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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 org.mozilla.thirdparty.com.google.android.exoplayer2.util;
import android.os.Looper;
import android.text.TextUtils;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.ExoPlayerLibraryInfo;
import org.checkerframework.checker.nullness.qual.EnsuresNonNull;
/**
* Provides methods for asserting the truth of expressions and properties.
*/
public final class Assertions {
private Assertions() {}
/**
* Throws {@link IllegalArgumentException} if {@code expression} evaluates to false.
*
* @param expression The expression to evaluate.
* @throws IllegalArgumentException If {@code expression} is false.
*/
public static void checkArgument(boolean expression) {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && !expression) {
throw new IllegalArgumentException();
}
}
/**
* Throws {@link IllegalArgumentException} if {@code expression} evaluates to false.
*
* @param expression The expression to evaluate.
* @param errorMessage The exception message if an exception is thrown. The message is converted
* to a {@link String} using {@link String#valueOf(Object)}.
* @throws IllegalArgumentException If {@code expression} is false.
*/
public static void checkArgument(boolean expression, Object errorMessage) {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && !expression) {
throw new IllegalArgumentException(String.valueOf(errorMessage));
}
}
/**
* Throws {@link IndexOutOfBoundsException} if {@code index} falls outside the specified bounds.
*
* @param index The index to test.
* @param start The start of the allowed range (inclusive).
* @param limit The end of the allowed range (exclusive).
* @return The {@code index} that was validated.
* @throws IndexOutOfBoundsException If {@code index} falls outside the specified bounds.
*/
public static int checkIndex(int index, int start, int limit) {
if (index < start || index >= limit) {
throw new IndexOutOfBoundsException();
}
return index;
}
/**
* Throws {@link IllegalStateException} if {@code expression} evaluates to false.
*
* @param expression The expression to evaluate.
* @throws IllegalStateException If {@code expression} is false.
*/
public static void checkState(boolean expression) {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && !expression) {
throw new IllegalStateException();
}
}
/**
* Throws {@link IllegalStateException} if {@code expression} evaluates to false.
*
* @param expression The expression to evaluate.
* @param errorMessage The exception message if an exception is thrown. The message is converted
* to a {@link String} using {@link String#valueOf(Object)}.
* @throws IllegalStateException If {@code expression} is false.
*/
public static void checkState(boolean expression, Object errorMessage) {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && !expression) {
throw new IllegalStateException(String.valueOf(errorMessage));
}
}
/**
* Throws {@link IllegalStateException} if {@code reference} is null.
*
* @param <T> The type of the reference.
* @param reference The reference.
* @return The non-null reference that was validated.
* @throws IllegalStateException If {@code reference} is null.
*/
@SuppressWarnings({"contracts.postcondition.not.satisfied", "return.type.incompatible"})
@EnsuresNonNull({"#1"})
public static <T> T checkStateNotNull(@Nullable T reference) {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && reference == null) {
throw new IllegalStateException();
}
return reference;
}
/**
* Throws {@link IllegalStateException} if {@code reference} is null.
*
* @param <T> The type of the reference.
* @param reference The reference.
* @param errorMessage The exception message to use if the check fails. The message is converted
* to a string using {@link String#valueOf(Object)}.
* @return The non-null reference that was validated.
* @throws IllegalStateException If {@code reference} is null.
*/
@SuppressWarnings({"contracts.postcondition.not.satisfied", "return.type.incompatible"})
@EnsuresNonNull({"#1"})
public static <T> T checkStateNotNull(@Nullable T reference, Object errorMessage) {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && reference == null) {
throw new IllegalStateException(String.valueOf(errorMessage));
}
return reference;
}
/**
* Throws {@link NullPointerException} if {@code reference} is null.
*
* @param <T> The type of the reference.
* @param reference The reference.
* @return The non-null reference that was validated.
* @throws NullPointerException If {@code reference} is null.
*/
@SuppressWarnings({"contracts.postcondition.not.satisfied", "return.type.incompatible"})
@EnsuresNonNull({"#1"})
public static <T> T checkNotNull(@Nullable T reference) {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && reference == null) {
throw new NullPointerException();
}
return reference;
}
/**
* Throws {@link NullPointerException} if {@code reference} is null.
*
* @param <T> The type of the reference.
* @param reference The reference.
* @param errorMessage The exception message to use if the check fails. The message is converted
* to a string using {@link String#valueOf(Object)}.
* @return The non-null reference that was validated.
* @throws NullPointerException If {@code reference} is null.
*/
@SuppressWarnings({"contracts.postcondition.not.satisfied", "return.type.incompatible"})
@EnsuresNonNull({"#1"})
public static <T> T checkNotNull(@Nullable T reference, Object errorMessage) {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && reference == null) {
throw new NullPointerException(String.valueOf(errorMessage));
}
return reference;
}
/**
* Throws {@link IllegalArgumentException} if {@code string} is null or zero length.
*
* @param string The string to check.
* @return The non-null, non-empty string that was validated.
* @throws IllegalArgumentException If {@code string} is null or 0-length.
*/
@SuppressWarnings({"contracts.postcondition.not.satisfied", "return.type.incompatible"})
@EnsuresNonNull({"#1"})
public static String checkNotEmpty(@Nullable String string) {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && TextUtils.isEmpty(string)) {
throw new IllegalArgumentException();
}
return string;
}
/**
* Throws {@link IllegalArgumentException} if {@code string} is null or zero length.
*
* @param string The string to check.
* @param errorMessage The exception message to use if the check fails. The message is converted
* to a string using {@link String#valueOf(Object)}.
* @return The non-null, non-empty string that was validated.
* @throws IllegalArgumentException If {@code string} is null or 0-length.
*/
@SuppressWarnings({"contracts.postcondition.not.satisfied", "return.type.incompatible"})
@EnsuresNonNull({"#1"})
public static String checkNotEmpty(@Nullable String string, Object errorMessage) {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && TextUtils.isEmpty(string)) {
throw new IllegalArgumentException(String.valueOf(errorMessage));
}
return string;
}
/**
* Throws {@link IllegalStateException} if the calling thread is not the application's main
* thread.
*
* @throws IllegalStateException If the calling thread is not the application's main thread.
*/
public static void checkMainThread() {
if (ExoPlayerLibraryInfo.ASSERTIONS_ENABLED && Looper.myLooper() != Looper.getMainLooper()) {
throw new IllegalStateException("Not in applications main thread");
}
}
}
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