de.topicmapslab.tmcledit.model.psiprovider.internal.Subj3ctPSIProvider.java Source code

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Here is the source code for de.topicmapslab.tmcledit.model.psiprovider.internal.Subj3ctPSIProvider.java

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/*******************************************************************************
 * Copyright (c) 2008, 2009 Topic Maps Lab and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Hannes Niederhausen - initial API and implementation
 *******************************************************************************/
package de.topicmapslab.tmcledit.model.psiprovider.internal;

import java.io.StringReader;
import java.net.SocketTimeoutException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.xml.sax.InputSource;

import de.topicmapslab.tmcledit.model.TmcleditEditPlugin;
import de.topicmapslab.tmcledit.model.psiprovider.PSIProvider;
import de.topicmapslab.tmcledit.model.psiprovider.PSIProviderResult;

/**
 * @author Hannes Niederhausen
 *
 */
public class Subj3ctPSIProvider extends PSIProvider {

    public Set<PSIProviderResult> getSubjectIdentifier() {
        if (getName().length() == 0)
            return Collections.emptySet();

        HttpMethod method = null;
        try {
            String url = "http://api.subj3ct.com/subjects/search";

            HttpClient client = new HttpClient();
            method = new GetMethod(url);

            ArrayList<NameValuePair> params = new ArrayList<NameValuePair>(2);
            params.add(new NameValuePair("format", "xml"));
            params.add(new NameValuePair("query", getName()));
            method.setQueryString(params.toArray(new NameValuePair[params.size()]));

            client.getParams().setSoTimeout(5000);
            client.executeMethod(method);

            String result = method.getResponseBodyAsString();

            SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
            Subj3ctXmlHandler handler = new Subj3ctXmlHandler();
            parser.parse(new InputSource(new StringReader(result)), handler);

            List<Subje3ctResult> resultList = handler.getResultList();
            if (resultList.size() == 0) {
                return Collections.emptySet();
            }

            Set<PSIProviderResult> resultSet = new HashSet<PSIProviderResult>(resultList.size());
            for (Subje3ctResult r : resultList) {
                String description = "";
                if (r.name != null)
                    description = "Name: " + r.name + "\n";
                if (r.description != null)
                    description += "Description: " + r.description + "\n";

                description += "\n\nThis service is provided by http://www.subj3ct.com";

                resultSet.add(new PSIProviderResult(r.identifier, description));
            }

            return Collections.unmodifiableSet(resultSet);
        } catch (UnknownHostException e) {
            // no http connection -> no results
            TmcleditEditPlugin.logInfo(e);
            return Collections.emptySet();
        } catch (SocketTimeoutException e) {
            // timeout -> no results
            TmcleditEditPlugin.logInfo(e);
            return Collections.emptySet();
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            if (method != null)
                method.releaseConnection();
        }
    }

}