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<h2 title="Class Assertions" class="title">Class Assertions</h2>
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<pre>public final class <span class="typeNameLabel">Assertions</span>
extends <a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a></pre>
<div class="block">Provides methods for asserting the truth of expressions and properties.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>static void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer2/util/Assertions.html#checkArgument-boolean-">checkArgument</a></span>&#8203;(boolean&nbsp;expression)</code></th>
<td class="colLast">
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalArgumentException</code></a> if <code>expression</code> evaluates to false.</div>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer2/util/Assertions.html#checkArgument-boolean-java.lang.Object-">checkArgument</a></span>&#8203;(boolean&nbsp;expression,
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<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalArgumentException</code></a> if <code>expression</code> evaluates to false.</div>
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<td class="colLast">
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IndexOutOfBoundsException</code></a> if <code>index</code> falls outside the specified bounds.</div>
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<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalStateException</code></a> if the calling thread is not the application's main
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<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalArgumentException</code></a> if <code>string</code> is null or zero length.</div>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;T</code></td>
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<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/NullPointerException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>NullPointerException</code></a> if <code>reference</code> is null.</div>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;T</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer2/util/Assertions.html#checkNotNull-T-java.lang.Object-">checkNotNull</a></span>&#8203;(T&nbsp;reference,
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<td class="colFirst"><code>static void</code></td>
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<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalStateException</code></a> if <code>expression</code> evaluates to false.</div>
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast">
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalStateException</code></a> if <code>expression</code> evaluates to false.</div>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;T</code></td>
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<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalStateException</code></a> if <code>reference</code> is null.</div>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;T</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../../com/google/android/exoplayer2/util/Assertions.html#checkStateNotNull-T-java.lang.Object-">checkStateNotNull</a></span>&#8203;(T&nbsp;reference,
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<td class="colLast">
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalStateException</code></a> if <code>reference</code> is null.</div>
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<h4>checkArgument</h4>
<pre>@Pure
public static&nbsp;void&nbsp;checkArgument&#8203;(boolean&nbsp;expression)</pre>
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalArgumentException</code></a> if <code>expression</code> evaluates to false.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>expression</code> - The expression to evaluate.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top">IllegalArgumentException</a></code> - If <code>expression</code> is false.</dd>
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<pre>@Pure
public static&nbsp;void&nbsp;checkArgument&#8203;(boolean&nbsp;expression,
<a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a>&nbsp;errorMessage)</pre>
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalArgumentException</code></a> if <code>expression</code> evaluates to false.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>expression</code> - The expression to evaluate.</dd>
<dd><code>errorMessage</code> - The exception message if an exception is thrown. The message is converted
to a <a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink"><code>String</code></a> using <a href="https://developer.android.com/reference/java/lang/String.html?is-external=true#valueOf-java.lang.Object-" title="class or interface in java.lang" class="externalLink" target="_top"><code>String.valueOf(Object)</code></a>.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top">IllegalArgumentException</a></code> - If <code>expression</code> is false.</dd>
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<pre>@Pure
public static&nbsp;int&nbsp;checkIndex&#8203;(int&nbsp;index,
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<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IndexOutOfBoundsException</code></a> if <code>index</code> falls outside the specified bounds.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>index</code> - The index to test.</dd>
<dd><code>start</code> - The start of the allowed range (inclusive).</dd>
<dd><code>limit</code> - The end of the allowed range (exclusive).</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The <code>index</code> that was validated.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang" class="externalLink" target="_top">IndexOutOfBoundsException</a></code> - If <code>index</code> falls outside the specified bounds.</dd>
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<pre>@Pure
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<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>expression</code> - The expression to evaluate.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top">IllegalStateException</a></code> - If <code>expression</code> is false.</dd>
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<pre>@Pure
public static&nbsp;void&nbsp;checkState&#8203;(boolean&nbsp;expression,
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<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalStateException</code></a> if <code>expression</code> evaluates to false.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>expression</code> - The expression to evaluate.</dd>
<dd><code>errorMessage</code> - The exception message if an exception is thrown. The message is converted
to a <a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink"><code>String</code></a> using <a href="https://developer.android.com/reference/java/lang/String.html?is-external=true#valueOf-java.lang.Object-" title="class or interface in java.lang" class="externalLink" target="_top"><code>String.valueOf(Object)</code></a>.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top">IllegalStateException</a></code> - If <code>expression</code> is false.</dd>
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<pre>@EnsuresNonNull("#1")
@Pure
public static&nbsp;&lt;T&gt;&nbsp;T&nbsp;checkStateNotNull&#8203;(@Nullable
T&nbsp;reference)</pre>
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalStateException</code></a> if <code>reference</code> is null.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - The type of the reference.</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>reference</code> - The reference.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The non-null reference that was validated.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top">IllegalStateException</a></code> - If <code>reference</code> is null.</dd>
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</li>
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<pre>@EnsuresNonNull("#1")
@Pure
public static&nbsp;&lt;T&gt;&nbsp;T&nbsp;checkStateNotNull&#8203;(@Nullable
T&nbsp;reference,
<a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a>&nbsp;errorMessage)</pre>
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalStateException</code></a> if <code>reference</code> is null.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - The type of the reference.</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>reference</code> - The reference.</dd>
<dd><code>errorMessage</code> - The exception message to use if the check fails. The message is converted
to a string using <a href="https://developer.android.com/reference/java/lang/String.html#valueOf-java.lang.Object-" title="class or interface in java.lang" class="externalLink" target="_top"><code>String.valueOf(Object)</code></a>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The non-null reference that was validated.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top">IllegalStateException</a></code> - If <code>reference</code> is null.</dd>
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<pre>@EnsuresNonNull("#1")
@Pure
public static&nbsp;&lt;T&gt;&nbsp;T&nbsp;checkNotNull&#8203;(@Nullable
T&nbsp;reference)</pre>
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/NullPointerException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>NullPointerException</code></a> if <code>reference</code> is null.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - The type of the reference.</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>reference</code> - The reference.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The non-null reference that was validated.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/NullPointerException.html" title="class or interface in java.lang" class="externalLink" target="_top">NullPointerException</a></code> - If <code>reference</code> is null.</dd>
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<pre>@EnsuresNonNull("#1")
@Pure
public static&nbsp;&lt;T&gt;&nbsp;T&nbsp;checkNotNull&#8203;(@Nullable
T&nbsp;reference,
<a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a>&nbsp;errorMessage)</pre>
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/NullPointerException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>NullPointerException</code></a> if <code>reference</code> is null.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - The type of the reference.</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>reference</code> - The reference.</dd>
<dd><code>errorMessage</code> - The exception message to use if the check fails. The message is converted
to a string using <a href="https://developer.android.com/reference/java/lang/String.html#valueOf-java.lang.Object-" title="class or interface in java.lang" class="externalLink" target="_top"><code>String.valueOf(Object)</code></a>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The non-null reference that was validated.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/NullPointerException.html" title="class or interface in java.lang" class="externalLink" target="_top">NullPointerException</a></code> - If <code>reference</code> is null.</dd>
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<pre>@EnsuresNonNull("#1")
@Pure
public static&nbsp;<a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink" target="_top">String</a>&nbsp;checkNotEmpty&#8203;(@Nullable
<a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink" target="_top">String</a>&nbsp;string)</pre>
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalArgumentException</code></a> if <code>string</code> is null or zero length.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>string</code> - The string to check.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The non-null, non-empty string that was validated.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top">IllegalArgumentException</a></code> - If <code>string</code> is null or 0-length.</dd>
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<pre>@EnsuresNonNull("#1")
@Pure
public static&nbsp;<a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink" target="_top">String</a>&nbsp;checkNotEmpty&#8203;(@Nullable
<a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink" target="_top">String</a>&nbsp;string,
<a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a>&nbsp;errorMessage)</pre>
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalArgumentException</code></a> if <code>string</code> is null or zero length.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>string</code> - The string to check.</dd>
<dd><code>errorMessage</code> - The exception message to use if the check fails. The message is converted
to a string using <a href="https://developer.android.com/reference/java/lang/String.html#valueOf-java.lang.Object-" title="class or interface in java.lang" class="externalLink" target="_top"><code>String.valueOf(Object)</code></a>.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The non-null, non-empty string that was validated.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="externalLink" target="_top">IllegalArgumentException</a></code> - If <code>string</code> is null or 0-length.</dd>
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<pre>@Pure
public static&nbsp;void&nbsp;checkMainThread()</pre>
<div class="block">Throws <a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top"><code>IllegalStateException</code></a> if the calling thread is not the application's main
thread.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://developer.android.com/reference/java/lang/IllegalStateException.html" title="class or interface in java.lang" class="externalLink" target="_top">IllegalStateException</a></code> - If the calling thread is not the application's main thread.</dd>
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