gov.lanl.adore.djatoka.openurl.OpenURLJP2Ping.java Source code

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Here is the source code for gov.lanl.adore.djatoka.openurl.OpenURLJP2Ping.java

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/*
 * Copyright (c) 2009  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 java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Properties;

import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;

import gov.lanl.adore.djatoka.io.FormatConstants;
import gov.lanl.adore.djatoka.util.IOUtils;
import gov.lanl.util.HttpDate;

import info.freelibrary.djatoka.view.IdentifierResolver;

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;

/**
 * The OpenURLJP2Ping OpenURL Service
 * 
 * @author Ryan Chute
 */
public class OpenURLJP2Ping implements Service, FormatConstants {

    private static Logger LOGGER = LoggerFactory.getLogger(OpenURLJP2Ping.class);

    private static final String DEFAULT_IMPL_CLASS = IdentifierResolver.class.getCanonicalName();

    private static final String PROPS_KEY_IMPL_CLASS = "OpenURLJP2KService.referentResolverImpl";

    private static final String SVC_ID = "info:lanl-repo/svc/ping";

    private static final String STATUS_OK = "OK";

    private static final String STATUS_ACCEPTED = "PROCESSING";

    private static final String RESPONSE_TYPE = "application/json";

    private static String implClass = null;

    private static Properties props = new Properties();

    /**
     * Construct an info:lanl-repo/svc/ping 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 OpenURLJP2Ping(final OpenURLConfig openURLConfig, final 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 (final IOException e) {
            throw new ResolverException("Error attempting to open props file from classpath, disabling " + SVC_ID
                    + " : " + e.getMessage());
        } catch (final 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
     */
    @Override
    public URI getServiceID() throws URISyntaxException {
        return new URI(SVC_ID);
    }

    /**
     * Returns the OpenURLResponse of a JSON object defining image status. Status Codes:
     */
    @Override
    public OpenURLResponse resolve(final ServiceType serviceType, final ContextObject contextObject,
            final OpenURLRequest openURLRequest, final OpenURLRequestProcessor processor) {
        final String responseFormat = RESPONSE_TYPE;
        int status = HttpServletResponse.SC_NOT_FOUND;
        byte[] bytes = new byte[] {};

        try {
            final String id = ((URI) contextObject.getReferent().getDescriptors()[0]).toASCIIString();
            status = ReferentManager.getResolver().getStatus(id);

            if (status != HttpServletResponse.SC_NOT_FOUND) {
                final ObjectMapper mapper = new ObjectMapper();
                final ObjectNode rootNode = mapper.createObjectNode();

                String res_status = null;

                if (status == HttpServletResponse.SC_OK) {
                    res_status = STATUS_OK;
                } else if (status == HttpServletResponse.SC_ACCEPTED) {
                    res_status = STATUS_ACCEPTED;
                }

                rootNode.put("identifier", id);
                rootNode.put("status", res_status);
                bytes = mapper.writeValueAsBytes(rootNode);
            }
        } catch (final Exception e) {
            LOGGER.error(e.getMessage(), e);
            status = HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
        }

        final HashMap<String, String> header_map = new HashMap<String, String>();
        header_map.put("Content-Length", Integer.toString(bytes.length));
        header_map.put("Date", HttpDate.getHttpDate());
        return new OpenURLResponse(status, responseFormat, bytes, header_map);
    }
}