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<meta charset="utf-8">
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<h4>In this document</h4>
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<ul class="card-body">
<li class="level-1"><a href="#directorynode">DirectoryNode</a></li>
<li class="level-2"><a href="#example-directorynode-json">Example DirectoryNode JSON</a></li>
<li class="level-2"><a href="#directorynode-fields">DirectoryNode Fields</a></li>
<li class="level-2"><a href="#directory-id-formats">Directory ID Formats</a></li>
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<h1 id="directorynode">DirectoryNode</h1>
<p><a class="external-link" href="https://github.com/ripple/rippled/blob/5d2d88209f1732a0f8d592012094e345cbe3e675/src/ripple/protocol/impl/LedgerFormats.cpp#L44" target="_blank" title="Source">[Source] <i aria-hidden="true" class="fa fa-external-link"></i></a></p>
<p>The <code>DirectoryNode</code> object type provides a list of links to other objects in the ledger's state tree. A single conceptual <em>Directory</em> takes the form of a doubly linked list, with one or more DirectoryNode objects each containing up to 32 <a href="ledgers.html#tree-format">IDs</a> of other objects. The first object is called the root of the directory, and all objects other than the root object can be added or deleted as necessary.</p>
<p>There are two kinds of Directories:</p>
<ul>
<li><strong>Owner directories</strong> list other objects owned by an account, such as <code>RippleState</code> or <code>Offer</code> objects.</li>
<li><strong>Offer directories</strong> list the offers available in the distributed exchange. A single Offer directory contains all the offers that have the same exchange rate for the same issuances.</li>
</ul>
<h2 id="example-directorynode-json">Example DirectoryNode JSON</h2>
<div class="multicode" id="code-0"><ul class="codetabs"><li><a href="#code-0-0">Offer Directory</a></li><li><a href="#code-0-1">Owner Directory</a></li></ul>
<div class="code_sample" id="code-0-0" style="position: static;"><pre><code class="json">{
"ExchangeRate": "4F069BA8FF484000",
"Flags": 0,
"Indexes": [
"AD7EAE148287EF12D213A251015F86E6D4BD34B3C4A0A1ED9A17198373F908AD"
],
"LedgerEntryType": "DirectoryNode",
"RootIndex": "1BBEF97EDE88D40CEE2ADE6FEF121166AFE80D99EBADB01A4F069BA8FF484000",
"TakerGetsCurrency": "0000000000000000000000000000000000000000",
"TakerGetsIssuer": "0000000000000000000000000000000000000000",
"TakerPaysCurrency": "0000000000000000000000004A50590000000000",
"TakerPaysIssuer": "5BBC0F22F61D9224A110650CFE21CC0C4BE13098",
"index": "1BBEF97EDE88D40CEE2ADE6FEF121166AFE80D99EBADB01A4F069BA8FF484000"
}
</code></pre></div>
<div class="code_sample" id="code-0-1" style="position: static;"><pre><code class="json">{
"Flags": 0,
"Indexes": [
"AD7EAE148287EF12D213A251015F86E6D4BD34B3C4A0A1ED9A17198373F908AD",
"E83BBB58949A8303DF07172B16FB8EFBA66B9191F3836EC27A4568ED5997BAC5"
],
"LedgerEntryType": "DirectoryNode",
"Owner": "rpR95n1iFkTqpoy1e878f4Z1pVHVtWKMNQ",
"RootIndex": "193C591BF62482468422313F9D3274B5927CA80B4DD3707E42015DD609E39C94",
"index": "193C591BF62482468422313F9D3274B5927CA80B4DD3707E42015DD609E39C94"
}
</code></pre></div>
</div>
<h2 id="directorynode-fields">DirectoryNode Fields</h2>
<table>
<thead>
<tr>
<th>Name</th>
<th>JSON Type</th>
<th><a href="serialization.html">Internal Type</a></th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>LedgerEntryType</code></td>
<td>String</td>
<td>UInt16</td>
<td>The value <code>0x0064</code>, mapped to the string <code>DirectoryNode</code>, indicates that this object is part of a Directory.</td>
</tr>
<tr>
<td><code>Flags</code></td>
<td>Number</td>
<td>UInt32</td>
<td>A bit-map of boolean flags enabled for this directory. Currently, the protocol defines no flags for DirectoryNode objects.</td>
</tr>
<tr>
<td><code>RootIndex</code></td>
<td>String</td>
<td>Hash256</td>
<td>The ID of root object for this directory.</td>
</tr>
<tr>
<td><code>Indexes</code></td>
<td>Array</td>
<td>Vector256</td>
<td>The contents of this Directory: an array of IDs of other objects.</td>
</tr>
<tr>
<td><code>IndexNext</code></td>
<td>Number</td>
<td>UInt64</td>
<td>(Optional) If this Directory consists of multiple pages, this ID links to the next object in the chain, wrapping around at the end.</td>
</tr>
<tr>
<td><code>IndexPrevious</code></td>
<td>Number</td>
<td>UInt64</td>
<td>(Optional) If this Directory consists of multiple pages, this ID links to the previous object in the chain, wrapping around at the beginning.</td>
</tr>
<tr>
<td><code>Owner</code></td>
<td>String</td>
<td>AccountID</td>
<td>(Owner Directories only) The address of the account that owns the objects in this directory.</td>
</tr>
<tr>
<td><code>ExchangeRate</code></td>
<td>Number</td>
<td>UInt64</td>
<td>(Offer Directories only) <strong>DEPRECATED</strong>. Do not use.</td>
</tr>
<tr>
<td><code>TakerPaysCurrency</code></td>
<td>String</td>
<td>Hash160</td>
<td>(Offer Directories only) The currency code of the TakerPays amount from the offers in this directory.</td>
</tr>
<tr>
<td><code>TakerPaysIssuer</code></td>
<td>String</td>
<td>Hash160</td>
<td>(Offer Directories only) The issuer of the TakerPays amount from the offers in this directory.</td>
</tr>
<tr>
<td><code>TakerGetsCurrency</code></td>
<td>String</td>
<td>Hash160</td>
<td>(Offer Directories only) The currency code of the TakerGets amount from the offers in this directory.</td>
</tr>
<tr>
<td><code>TakerGetsIssuer</code></td>
<td>String</td>
<td>Hash160</td>
<td>(Offer Directories only) The issuer of the TakerGets amount from the offers in this directory.</td>
</tr>
</tbody>
</table>
<h2 id="directory-id-formats">Directory ID Formats</h2>
<p>There are three different formulas for creating the ID of a DirectoryNode, depending on which of the following the DirectoryNode represents:</p>
<ul>
<li>The first page (also called the root) of an Owner Directory</li>
<li>The first page of an Offer Directory</li>
<li>Later pages of either type</li>
</ul>
<p><strong>The first page of an Owner Directory</strong> has an ID that is the <a href="basic-data-types.html#hashes">SHA-512Half</a> of the following values, concatenated in order:</p>
<ul>
<li>The Owner Directory space key (<code>0x004F</code>)</li>
<li>The AccountID from the <code>Owner</code> field.</li>
</ul>
<p><strong>The first page of an Offer Directory</strong> has a special ID: the higher 192 bits define the order book, and the remaining 64 bits define the exchange rate of the offers in that directory. (The ID is big-endian, so the book is in the more significant bits, which come first, and the quality is in the less significant bits which come last.) This provides a way to iterate through an order book from best offers to worst. Specifically: the first 192 bits are the first 192 bits of the <a href="basic-data-types.html#hashes">SHA-512Half</a> of the following values, concatenated in order:</p>
<ul>
<li>The Book Directory space key (<code>0x0042</code>)</li>
<li>The 160-bit currency code from the <code>TakerPaysCurrency</code></li>
<li>The 160-bit currency code from the <code>TakerGetsCurrency</code></li>
<li>The AccountID from the <code>TakerPaysIssuer</code></li>
<li>The AccountID from the <code>TakerGetsIssuer</code></li>
</ul>
<p>The lower 64 bits of an Offer Directory's ID represent the TakerPays amount divided by TakerGets amount from the offer(s) in that directory as a 64-bit number in the XAG Ledger's internal amount format.</p>
<p><strong>If the DirectoryNode is not the first page in the Directory</strong> (regardless of whether it is an Owner Directory or an Offer Directory), then it has an ID that is the <a href="basic-data-types.html#hashes">SHA-512Half</a> of the following values, concatenated in order:</p>
<ul>
<li>The DirectoryNode space key (<code>0x0064</code>)</li>
<li>The ID of the root DirectoryNode</li>
<li>The page number of this object. (Since 0 is the root DirectoryNode, this value is an integer 1 or higher.)</li>
</ul>
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