/* * 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;/** * 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 native String native_get(String key);    private static native String native_get(String key, String def);    private static native void native_set(String key, String def);    /**     * 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) {        try {            return Integer.parseInt(get(key));        } catch (NumberFormatException e) {            return 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) {        try {            return Long.parseLong(get(key));        } catch (NumberFormatException e) {            return 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 insensitive).     * 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) {        String value = get(key);        // Deal with these quick cases first: not found, 0 and 1        if (value.equals("")) {            return def;        } else if (value.equals("0")) {            return false;        } else if (value.equals("1")) {            return true;        // now for slower (and hopefully less common) cases        } else if (value.equalsIgnoreCase("n") ||                   value.equalsIgnoreCase("no") ||                   value.equalsIgnoreCase("false") ||                   value.equalsIgnoreCase("off")) {            return false;        } else if (value.equalsIgnoreCase("y") ||                   value.equalsIgnoreCase("yes") ||                   value.equalsIgnoreCase("true") ||                   value.equalsIgnoreCase("on")) {            return true;        }        return 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);    }}