| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * 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 android.os; |
| |
| import java.util.ArrayList; |
| |
| |
| /** |
| * Gives access to the system properties store. The system properties |
| * store contains a list of string key-value pairs. |
| * |
| * {@hide} |
| */ |
| public class SystemProperties |
| { |
| public static final int PROP_NAME_MAX = 31; |
| public static final int PROP_VALUE_MAX = 91; |
| |
| private static final ArrayList<Runnable> sChangeCallbacks = new ArrayList<Runnable>(); |
| |
| private static native String native_get(String key); |
| private static native String native_get(String key, String def); |
| private static native int native_get_int(String key, int def); |
| private static native long native_get_long(String key, long def); |
| private static native boolean native_get_boolean(String key, boolean def); |
| private static native void native_set(String key, String def); |
| private static native void native_add_change_callback(); |
| |
| /** |
| * Get the value for the given key. |
| * @return an empty string if the key isn't found |
| * @throws IllegalArgumentException if the key exceeds 32 characters |
| */ |
| public static String get(String key) { |
| if (key.length() > PROP_NAME_MAX) { |
| throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX); |
| } |
| return native_get(key); |
| } |
| |
| /** |
| * Get the value for the given key. |
| * @return if the key isn't found, return def if it isn't null, or an empty string otherwise |
| * @throws IllegalArgumentException if the key exceeds 32 characters |
| */ |
| public static String get(String key, String def) { |
| if (key.length() > PROP_NAME_MAX) { |
| throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX); |
| } |
| return native_get(key, def); |
| } |
| |
| /** |
| * Get the value for the given key, and return as an integer. |
| * @param key the key to lookup |
| * @param def a default value to return |
| * @return the key parsed as an integer, or def if the key isn't found or |
| * cannot be parsed |
| * @throws IllegalArgumentException if the key exceeds 32 characters |
| */ |
| public static int getInt(String key, int def) { |
| if (key.length() > PROP_NAME_MAX) { |
| throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX); |
| } |
| return native_get_int(key, def); |
| } |
| |
| /** |
| * Get the value for the given key, and return as a long. |
| * @param key the key to lookup |
| * @param def a default value to return |
| * @return the key parsed as a long, or def if the key isn't found or |
| * cannot be parsed |
| * @throws IllegalArgumentException if the key exceeds 32 characters |
| */ |
| public static long getLong(String key, long def) { |
| if (key.length() > PROP_NAME_MAX) { |
| throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX); |
| } |
| return native_get_long(key, def); |
| } |
| |
| /** |
| * Get the value for the given key, returned as a boolean. |
| * Values 'n', 'no', '0', 'false' or 'off' are considered false. |
| * Values 'y', 'yes', '1', 'true' or 'on' are considered true. |
| * (case sensitive). |
| * If the key does not exist, or has any other value, then the default |
| * result is returned. |
| * @param key the key to lookup |
| * @param def a default value to return |
| * @return the key parsed as a boolean, or def if the key isn't found or is |
| * not able to be parsed as a boolean. |
| * @throws IllegalArgumentException if the key exceeds 32 characters |
| */ |
| public static boolean getBoolean(String key, boolean def) { |
| if (key.length() > PROP_NAME_MAX) { |
| throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX); |
| } |
| return native_get_boolean(key, def); |
| } |
| |
| /** |
| * Set the value for the given key. |
| * @throws IllegalArgumentException if the key exceeds 32 characters |
| * @throws IllegalArgumentException if the value exceeds 92 characters |
| */ |
| public static void set(String key, String val) { |
| if (key.length() > PROP_NAME_MAX) { |
| throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX); |
| } |
| if (val != null && val.length() > PROP_VALUE_MAX) { |
| throw new IllegalArgumentException("val.length > " + |
| PROP_VALUE_MAX); |
| } |
| native_set(key, val); |
| } |
| |
| public static void addChangeCallback(Runnable callback) { |
| synchronized (sChangeCallbacks) { |
| if (sChangeCallbacks.size() == 0) { |
| native_add_change_callback(); |
| } |
| sChangeCallbacks.add(callback); |
| } |
| } |
| |
| static void callChangeCallbacks() { |
| synchronized (sChangeCallbacks) { |
| //Log.i("foo", "Calling " + sChangeCallbacks.size() + " change callbacks!"); |
| if (sChangeCallbacks.size() == 0) { |
| return; |
| } |
| ArrayList<Runnable> callbacks = new ArrayList<Runnable>(sChangeCallbacks); |
| for (int i=0; i<callbacks.size(); i++) { |
| callbacks.get(i).run(); |
| } |
| } |
| } |
| } |