81 lines
2.6 KiB
Java
81 lines
2.6 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.gecko.util;
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import java.util.HashSet;
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import java.util.Set;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.mozilla.gecko.AppConstants.Versions;
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import android.content.SharedPreferences;
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import android.util.Log;
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public class PrefUtils {
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private static final String LOGTAG = "GeckoPrefUtils";
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// Cross version compatible way to get a string set from a pref
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public static Set<String> getStringSet(final SharedPreferences prefs,
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final String key,
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final Set<String> defaultVal) {
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if (!prefs.contains(key)) {
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return defaultVal;
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}
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if (Versions.preHC) {
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return getFromJSON(prefs, key);
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}
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// If this is Android version >= 11, try to use a Set<String>.
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try {
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return prefs.getStringSet(key, new HashSet<String>());
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} catch(ClassCastException ex) {
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// A ClassCastException means we've upgraded from a pre-v11 Android to a new one
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final Set<String> val = getFromJSON(prefs, key);
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SharedPreferences.Editor edit = prefs.edit();
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putStringSet(edit, key, val).apply();
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return val;
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}
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}
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private static Set<String> getFromJSON(SharedPreferences prefs, String key) {
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try {
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final String val = prefs.getString(key, "[]");
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return JSONUtils.parseStringSet(new JSONArray(val));
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} catch(JSONException ex) {
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Log.i(LOGTAG, "Unable to parse JSON", ex);
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}
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return new HashSet<String>();
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}
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/**
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* Cross version compatible way to save a set of strings.
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* <p>
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* This method <b>does not commit</b> any transaction. It is up to callers
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* to commit.
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*
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* @param editor to write to.
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* @param key to write.
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* @param vals comprising string set.
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* @return
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*/
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public static SharedPreferences.Editor putStringSet(final SharedPreferences.Editor editor,
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final String key,
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final Set<String> vals) {
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if (Versions.preHC) {
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final JSONArray json = new JSONArray(vals);
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editor.putString(key, json.toString());
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} else {
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editor.putStringSet(key, vals);
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}
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return editor;
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}
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}
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