com.google.samples.apps.iosched.server.schedule.input.fetcher.VendorAPIEntityFetcher.java Source code

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Here is the source code for com.google.samples.apps.iosched.server.schedule.input.fetcher.VendorAPIEntityFetcher.java

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/*
 * Copyright 2014 Google Inc. All rights reserved.
 *
 * 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.google.samples.apps.iosched.server.schedule.input.fetcher;

import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.stream.JsonReader;
import com.google.samples.apps.iosched.server.schedule.Config;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * EntityFetcher that fetches entities from the schedule CMS's HTTP server.
 *
 * This will need to be modified to use a custom backend for your event.
 */
@SuppressWarnings("unused")
public class VendorAPIEntityFetcher implements EntityFetcher {
    static Logger LOG = Logger.getLogger(VendorAPIEntityFetcher.class.getName());

    // TODO: Hook up to your backend data source
    public static final String BASE_URL = "https://example.com/api/";

    @Override
    public JsonElement fetch(Enum<?> entityType, Map<String, String> params) throws IOException {
        StringBuilder urlStr = new StringBuilder(BASE_URL);
        urlStr.append(entityType.name());
        if (params != null && !params.isEmpty()) {
            urlStr.append("?");
            for (Map.Entry<String, String> param : params.entrySet()) {
                urlStr.append(param.getKey()).append("=").append(param.getValue()).append("&");

            }
            urlStr.deleteCharAt(urlStr.length() - 1);
        }

        URL url = new URL(urlStr.toString());
        if (LOG.isLoggable(Level.INFO)) {
            LOG.info("URL requested: " + url);
        }

        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setReadTimeout(1000 * 30); // 30 seconds
        connection.setRequestProperty("code", Config.CMS_API_CODE);
        connection.setRequestProperty("apikey", Config.CMS_API_KEY);

        InputStream stream = connection.getInputStream();
        JsonReader reader = new JsonReader(new InputStreamReader(stream, Charset.forName("UTF-8")));
        return new JsonParser().parse(reader);
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return "HttpEntityFetcher(baseURL=" + BASE_URL + ")";
    }
}