/*
* Copyright (c) 2008 Los Alamos National Security, LLC.
*
* Los Alamos National Laboratory
* Research Library
* Digital Library Research & Prototyping Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
package gov.lanl.adore.djatoka.openurl;
import gov.lanl.adore.djatoka.io.FormatConstants;
import gov.lanl.adore.djatoka.util.IOUtils;
import gov.lanl.adore.djatoka.util.ImageRecord;
import gov.lanl.util.HttpDate;
import info.openurl.oom.ContextObject;
import info.openurl.oom.OpenURLRequest;
import info.openurl.oom.OpenURLRequestProcessor;
import info.openurl.oom.OpenURLResponse;
import info.openurl.oom.Service;
import info.openurl.oom.config.ClassConfig;
import info.openurl.oom.config.OpenURLConfig;
import info.openurl.oom.entities.ServiceType;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Properties;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
/**
* The OpenURLJP2Datastream OpenURL Service
*
* @author Ryan Chute
*/
public class OpenURLJP2Datastream implements Service, FormatConstants {
static Logger logger = Logger.getLogger(OpenURLJP2Datastream.class);
private static final String DEFAULT_IMPL_CLASS = SimpleListResolver.class.getCanonicalName();
private static final String PROPS_KEY_IMPL_CLASS = "OpenURLJP2KService.referentResolverImpl";
private static final String SVC_ID = "info:lanl-repo/svc/getDatastream";
private static String implClass = null;
private static Properties props = new Properties();
/**
* Construct an info:lanl-repo/svc/getXML web service class. Initializes
* Referent Resolver instance using OpenURLJP2KService.referentResolverImpl property.
*
* @param openURLConfig OOM Properties forwarded from OpenURLServlet
* @param classConfig Implementation Properties forwarded from OpenURLServlet
* @throws ResolverException
*/
public OpenURLJP2Datastream(OpenURLConfig openURLConfig, ClassConfig classConfig) throws ResolverException {
try {
if (!ReferentManager.isInit()) {
props = IOUtils.loadConfigByCP(classConfig.getArg("props"));
implClass = props.getProperty(PROPS_KEY_IMPL_CLASS,DEFAULT_IMPL_CLASS);
ReferentManager.init((IReferentResolver) Class.forName(implClass).newInstance(), props);
}
} catch (IOException e) {
throw new ResolverException("Error attempting to open props file from classpath, disabling " + SVC_ID + " : " + e.getMessage());
} catch (Exception e) {
throw new ResolverException("Unable to inititalize implementation: " + props.getProperty(implClass) + " - " + e.getMessage());
}
}
/**
* Returns the OpenURL service identifier for this implementation of
* info.openurl.oom.Service
*/
public URI getServiceID() throws URISyntaxException {
return new URI(SVC_ID);
}
/**
* Returns the OpenURLResponse of an XML object
*/
public OpenURLResponse resolve(ServiceType serviceType,
ContextObject contextObject, OpenURLRequest openURLRequest,
OpenURLRequestProcessor processor) {
String responseFormat = "application/jp2";;
int status = HttpServletResponse.SC_OK;
byte[] b = null;
try {
ImageRecord r = ReferentManager.getImageRecord(contextObject.getReferent());
if (r != null && r.getImageFile() != null)
b = IOUtils.getBytesFromFile(new File(r.getImageFile()));
else if (r != null && r.getObject() != null) {
if (r.getObject() instanceof byte[])
b = (byte[]) r.getObject();
else if (r.getObject() instanceof InputStream) {
b = IOUtils.getByteArray((InputStream) r.getObject());
}
}
if (b == null)
throw new Exception("Unable to resolve resource");
} catch (Exception e) {
logger.error(e,e);
responseFormat = "text/plain";
status = HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
}
HashMap<String, String> header_map = new HashMap<String, String>();
header_map.put("Content-Length", Integer.toString(b.length));
header_map.put("Date", HttpDate.getHttpDate());
return new OpenURLResponse(status, responseFormat, b, header_map);
}
}