import javax.xml.xpath.XPathConstants;
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import javax.xml.xpath.XPathExpressionException;
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import javax.xml.xpath.XPathFactory;
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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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/**
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*
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* @author barteau
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*/
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public class ClientViewHelper {
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private XPath xpath = XPathFactory.newInstance().newXPath();
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private HttpSession clientSession;
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private ClientView clientViewBean = null;
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private MetacatClient metacatClient = null;
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private boolean loggedIn = false;
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private Document metadataDoc = null;
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private int sizeLimit;
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private String contactName = "";
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private static final String LDAP_TEMPLATE = "uid=%1$s,o=%2$s,dc=ecoinformatics,dc=org";
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/**
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* Creates a new instance of ClientViewHelper
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*/
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public ClientViewHelper(HttpServletRequest request) throws MetacatInaccessibleException {
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String metacatPath = "http://%1$s%2$s/metacat";
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String host, context, button;
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clientSession = request.getSession();
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host = request.getHeader("host");
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context = request.getContextPath();
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metacatPath = String.format(metacatPath, host, context);
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metacatClient = (MetacatClient) MetacatFactory.createMetacatConnection(metacatPath);
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sizeLimit = (new Integer(MetaCatUtil.getOption("datafilesizelimit"))).intValue();
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}
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public String clientRequest(HttpServletRequest request, HttpServletResponse response) {
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String result = null, action, message, serverResponse;
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String button, contentType, posted_ldapUserName;
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MultipartParser multipartParser;
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if (clientViewBean == null)
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clientViewBean = (ClientView) clientSession.getAttribute(ClientView.CLIENT_VIEW_BEAN);
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if (clientViewBean != null) {
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action = clientViewBean.getAction();
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contentType = request.getContentType();
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if (contentType != null && contentType.contains("multipart/form-data"))
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action = "Upload";
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try {
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if (action.equals("Login")) {
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posted_ldapUserName = String.format(LDAP_TEMPLATE, clientViewBean.getUsername(), clientViewBean.getOrganization());
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serverResponse = metacatClient.login(posted_ldapUserName, clientViewBean.getPassword());
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setLoggedIn(serverResponse);
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message = parseXml("message", serverResponse);
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contactName = parseXml("name", serverResponse);
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clientViewBean.setMessage(ClientView.LOGIN_MESSAGE, message);
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clientViewBean.setMessage(ClientView.UPLOAD_MESSAGE, "");
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if (isLoggedIn()) {
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clientViewBean.setSessionid(metacatClient.getSessionId());
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}
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} else if (action.equals("Logout")) {
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message = metacatClient.logout();
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setLoggedIn(message);
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message = parseXml("message", message);
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clientViewBean.setMessage(ClientView.LOGIN_MESSAGE, message);
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clientViewBean.setMessage(ClientView.UPLOAD_MESSAGE, "");
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if (!isLoggedIn()) {
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clientViewBean.setUsername("");
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clientViewBean.setPassword("");
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clientViewBean.setOrganization("");
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}
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} else if (action.equals("Delete")) {
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ClientFgdcHelper.clientDeleteRequest(clientViewBean, this);
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//*** Refresh the select list.
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message = handleDocIdSelect();
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clientViewBean.setMessage(ClientView.SELECT_MESSAGE, message);
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} else if (action.equals("Replace")) {
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message = "Not implemented, come back another day";
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clientViewBean.setMessage(ClientView.REPLACE_MESSAGE, message);
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} else if (action.equals("Upload")) {
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message = "";
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//*** Only process request if a file upload.
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if (isLoggedIn()) {
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//*** Init the MultipartParser.
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multipartParser = new MultipartParser(request, sizeLimit * 1024 * 1024);
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message = handlePackageUpload(clientViewBean, multipartParser);
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}
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clientViewBean.setMessage(ClientView.UPLOAD_MESSAGE, message);
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} else if (action.equals("Update")) {
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} else if (action.equals("Scope")) {
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message = handleDocIdSelect();
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clientViewBean.setMessage(ClientView.SELECT_MESSAGE, message);
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}
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//*** Now that the action has been processed, clear it.
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clientViewBean.setAction("");
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} catch (Exception ex) {
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message = ex.getMessage();
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clientViewBean.setMessage(ClientView.ERROR_MESSAGE, message);
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ex.printStackTrace();
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}
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} else {
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System.out.println("ClientViewHelper.clientRequest: ClientView bean is not instantiated.");
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}
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return(result);
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}
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/**
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* This is a convenience method to reduce the amount of code in a Metacat Client.
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* It handles creating/reusing (per session) an instance of a ClientViewHelper.
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* @param request Since this is intended to be used by an Http client, it is passed the
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* available "request" variable (the HttpServletRequest).
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* @throws edu.ucsb.nceas.metacat.client.MetacatInaccessibleException Received by MetacatFactory.
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* @return ClientViewHelper instance.
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*/
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public static ClientViewHelper clientViewHelperInstance(HttpServletRequest request) {
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ClientViewHelper result;
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result = (ClientViewHelper) request.getSession().getAttribute("ClientViewHelper");
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if (result == null) {
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try {
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result = new ClientViewHelper(request);
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request.getSession().setAttribute("ClientViewHelper", result);
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} catch (MetacatInaccessibleException ex) {
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ex.printStackTrace();
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}
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}
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return(result);
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}
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/**
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* A convenience method to be used by client code that requires
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* the user to be logged in. NOTE: setUser() must have been called first,
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* otherwise it will always return false.
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* @return boolean true if user has logged in for this session, false otherwise.
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*/
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public boolean isLoggedIn() {
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return(loggedIn);
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}
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/**
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* After calling "login(ldapUserName, pwd)", call this with the username
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* and servers response message. You can than use isLoggedIn() to determine if
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* the user is logged in, getLoginResponseElement(), etc. The user name will also
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* used by calls to doMetadataUpload() for Document Id creation (scope).
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* @param userName User name
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* @param serverResponse XML login response sent from Metacat.
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*/
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public void setLoggedIn(String serverResponse) {
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loggedIn = (serverResponse != null && serverResponse.contains("login"));
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}
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private String parseXml(String elementName, String xml) {
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String result = null;
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Document doc;
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try {
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doc = XMLUtilities.getXMLReaderAsDOMDocument(new StringReader(xml));
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result = (String) xpath.evaluate(elementName, doc.getDocumentElement(), XPathConstants.STRING);
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if (result != null)
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result = result.trim();
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} catch (IOException ex) {
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ex.printStackTrace();
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} catch (XPathExpressionException ex) {
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ex.printStackTrace();
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}
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return(result);
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}
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private String handleDocIdSelect() {
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String result = "";
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TreeMap allDocIds;
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if (!clientViewBean.getPathValue().equals("")) {
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allDocIds = getSelectQueryMap();
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result = ClientHtmlHelper.mapToHtmlSelect(allDocIds, "docId", "width: 240", 10);
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}
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return(result);
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}
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/**
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* Handles metadata file and data file uploads for inserting new
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* Metacat data packages. Note: if content type is not "multipart/form-data",
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* nothing will happen.
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* @param request HTTP request.
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* @return A 1-line status message for the user.
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*/
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private String handlePackageUpload(ClientView clientViewBean, MultipartParser multipartParser) throws Exception {
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String result = "", contentType, formatType;
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String lastDocId, nextDocId, metaDocId;
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Reader reader;
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int sizeLimit, idx;
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InputStream inputStream;
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HashMap paramsMap, dataDocIDs;
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StringBuilder fileName;
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boolean sendIt;
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//*** Get the First file, which should be the metadata file.
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paramsMap = new HashMap();
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fileName = new StringBuilder();
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inputStream = getNextInputStream(multipartParser, fileName, paramsMap);
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if (fileName.toString().toLowerCase().endsWith(".xml")) {
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//*** Keep it here for updating.
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setMetadataDoc(inputStream);
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//*** Get the Metadata File's DOC ID.
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lastDocId = getMetacatClient().getLastDocid(clientViewBean.getUsername());
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metaDocId = lastDocId = nextDocId(lastDocId, clientViewBean.getUsername());
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//*** Loop thru all of the data files, get fileName and inputStream.
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dataDocIDs = new HashMap();
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while ((inputStream = getNextInputStream(multipartParser, fileName, paramsMap)) != null) {
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//*** Get the data file's DOC ID.
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nextDocId = nextDocId(lastDocId, clientViewBean.getUsername());
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//*** Set the file format (just using file extension for now).
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idx = fileName.lastIndexOf(".");
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if (idx > 1)
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formatType = fileName.substring(idx+1).toUpperCase();
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else
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formatType = "";
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dataDocIDs.put(nextDocId, formatType);
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//*** Upload the data file to metacat.
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getMetacatClient().upload(nextDocId, fileName.toString(), inputStream, Integer.MAX_VALUE);
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lastDocId = nextDocId;
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fileName = new StringBuilder();
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}
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if (ClientFgdcHelper.isFGDC(getMetadataDoc())) {
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sendIt = ClientFgdcHelper.handlePackageUpload(metaDocId, dataDocIDs, contactName, getMetadataDoc());
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} else {
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//TODO add other types of metadata grammars here...
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System.out.println("ClientViewHelper.handlePackageUpload: not an FGDC file = " + fileName);
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result = fileName + " is not an FGDC file. Files not uploaded.";
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sendIt = false;
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}
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if (sendIt) {
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//*** Upload the metadata file to metacat.
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reader = XMLUtilities.getDOMTreeAsReader(metadataDoc.getDocumentElement(), false);
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getMetacatClient().insert(metaDocId, reader, null);
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result = "MetaCat Package Inserted: the Document Identifier is " + metaDocId;
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reader.close();
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//*** One last detail...grant the public read access.
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if (paramsMap.containsKey("publicAccess"))
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getMetacatClient().setAccess(metaDocId, "public", "read", "allow", "allowFirst");
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}
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} else {
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result = "The first file must be an XML Metadata file. Files not uploaded.";
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}
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if (inputStream != null)
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inputStream.close();
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return(result);
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}
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private InputStream getNextInputStream(MultipartParser multipartParser, StringBuilder fileName, HashMap paramsMap)
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throws IOException {
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InputStream result = null;
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Part part;
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String parmName = null, value = null, fnam;
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while ((part = multipartParser.readNextPart()) != null) {
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if (part.isParam()) {
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parmName = part.getName();
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value = ((ParamPart) part).getStringValue();
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paramsMap.put(parmName, value);
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System.out.println("ClientViewHelper.getNextInputStream: parmName = " + parmName + " value = " + value);
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} else if (part.isFile()) {
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fnam = ((FilePart) part).getFileName();
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if (fnam != null && !fnam.equals("")) {
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//*** File name is passed back via StringBuilder fileName param.
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fileName.append(fnam);
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result = ((FilePart) part).getInputStream();
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System.out.println("ClientViewHelper.getNextInputStream: fileName = " + fileName + " inputStream = " + result.toString());
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break;
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}
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}
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}
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return(result);
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}
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/**
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* Queries Metacat for document listings, and returns the results in a TreeMap,
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* where the key is the Doc Id, and the value is the Create Date. If the document
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* contains the specified 'returnfield', an addtional entry will be created with
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* the value being a Vector of sub-DocId's. The key of this entry will be the
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* original DocId with some addtional text added.
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* Reads bean properties 'pathExpr' (String[]), 'pathValue' (String)
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* and 'returnfield' (String).
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* @return TreeMap
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*/
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public TreeMap getSelectQueryMap() {
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TreeMap result;
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Document doc;
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NodeList nodeLst, subNodeLst;
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Node node, subNode;
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String key, val, paramExpr, paramVal;
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String value, returnFld;
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String path;
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Vector optGroup;
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final String DOCID_EXPR = "./docid";
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final String DOCNAME_EXPR = "./createdate";
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final String PARAM_EXPR = "./param[@name='%1$s']";
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path = clientViewBean.getPathExpr();
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returnFld = clientViewBean.getReturnfield();
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value = clientViewBean.getPathValue();
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result = new TreeMap();
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paramExpr = String.format(PARAM_EXPR, returnFld);
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//*** Query the database ***
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doc = query(path, value, returnFld);
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//*** Build the TreeMap to return ***
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try {
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nodeLst = (NodeList) xpath.evaluate("/resultset/document", doc, XPathConstants.NODESET);
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for (int i = 0; i < nodeLst.getLength(); i++) {
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node = nodeLst.item(i);
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key = xpath.evaluate(DOCID_EXPR, node);
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val = xpath.evaluate(DOCNAME_EXPR, node);
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result.put(key, key + " (" + val + ")");
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//*** returnfield values ***
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subNodeLst = (NodeList) xpath.evaluate(paramExpr, node, XPathConstants.NODESET);
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if (subNodeLst.getLength() > 0) {
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optGroup = new Vector();
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for (int k = 0; k < subNodeLst.getLength(); k++) {
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subNode = subNodeLst.item(k);
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paramVal = xpath.evaluate("text()", subNode);
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optGroup.add(paramVal);
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}
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result.put(key + " Data Files", optGroup);
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}
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}
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} catch (XPathExpressionException ex) {
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ex.printStackTrace();
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}
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return(result);
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}
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/**
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* Query metacat for documents that 'CONTAINS' the value at the specified XPath
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* expression. Additionally, returns another non-standard field value.
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* Standard info contains: DocId, DocName, DocType, CreateDate, and UpdateDate.
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* @param pathExpr String contianing an XPath expression.
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* @param pathValue String containing a comparison value at the XPath expression.
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* @param returnFld String containing an XPath expression to a field which will be returned
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* in addition to the standard info.
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* @return DOM Document containing the results.
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*/
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public Document query(String pathExpr, String pathValue, String returnFld) {
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Document result = null;
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InputStream response;
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405
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BufferedReader buffy;
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406
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Properties prop;
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407
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408
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try {
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prop = new Properties();
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410
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prop.put("action", "query");
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prop.put("qformat", "xml");
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prop.put(pathExpr, pathValue);
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413
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if (returnFld != null) {
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414
|
prop.put("returnfield", returnFld);
|
415
|
}
|
416
|
|
417
|
response = metacatClient.sendData(prop, null, null, 0);
|
418
|
if (response != null) {
|
419
|
buffy = new BufferedReader(new InputStreamReader(response));
|
420
|
result = XMLUtilities.getXMLReaderAsDOMDocument(buffy);
|
421
|
}
|
422
|
} catch (IOException ex) {
|
423
|
ex.printStackTrace();
|
424
|
} catch (Exception ex) {
|
425
|
ex.printStackTrace();
|
426
|
}
|
427
|
return(result);
|
428
|
}
|
429
|
|
430
|
public void setMetadataDoc(Document doc) {
|
431
|
metadataDoc = doc;
|
432
|
}
|
433
|
|
434
|
public void setMetadataDoc(String docId) throws Exception {
|
435
|
Document doc = null;
|
436
|
BufferedReader buffy;
|
437
|
Properties prop;
|
438
|
InputStream response;
|
439
|
|
440
|
//*** MetaCatServlet Properties: action, qformat and docid. ***
|
441
|
prop = new Properties();
|
442
|
prop.put("action", "read");
|
443
|
prop.put("qformat", "xml");
|
444
|
prop.put("docid", docId);
|
445
|
response = metacatClient.sendData(prop, null, null, 0);
|
446
|
if (response != null) {
|
447
|
buffy = new BufferedReader(new InputStreamReader(response));
|
448
|
doc = XMLUtilities.getXMLReaderAsDOMDocument(buffy);
|
449
|
}
|
450
|
setMetadataDoc(doc);
|
451
|
}
|
452
|
|
453
|
public void setMetadataDoc(InputStream ioStream) throws IOException {
|
454
|
BufferedReader buffy;
|
455
|
|
456
|
if (ioStream != null) {
|
457
|
buffy = new BufferedReader(new InputStreamReader(ioStream));
|
458
|
metadataDoc = XMLUtilities.getXMLReaderAsDOMDocument(buffy);
|
459
|
}
|
460
|
}
|
461
|
|
462
|
public Document getMetadataDoc() {
|
463
|
return(metadataDoc);
|
464
|
}
|
465
|
|
466
|
public String nextVersion(String lastDocId, String xPathQuery) throws XPathExpressionException {
|
467
|
String result = null, tokens[], scope, ready2Split;
|
468
|
int vers, docNum;
|
469
|
final int LAST_TOKEN = 2;
|
470
|
final String TEMPLATE = "%1$s.%2$d.%3$d";
|
471
|
Node node;
|
472
|
|
473
|
//*** Parse the last Doc Id, and increment the version number.
|
474
|
if(lastDocId != null && lastDocId.contains(".")) {
|
475
|
ready2Split = lastDocId.replace('.','~'); //*** This is necessary for the split to work.
|
476
|
tokens = ready2Split.split("~");
|
477
|
if(tokens.length > LAST_TOKEN && !tokens[LAST_TOKEN].equals("")) {
|
478
|
scope = tokens[LAST_TOKEN - 2];
|
479
|
docNum = Integer.parseInt(tokens[LAST_TOKEN - 1]);
|
480
|
try {
|
481
|
vers = Integer.parseInt(tokens[LAST_TOKEN]);
|
482
|
result = String.format(TEMPLATE, scope, docNum, 1 + vers);
|
483
|
} catch (NumberFormatException ex) {
|
484
|
//*** In case the lastDocId has something other than a number.
|
485
|
result = String.format(TEMPLATE, scope, docNum, 1);
|
486
|
}
|
487
|
} else {
|
488
|
//*** In case the lastDocId ends with a '.'
|
489
|
result = lastDocId + "1";
|
490
|
}
|
491
|
} else {
|
492
|
//*** In case of missing doc Id.
|
493
|
result = null;
|
494
|
}
|
495
|
//*** Update the Doc Id in the metadata file.
|
496
|
if (getMetadataDoc() != null) {
|
497
|
node = (Node) xpath.evaluate(xPathQuery, getMetadataDoc().getDocumentElement(), XPathConstants.NODE);
|
498
|
node.setTextContent(result);
|
499
|
}
|
500
|
return(result);
|
501
|
}
|
502
|
|
503
|
private String nextDocId(String lastDocId, String scope) {
|
504
|
String result = null, tokens[];
|
505
|
int vers;
|
506
|
String template = scope.toLowerCase() + ".%1$d.%2$d";
|
507
|
|
508
|
if(lastDocId != null && lastDocId.contains(".")) {
|
509
|
lastDocId = lastDocId.replace('.','~'); //*** This is necessary for the split to work.
|
510
|
tokens = lastDocId.split("~");
|
511
|
if(tokens.length > 1 && !tokens[1].equals("")) {
|
512
|
try {
|
513
|
vers = Integer.parseInt(tokens[1]);
|
514
|
result = String.format(template, 1 + vers, 1);
|
515
|
} catch (NumberFormatException ex) {
|
516
|
//*** In case the lastDocId has something other than a number.
|
517
|
result = String.format(template, 1, 1);
|
518
|
}
|
519
|
} else {
|
520
|
//*** In case the lastDocId ends with a '.'
|
521
|
result = String.format(template, 1, 1);
|
522
|
}
|
523
|
} else {
|
524
|
//*** In case there isn't any doc Id's with the user name.
|
525
|
result = String.format(template, 1, 1);
|
526
|
}
|
527
|
return(result);
|
528
|
}
|
529
|
|
530
|
public MetacatClient getMetacatClient() {
|
531
|
return(metacatClient);
|
532
|
}
|
533
|
}
|