it.unipi.di.acube.batframework.systemPlugins.ERDSystem.java Source code

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Here is the source code for it.unipi.di.acube.batframework.systemPlugins.ERDSystem.java

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/**
 *  Copyright 2014 Marco Cornolti
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package it.unipi.di.acube.batframework.systemPlugins;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Calendar;
import java.util.HashSet;

import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.StringBody;

import it.unipi.di.acube.batframework.data.Tag;
import it.unipi.di.acube.batframework.problems.C2WSystem;
import it.unipi.di.acube.batframework.utils.AnnotationException;
import it.unipi.di.acube.batframework.utils.FreebaseApi;
import it.unipi.di.acube.batframework.utils.WikipediaApiInterface;

/**
 * An interface to a generic ERD System, as defined in <a
 * href="http://web-ngram.research.microsoft.com/erd2014/Rules.aspx"
 * >http://web-ngram.research.microsoft.com/erd2014/Rules.aspx</a>.
 * 
 * @author Marco Cornolti
 * 
 */
public class ERDSystem implements C2WSystem {
    private String url;
    private String name;
    private String run;
    private long lastTime = -1;
    private long calib = -1;
    private FreebaseApi freebApi;
    private WikipediaApiInterface wikiApi;

    /**
     * @param url
     *            the URL of the ERD system.
     * @param run
     *            the runID of the ERD system.
     * @param name
     *            the name of the system.
     * @param freebApi
     *            an API to Freebase.
     * @param wikiApi
     *            an API to Wikipedia.
     */
    public ERDSystem(String url, String run, String name, FreebaseApi freebApi, WikipediaApiInterface wikiApi) {
        this.url = url;
        this.name = name;
        this.run = run;
        this.freebApi = freebApi;
        this.wikiApi = wikiApi;
    }

    @Override
    public String getName() {
        return this.name;
    }

    @Override
    public long getLastAnnotationTime() {
        return lastTime - calib > 0 ? lastTime - calib : 0;
    }

    @Override
    public HashSet<Tag> solveC2W(String text) throws AnnotationException {
        lastTime = Calendar.getInstance().getTimeInMillis();
        HashSet<Tag> res = new HashSet<Tag>();
        try {
            URL erdApi = new URL(url);

            HttpURLConnection connection = (HttpURLConnection) erdApi.openConnection();
            connection.setDoOutput(true);
            connection.setRequestMethod("POST");

            MultipartEntity multipartEntity = new MultipartEntity(HttpMultipartMode.STRICT);
            multipartEntity.addPart("runID", new StringBody(this.run));
            multipartEntity.addPart("TextID", new StringBody("" + text.hashCode()));
            multipartEntity.addPart("Text", new StringBody(text));

            connection.setRequestProperty("Content-Type", multipartEntity.getContentType().getValue());
            OutputStream out = connection.getOutputStream();
            try {
                multipartEntity.writeTo(out);
            } finally {
                out.close();
            }

            int status = ((HttpURLConnection) connection).getResponseCode();
            if (status != 200) {
                BufferedReader br = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
                String line = null;
                while ((line = br.readLine()) != null)
                    System.err.println(line);
                throw new RuntimeException();
            }

            BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line = null;
            while ((line = br.readLine()) != null) {
                String mid = line.split("\t")[2];
                String title = freebApi.midToTitle(mid);
                int wid;
                if (title == null || (wid = wikiApi.getIdByTitle(title)) == -1)
                    System.err.println("Discarding mid=" + mid);
                else
                    res.add(new Tag(wid));
            }

        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }

        lastTime = Calendar.getInstance().getTimeInMillis() - lastTime;
        return res;
    }
}