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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.eclipse.jetty.websocket.core.internal.util</a></div>
<h2 title="Class InvokerUtils" class="title">Class InvokerUtils</h2>
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<li>java.lang.Object</li>
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<li>org.eclipse.jetty.websocket.core.internal.util.InvokerUtils</li>
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<pre>public class <span class="typeNameLabel">InvokerUtils</span>
extends java.lang.Object</pre>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="InvokerUtils.Arg.html" title="class in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.Arg</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="InvokerUtils.ParamIdentifier.html" title="interface in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.ParamIdentifier</a></span></code></th>
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<td class="colFirst"><code>static <a href="InvokerUtils.ParamIdentifier.html" title="interface in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.ParamIdentifier</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#PARAM_IDENTITY">PARAM_IDENTITY</a></span></code></th>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">InvokerUtils</a></span>()</code></th>
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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>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>static java.lang.invoke.MethodHandle</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#bindTo(java.lang.invoke.MethodHandle,java.lang.Object...)">bindTo</a></span>&#8203;(java.lang.invoke.MethodHandle&nbsp;methodHandle,
java.lang.Object...&nbsp;objs)</code></th>
<td class="colLast">
<div class="block">Bind optional arguments to provided method handle</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static java.lang.invoke.MethodHandle</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#mutatedInvoker(java.lang.invoke.MethodHandles.Lookup,java.lang.Class,java.lang.reflect.Method,org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.Arg...)">mutatedInvoker</a></span>&#8203;(java.lang.invoke.MethodHandles.Lookup&nbsp;lookup,
java.lang.Class&lt;?&gt;&nbsp;targetClass,
java.lang.reflect.Method&nbsp;method,
<a href="InvokerUtils.Arg.html" title="class in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.Arg</a>...&nbsp;callingArgs)</code></th>
<td class="colLast">
<div class="block">Build a MethodHandle that can call the method with the calling args provided.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static java.lang.invoke.MethodHandle</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#mutatedInvoker(java.lang.invoke.MethodHandles.Lookup,java.lang.Class,java.lang.reflect.Method,org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.ParamIdentifier,java.lang.String%5B%5D,org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.Arg...)">mutatedInvoker</a></span>&#8203;(java.lang.invoke.MethodHandles.Lookup&nbsp;lookup,
java.lang.Class&lt;?&gt;&nbsp;targetClass,
java.lang.reflect.Method&nbsp;method,
<a href="InvokerUtils.ParamIdentifier.html" title="interface in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.ParamIdentifier</a>&nbsp;paramIdentifier,
java.lang.String[]&nbsp;namedVariables,
<a href="InvokerUtils.Arg.html" title="class in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.Arg</a>...&nbsp;callingArgs)</code></th>
<td class="colLast">
<div class="block">Create a MethodHandle that performs the following layers
<code>MethodHandles.permuteArguments(MethodHandle, MethodType, int...)</code> - moving calling Args around
to fit actual actual method parameter arguments (in proper order), with remaining (unused) calling args afterwords
<code>MethodHandles.dropArguments(MethodHandle, int, Class[])</code> - to drop the unused calling args
<code>MethodHandle.invoke(Object...)</code> - to call the specific method
</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static java.lang.invoke.MethodHandle</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#optionalMutatedInvoker(java.lang.invoke.MethodHandles.Lookup,java.lang.Class,java.lang.reflect.Method,org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.Arg...)">optionalMutatedInvoker</a></span>&#8203;(java.lang.invoke.MethodHandles.Lookup&nbsp;lookup,
java.lang.Class&lt;?&gt;&nbsp;targetClass,
java.lang.reflect.Method&nbsp;method,
<a href="InvokerUtils.Arg.html" title="class in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.Arg</a>...&nbsp;callingArgs)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static java.lang.invoke.MethodHandle</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#optionalMutatedInvoker(java.lang.invoke.MethodHandles.Lookup,java.lang.Class,java.lang.reflect.Method,org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.ParamIdentifier,java.lang.String%5B%5D,org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.Arg...)">optionalMutatedInvoker</a></span>&#8203;(java.lang.invoke.MethodHandles.Lookup&nbsp;lookup,
java.lang.Class&lt;?&gt;&nbsp;targetClass,
java.lang.reflect.Method&nbsp;method,
<a href="InvokerUtils.ParamIdentifier.html" title="interface in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.ParamIdentifier</a>&nbsp;paramIdentifier,
java.lang.String[]&nbsp;namedVariables,
<a href="InvokerUtils.Arg.html" title="class in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.Arg</a>...&nbsp;callingArgs)</code></th>
<td class="colLast">
<div class="block">Create an optional MethodHandle that performs the following layers.</div>
</td>
</tr>
</table>
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</a>
<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
</ul>
</li>
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</section>
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<h4>PARAM_IDENTITY</h4>
<pre>public static final&nbsp;<a href="InvokerUtils.ParamIdentifier.html" title="interface in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.ParamIdentifier</a> PARAM_IDENTITY</pre>
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<h4>InvokerUtils</h4>
<pre>public&nbsp;InvokerUtils()</pre>
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<h4>bindTo</h4>
<pre class="methodSignature">public static&nbsp;java.lang.invoke.MethodHandle&nbsp;bindTo&#8203;(java.lang.invoke.MethodHandle&nbsp;methodHandle,
java.lang.Object...&nbsp;objs)</pre>
<div class="block">Bind optional arguments to provided method handle</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>methodHandle</code> - the method handle to bind to</dd>
<dd><code>objs</code> - the list of optional objects to bind to.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the bound MethodHandle, or null if the provided <code>methodHandle</code> was null.</dd>
</dl>
</li>
</ul>
<a id="mutatedInvoker(java.lang.invoke.MethodHandles.Lookup,java.lang.Class,java.lang.reflect.Method,org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.Arg...)">
<!-- -->
</a>
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<h4>mutatedInvoker</h4>
<pre class="methodSignature">public static&nbsp;java.lang.invoke.MethodHandle&nbsp;mutatedInvoker&#8203;(java.lang.invoke.MethodHandles.Lookup&nbsp;lookup,
java.lang.Class&lt;?&gt;&nbsp;targetClass,
java.lang.reflect.Method&nbsp;method,
<a href="InvokerUtils.Arg.html" title="class in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.Arg</a>...&nbsp;callingArgs)</pre>
<div class="block">Build a MethodHandle that can call the method with the calling args provided.
<p>
Might need to drop calling args and/or reorder the calling args to fit
the actual method being called.
</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>lookup</code> - the <code>MethodHandles.Lookup</code> instance to use.</dd>
<dd><code>targetClass</code> - the target class for invocations of the resulting MethodHandle (also known as parameter 0)</dd>
<dd><code>method</code> - the method to invoke</dd>
<dd><code>callingArgs</code> - the calling arguments. This is the array of arguments that will always be passed into the returned MethodHandle.
They will be present in the <code>MethodHandle.type()</code> in the order specified in this array.</dd>
</dl>
</li>
</ul>
<a id="mutatedInvoker(java.lang.invoke.MethodHandles.Lookup,java.lang.Class,java.lang.reflect.Method,org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.ParamIdentifier,java.lang.String[],org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.Arg...)">
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<h4>mutatedInvoker</h4>
<pre class="methodSignature">public static&nbsp;java.lang.invoke.MethodHandle&nbsp;mutatedInvoker&#8203;(java.lang.invoke.MethodHandles.Lookup&nbsp;lookup,
java.lang.Class&lt;?&gt;&nbsp;targetClass,
java.lang.reflect.Method&nbsp;method,
<a href="InvokerUtils.ParamIdentifier.html" title="interface in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.ParamIdentifier</a>&nbsp;paramIdentifier,
java.lang.String[]&nbsp;namedVariables,
<a href="InvokerUtils.Arg.html" title="class in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.Arg</a>...&nbsp;callingArgs)</pre>
<div class="block">Create a MethodHandle that performs the following layers
<ol>
<li><code>MethodHandles.permuteArguments(MethodHandle, MethodType, int...)</code> - moving calling Args around
to fit actual actual method parameter arguments (in proper order), with remaining (unused) calling args afterwords</li>
<li><code>MethodHandles.dropArguments(MethodHandle, int, Class[])</code> - to drop the unused calling args</li>
<li><code>MethodHandle.invoke(Object...)</code> - to call the specific method</li>
</ol>
<p>
The returned <code>MethodHandle</code>.<code>MethodHandle.type()</code> assumes the following:
</p>
<ol>
<li>Return type will be what the provided <code>Method</code> has.</li>
<li>The first parameter is the type of class provided in the <code>targetClass</code>.</li>
<li>The next parameters are all of the found type's of the named arguments, or type <code>String</code> if not found in provided <code>Method</code>.</li>
<li>The next parameters are all of the provided <code>callingArg</code> types</li>
</ol></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>lookup</code> - the <code>MethodHandles.Lookup</code> instance to use.</dd>
<dd><code>targetClass</code> - the target class for invocations of the resulting MethodHandle (also known as parameter 0)</dd>
<dd><code>method</code> - the method to invoke</dd>
<dd><code>paramIdentifier</code> - the mechanism to identify parameters in method</dd>
<dd><code>namedVariables</code> - the array of named variables. This is the array of named arguments that the target method might have.
The resulting MethodHandle will include all of these namedVariables as the first non-object arguments in the <code>MethodType</code>
found on the returned <code>MethodHandle.type()</code></dd>
<dd><code>callingArgs</code> - the calling arguments. This is the array of arguments that will always be passed into the returned MethodHandle.
They will be present in the <code>MethodHandle.type()</code> in the order specified in this array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the MethodHandle for this set of CallingArgs</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.RuntimeException</code> - when unable to fit Calling Args to Parameter Types</dd>
</dl>
</li>
</ul>
<a id="optionalMutatedInvoker(java.lang.invoke.MethodHandles.Lookup,java.lang.Class,java.lang.reflect.Method,org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.ParamIdentifier,java.lang.String[],org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.Arg...)">
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<h4>optionalMutatedInvoker</h4>
<pre class="methodSignature">public static&nbsp;java.lang.invoke.MethodHandle&nbsp;optionalMutatedInvoker&#8203;(java.lang.invoke.MethodHandles.Lookup&nbsp;lookup,
java.lang.Class&lt;?&gt;&nbsp;targetClass,
java.lang.reflect.Method&nbsp;method,
<a href="InvokerUtils.ParamIdentifier.html" title="interface in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.ParamIdentifier</a>&nbsp;paramIdentifier,
java.lang.String[]&nbsp;namedVariables,
<a href="InvokerUtils.Arg.html" title="class in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.Arg</a>...&nbsp;callingArgs)</pre>
<div class="block">Create an optional MethodHandle that performs the following layers.
<ol>
<li><code>MethodHandles.permuteArguments(MethodHandle, MethodType, int...)</code> - moving calling Args around
to fit actual actual method parameter arguments (in proper order), with remaining (unused) calling args afterwords</li>
<li><code>MethodHandles.dropArguments(MethodHandle, int, Class[])</code> - to drop the unused calling args</li>
<li><code>MethodHandle.invoke(Object...)</code> - to call the specific method</li>
</ol></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>lookup</code> - the <code>MethodHandles.Lookup</code> instance to use.</dd>
<dd><code>targetClass</code> - the target class for invocations of the resulting MethodHandle (also known as parameter 0)</dd>
<dd><code>method</code> - the method to invoke</dd>
<dd><code>paramIdentifier</code> - the mechanism to identify parameters in method</dd>
<dd><code>namedVariables</code> - the array of named variables. This is the array of named arguments that the target method might have.
The resulting MethodHandle will include all of these namedVariables as the first non-object arguments in the <code>MethodType</code>
found on the returned <code>MethodHandle.type()</code></dd>
<dd><code>callingArgs</code> - the calling arguments. This is the array of arguments that will always be passed into the returned MethodHandle.
They will be present in the <code>MethodHandle.type()</code> in the order specified in this array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the MethodHandle for this set of CallingArgs, or null if not possible to create MethodHandle with CallingArgs to provided method</dd>
</dl>
</li>
</ul>
<a id="optionalMutatedInvoker(java.lang.invoke.MethodHandles.Lookup,java.lang.Class,java.lang.reflect.Method,org.eclipse.jetty.websocket.core.internal.util.InvokerUtils.Arg...)">
<!-- -->
</a>
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<h4>optionalMutatedInvoker</h4>
<pre class="methodSignature">public static&nbsp;java.lang.invoke.MethodHandle&nbsp;optionalMutatedInvoker&#8203;(java.lang.invoke.MethodHandles.Lookup&nbsp;lookup,
java.lang.Class&lt;?&gt;&nbsp;targetClass,
java.lang.reflect.Method&nbsp;method,
<a href="InvokerUtils.Arg.html" title="class in org.eclipse.jetty.websocket.core.internal.util">InvokerUtils.Arg</a>...&nbsp;callingArgs)</pre>
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