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<!-- Generated by javadoc (21) on Tue May 12 14:36:52 UTC 2026 -->
<title>Multipart (flash-parent 2.1.0-SNAPSHOT API)</title>
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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">dev.relism.flash.api.multipart</a></div>
<h1 title="Class Multipart" class="title">Class Multipart</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">dev.relism.flash.api.multipart.Multipart</div>
</div>
<section class="class-description" id="class-description">
<hr>
<div class="type-signature"><span class="modifiers">public final class </span><span class="element-name type-name-label">Multipart</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div>
<div class="block">Lazy streaming <code>multipart/form-data</code> parser.
<p>Reads from <code>body.stream()</code> — the request body is <em>never</em> fully materialised.
Text fields are buffered eagerly on first encounter (they are small by definition). File part
bodies are exposed as zero-copy <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/InputStream.html" title="class or interface in java.io" class="external-link"><code>InputStream</code></a>s backed directly by the socket stream and
must be consumed before the next call to any scan method.
<pre><code>
Multipart mp = Multipart.of(req);
// Text fields — buffered eagerly, accessible in any call order
String userId = mp.field("userId");
String width = mp.field("width");
// File parts — zero-copy socket stream; consume before requesting the next file
Part avatar = mp.file("avatar");
Files.copy(avatar.stream(), destination);
// Explicit materialization of a file body (opt-in heap allocation)
byte[] data = mp.file("doc").materialize();
// Collect everything at once — eagerly buffers all bodies (accept the memory cost)
List&lt;Part&gt; files = mp.parts("files");
</code></pre>
<p><b>Scan ordering:</b> <a href="#field(java.lang.String)"><code>field(java.lang.String)</code></a> and <a href="#file(java.lang.String)"><code>file(java.lang.String)</code></a> scan forward through the stream.
Parts already passed cannot be re-read. Text fields encountered while scanning toward a file
are buffered silently; file bodies encountered while scanning toward a text field are drained
silently. Use <a href="#parts()"><code>parts()</code></a> only if you need everything and accept full materialisation.
<p><b>Thread safety:</b> not thread-safe; one instance per request.</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
<div id="method-summary-table.tabpanel" role="tabpanel" aria-labelledby="method-summary-table-tab0">
<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#field(java.lang.String)" class="member-name-link">field</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Returns the text value of the first field named <code>name</code>, or <code>null</code>.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="Part.html" title="class in dev.relism.flash.api.multipart">Part</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#file(java.lang.String)" class="member-name-link">file</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Returns the first file part named <code>name</code>, or <code>null</code>.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="Multipart.html" title="class in dev.relism.flash.api.multipart">Multipart</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#of(dev.relism.flash.models.Request)" class="member-name-link">of</a><wbr>(<a href="../../models/Request.html" title="class in dev.relism.flash.models">Request</a>&nbsp;req)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Creates a parser for <code>request</code>.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><wbr>&lt;<a href="Part.html" title="class in dev.relism.flash.api.multipart">Part</a>&gt;</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#parts()" class="member-name-link">parts</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Returns all parts in declaration order.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><wbr>&lt;<a href="Part.html" title="class in dev.relism.flash.api.multipart">Part</a>&gt;</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#parts(java.lang.String)" class="member-name-link">parts</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Returns all parts named <code>name</code> in declaration order.</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ============ METHOD DETAIL ========== -->
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<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="of(dev.relism.flash.models.Request)">
<h3>of</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="Multipart.html" title="class in dev.relism.flash.api.multipart">Multipart</a></span>&nbsp;<span class="element-name">of</span><wbr><span class="parameters">(<a href="../../models/Request.html" title="class in dev.relism.flash.models">Request</a>&nbsp;req)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block">Creates a parser for <code>request</code>. Uses <code>body.stream()</code> — zero heap allocation.</div>
<dl class="notes">
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if the request is not multipart or boundary is missing</dd>
<dd><code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code> - if the initial stream read fails</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="field(java.lang.String)">
<h3>field</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name">field</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block">Returns the text value of the first field named <code>name</code>, or <code>null</code>.
Scans forward; text parts encountered along the way are buffered, file bodies are drained.</div>
<dl class="notes">
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="file(java.lang.String)">
<h3>file</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="Part.html" title="class in dev.relism.flash.api.multipart">Part</a></span>&nbsp;<span class="element-name">file</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block">Returns the first file part named <code>name</code>, or <code>null</code>.
Scans forward; text parts encountered along the way are buffered, earlier file bodies
are drained. The returned part's stream must be consumed before the next scan call.</div>
<dl class="notes">
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="parts(java.lang.String)">
<h3>parts</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="Part.html" title="class in dev.relism.flash.api.multipart">Part</a>&gt;</span>&nbsp;<span class="element-name">parts</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;name)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block">Returns all parts named <code>name</code> in declaration order.
Forces a full scan; all file bodies are materialised into heap.</div>
<dl class="notes">
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="parts()">
<h3>parts</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="Part.html" title="class in dev.relism.flash.api.multipart">Part</a>&gt;</span>&nbsp;<span class="element-name">parts</span>()
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block">Returns all parts in declaration order.
Forces a full scan; all file bodies are materialised into heap.</div>
<dl class="notes">
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
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