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/*
* Copyright (C) 2016 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.dialer.common;
import android.os.Looper;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import javax.annotation.CheckReturnValue;
/** Assertions which will result in program termination unless disabled by flags. */
public class Assert {
private static boolean areThreadAssertsEnabled = true;
public static void setAreThreadAssertsEnabled(boolean areThreadAssertsEnabled) {
Assert.areThreadAssertsEnabled = areThreadAssertsEnabled;
}
public static boolean areThreadAssertsEnabled() {
return areThreadAssertsEnabled;
}
/**
* Called when a truly exceptional case occurs.
*
* @throws AssertionError
* @deprecated Use throw Assert.create*FailException() instead.
*/
@Deprecated
public static void fail() {
throw new AssertionError("Fail");
}
/**
* Called when a truly exceptional case occurs.
*
* @param reason the optional reason to supply as the exception message
* @throws AssertionError
* @deprecated Use throw Assert.create*FailException() instead.
*/
@Deprecated
public static void fail(String reason) {
throw new AssertionError(reason);
}
@CheckReturnValue
public static AssertionError createAssertionFailException(String msg) {
return new AssertionError(msg);
}
@CheckReturnValue
public static UnsupportedOperationException createUnsupportedOperationFailException() {
return new UnsupportedOperationException();
}
@CheckReturnValue
public static UnsupportedOperationException createUnsupportedOperationFailException(String msg) {
return new UnsupportedOperationException(msg);
}
@CheckReturnValue
public static IllegalStateException createIllegalStateFailException() {
return new IllegalStateException();
}
@CheckReturnValue
public static IllegalStateException createIllegalStateFailException(String msg) {
return new IllegalStateException(msg);
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
* @param expression a boolean expression
* @throws IllegalArgumentException if {@code expression} is false
*/
public static void checkArgument(boolean expression) {
checkArgument(expression, null);
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
* @param expression a boolean expression
* @param messageTemplate the message to log, possible with format arguments.
* @param args optional arguments to be used in the formatted string.
* @throws IllegalArgumentException if {@code expression} is false
*/
public static void checkArgument(
boolean expression, @Nullable String messageTemplate, Object... args) {
if (!expression) {
throw new IllegalArgumentException(format(messageTemplate, args));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
* @param expression a boolean expression
* @throws IllegalStateException if {@code expression} is false
*/
public static void checkState(boolean expression) {
checkState(expression, null);
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
* @param expression a boolean expression
* @param messageTemplate the message to log, possible with format arguments.
* @param args optional arguments to be used in the formatted string.
* @throws IllegalStateException if {@code expression} is false
*/
public static void checkState(
boolean expression, @Nullable String messageTemplate, Object... args) {
if (!expression) {
throw new IllegalStateException(format(messageTemplate, args));
}
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* @param reference an object reference
* @return the non-null reference that was validated
* @throws NullPointerException if {@code reference} is null
*/
@NonNull
public static <T> T isNotNull(@Nullable T reference) {
return isNotNull(reference, null);
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* @param reference an object reference
* @param messageTemplate the message to log, possible with format arguments.
* @param args optional arguments to be used in the formatted string.
* @return the non-null reference that was validated
* @throws NullPointerException if {@code reference} is null
*/
@NonNull
public static <T> T isNotNull(
@Nullable T reference, @Nullable String messageTemplate, Object... args) {
if (reference == null) {
throw new NullPointerException(format(messageTemplate, args));
}
return reference;
}
/**
* Ensures that the current thread is the main thread.
*
* @throws IllegalStateException if called on a background thread
*/
public static void isMainThread() {
isMainThread(null);
}
/**
* Ensures that the current thread is the main thread.
*
* @param messageTemplate the message to log, possible with format arguments.
* @param args optional arguments to be used in the formatted string.
* @throws IllegalStateException if called on a background thread
*/
public static void isMainThread(@Nullable String messageTemplate, Object... args) {
if (!areThreadAssertsEnabled) {
return;
}
checkState(Looper.getMainLooper().equals(Looper.myLooper()), messageTemplate, args);
}
/**
* Ensures that the current thread is a worker thread.
*
* @throws IllegalStateException if called on the main thread
*/
public static void isWorkerThread() {
isWorkerThread(null);
}
/**
* Ensures that the current thread is a worker thread.
*
* @param messageTemplate the message to log, possible with format arguments.
* @param args optional arguments to be used in the formatted string.
* @throws IllegalStateException if called on the main thread
*/
public static void isWorkerThread(@Nullable String messageTemplate, Object... args) {
if (!areThreadAssertsEnabled) {
return;
}
checkState(!Looper.getMainLooper().equals(Looper.myLooper()), messageTemplate, args);
}
private static String format(@Nullable String messageTemplate, Object... args) {
if (messageTemplate == null) {
return null;
}
return String.format(messageTemplate, args);
}
}
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