tern.repository.TernRepositoryHelper.java Source code

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Here is the source code for tern.repository.TernRepositoryHelper.java

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/**
 *  Copyright (c) 2013-2016 Angelo ZERR.
 *  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:
 *  Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
 */
package tern.repository;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import com.eclipsesource.json.JsonObject;
import com.eclipsesource.json.JsonObject.Member;

import tern.TernException;
import tern.server.ITernModule;
import tern.utils.IOUtils;
import tern.utils.StringUtils;

/**
 * Helper for tern repository.
 *
 */
public class TernRepositoryHelper {

    /**
     * Default tern repository.json URL
     */
    public static final String DEFAULT_TERN_REPOSITORY_URL = "https://raw.githubusercontent.com/paulvi/tern-plugins/master/plugins.json";

    /**
     * Load tern modules coming from the given repository.json URL.
     * 
     * @param repositoryURL
     *            repository URL.
     * @return
     * @throws IOException
     * @throws ClientProtocolException
     * @throws TernException
     */
    public static List<ITernModule> loadModules(String repositoryURL) throws IOException, TernException {
        // load repository.json with HTTP client.
        HttpClient httpClient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(repositoryURL);
        HttpResponse httpResponse = httpClient.execute(httpGet);
        HttpEntity entity = httpResponse.getEntity();
        InputStream in = entity.getContent();
        // Check the status
        StatusLine statusLine = httpResponse.getStatusLine();
        int statusCode = statusLine.getStatusCode();
        if (statusCode != HttpStatus.SC_OK) {
            String message = IOUtils.toString(in);
            if (StringUtils.isEmpty(message)) {
                throw new TernException(statusLine.toString());
            }
            throw new TernException(message);
        }

        // read JSON and create tern modules list
        JsonObject repository = JsonObject.readFrom(new InputStreamReader(in));
        ITernModule module = null;
        List<ITernModule> modules = new ArrayList<ITernModule>();
        for (Member member : repository) {
            module = new TernModuleToDownload(member.getName(), (JsonObject) member.getValue());
            modules.add(module);
        }
        return modules;
    }

}