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/**
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* '$RCSfile$'
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* Copyright: 2000-2005 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.lsid;
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import java.io.BufferedReader;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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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.Hashtable;
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import java.util.ResourceBundle;
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2891
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import java.util.Enumeration;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.stream.StreamResult;
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import javax.xml.transform.stream.StreamSource;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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2737
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import com.ibm.lsid.LSID;
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import com.ibm.lsid.MalformedLSIDException;
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import com.ibm.lsid.MetadataResponse;
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import com.ibm.lsid.server.LSIDMetadataService;
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import com.ibm.lsid.server.LSIDRequestContext;
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import com.ibm.lsid.server.LSIDServerException;
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import com.ibm.lsid.server.LSIDServiceConfig;
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2737
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import edu.ucsb.nceas.metacat.client.Metacat;
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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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public class LSIDAuthorityMetaData implements LSIDMetadataService
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{
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private LSIDDataLookup lookup = null;
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private static Hashtable currentLSIDs = new Hashtable();
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private static Log logger = LogFactory
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.getLog("edu.ucsb.nceas.metacat.lsid");
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public void initService(LSIDServiceConfig cf) throws LSIDServerException
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{
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logger.info("Starting LSIDAuthorityMetadata.");
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lookup = new LSIDDataLookup();
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}
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private static final String RDF_NS = "http://www.w3.org/1999/02/22-rdf-syntax-ns#";
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private static final String DC_NS = "http://purl.org/dc/elements/1.1/";
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private static final String I3CP_NS = "urn:lsid:i3c.org:predicates:";
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private static final String I3C_CONTENT = "urn:lsid:i3c.org:types:content";
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private static final String DEFAULT_STYLESHEET = "default.xslt";
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public MetadataResponse getMetadata(LSIDRequestContext req, String[] formats)
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throws LSIDServerException
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{
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LSID lsid = req.getLsid();
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ByteArrayInputStream theMetadata = doMetadataRequest(lsid);
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return new MetadataResponse(theMetadata, null,
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MetadataResponse.RDF_FORMAT);
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}
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private ByteArrayInputStream doMetadataRequest(LSID lsid) throws
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LSIDServerException {
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logger.debug("getting metadata for lsid " + lsid.getLsid());
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2904
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try {
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LSIDDataLookup myLookup = new LSIDDataLookup();
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InputStream content = myLookup.lsidData(lsid);
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InputStream content2 = myLookup.lsidData(lsid);
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if (!isEML(content2)) {
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content = getEML(lsid);
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}
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content2.close();
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setCurrentLSID(lsid);
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// based on the doctype choose the appropriate stylesheet
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String styleSheetName = null;
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String _docType = myLookup.getDocType(lsid);
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try {
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ResourceBundle rb = ResourceBundle.getBundle("metacat-lsid");
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styleSheetName = rb.getString(_docType.replaceAll(":", ""));
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}
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catch (java.util.MissingResourceException mre) {
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logger.warn("there is no style corresponding to: '" + _docType +
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"' -- using default");
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styleSheetName = this.DEFAULT_STYLESHEET;
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mre.getMessage();
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}
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InputStream styleSheet = getClass()
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.getResourceAsStream(styleSheetName);
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TransformerFactory factory = TransformerFactory.newInstance();
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Transformer transformer = factory
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.newTransformer(new StreamSource(styleSheet));
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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transformer.transform(new StreamSource(content),
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new StreamResult(out));
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content.close();
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clearState();
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return new ByteArrayInputStream(out.toByteArray());
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}
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catch (Exception e) {
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throw new LSIDServerException(e, "Error transforming XML for: "
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+ lsid);
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}
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}
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public static String getStringFromInputStream(InputStream input)
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2819
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{
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StringBuffer result = new StringBuffer();
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BufferedReader in = new BufferedReader(new InputStreamReader(input));
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String line;
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try {
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while ((line = in.readLine()) != null) {
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result.append(line);
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}
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} catch (IOException e) {
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logger.error("IOexception " + e);
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}
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return result.toString();
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}
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2819
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/**
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* figure out is this inputstream is an eml document or not
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2891
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* TODO: need a better way to figure out if this is an eml document
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*/
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private boolean isEML(InputStream input)
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{
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2819
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if (input == null) { return false; }
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2819
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int loop = 0;
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boolean itIsEML = false;
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String line = "";
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try {
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BufferedReader in = new BufferedReader(new InputStreamReader(input));
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while ((loop < 20) && (line != null) && (!itIsEML)) {
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line = in.readLine();
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line = line.toLowerCase();
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if (line.indexOf("eml:eml") != -1) {
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itIsEML = true;
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}
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loop++;
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}
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} catch (IOException e) {
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logger.error("ioerror in LSIDAuthorityMetadata: " + e);
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}
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return itIsEML;
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}
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2737
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2819
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jones
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/**
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* this lsid points to a data object - get the metadata objects which refer
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* to this document
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*/
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private InputStream getEML(LSID theLSID)
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{
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2819
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InputStream response = null;
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2737
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2819
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jones
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// need to find things with this object in any of the elements
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// using the metacat api
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// get back dataset/docid and dataset/title
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2737
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2819
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// create the query
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String theQuery = getMetaCatQuery(theLSID);
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2737
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2819
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jones
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// get the metacat record
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Reader metaCatResponse = getMetaCatResponse(theQuery);
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2737
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2819
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jones
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// parse the metadata to get the applicable rdf information
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197 |
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response = parseMetaCatResponse(metaCatResponse, theLSID);
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198 |
2737
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2819
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jones
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return response;
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200 |
2737
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jones
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201 |
2819
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jones
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}
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202 |
2737
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203 |
2819
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jones
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/**
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204 |
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* given an LSID return a metacat query which will return docs mentioning
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205 |
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* this LSID
|
206 |
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*/
|
207 |
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private String getMetaCatQuery(LSID lsid)
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208 |
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{
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209 |
2818
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logger.debug("getting Metacat Query for: " + lsid.toString());
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210 |
2819
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jones
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String ns = lsid.getNamespace();
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211 |
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String id = lsid.getObject();
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212 |
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String ver = lsid.getRevision();
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String theName = ns + "." + id + "." + ver;
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214 |
2737
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jones
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215 |
2819
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jones
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String theQuery = null;
|
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theQuery = "<?xml version=\"1.0\"?>\n"
|
217 |
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+ "<pathquery version=\"1.2\">\n"
|
218 |
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+ " <querytitle>"
|
219 |
|
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+ theName
|
220 |
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+ " search</querytitle>\n"
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221 |
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+ " <returnfield>dataset/docid</returnfield>\n"
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222 |
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+ " <returnfield>dataset/title</returnfield>\n"
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223 |
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+ " <querygroup operator=\"UNION\">\n"
|
224 |
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+ " <queryterm searchmode=\"contains\" casesensitive=\"false\">\n"
|
225 |
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+ " <value>" + theName + "</value>\n"
|
226 |
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+ " <pathexpr>anyfield</pathexpr>\n"
|
227 |
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+ " </queryterm>\n" + " </querygroup>\n"
|
228 |
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+ "<pathquery>\n";
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229 |
2737
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jones
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230 |
2819
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jones
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return theQuery;
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231 |
2737
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jones
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232 |
2819
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jones
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}
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233 |
2737
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jones
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234 |
2819
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jones
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/**
|
235 |
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* given a query string, query MetaCat and return the response
|
236 |
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*/
|
237 |
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private Reader getMetaCatResponse(String query)
|
238 |
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{
|
239 |
2818
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jones
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logger.debug("Querying the metacat server.");
|
240 |
2819
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jones
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// get the metacat server from the configuration file
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241 |
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//
|
242 |
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ResourceBundle rb = ResourceBundle.getBundle("metacat-lsid");
|
243 |
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String url = rb.getString("metacatserver");
|
244 |
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Reader r = null;
|
245 |
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try {
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246 |
2737
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jones
|
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247 |
2819
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jones
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Metacat m = MetacatFactory.createMetacatConnection(url);
|
248 |
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r = m.query(new StringReader(query));
|
249 |
2737
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jones
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250 |
2819
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jones
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} catch (MetacatInaccessibleException mie) {
|
251 |
2818
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jones
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logger.error("Metacat Inaccessible:\n" + mie.getMessage());
|
252 |
2819
|
jones
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} catch (Exception e) {
|
253 |
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logger.error("General exception:\n" + e.getMessage());
|
254 |
|
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}
|
255 |
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return r;
|
256 |
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}
|
257 |
2737
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jones
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258 |
2819
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jones
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/**
|
259 |
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* Given a reader which is a metacat response, parse it and return the
|
260 |
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* appropriate rdf
|
261 |
|
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*/
|
262 |
|
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private InputStream parseMetaCatResponse(Reader reader, LSID theLSID)
|
263 |
|
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{
|
264 |
|
|
InputStream response = null;
|
265 |
2818
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jones
|
logger.debug("Parsing the metacat response.");
|
266 |
2819
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jones
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// if there's more than one document, then return rdf listing the
|
267 |
|
|
// documents
|
268 |
|
|
// otherwise get the document and return rdf based on it
|
269 |
2737
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jones
|
|
270 |
2819
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jones
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String contents = getStringFromReader(reader);
|
271 |
|
|
if (numberDocuments(contents) < 1) {
|
272 |
|
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response = noMetaDataResponse(theLSID);
|
273 |
|
|
} else if (numberDocuments(contents) > 1) {
|
274 |
|
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response = metaDataList(contents, theLSID);
|
275 |
|
|
} else {
|
276 |
|
|
response = getMetaData(contents, theLSID);
|
277 |
|
|
}
|
278 |
|
|
return response;
|
279 |
|
|
}
|
280 |
2737
|
jones
|
|
281 |
2819
|
jones
|
/**
|
282 |
|
|
* There's no metadata for this document
|
283 |
|
|
*/
|
284 |
|
|
private ByteArrayInputStream noMetaDataResponse(LSID theLSID)
|
285 |
|
|
{
|
286 |
|
|
ResourceBundle rb = ResourceBundle.getBundle("metacat-lsid");
|
287 |
|
|
String metadataLabels = rb.getString("metadatalabels");
|
288 |
2737
|
jones
|
|
289 |
2819
|
jones
|
String result = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
|
290 |
|
|
+ "<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\" \n"
|
291 |
|
|
+ " xmlns:dc=\"http://purl.org/dc/elements/1.1/\" \n"
|
292 |
|
|
+ " xmlns:pred=\"urn:lsid:i3c.org:predicates:\" xmlns=\"urn:lsid:"
|
293 |
|
|
+ metadataLabels
|
294 |
|
|
+ ":predicates:\"> \n"
|
295 |
|
|
+ "<rdf:Description rdf:about=\""
|
296 |
|
|
+ theLSID.getLsid()
|
297 |
|
|
+ "\"> \n"
|
298 |
|
|
+ " <pred:title xmlns:pred=\"http://purl.org/dc/elements/1.1/\">There is no metadata for this LSID.</pred:title>\n"
|
299 |
|
|
+ "</rdf:Description>\n" + "</rdf:RDF>\n";
|
300 |
2737
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jones
|
|
301 |
2819
|
jones
|
return new ByteArrayInputStream(result.getBytes());
|
302 |
|
|
}
|
303 |
2737
|
jones
|
|
304 |
2819
|
jones
|
/**
|
305 |
|
|
* There's more than one metdata document
|
306 |
|
|
*/
|
307 |
|
|
private ByteArrayInputStream metaDataList(String contents, LSID theLSID)
|
308 |
|
|
{
|
309 |
|
|
ResourceBundle rb = ResourceBundle.getBundle("metacat");
|
310 |
|
|
String metadataLabels = rb.getString("metadatalabels");
|
311 |
2737
|
jones
|
|
312 |
2819
|
jones
|
String result = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
|
313 |
|
|
+ "<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\" \n"
|
314 |
|
|
+ " xmlns:dc=\"http://purl.org/dc/elements/1.1/\" \n"
|
315 |
|
|
+ " xmlns:pred=\"urn:lsid:i3c.org:predicates:\" xmlns=\"urn:lsid:"
|
316 |
|
|
+ metadataLabels
|
317 |
|
|
+ ":predicates:\"> \n"
|
318 |
|
|
+ "<rdf:Description rdf:about=\""
|
319 |
|
|
+ theLSID.getLsid()
|
320 |
|
|
+ "\"> \n"
|
321 |
|
|
+ " <pred:title xmlns:pred=\"http://purl.org/dc/elements/1.1/\">There is more than one metadata document for this LSID - which confuses me right now. Try again soon and I'll be less confused.</pred:title>\n"
|
322 |
|
|
+ "</rdf:Description>\n" + "</rdf:RDF>\n";
|
323 |
2737
|
jones
|
|
324 |
2819
|
jones
|
return new ByteArrayInputStream(result.getBytes());
|
325 |
|
|
}
|
326 |
2737
|
jones
|
|
327 |
2819
|
jones
|
/**
|
328 |
|
|
* There's just one metadata document
|
329 |
|
|
*/
|
330 |
|
|
private ByteArrayInputStream getMetaData(String contents, LSID theLSID)
|
331 |
|
|
{
|
332 |
|
|
String paramString = "<param name=\"dataset/title\">";
|
333 |
|
|
ByteArrayInputStream result = null;
|
334 |
2737
|
jones
|
|
335 |
2819
|
jones
|
if (contents.indexOf(paramString) == -1) {
|
336 |
|
|
return noMetaDataResponse(theLSID);
|
337 |
|
|
} else {
|
338 |
|
|
String parts[] = contents.split(paramString);
|
339 |
|
|
String parts2[] = parts[1].split("</param>");
|
340 |
|
|
try {
|
341 |
|
|
LSID newLSID = new LSID(parts2[0]);
|
342 |
|
|
result = doMetadataRequest(newLSID);
|
343 |
2737
|
jones
|
|
344 |
2819
|
jones
|
} catch (MalformedLSIDException e) {
|
345 |
2818
|
jones
|
logger.error("problem generating LSID: " + e);
|
346 |
2819
|
jones
|
e.printStackTrace();
|
347 |
|
|
} catch (LSIDServerException e) {
|
348 |
2818
|
jones
|
logger.error("problem generating LSID: " + e);
|
349 |
2819
|
jones
|
e.printStackTrace();
|
350 |
|
|
}
|
351 |
|
|
}
|
352 |
|
|
return result;
|
353 |
|
|
}
|
354 |
2737
|
jones
|
|
355 |
2819
|
jones
|
/**
|
356 |
|
|
* Find out how many contents are in this metacat response I'm just using
|
357 |
|
|
* string stuff for this - sort of lame, but does the trick more cool would
|
358 |
|
|
* be to use xml stuff
|
359 |
|
|
*/
|
360 |
|
|
private int numberDocuments(String contents)
|
361 |
|
|
{
|
362 |
2737
|
jones
|
|
363 |
2819
|
jones
|
String[] docSplit = contents.split("<document>");
|
364 |
|
|
return (docSplit.length - 1);
|
365 |
|
|
}
|
366 |
2737
|
jones
|
|
367 |
2819
|
jones
|
/**
|
368 |
|
|
* Given a reader, return a string
|
369 |
|
|
*/
|
370 |
|
|
private String getStringFromReader(Reader reader)
|
371 |
|
|
{
|
372 |
|
|
StringBuffer response = new StringBuffer();
|
373 |
2737
|
jones
|
|
374 |
2819
|
jones
|
try {
|
375 |
|
|
BufferedReader bufReader = new BufferedReader(reader);
|
376 |
2737
|
jones
|
|
377 |
2819
|
jones
|
String line = null;
|
378 |
|
|
while ((line = bufReader.readLine()) != null) {
|
379 |
|
|
response.append(line);
|
380 |
|
|
}
|
381 |
|
|
bufReader.close();
|
382 |
2737
|
jones
|
|
383 |
2819
|
jones
|
} catch (IOException e) {
|
384 |
|
|
logger.error("error getting string from reader " + e);
|
385 |
|
|
}
|
386 |
|
|
return response.toString();
|
387 |
|
|
}
|
388 |
2737
|
jones
|
|
389 |
2819
|
jones
|
/**
|
390 |
|
|
* set the LSID for the current thread
|
391 |
|
|
*/
|
392 |
|
|
static void setCurrentLSID(LSID lsid)
|
393 |
|
|
{
|
394 |
|
|
currentLSIDs.put(Thread.currentThread(), lsid);
|
395 |
|
|
}
|
396 |
2737
|
jones
|
|
397 |
2819
|
jones
|
static void clearState()
|
398 |
|
|
{
|
399 |
|
|
currentLSIDs.remove(Thread.currentThread());
|
400 |
|
|
}
|
401 |
2737
|
jones
|
|
402 |
2819
|
jones
|
/**
|
403 |
|
|
* get the current LSID for the given thread, for use in XSLT so return a
|
404 |
|
|
* string
|
405 |
|
|
*/
|
406 |
|
|
public static String getLSID(
|
407 |
|
|
org.apache.xalan.extensions.XSLProcessorContext foo,
|
408 |
|
|
org.apache.xalan.templates.ElemExtensionCall bar)
|
409 |
|
|
throws MalformedLSIDException
|
410 |
|
|
{
|
411 |
|
|
return ((LSID) currentLSIDs.get(Thread.currentThread())).toString();
|
412 |
|
|
}
|
413 |
2737
|
jones
|
|
414 |
2819
|
jones
|
public static String getLSID() throws MalformedLSIDException
|
415 |
|
|
{
|
416 |
|
|
return ((LSID) currentLSIDs.get(Thread.currentThread())).toString();
|
417 |
|
|
}
|
418 |
2737
|
jones
|
}
|