1/* 2 * Copyright (C) 2010 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.i18n.addressinput; 18 19import org.apache.http.client.HttpClient; 20import org.apache.http.client.methods.HttpGet; 21import org.apache.http.client.methods.HttpUriRequest; 22import org.apache.http.impl.client.BasicResponseHandler; 23import org.apache.http.impl.client.DefaultHttpClient; 24import org.apache.http.params.HttpConnectionParams; 25import org.apache.http.params.HttpParams; 26 27import java.io.UnsupportedEncodingException; 28import java.net.URLEncoder; 29 30/** 31 * Android implementation of those parts of the com.google.gwt.jsonp.client.JsonpRequestBuilder 32 * class that the CacheData class uses. 33 */ 34class JsonpRequestBuilder { 35 36 /** 37 * Re-implementation of the com.google.gwt.user.client.rpc.AsyncCallback interface. 38 */ 39 interface AsyncCallback<T> { 40 41 public void onFailure(Throwable caught); 42 43 public void onSuccess(T result); 44 } 45 46 /** 47 * @param timeout The expected timeout (ms) for this request. 48 */ 49 void setTimeout(int timeout) { 50 HttpParams params = AsyncHttp.CLIENT.getParams(); 51 HttpConnectionParams.setConnectionTimeout(params, timeout); 52 HttpConnectionParams.setSoTimeout(params, timeout); 53 } 54 55 /** 56 * Sends a JSONP request and expects a JsoMap object as a result. 57 */ 58 void requestObject(String url, AsyncCallback<JsoMap> callback) { 59 HttpUriRequest request = new HttpGet(encodeUrl(url)); 60 (new AsyncHttp(request, callback)).start(); 61 } 62 63 /** 64 * Simple implementation of asynchronous HTTP GET. 65 */ 66 private static class AsyncHttp extends Thread { 67 68 private static final HttpClient CLIENT = new DefaultHttpClient(); 69 70 private HttpUriRequest mRequest; 71 72 private AsyncCallback<JsoMap> mCallback; 73 74 protected AsyncHttp(HttpUriRequest request, AsyncCallback<JsoMap> callback) { 75 mRequest = request; 76 mCallback = callback; 77 } 78 79 @Override 80 public void run() { 81 try { 82 final String response; 83 synchronized (CLIENT) { 84 response = CLIENT.execute(mRequest, new BasicResponseHandler()); 85 } 86 mCallback.onSuccess(JsoMap.buildJsoMap(response)); 87 } catch (Exception e) { 88 mCallback.onFailure(e); 89 } 90 } 91 } 92 93 /** 94 * A quick hack to transform a string into an RFC 3986 compliant URL. 95 * 96 * TODO: Refactor the code to stop passing URLs around as strings, to eliminate the need for 97 * this hack. 98 */ 99 private static String encodeUrl(String url) { 100 int length = url.length(); 101 StringBuilder tmp = new StringBuilder(length); 102 103 try { 104 for (int i = 0; i < length; i++) { 105 int j = i; 106 char c = '\0'; 107 for (; j < length; j++) { 108 c = url.charAt(j); 109 if (c == ':' || c == '/') { 110 break; 111 } 112 } 113 if (j == length) { 114 tmp.append(URLEncoder.encode(url.substring(i), "UTF-8")); 115 break; 116 } else if (j > i) { 117 tmp.append(URLEncoder.encode(url.substring(i, j), "UTF-8")); 118 tmp.append(c); 119 i = j; 120 } else { 121 tmp.append(c); 122 } 123 } 124 } catch (UnsupportedEncodingException e) { 125 throw new RuntimeException(e); // Impossible. 126 } 127 128 return tmp.toString(); 129 } 130} 131