com.javafxpert.wikibrowser.WikiLocatorController.java Source code

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Here is the source code for com.javafxpert.wikibrowser.WikiLocatorController.java

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/*
 * Copyright 2015 the original author or authors.
 *
 * 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 com.javafxpert.wikibrowser;

import com.javafxpert.wikibrowser.model.locator.LocatorResponse;
import com.javafxpert.wikibrowser.model.locator.Item;
import com.javafxpert.wikibrowser.model.locator.Sitelinks;
import com.javafxpert.wikibrowser.model.locator.ItemInfo;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.net.URI;
import java.util.Map;
import java.util.Optional;
import java.util.Set;

/**
 * Created by jamesweaver on 10/13/15.
 */
@RestController
@RequestMapping("/locator")
public class WikiLocatorController {
    private Log log = LogFactory.getLog(getClass());

    private final WikiBrowserProperties wikiBrowserProperties;

    @Autowired
    public WikiLocatorController(WikiBrowserProperties wikiBrowserProperties) {
        this.wikiBrowserProperties = wikiBrowserProperties;
    }

    @RequestMapping(method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Object> locatorEndpoint(@RequestParam(value = "id", defaultValue = "") String itemId,
            @RequestParam(value = "lang") String lang) {

        String language = wikiBrowserProperties.computeLang(lang);

        ItemInfo itemInfo = null;
        if (!itemId.equals("")) {
            itemInfo = id2Name(itemId, language);
        }

        return Optional.ofNullable(itemInfo).map(cr -> new ResponseEntity<>((Object) cr, HttpStatus.OK))
                .orElse(new ResponseEntity<>("Wikidata query unsuccessful", HttpStatus.INTERNAL_SERVER_ERROR));
    }

    public ItemInfo id2Name(String itemId, String lang) {
        LocatorResponse locatorResponse = null;
        ItemInfo itemInfo = null;

        //TODO: Implement better way of creating the query represented by the following variables
        String i2nqa = "https://www.wikidata.org/w/api.php?action=wbgetentities&format=json&ids=";
        String i2nqb = ""; // Some item ID e.g. Q7259
        String i2nqc = "&props=sitelinks%7Csitelinks/urls&sitefilter=";
        String i2nqd = ""; // Some language code e.g. en
        String i2nqe = "wiki";

        i2nqb = itemId;
        i2nqd = lang;
        String wdQuery = i2nqa + i2nqb + i2nqc + i2nqd + i2nqe;

        return queryProcessLocatorResponse(wdQuery, lang);
    }

    private ItemInfo queryProcessLocatorResponse(String query, String lang) {
        query = query.replaceAll(" ", "%20");
        log.info("query: " + query);
        LocatorResponse locatorResponse = null;
        ItemInfo itemInfo = new ItemInfo();

        try {
            locatorResponse = new RestTemplate().getForObject(new URI(query), LocatorResponse.class);

            log.info(locatorResponse.toString());

            Map<String, Item> itemMap = locatorResponse.getEntities();
            Item item = itemMap.get(itemMap.keySet().toArray()[0]);

            String itemId = item.getId();
            Item itemRef = itemMap.get(itemId);

            //TODO: Investigate why this is occasionally null and handle it better
            if (itemRef != null) {
                Map<String, Sitelinks> sitelinksMap = itemRef.getSitelinks();

                if (sitelinksMap != null && !sitelinksMap.isEmpty() && !sitelinksMap.keySet().isEmpty()) {
                    Sitelinks sitelink = sitelinksMap.get(sitelinksMap.keySet().toArray()[0]);
                    String urlStr = sitelink.getUrl();
                    String titleStr = sitelink.getTitle();
                    String nameStr = urlStr.substring(urlStr.lastIndexOf("/") + 1);
                    itemInfo.setArticleUrl(urlStr);
                    itemInfo.setArticleTitle(titleStr);
                    itemInfo.setArticleName(nameStr);
                    itemInfo.setSite(sitelink.getSite());
                }
            } else {
                log.info("item is null");
            }
            itemInfo.setLang(lang);
            itemInfo.setItemId(item.getId());
        } catch (Exception e) { //TODO: Consider moving catch down further in simlar method for all Controller classes
            e.printStackTrace();
            log.info("Caught exception when calling wikidata name to ID service " + e);
        }

        return itemInfo;
    }

}