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<p class='location'>Struct MapBuilder</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.memory">memory</a><a href="#method.new">new</a><a href="#method.insert">insert</a><a href="#method.extend_iter">extend_iter</a><a href="#method.extend_stream">extend_stream</a><a href="#method.finish">finish</a><a href="#method.into_inner">into_inner</a><a href="#method.get_ref">get_ref</a><a href="#method.bytes_written">bytes_written</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='index.html'>fst</a></p><script>window.sidebarCurrent = {name: 'MapBuilder', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>fst</a>::<wbr><a class="struct" href=''>MapBuilder</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/fst/map.rs.html#491' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct MapBuilder<W>(_);</pre></div><div class='docblock'><p>A builder for creating a map.</p>
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<p>This is not your average everyday builder. It has two important qualities
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that make it a bit unique from what you might expect:</p>
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<ol>
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<li>All keys must be added in lexicographic order. Adding a key out of order
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will result in an error. Additionally, adding a duplicate key will also
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result in an error. That is, once a key is associated with a value,
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that association can never be modified or deleted.</li>
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<li>The representation of a map is streamed to <em>any</em> <code>io::Write</code> as it is
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built. For an in memory representation, this can be a <code>Vec<u8></code>.</li>
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</ol>
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<p>Point (2) is especially important because it means that a map can be
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constructed <em>without storing the entire map in memory</em>. Namely, since it
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works with any <code>io::Write</code>, it can be streamed directly to a file.</p>
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<p>With that said, the builder does use memory, but <strong>memory usage is bounded
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to a constant size</strong>. The amount of memory used trades off with the
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compression ratio. Currently, the implementation hard codes this trade off
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which can result in about 5-20MB of heap usage during construction. (N.B.
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Guaranteeing a maximal compression ratio requires memory proportional to
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the size of the map, which defeats some of the benefit of streaming
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it to disk. In practice, a small bounded amount of memory achieves
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close-to-minimal compression ratios.)</p>
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<p>The algorithmic complexity of map construction is <code>O(n)</code> where <code>n</code> is the
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number of elements added to the map.</p>
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<h1 id="example-build-in-memory" class="section-header"><a href="#example-build-in-memory">Example: build in memory</a></h1>
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<p>This shows how to use the builder to construct a map in memory. Note that
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<code>Map::from_iter</code> provides a convenience function that achieves this same
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goal without needing to explicitly use <code>MapBuilder</code>.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">fst</span>::{<span class="ident">IntoStreamer</span>, <span class="ident">Streamer</span>, <span class="ident">Map</span>, <span class="ident">MapBuilder</span>};
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">build</span> <span class="op">=</span> <span class="ident">MapBuilder</span>::<span class="ident">memory</span>();
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<span class="ident">build</span>.<span class="ident">insert</span>(<span class="string">"bruce"</span>, <span class="number">1</span>).<span class="ident">unwrap</span>();
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<span class="ident">build</span>.<span class="ident">insert</span>(<span class="string">"clarence"</span>, <span class="number">2</span>).<span class="ident">unwrap</span>();
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<span class="ident">build</span>.<span class="ident">insert</span>(<span class="string">"stevie"</span>, <span class="number">3</span>).<span class="ident">unwrap</span>();
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<span class="comment">// You could also call `finish()` here, but since we're building the map in</span>
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<span class="comment">// memory, there would be no way to get the `Vec<u8>` back.</span>
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<span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">build</span>.<span class="ident">into_inner</span>().<span class="ident">unwrap</span>();
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<span class="comment">// At this point, the map has been constructed, but here's how to read it.</span>
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<span class="kw">let</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">Map</span>::<span class="ident">from_bytes</span>(<span class="ident">bytes</span>).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stream</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">into_stream</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kvs</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
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<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">k</span>, <span class="ident">v</span>)) <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">next</span>() {
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<span class="ident">kvs</span>.<span class="ident">push</span>((<span class="ident">k</span>.<span class="ident">to_vec</span>(), <span class="ident">v</span>));
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}
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">kvs</span>, <span class="macro">vec</span><span class="macro">!</span>[
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(<span class="string">b"bruce"</span>.<span class="ident">to_vec</span>(), <span class="number">1</span>),
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(<span class="string">b"clarence"</span>.<span class="ident">to_vec</span>(), <span class="number">2</span>),
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(<span class="string">b"stevie"</span>.<span class="ident">to_vec</span>(), <span class="number">3</span>),
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]);</pre>
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<h1 id="example-stream-to-file" class="section-header"><a href="#example-stream-to-file">Example: stream to file</a></h1>
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<p>This shows how to do stream construction of a map to a file.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>;
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<span class="kw">use</span> <span class="ident">fst</span>::{<span class="ident">IntoStreamer</span>, <span class="ident">Streamer</span>, <span class="ident">Map</span>, <span class="ident">MapBuilder</span>};
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">wtr</span> <span class="op">=</span> <span class="ident">io</span>::<span class="ident">BufWriter</span>::<span class="ident">new</span>(<span class="ident">File</span>::<span class="ident">create</span>(<span class="string">"map.fst"</span>).<span class="ident">unwrap</span>());
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">build</span> <span class="op">=</span> <span class="ident">MapBuilder</span>::<span class="ident">new</span>(<span class="ident">wtr</span>).<span class="ident">unwrap</span>();
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<span class="ident">build</span>.<span class="ident">insert</span>(<span class="string">"bruce"</span>, <span class="number">1</span>).<span class="ident">unwrap</span>();
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<span class="ident">build</span>.<span class="ident">insert</span>(<span class="string">"clarence"</span>, <span class="number">2</span>).<span class="ident">unwrap</span>();
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<span class="ident">build</span>.<span class="ident">insert</span>(<span class="string">"stevie"</span>, <span class="number">3</span>).<span class="ident">unwrap</span>();
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<span class="comment">// If you want the writer back, then call `into_inner`. Otherwise, this</span>
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<span class="comment">// will finish construction and call `flush`.</span>
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<span class="ident">build</span>.<span class="ident">finish</span>().<span class="ident">unwrap</span>();
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<span class="comment">// At this point, the map has been constructed, but here's how to read it.</span>
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<span class="kw">let</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">Map</span>::<span class="ident">from_path</span>(<span class="string">"map.fst"</span>).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stream</span> <span class="op">=</span> <span class="ident">map</span>.<span class="ident">into_stream</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kvs</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
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<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">k</span>, <span class="ident">v</span>)) <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">next</span>() {
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<span class="ident">kvs</span>.<span class="ident">push</span>((<span class="ident">k</span>.<span class="ident">to_vec</span>(), <span class="ident">v</span>));
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}
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">kvs</span>, <span class="macro">vec</span><span class="macro">!</span>[
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(<span class="string">b"bruce"</span>.<span class="ident">to_vec</span>(), <span class="number">1</span>),
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(<span class="string">b"clarence"</span>.<span class="ident">to_vec</span>(), <span class="number">2</span>),
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(<span class="string">b"stevie"</span>.<span class="ident">to_vec</span>(), <span class="number">3</span>),
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]);</pre>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../fst/struct.MapBuilder.html" title="struct fst::MapBuilder">MapBuilder</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#493-498' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.memory' class="method"><span id='memory.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.memory' class='fnname'>memory</a>() -> Self</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#495-497' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create a builder that builds a map in memory.</p>
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</div></div><h3 id='impl-1' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a>> <a class="struct" href="../fst/struct.MapBuilder.html" title="struct fst::MapBuilder">MapBuilder</a><W></code><a href='#impl-1' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#500-571' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.new' class='fnname'>new</a>(wtr: W) -> <a class="type" href="../fst/type.Result.html" title="type fst::Result">Result</a><<a class="struct" href="../fst/struct.MapBuilder.html" title="struct fst::MapBuilder">MapBuilder</a><W>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#503-505' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create a builder that builds a map by writing it to <code>wtr</code> in a
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streaming fashion.</p>
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</div><h4 id='method.insert' class="method"><span id='insert.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.insert' class='fnname'>insert</a><K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>>>(&mut self, key: K, val: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -> <a class="type" href="../fst/type.Result.html" title="type fst::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#516-518' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Insert a new key-value pair into the map.</p>
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<p>Keys must be convertible to byte strings. Values must be a <code>u64</code>, which
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is a restriction of the current implementation of finite state
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transducers. (Values may one day be expanded to other types.)</p>
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<p>If a key is inserted that is less than or equal to any previous key
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added, then an error is returned. Similarly, if there was a problem
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writing to the underlying writer, an error is returned.</p>
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</div><h4 id='method.extend_iter' class="method"><span id='extend_iter.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.extend_iter' class='fnname'>extend_iter</a><K, I>(&mut self, iter: I) -> <a class="type" href="../fst/type.Result.html" title="type fst::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>> <span class="where fmt-newline">where<br> K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>>,<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a><Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>K, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#528-532' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Calls insert on each item in the iterator.</p>
|
||
<p>If an error occurred while adding an element, processing is stopped
|
||
and the error is returned.</p>
|
||
<p>If a key is inserted that is less than or equal to any previous key
|
||
added, then an error is returned. Similarly, if there was a problem
|
||
writing to the underlying writer, an error is returned.</p>
|
||
</div><h4 id='method.extend_stream' class="method"><span id='extend_stream.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.extend_stream' class='fnname'>extend_stream</a><'f, I, S>(&mut self, stream: I) -> <a class="type" href="../fst/type.Result.html" title="type fst::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>> <span class="where fmt-newline">where<br> I: for<'a> <a class="trait" href="../fst/trait.IntoStreamer.html" title="trait fst::IntoStreamer">IntoStreamer</a><'a, Into = S, Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>>,<br> S: 'f + for<'a> <a class="trait" href="../fst/trait.Streamer.html" title="trait fst::Streamer">Streamer</a><'a, Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#542-546' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Calls insert on each item in the stream.</p>
|
||
<p>Note that unlike <code>extend_iter</code>, this is not generic on the items in
|
||
the stream.</p>
|
||
<p>If a key is inserted that is less than or equal to any previous key
|
||
added, then an error is returned. Similarly, if there was a problem
|
||
writing to the underlying writer, an error is returned.</p>
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||
</div><h4 id='method.finish' class="method"><span id='finish.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.finish' class='fnname'>finish</a>(self) -> <a class="type" href="../fst/type.Result.html" title="type fst::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#551-553' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Finishes the construction of the map and flushes the underlying
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writer. After completion, the data written to <code>W</code> may be read using
|
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one of <code>Map</code>'s constructor methods.</p>
|
||
</div><h4 id='method.into_inner' class="method"><span id='into_inner.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.into_inner' class='fnname'>into_inner</a>(self) -> <a class="type" href="../fst/type.Result.html" title="type fst::Result">Result</a><W></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#557-559' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Just like <code>finish</code>, except it returns the underlying writer after
|
||
flushing it.</p>
|
||
</div><h4 id='method.get_ref' class="method"><span id='get_ref.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.get_ref' class='fnname'>get_ref</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>W</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#562-564' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Gets a reference to the underlying writer.</p>
|
||
</div><h4 id='method.bytes_written' class="method"><span id='bytes_written.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.bytes_written' class='fnname'>bytes_written</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/fst/map.rs.html#567-569' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns the number of bytes written to the underlying writer</p>
|
||
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|
||
<h2 id='implementations' class='small-section-header'>
|
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