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/**
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* '$RCSfile$'
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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*
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.client;
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1786
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tao
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import java.io.BufferedReader;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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1784
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jones
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import java.io.PushbackReader;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.io.Reader;
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import java.net.URL;
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import java.util.Properties;
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import edu.ucsb.nceas.utilities.HttpMessage;
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import edu.ucsb.nceas.utilities.IOUtil;
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1780
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jones
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jones
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jones
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/**
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* This interface provides methods for initializing and logging in to a
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* Metacat server, and then querying, reading, transforming, inserting,
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* updating and deleting documents from that server.
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*/
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public class MetacatClient implements Metacat
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{
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/** The URL string for the metacat server */
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private String metacatUrl;
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/** The session identifier for the session */
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private String sessionId;
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1780
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jones
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/**
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* Constructor to create a new instance. Protected because instances
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* should only be created by the factory MetacatFactory.
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*/
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protected MetacatClient()
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{
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this.metacatUrl = null;
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this.sessionId = null;
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}
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/**
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* Method used to log in to a metacat server. Implementations will need
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* to cache a cookie value to make the session persistent. Each time a
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* call is made to one of the other methods (e.g., read), the cookie will
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* need to be passed back to the metacat server along with the request.
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*
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* @param username the username of the user, like an LDAP DN
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* @param password the password for that user for authentication
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* @return the response string from metacat in XML format
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* @throws MetacatAuthException when the username/password could
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* not be authenticated
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*/
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public String login(String username, String password)
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throws MetacatAuthException, MetacatInaccessibleException
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{
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Properties prop = new Properties();
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prop.put("action", "login");
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prop.put("qformat", "xml");
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prop.put("username", username);
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prop.put("password", password);
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String response = null;
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try {
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response = sendDataForString(prop);
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} catch (Exception e) {
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throw new MetacatInaccessibleException(e.getMessage());
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}
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if (response.indexOf("<login>") == -1) {
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setSessionId("");
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throw new MetacatAuthException(response);
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} else {
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int start = response.indexOf("<sessionId>") + 11;
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int end = response.indexOf("</sessionId>");
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if ((start != -1) && (end != -1)) {
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setSessionId(response.substring(start,end));
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}
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}
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return response;
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}
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/**
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* Method used to log out a metacat server. The Metacat server will end
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* the session when this call is invoked.
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tao
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*
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* @return the response string from metacat in XML format
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* @throws MetacatInaccessibleException when the metacat server can not be
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* reached or does not respond
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*/
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public String logout() throws MetacatInaccessibleException, MetacatException
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{
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Properties prop = new Properties();
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prop.put("action", "logout");
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prop.put("qformat", "xml");
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String response = null;
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try {
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response = sendDataForString(prop);
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} catch (Exception e) {
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throw new MetacatInaccessibleException(e.getMessage());
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}
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if (response.indexOf("<logout>") == -1) {
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throw new MetacatException(response);
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}
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setSessionId("");
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return response;
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}
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/**
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jones
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* Read an XML document from the metacat server session, accessed by docid,
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* and returned as a Reader.
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*
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* @param docid the identifier of the document to be read
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* @return a Reader for accessing the document
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* @throws InsufficientKarmaException when the user has insufficent rights
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* for the operation
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1784
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jones
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* @throws MetacatInaccessibleException when the metacat server can not be
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* reached or does not respond
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* @throws MetacatException when the metacat server generates another error
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1780
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jones
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*/
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jones
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public Reader read(String docid) throws InsufficientKarmaException,
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MetacatInaccessibleException, MetacatException
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1780
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{
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jones
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PushbackReader pbr = null;
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Properties prop = new Properties();
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prop.put("action", "read");
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prop.put("qformat", "xml");
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prop.put("docid", docid);
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InputStream response = null;
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try {
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response = sendData(prop);
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} catch (Exception e) {
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throw new MetacatInaccessibleException(e.getMessage());
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}
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pbr = new PushbackReader(new InputStreamReader(response), 512);
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try {
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char[] characters = new char[512];
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int len = pbr.read(characters, 0, 512);
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StringWriter sw = new StringWriter();
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sw.write(characters, 0, len);
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String message = sw.toString();
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sw.close();
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pbr.unread(characters, 0, len);
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if (message.indexOf("<error>") != -1) {
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if (message.indexOf("does not have permission") != -1) {
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throw new InsufficientKarmaException(message);
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} else {
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throw new MetacatException(message);
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}
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}
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} catch (IOException ioe) {
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180 |
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throw new MetacatException(
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"MetacatClient: Error converting Reader to String."
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+ ioe.getMessage());
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}
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return pbr;
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186 |
1780
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jones
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}
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187 |
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188 |
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/**
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189 |
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* Query the metacat document store with the given metacat-compatible
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190 |
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* query document, and return the result set as a Reader.
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191 |
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*
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192 |
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* @param xmlQuery a Reader for accessing the XML version of the query
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* @return a Reader for accessing the result set
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*/
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195 |
1786
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tao
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public Reader query(Reader xmlQuery) throws MetacatInaccessibleException,
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196 |
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IOException
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197 |
1780
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jones
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{
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198 |
1786
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tao
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Reader reader = null;
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199 |
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String query = null;
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200 |
1788
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jones
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try {
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201 |
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query = IOUtil.getAsString(xmlQuery, true);
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202 |
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} catch (IOException ioE) {
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203 |
1786
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tao
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throw ioE;
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204 |
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}
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205 |
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206 |
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//set up properties
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207 |
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Properties prop = new Properties();
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208 |
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prop.put("action", "squery");
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209 |
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prop.put("qformat", "xml");
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210 |
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prop.put("query", query);
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211 |
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212 |
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InputStream response = null;
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213 |
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try {
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214 |
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response = sendData(prop);
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215 |
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} catch (Exception e) {
|
216 |
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throw new MetacatInaccessibleException(e.getMessage());
|
217 |
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}
|
218 |
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reader = new InputStreamReader(response);
|
219 |
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return reader;
|
220 |
1780
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jones
|
}
|
221 |
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|
222 |
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/**
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223 |
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* Insert an XML document into the repository.
|
224 |
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*
|
225 |
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* @param docid the docid to insert the document
|
226 |
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* @param xmlDocument a Reader for accessing the XML document to be inserted
|
227 |
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* @param schema a Reader for accessing the DTD or XML Schema for
|
228 |
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* the document
|
229 |
1789
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jones
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* @return the metacat response message
|
230 |
1780
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jones
|
* @throws InsufficientKarmaException when the user has insufficent rights
|
231 |
|
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* for the operation
|
232 |
1789
|
jones
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* @throws MetacatInaccessibleException when the metacat server can not be
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233 |
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* reached or does not respond
|
234 |
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* @throws MetacatException when the metacat server generates another error
|
235 |
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* @throws IOException when there is an error reading the xml document
|
236 |
1780
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jones
|
*/
|
237 |
1789
|
jones
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public String insert(String docid, Reader xmlDocument, Reader schema)
|
238 |
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throws InsufficientKarmaException, MetacatException, IOException,
|
239 |
|
|
MetacatInaccessibleException
|
240 |
1780
|
jones
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{
|
241 |
1789
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jones
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Reader reader = null;
|
242 |
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String doctext = null;
|
243 |
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String schematext = null;
|
244 |
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try {
|
245 |
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doctext = IOUtil.getAsString(xmlDocument, true);
|
246 |
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if (schema != null) {
|
247 |
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schematext = IOUtil.getAsString(schema, true);
|
248 |
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}
|
249 |
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} catch (IOException ioE) {
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250 |
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throw ioE;
|
251 |
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}
|
252 |
|
|
|
253 |
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//set up properties
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254 |
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Properties prop = new Properties();
|
255 |
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prop.put("action", "insert");
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256 |
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prop.put("docid", docid);
|
257 |
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prop.put("doctext", doctext);
|
258 |
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if (schematext != null) {
|
259 |
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prop.put("dtdtext", schematext);
|
260 |
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}
|
261 |
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|
|
262 |
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String response = null;
|
263 |
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try {
|
264 |
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response = sendDataForString(prop);
|
265 |
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} catch (Exception e) {
|
266 |
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throw new MetacatInaccessibleException(e.getMessage());
|
267 |
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}
|
268 |
|
|
|
269 |
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// Check for an error condition
|
270 |
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|
if (response.indexOf("<error>") != -1) {
|
271 |
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if (response.indexOf("does not have permission") != -1) {
|
272 |
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throw new InsufficientKarmaException(response);
|
273 |
|
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} else {
|
274 |
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throw new MetacatException(response);
|
275 |
|
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}
|
276 |
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}
|
277 |
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|
278 |
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return response;
|
279 |
1780
|
jones
|
}
|
280 |
|
|
|
281 |
|
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/**
|
282 |
|
|
* Update an XML document in the repository.
|
283 |
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*
|
284 |
|
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* @param docid the docid to update
|
285 |
|
|
* @param xmlDocument a Reader for accessing the XML text to be updated
|
286 |
|
|
* @param schema a Reader for accessing the DTD or XML Schema for
|
287 |
|
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* the document
|
288 |
1795
|
jones
|
* @return the metacat response message
|
289 |
1780
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jones
|
* @throws InsufficientKarmaException when the user has insufficent rights
|
290 |
|
|
* for the operation
|
291 |
1795
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jones
|
* @throws MetacatInaccessibleException when the metacat server can not be
|
292 |
|
|
* reached or does not respond
|
293 |
|
|
* @throws MetacatException when the metacat server generates another error
|
294 |
|
|
* @throws IOException when there is an error reading the xml document
|
295 |
1780
|
jones
|
*/
|
296 |
1795
|
jones
|
public String update(String docid, Reader xmlDocument, Reader schema)
|
297 |
|
|
throws InsufficientKarmaException, MetacatException, IOException,
|
298 |
|
|
MetacatInaccessibleException
|
299 |
1780
|
jones
|
{
|
300 |
1795
|
jones
|
Reader reader = null;
|
301 |
|
|
String doctext = null;
|
302 |
|
|
String schematext = null;
|
303 |
|
|
try {
|
304 |
|
|
doctext = IOUtil.getAsString(xmlDocument, true);
|
305 |
|
|
if (schema != null) {
|
306 |
|
|
schematext = IOUtil.getAsString(schema, true);
|
307 |
|
|
}
|
308 |
|
|
} catch (IOException ioE) {
|
309 |
|
|
throw ioE;
|
310 |
|
|
}
|
311 |
|
|
|
312 |
|
|
//set up properties
|
313 |
|
|
Properties prop = new Properties();
|
314 |
|
|
prop.put("action", "update");
|
315 |
|
|
prop.put("docid", docid);
|
316 |
|
|
prop.put("doctext", doctext);
|
317 |
|
|
if (schematext != null) {
|
318 |
|
|
prop.put("dtdtext", schematext);
|
319 |
|
|
}
|
320 |
|
|
|
321 |
|
|
String response = null;
|
322 |
|
|
try {
|
323 |
|
|
response = sendDataForString(prop);
|
324 |
|
|
} catch (Exception e) {
|
325 |
|
|
throw new MetacatInaccessibleException(e.getMessage());
|
326 |
|
|
}
|
327 |
|
|
|
328 |
|
|
// Check for an error condition
|
329 |
|
|
if (response.indexOf("<error>") != -1) {
|
330 |
|
|
if (response.indexOf("does not have permission") != -1) {
|
331 |
|
|
throw new InsufficientKarmaException(response);
|
332 |
|
|
} else {
|
333 |
|
|
throw new MetacatException(response);
|
334 |
|
|
}
|
335 |
|
|
}
|
336 |
|
|
|
337 |
|
|
return response;
|
338 |
1780
|
jones
|
}
|
339 |
|
|
|
340 |
|
|
/**
|
341 |
|
|
* Delete an XML document in the repository.
|
342 |
|
|
*
|
343 |
|
|
* @param docid the docid to delete
|
344 |
1795
|
jones
|
* @return the metacat response message
|
345 |
1780
|
jones
|
* @throws InsufficientKarmaException when the user has insufficent rights
|
346 |
|
|
* for the operation
|
347 |
1795
|
jones
|
* @throws MetacatInaccessibleException when the metacat server can not be
|
348 |
|
|
* reached or does not respond
|
349 |
|
|
* @throws MetacatException when the metacat server generates another error
|
350 |
1780
|
jones
|
*/
|
351 |
1795
|
jones
|
public String delete(String docid)
|
352 |
|
|
throws InsufficientKarmaException, MetacatException,
|
353 |
|
|
MetacatInaccessibleException
|
354 |
1780
|
jones
|
{
|
355 |
1795
|
jones
|
//set up properties
|
356 |
|
|
Properties prop = new Properties();
|
357 |
|
|
prop.put("action", "delete");
|
358 |
|
|
prop.put("docid", docid);
|
359 |
|
|
|
360 |
|
|
String response = null;
|
361 |
|
|
try {
|
362 |
|
|
response = sendDataForString(prop);
|
363 |
|
|
} catch (Exception e) {
|
364 |
|
|
throw new MetacatInaccessibleException(e.getMessage());
|
365 |
|
|
}
|
366 |
|
|
|
367 |
|
|
// Check for an error condition
|
368 |
|
|
if (response.indexOf("<error>") != -1) {
|
369 |
|
|
if (response.indexOf("does not have permission") != -1) {
|
370 |
|
|
throw new InsufficientKarmaException(response);
|
371 |
|
|
} else {
|
372 |
|
|
throw new MetacatException(response);
|
373 |
|
|
}
|
374 |
|
|
}
|
375 |
|
|
|
376 |
|
|
return response;
|
377 |
1780
|
jones
|
}
|
378 |
|
|
|
379 |
|
|
/**
|
380 |
|
|
* When the MetacatFactory creates an instance it needs to set the
|
381 |
|
|
* MetacatUrl to which connections should be made.
|
382 |
|
|
*
|
383 |
|
|
* @param metacatUrl the URL for the metacat server
|
384 |
|
|
*/
|
385 |
|
|
public void setMetacatUrl(String metacatUrl)
|
386 |
|
|
{
|
387 |
1783
|
jones
|
this.metacatUrl = metacatUrl;
|
388 |
1780
|
jones
|
}
|
389 |
|
|
|
390 |
1822
|
jones
|
/**
|
391 |
|
|
* Get the session identifier for this session. This is only valid if
|
392 |
|
|
* the login methods has been called successfully for this Metacat object
|
393 |
|
|
* beforehand.
|
394 |
|
|
*
|
395 |
|
|
* @returns the sessionId as a String, or null if the session is invalid
|
396 |
|
|
*/
|
397 |
|
|
public String getSessionId()
|
398 |
|
|
{
|
399 |
|
|
return this.sessionId;
|
400 |
|
|
}
|
401 |
|
|
|
402 |
1826
|
jones
|
/**
|
403 |
|
|
* Set the session identifier for this session. This identifier was
|
404 |
|
|
* previously established with a call to login. To continue to use the
|
405 |
|
|
* same session, set the session id before making a call to one of the
|
406 |
|
|
* metacat access methods (e.g., read, query, insert, etc.).
|
407 |
|
|
*
|
408 |
|
|
* @param String the sessionId from a previously established session
|
409 |
|
|
*/
|
410 |
|
|
public void setSessionId(String sessionId)
|
411 |
|
|
{
|
412 |
|
|
this.sessionId = sessionId;
|
413 |
|
|
}
|
414 |
|
|
|
415 |
1780
|
jones
|
/************************************************************************
|
416 |
|
|
* PRIVATE METHODS
|
417 |
|
|
************************************************************************/
|
418 |
|
|
|
419 |
1783
|
jones
|
/**
|
420 |
|
|
* Send a request to metacat.
|
421 |
|
|
*
|
422 |
|
|
* @param prop the properties to be URL encoded and sent
|
423 |
|
|
*/
|
424 |
1780
|
jones
|
synchronized private InputStream sendDataOnce(Properties prop)
|
425 |
|
|
throws Exception
|
426 |
|
|
{
|
427 |
|
|
InputStream returnStream = null;
|
428 |
|
|
URL url = new URL(metacatUrl);
|
429 |
|
|
HttpMessage msg = new HttpMessage(url);
|
430 |
1828
|
jones
|
msg.setCookie("JSESSIONID="+this.sessionId);
|
431 |
1780
|
jones
|
returnStream = msg.sendPostData(prop);
|
432 |
|
|
return returnStream;
|
433 |
|
|
}
|
434 |
|
|
|
435 |
|
|
/**
|
436 |
|
|
* Send a request to Metacat
|
437 |
|
|
*
|
438 |
|
|
* @param prop the properties to be sent to Metacat
|
439 |
|
|
* @return InputStream as returned by Metacat
|
440 |
|
|
*/
|
441 |
|
|
synchronized private InputStream sendData(Properties prop) throws Exception
|
442 |
|
|
{
|
443 |
|
|
InputStream returnStream = null;
|
444 |
|
|
|
445 |
|
|
/*
|
446 |
|
|
Note: The reason that there are three try statements all executing
|
447 |
|
|
the same code is that there is a problem with the initial connection
|
448 |
|
|
using the HTTPClient protocol handler. These try statements make
|
449 |
|
|
sure that a connection is made because it gives each connection a
|
450 |
|
|
2nd and 3rd chance to work before throwing an error.
|
451 |
|
|
THIS IS A TOTAL HACK. THIS NEEDS TO BE LOOKED INTO AFTER THE BETA1
|
452 |
|
|
RELEASE OF MORPHO!!! cwb (7/24/01)
|
453 |
|
|
*/
|
454 |
|
|
try {
|
455 |
|
|
return sendDataOnce(prop);
|
456 |
|
|
} catch (Exception e) {
|
457 |
|
|
try {
|
458 |
|
|
return sendDataOnce(prop);
|
459 |
|
|
} catch (Exception e2) {
|
460 |
|
|
try {
|
461 |
|
|
return sendDataOnce(prop);
|
462 |
|
|
} catch (Exception e3) {
|
463 |
|
|
System.err.println(
|
464 |
|
|
"Failed to send data to metacat 3 times.");
|
465 |
|
|
throw e3;
|
466 |
|
|
}
|
467 |
|
|
}
|
468 |
|
|
}
|
469 |
|
|
}
|
470 |
1783
|
jones
|
|
471 |
|
|
/**
|
472 |
|
|
* Send a request to Metacat
|
473 |
|
|
*
|
474 |
|
|
* @param prop the properties to be sent to Metacat
|
475 |
|
|
* @return a string as returned by Metacat
|
476 |
|
|
*/
|
477 |
|
|
synchronized private String sendDataForString(Properties prop)
|
478 |
|
|
throws Exception
|
479 |
|
|
{
|
480 |
|
|
String response = null;
|
481 |
|
|
|
482 |
|
|
try {
|
483 |
|
|
InputStreamReader returnStream =
|
484 |
|
|
new InputStreamReader(sendData(prop));
|
485 |
|
|
StringWriter sw = new StringWriter();
|
486 |
|
|
int len;
|
487 |
|
|
char[] characters = new char[512];
|
488 |
|
|
while ((len = returnStream.read(characters, 0, 512)) != -1) {
|
489 |
|
|
sw.write(characters, 0, len);
|
490 |
|
|
}
|
491 |
|
|
returnStream.close();
|
492 |
|
|
response = sw.toString();
|
493 |
|
|
sw.close();
|
494 |
|
|
} catch (Exception e) {
|
495 |
|
|
throw e;
|
496 |
|
|
}
|
497 |
|
|
return response;
|
498 |
|
|
}
|
499 |
1780
|
jones
|
}
|