Java tutorial
/** * Copyright (C) 2012 SINTEF <fabien@fleurey.com> * * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, Version 3, 29 June 2007; * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.gnu.org/licenses/lgpl-3.0.txt * * 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 org.sensapp.android.sensappdroid.restrequests; import android.net.Uri; import android.util.Log; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.StatusLine; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpDelete; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.methods.HttpPut; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.DefaultHttpClient; import org.sensapp.android.sensappdroid.json.JsonPrinter; import org.sensapp.android.sensappdroid.models.Composite; import org.sensapp.android.sensappdroid.models.Sensor; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.URI; import java.net.URISyntaxException; import java.nio.charset.Charset; public final class RestRequest { public static final String SENSOR_PATH = "/sensapp/registry/sensors"; public static final String COMPOSITE_PATH = "/sensapp/registry/composite/sensors"; private static final String TAG = RestRequest.class.getSimpleName(); private static final String DISPATCHER_PATH = "/sensapp/dispatch"; private RestRequest() { } public static boolean isSensorRegistered(Sensor sensor) throws RequestErrorException { URI target; try { target = new URI(sensor.getUri().toString() + SENSOR_PATH + "/" + sensor.getName()); } catch (URISyntaxException e) { e.printStackTrace(); throw new RequestErrorException(e.getMessage()); } HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(target); StatusLine status; try { status = client.execute(request).getStatusLine(); } catch (Exception e) { throw new RequestErrorException(e.getMessage()); } if (status.getStatusCode() == 200) { return true; } return false; } public static String postSensor(Sensor sensor) throws RequestErrorException { String content = JsonPrinter.sensorToJson(sensor); URI target; try { target = new URI(sensor.getUri().toString() + SENSOR_PATH); } catch (URISyntaxException e1) { e1.printStackTrace(); throw new RequestErrorException(e1.getMessage()); } HttpClient client = new DefaultHttpClient(); HttpPost request = new HttpPost(target); request.setHeader("Content-type", "application/json"); String response = null; try { StringEntity seContent = new StringEntity(content); seContent.setContentType("text/json"); request.setEntity(seContent); response = resolveResponse(client.execute(request)); } catch (Exception e) { throw new RequestErrorException(e.getMessage()); } return response; } public static String deleteSensor(Uri uri, Sensor sensor) throws RequestErrorException { URI target; try { target = new URI(uri.toString() + SENSOR_PATH + "/" + sensor.getName()); } catch (URISyntaxException e) { e.printStackTrace(); throw new RequestErrorException(e.getMessage()); } HttpClient client = new DefaultHttpClient(); HttpDelete request = new HttpDelete(target); request.setHeader("Content-type", "application/json"); String response = null; try { response = resolveResponse(client.execute(request)); } catch (Exception e) { throw new RequestErrorException(e.getMessage()); } return response; } public static String putData(Uri uri, String data) throws RequestErrorException { URI target; try { target = new URI(uri.toString() + DISPATCHER_PATH); } catch (URISyntaxException e1) { e1.printStackTrace(); throw new RequestErrorException(e1.getMessage()); } HttpClient client = new DefaultHttpClient(); HttpPut request = new HttpPut(target); request.setHeader("Content-type", "application/json"); String response = null; try { StringEntity seContent = new StringEntity(data); seContent.setContentType("text/json"); request.setEntity(seContent); response = resolveResponse(client.execute(request)); } catch (Exception e) { throw new RequestErrorException(e.getMessage()); } if (response.trim().length() > 2) { throw new RequestErrorException("Sensor not registred: " + response); } return response; } public static boolean isCompositeRegistered(Composite composite) throws RequestErrorException { URI target; try { target = new URI(composite.getUri().toString() + COMPOSITE_PATH + "/" + composite.getName()); } catch (URISyntaxException e1) { e1.printStackTrace(); throw new RequestErrorException(e1.getMessage()); } HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(target); StatusLine status; try { status = client.execute(request).getStatusLine(); } catch (Exception e) { throw new RequestErrorException(e.getMessage()); } if (status.getStatusCode() == 200) { return true; } return false; } public static String postComposite(Composite composite) throws RequestErrorException { String content = JsonPrinter.compositeToJson(composite); URI target; try { target = new URI(composite.getUri().toString() + COMPOSITE_PATH); } catch (URISyntaxException e1) { e1.printStackTrace(); throw new RequestErrorException(e1.getMessage()); } HttpClient client = new DefaultHttpClient(); HttpPost request = new HttpPost(target); request.setHeader("Content-type", "application/json"); String response = null; try { StringEntity seContent = new StringEntity(content); seContent.setContentType("text/json"); request.setEntity(seContent); response = resolveResponse(client.execute(request)); } catch (Exception e) { throw new RequestErrorException(e.getMessage()); } return response; } private static String convertStreamToString(InputStream is) { BufferedReader reader = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8"))); StringBuilder sb = new StringBuilder(); String line = null; try { while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } } catch (IOException e) { e.printStackTrace(); } finally { try { is.close(); } catch (IOException e) { e.printStackTrace(); } } return sb.toString(); } private static String resolveResponse(HttpResponse response) throws RequestErrorException { StatusLine status = response.getStatusLine(); HttpEntity entity = response.getEntity(); String result = null; if (entity != null) { InputStream inputStream = null; try { inputStream = entity.getContent(); result = convertStreamToString(inputStream); } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (inputStream != null) { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } } if (status.getStatusCode() == 200) { return result; } else if (status.getStatusCode() == 409) { Log.w(TAG, status.toString()); Log.w(TAG, result); return result; } else { throw new RequestErrorException("Invalid response from server: " + result, new IOException(status.toString()), status.getStatusCode()); } } }