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/*
* Copyright (C) 2015 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 com.android.tv.common;
import android.util.Log;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
/**
* Lazy loaded boolean system property.
*
* <p>Set with <code>adb shell setprop <em>key</em> <em>value</em></code> where: Values 'n', 'no',
* '0', 'false' or 'off' are considered false. Values 'y', 'yes', '1', 'true' or 'on' are considered
* true. (case sensitive). See <a href=
* "https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/os/SystemProperties.java"
* >android.os.SystemProperties.getBoolean</a>.
*/
public class BooleanSystemProperty {
private static final String TAG = "BooleanSystemProperty";
private static final boolean DEBUG = false;
private static final List<BooleanSystemProperty> ALL_PROPERTIES = new ArrayList<>();
private final boolean mDefaultValue;
private final String mKey;
private Boolean mValue = null;
/**
* Create a boolean system property.
*
* @param key the system property key.
* @param defaultValue the value to return if the property is undefined or empty.
*/
public BooleanSystemProperty(String key, boolean defaultValue) {
mDefaultValue = defaultValue;
mKey = key;
ALL_PROPERTIES.add(this);
}
public static void resetAll() {
for (BooleanSystemProperty prop : ALL_PROPERTIES) {
prop.reset();
}
}
/**
* Gets system properties set by <code>adb shell setprop <em>key</em> <em>value</em></code>
*
* @param key the property key.
* @param defaultValue the value to return if the property is undefined or empty.
* @return the system property value or the default value.
*/
private static boolean getBoolean(String key, boolean defaultValue) {
try {
final Class<?> systemProperties = Class.forName("android.os.SystemProperties");
final Method get = systemProperties.getMethod("getBoolean", String.class, Boolean.TYPE);
return (boolean) get.invoke(null, key, defaultValue);
} catch (Exception e) {
Log.e(TAG, "Error getting boolean for " + key, e);
// This should never happen
return defaultValue;
}
}
/**
* Clears the cached value. The next call to getValue will check {@code
* android.os.SystemProperties}.
*/
public void reset() {
mValue = null;
}
/**
* Returns the value of the system property.
*
* <p>If the value is cached get the value from {@code android.os.SystemProperties} with the
* default set in the constructor.
*/
public boolean getValue() {
if (mValue == null) {
mValue = getBoolean(mKey, mDefaultValue);
if (DEBUG) Log.d(TAG, mKey + "=" + mValue);
}
return mValue;
}
@Override
public String toString() {
return "SystemProperty[" + mKey + "]=" + getValue();
}
}
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