ch.icclab.cyclops.publish.APICaller.java Source code

Introduction

Here is the source code for ch.icclab.cyclops.publish.APICaller.java

Source

package ch.icclab.cyclops.publish;
/*
 * Copyright (c) 2016. Zuercher Hochschule fuer Angewandte Wissenschaften
 *  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.
 */

import ch.icclab.cyclops.util.BeanList;
import com.google.gson.Gson;
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;

import java.net.URL;
import java.util.List;
import java.util.Map;

/**
 * Author: Skoviera
 * Created: 29/07/16
 * Description: Call API endpoint
 */
public class APICaller {

    public class Response {
        private String object;
        private int status;

        public Response(String obj, int stat) {
            object = obj;
            status = stat;
        }

        public int getStatus() {
            return status;
        }

        public String getAsString() throws Exception {
            return object;
        }

        public List getAsList() throws Exception {
            return new Gson().fromJson(object, List.class);
        }

        public Map getAsMap() throws Exception {
            return new Gson().fromJson(object, Map.class);
        }

        public Object getAsClass(Class clazz) throws Exception {
            return new Gson().fromJson(object, clazz);
        }

        public List getAsListOfType(Class clazz) throws Exception {
            List<Map> list = new Gson().fromJson(object, List.class);
            return BeanList.populate(list, clazz);
        }
    }

    /**
     * Perform POST query and return Response
     * @param endpoint to be called
     * @param object to be passed
     * @return Response object
     * @throws Exception
     */
    public APICaller.Response post(URL endpoint, Object object) throws Exception {
        // prepare connection
        HttpClient client = HttpClientBuilder.create().build();

        // create request
        HttpPost request = new HttpPost(endpoint.toURI());
        StringEntity entity = new StringEntity(new Gson().toJson(object));
        request.addHeader("Accept", "application/json");
        request.addHeader("Content-Type", "application/json");
        request.setEntity(entity);

        // execute response
        HttpResponse response = client.execute(request);
        return new Response(IOUtils.toString(response.getEntity().getContent()),
                response.getStatusLine().getStatusCode());
    }

    /**
     * Perform GET query and return Response
     * @param endpoint to be called
     * @return Response object
     * @throws Exception
     */
    public APICaller.Response get(URL endpoint) throws Exception {
        // prepare connection
        HttpClient client = HttpClientBuilder.create().build();

        // create request
        HttpGet request = new HttpGet(endpoint.toURI());
        request.addHeader("Accept", "application/json");
        request.addHeader("Content-Type", "application/json");

        // execute response
        HttpResponse response = client.execute(request);
        return new Response(IOUtils.toString(response.getEntity().getContent()),
                response.getStatusLine().getStatusCode());
    }
}