edu.ucsb.nceas.metacat.lsid.LSIDDataLookup.java Source code

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Here is the source code for edu.ucsb.nceas.metacat.lsid.LSIDDataLookup.java

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/**
 *  '$RCSfile$'
 *  Copyright: 2000-2005 Regents of the University of California and the
 *             National Center for Ecological Analysis and Synthesis
 *
 *   '$Author: harris $'
 *     '$Date: 2006-01-13 05:50:36 +1000 (Fri, 13 Jan 2006) $'
 * '$Revision: 2891 $'
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.ucsb.nceas.metacat.lsid;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ResourceBundle;
import java.util.StringTokenizer;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.ibm.lsid.LSID;
import com.ibm.lsid.server.LSIDServerException;

public class LSIDDataLookup {
    public static final int UNKNOWN = 1;
    public static final int ABSTRACT = 2;
    public static final int CONCRETE = 4;

    private static Log logger = LogFactory.getLog("edu.ucsb.nceas.metacat.lsid");

    public LSIDDataLookup() throws LSIDServerException {
        logger.info("Creating LSIDDataLookup (Metacat).");
    }

    public String getDocType(LSID lsid) {
        // example
        //http://metacat.nceas.ucsb.edu/knb/metacat?action=getrevisionanddoctype&docid=knb-lter-gce.109.6
        // returns rev;doctype

        String _docType = null;
        String ns = lsid.getNamespace();
        String id = lsid.getObject();
        String ver = lsid.getRevision();
        InputStream docStream = null;

        ResourceBundle rb = ResourceBundle.getBundle("metacat-lsid");
        String theServer = rb.getString("metacatserver");
        logger.debug("the server is " + theServer);

        String url = theServer + "?action=getrevisionanddoctype&docid=";
        url = url + ns + "." + id + "." + ver;
        try {
            URL theDoc = new URL(url);
            docStream = theDoc.openStream();

            StringTokenizer _st = new StringTokenizer(LSIDAuthorityMetaData.getStringFromInputStream(docStream),
                    ";");
            _st.nextToken();
            _docType = _st.nextToken();
            docStream.close();
        } catch (MalformedURLException mue) {
            logger.error("MalformedURLException in LSIDDataLookup: " + mue);
            mue.printStackTrace();
        } catch (IOException ioe) {
            logger.error("IOException in LSIDDataLookup: " + ioe);
            ioe.printStackTrace();
        }
        return _docType;
    }

    public int lsidType(LSID lsid) throws LSIDServerException {

        int result = CONCRETE;
        return result;
    }

    public InputStream lsidData(LSID lsid) throws LSIDServerException {
        String ns = lsid.getNamespace();
        String id = lsid.getObject();
        String ver = lsid.getRevision();
        InputStream docStream = null;

        // example metacat query
        // http://metacat.nceas.ucsb.edu/knb/metacat?action=read&qformat=xml&docid=knb-lter-gce.109.6
        //

        ResourceBundle rb = ResourceBundle.getBundle("metacat-lsid");
        String theServer = rb.getString("metacatserver");
        logger.debug("the server is " + theServer);

        String url = theServer + "?action=read&qformat=xml&docid=";
        url = url + ns + "." + id + "." + ver;
        try {
            URL theDoc = new URL(url);
            docStream = theDoc.openStream();
        } catch (MalformedURLException mue) {
            logger.error("MalformedURLException in LSIDDataLookup: " + mue);
            mue.printStackTrace();
        } catch (IOException ioe) {
            logger.error("IOException in LSIDDataLookup: " + ioe);
            ioe.printStackTrace();
        }
        return docStream;
    }
}