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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import org.json.JSONArray;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.text.TextUtils;
import android.util.Log;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
/**
* Use network-based search suggestions.
*/
public class SuggestClient {
private static final String LOGTAG = "GeckoSuggestClient";
private static final String USER_AGENT = GeckoAppShell.getGeckoInterface().getDefaultUAString();
private final Context mContext;
private final int mTimeout;
// should contain the string "__searchTerms__", which is replaced with the query
private final String mSuggestTemplate;
// the maximum number of suggestions to return
private final int mMaxResults;
// used by robocop for testing; referenced via reflection
private boolean mCheckNetwork;
// used to make suggestions appear instantly after opt-in
private String mPrevQuery;
private ArrayList<String> mPrevResults;
public SuggestClient(Context context, String suggestTemplate, int timeout, int maxResults) {
mContext = context;
mMaxResults = maxResults;
mSuggestTemplate = suggestTemplate;
mTimeout = timeout;
mCheckNetwork = true;
}
public SuggestClient(Context context, String suggestTemplate, int timeout) {
this(context, suggestTemplate, timeout, Integer.MAX_VALUE);
}
/**
* Queries for a given search term and returns an ArrayList of suggestions.
*/
public ArrayList<String> query(String query) {
if (query.equals(mPrevQuery))
return mPrevResults;
ArrayList<String> suggestions = new ArrayList<String>();
if (TextUtils.isEmpty(mSuggestTemplate) || TextUtils.isEmpty(query)) {
return suggestions;
}
if (!isNetworkConnected() && mCheckNetwork) {
Log.i(LOGTAG, "Not connected to network");
return suggestions;
}
try {
String encoded = URLEncoder.encode(query, "UTF-8");
String suggestUri = mSuggestTemplate.replace("__searchTerms__", encoded);
URL url = new URL(suggestUri);
String json = null;
HttpURLConnection urlConnection = null;
InputStream in = null;
try {
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setConnectTimeout(mTimeout);
urlConnection.setRequestProperty("User-Agent", USER_AGENT);
in = new BufferedInputStream(urlConnection.getInputStream());
json = convertStreamToString(in);
} finally {
if (urlConnection != null)
urlConnection.disconnect();
if (in != null) {
try {
in.close();
} catch (IOException e) {
Log.e(LOGTAG, "error", e);
}
}
}
if (json != null) {
/*
* Sample result:
* ["foo",["food network","foothill college","foot locker",...]]
*/
JSONArray results = new JSONArray(json);
JSONArray jsonSuggestions = results.getJSONArray(1);
int added = 0;
for (int i = 0; (i < jsonSuggestions.length()) && (added < mMaxResults); i++) {
String suggestion = jsonSuggestions.getString(i);
if (!suggestion.equalsIgnoreCase(query)) {
suggestions.add(suggestion);
added++;
}
}
} else {
Log.e(LOGTAG, "Suggestion query failed");
}
} catch (Exception e) {
Log.e(LOGTAG, "Error", e);
}
mPrevQuery = query;
mPrevResults = suggestions;
return suggestions;
}
private boolean isNetworkConnected() {
NetworkInfo networkInfo = getActiveNetworkInfo();
return networkInfo != null && networkInfo.isConnected();
}
private NetworkInfo getActiveNetworkInfo() {
ConnectivityManager connectivity = (ConnectivityManager) mContext
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity == null)
return null;
return connectivity.getActiveNetworkInfo();
}
private String convertStreamToString(java.io.InputStream is) {
try {
return new java.util.Scanner(is).useDelimiter("\\A").next();
} catch (java.util.NoSuchElementException e) {
return "";
}
}
}
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