com.howareyoudoing.data.net.ApiConnection.java Source code

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Here is the source code for com.howareyoudoing.data.net.ApiConnection.java

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/**
 * Copyright (C) 2015 Fernando Cejas Open Source Project
 *
 * 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.howareyoudoing.data.net;

import android.support.annotation.Nullable;

import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;

/**
 * Api Connection class used to retrieve data from the cloud.
 * Implements {@link java.util.concurrent.Callable} so when executed asynchronously can
 * return a value.
 */
class ApiConnection implements Callable<String> {

    private static final String CONTENT_TYPE_LABEL = "Content-Type";
    private static final String CONTENT_TYPE_VALUE_JSON = "application/json; charset=utf-8";

    private URL url;
    private String response;
    private RequestBody body;

    private ApiConnection(String url) throws MalformedURLException {
        this.url = new URL(url);
    }

    private ApiConnection(String url, RequestBody body) throws MalformedURLException {
        this.url = new URL(url);
        this.body = body;
    }

    static ApiConnection createGET(String url) throws MalformedURLException {
        return new ApiConnection(url);
    }

    static ApiConnection createPOST(String url, RequestBody body) throws MalformedURLException {
        return new ApiConnection(url, body);
    }

    /**
     * Do a request to an api synchronously.
     * It should not be executed in the main thread of the application.
     *
     * @return A string response
     */
    @Nullable
    String requestSyncCall() {
        connectToApi();
        return response;
    }

    private void connectToApi() {
        OkHttpClient okHttpClient = this.createClient();
        final Request request;
        if (body != null) {
            request = new Request.Builder().url(this.url).addHeader(CONTENT_TYPE_LABEL, CONTENT_TYPE_VALUE_JSON)
                    .post(body).build();
        } else {
            request = new Request.Builder().url(this.url).addHeader(CONTENT_TYPE_LABEL, CONTENT_TYPE_VALUE_JSON)
                    .get().build();
        }
        try {
            this.response = okHttpClient.newCall(request).execute().body().string();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private OkHttpClient createClient() {
        final OkHttpClient okHttpClient = new OkHttpClient();
        okHttpClient.setReadTimeout(10000, TimeUnit.MILLISECONDS);
        okHttpClient.setConnectTimeout(15000, TimeUnit.MILLISECONDS);

        return okHttpClient;
    }

    @Override
    public String call() throws Exception {
        return requestSyncCall();
    }
}