128 lines
4.7 KiB
Java
128 lines
4.7 KiB
Java
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.os;
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/**
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* Gives access to the system properties store. The system properties
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* store contains a list of string key-value pairs.
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*
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* {@hide}
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*/
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public class SystemProperties
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{
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public static final int PROP_NAME_MAX = 31;
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public static final int PROP_VALUE_MAX = 91;
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private static native String native_get(String key);
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private static native String native_get(String key, String def);
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private static native int native_get_int(String key, int def);
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private static native long native_get_long(String key, long def);
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private static native boolean native_get_boolean(String key, boolean def);
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private static native void native_set(String key, String def);
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/**
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* Get the value for the given key.
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* @return an empty string if the key isn't found
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* @throws IllegalArgumentException if the key exceeds 32 characters
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*/
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public static String get(String key) {
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if (key.length() > PROP_NAME_MAX) {
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throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX);
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}
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return native_get(key);
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}
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/**
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* Get the value for the given key.
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* @return if the key isn't found, return def if it isn't null, or an empty string otherwise
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* @throws IllegalArgumentException if the key exceeds 32 characters
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*/
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public static String get(String key, String def) {
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if (key.length() > PROP_NAME_MAX) {
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throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX);
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}
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return native_get(key, def);
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}
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/**
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* Get the value for the given key, and return as an integer.
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* @param key the key to lookup
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* @param def a default value to return
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* @return the key parsed as an integer, or def if the key isn't found or
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* cannot be parsed
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* @throws IllegalArgumentException if the key exceeds 32 characters
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*/
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public static int getInt(String key, int def) {
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if (key.length() > PROP_NAME_MAX) {
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throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX);
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}
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return native_get_int(key, def);
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}
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/**
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* Get the value for the given key, and return as a long.
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* @param key the key to lookup
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* @param def a default value to return
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* @return the key parsed as a long, or def if the key isn't found or
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* cannot be parsed
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* @throws IllegalArgumentException if the key exceeds 32 characters
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*/
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public static long getLong(String key, long def) {
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if (key.length() > PROP_NAME_MAX) {
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throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX);
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}
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return native_get_long(key, def);
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}
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/**
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* Get the value for the given key, returned as a boolean.
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* Values 'n', 'no', '0', 'false' or 'off' are considered false.
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* Values 'y', 'yes', '1', 'true' or 'on' are considered true.
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* (case insensitive).
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* If the key does not exist, or has any other value, then the default
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* result is returned.
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* @param key the key to lookup
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* @param def a default value to return
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* @return the key parsed as a boolean, or def if the key isn't found or is
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* not able to be parsed as a boolean.
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* @throws IllegalArgumentException if the key exceeds 32 characters
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*/
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public static boolean getBoolean(String key, boolean def) {
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if (key.length() > PROP_NAME_MAX) {
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throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX);
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}
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return native_get_boolean(key, def);
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}
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/**
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* Set the value for the given key.
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* @throws IllegalArgumentException if the key exceeds 32 characters
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* @throws IllegalArgumentException if the value exceeds 92 characters
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*/
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public static void set(String key, String val) {
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if (key.length() > PROP_NAME_MAX) {
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throw new IllegalArgumentException("key.length > " + PROP_NAME_MAX);
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}
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if (val != null && val.length() > PROP_VALUE_MAX) {
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throw new IllegalArgumentException("val.length > " +
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PROP_VALUE_MAX);
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}
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native_set(key, val);
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}
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}
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