com.grayfox.android.client.BaseApi.java Source code

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Here is the source code for com.grayfox.android.client.BaseApi.java

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/*
 * Copyright 2014-2015 Daniel Pedraza-Arcega
 *
 * 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.grayfox.android.client;

import android.content.Context;
import android.util.Log;

import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

import com.grayfox.android.client.model.ApiResponse;
import com.grayfox.android.client.http.Charset;
import com.grayfox.android.client.http.ContentType;
import com.grayfox.android.client.http.Header;

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

import java.io.IOException;
import java.util.Locale;

abstract class BaseApi {

    private static final String TAG = "BaseApi";
    private static final MediaType JSON_MEDIA_TYPE = MediaType.parse("application/json; charset=utf-8");

    private final Context context;

    private OkHttpClient client;

    protected BaseApi(Context context) {
        this.context = context;
        this.client = new OkHttpClient();
    }

    protected String getString(int resId) {
        return context.getString(resId);
    }

    protected <T> T get(String url, Class<T> responseClass) {
        Log.d(TAG, url);
        return callForResult(buildRequestForJson(url).get().build(), responseClass);
    }

    protected <T> T put(String url, Object payload, Class<T> responseClass) {
        Log.d(TAG, url);
        Request.Builder requestBuilder = buildRequestForJson(url);
        if (payload != null) {
            requestBuilder.header(Header.CONTENT_TYPE.getValue(), ContentType.APPLICATION_JSON.getMimeType())
                    .put(RequestBody.create(JSON_MEDIA_TYPE, new Gson().toJson(payload))).build();
        } else
            requestBuilder.put(RequestBody.create(null, new byte[0]));
        return callForResult(requestBuilder.build(), responseClass);
    }

    protected <T> T delete(String url, Object payload, Class<T> responseClass) {
        Log.d(TAG, url);
        Request.Builder requestBuilder = buildRequestForJson(url);
        if (payload != null) {
            requestBuilder.header(Header.CONTENT_TYPE.getValue(), ContentType.APPLICATION_JSON.getMimeType())
                    .method("DELETE", RequestBody.create(JSON_MEDIA_TYPE, new Gson().toJson(payload))).build();
        } else
            requestBuilder.delete();
        return callForResult(requestBuilder.build(), responseClass);
    }

    private Request.Builder buildRequestForJson(String url) {
        return new Request.Builder().url(url)
                .header(Header.ACCEPT.getValue(), ContentType.APPLICATION_JSON.getMimeType())
                .header(Header.ACCEPT_LANGUAGE.getValue(), Locale.getDefault().getLanguage())
                .header(Header.ACCEPT_CHARSET.getValue(), Charset.UTF_8.getValue());
    }

    private <T> T callForResult(Request request, Class<T> responseClass) {
        try {
            Response response = client.newCall(request).execute();
            Log.d(TAG, "Response code -> " + response.code());
            JsonObject obj = new JsonParser().parse(response.body().string()).getAsJsonObject();
            ApiResponse.ErrorResponse error = new Gson().fromJson(obj.get("error"),
                    ApiResponse.ErrorResponse.class);
            T responseObject = new Gson().fromJson(obj.get("response"), responseClass);
            ApiResponse<T> apiResponse = new ApiResponse<>();
            apiResponse.setError(error);
            apiResponse.setResponse(responseObject);
            if (apiResponse.getError() == null)
                return apiResponse.getResponse();
            else {
                Log.e(TAG, "Response error -> " + apiResponse.getError());
                throw new ApiException(apiResponse.getError().getErrorMessage());
            }
        } catch (IOException ex) {
            Log.e(TAG, "Error while making request", ex);
            throw new ApiException(getString(R.string.network_request_error), ex);
        }
    }
}