pl.raszkowski.sporttrackersconnector.rest.RESTExecutor.java Source code

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Here is the source code for pl.raszkowski.sporttrackersconnector.rest.RESTExecutor.java

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/*
 * Copyright 2016 Piotr Raszkowski
 *
 * 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 pl.raszkowski.sporttrackersconnector.rest;

import java.io.IOException;
import java.net.URI;
import java.util.Collections;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import pl.raszkowski.sporttrackersconnector.ConnectorException;
import pl.raszkowski.sporttrackersconnector.helper.HttpResponseConverter;
import pl.raszkowski.sporttrackersconnector.helper.HttpResponseVerifier;

public abstract class RESTExecutor {

    private static final String UNABLE_TO_EXECUTE_REQUEST_ERROR_MESSAGE = "Unable to execute request!";
    private static final String WRONG_RESPONSE_STATUS_CODE_ERROR_MESSAGE = "Wrong response status code = %s, expected = %s, for URI = %s.";

    private static final Logger LOG = LoggerFactory.getLogger(RESTExecutor.class);

    private HttpClient httpClient;

    private RESTUriBuilder restUriBuilder = new RESTUriBuilder();

    public RESTExecutor(HttpClient httpClient) {
        this.httpClient = httpClient;
    }

    public String executeGET(String service, String resource) {
        return executeGET(service, resource, Collections.emptyMap());
    }

    public String executeGET(String service, String resource, Map<String, String> parameters) {
        GetParameters getParameters = new GetParameters();
        getParameters.setParameters(parameters);

        return executeGET(service, resource, getParameters);
    }

    public String executeGET(String service, String resource, GetParameters getParameters) {
        try {
            URI uri = buildURI(service, resource, getParameters);

            HttpGet httpGet = new HttpGet(uri);

            LOG.debug("Executing GET request = {}.", httpGet.getURI());

            HttpResponse response = httpClient.execute(httpGet);

            if (HttpResponseVerifier.isNotOk(response)) {
                LOG.error("Wrong response status code = {}, expected = {}, for URI = {}.",
                        response.getStatusLine().getStatusCode(), HttpStatus.SC_OK, uri);
                throw new ConnectorException(String.format(WRONG_RESPONSE_STATUS_CODE_ERROR_MESSAGE,
                        response.getStatusLine().getStatusCode(), HttpStatus.SC_OK, uri));
            }

            return HttpResponseConverter.getAsString(response);
        } catch (IOException e) {
            LOG.error("Unable to execute request for service = {}, resurce = {}.", service, resource, e);
            throw new ConnectorException(UNABLE_TO_EXECUTE_REQUEST_ERROR_MESSAGE, e);
        }
    }

    private URI buildURI(String service, String resource, GetParameters getParameters) {
        String resourceURI = translateResourceToURI(service, resource);

        return restUriBuilder.build(resourceURI, getParameters);
    }

    public abstract String translateResourceToURI(String service, String resource);
}