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| <div class="section" id="valuevector"> |
| <h1>ValueVector<a class="headerlink" href="#valuevector" title="Permalink to this headline">¶</a></h1> |
| <p><code class="xref py py-class docutils literal notranslate"><span class="pre">ValueVector</span></code> interface (which called Array in C++ implementation and |
| the <a class="reference internal" href="../format/Columnar.html"><span class="doc">the specification</span></a>) is an abstraction that is used to store a |
| sequence of values having the same type in an individual column. Internally, those values are |
| represented by one or several buffers, the number and meaning of which depend on the vector’s data type.</p> |
| <p>There are concrete subclasses of <code class="xref py py-class docutils literal notranslate"><span class="pre">ValueVector</span></code> for each primitive data type |
| and nested type described in the specification. There are a few differences in naming |
| with the type names described in the specification: |
| Table with non-intuitive names (BigInt = 64 bit integer, etc).</p> |
| <p>It is important that vector is allocated before attempting to read or write, |
| <code class="xref py py-class docutils literal notranslate"><span class="pre">ValueVector</span></code> “should” strive to guarantee this order of operation: |
| create > allocate > mutate > set value count > access > clear (or allocate to start the process over). |
| We will go through a concrete example to demonstrate each operation in the next section.</p> |
| <div class="section" id="vector-life-cycle"> |
| <h2>Vector Life Cycle<a class="headerlink" href="#vector-life-cycle" title="Permalink to this headline">¶</a></h2> |
| <p>As discussed above, each vector goes through several steps in its life cycle, |
| and each step is triggered by a vector operation. In particular, we have the following vector operations:</p> |
| <p>1. <strong>Vector creation</strong>: we create a new vector object by, for example, the vector constructor. |
| The following code creates a new <code class="docutils literal notranslate"><span class="pre">IntVector</span></code> by the constructor:</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="n">RootAllocator</span> <span class="n">allocator</span> <span class="o">=</span> <span class="k">new</span> <span class="n">RootAllocator</span><span class="o">(</span><span class="n">Long</span><span class="o">.</span><span class="na">MAX_VALUE</span><span class="o">);</span> |
| <span class="o">...</span> |
| <span class="n">IntVector</span> <span class="n">vector</span> <span class="o">=</span> <span class="k">new</span> <span class="n">IntVector</span><span class="o">(</span><span class="s">"int vector"</span><span class="o">,</span> <span class="n">allocator</span><span class="o">);</span> |
| </pre></div> |
| </div> |
| <p>By now, a vector object is created. However, no underlying memory has been allocated, so we need the |
| following step.</p> |
| <p>2. <strong>Vector allocation</strong>: in this step, we allocate memory for the vector. For most vectors, we |
| have two options: 1) if we know the maximum vector capacity, we can specify it by calling the |
| <code class="docutils literal notranslate"><span class="pre">allocateNew(int)</span></code> method; 2) otherwise, we should call the <code class="docutils literal notranslate"><span class="pre">allocateNew()</span></code> method, and a default |
| capacity will be allocated for it. For our running example, we assume that the vector capacity never |
| exceeds 10:</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="n">vector</span><span class="o">.</span><span class="na">allocateNew</span><span class="o">(</span><span class="mi">10</span><span class="o">);</span> |
| </pre></div> |
| </div> |
| <p>3. <strong>Vector mutation</strong>: now we can populate the vector with values we desire. For all vectors, we can populate |
| vector values through vector writers (An example will be given in the next section). For primitive types, |
| we can also mutate the vector by the set methods. There are two classes of set methods: 1) if we can |
| be sure the vector has enough capacity, we can call the <code class="docutils literal notranslate"><span class="pre">set(index,</span> <span class="pre">value)</span></code> method. 2) if we are not sure |
| about the vector capacity, we should call the <code class="docutils literal notranslate"><span class="pre">setSafe(index,</span> <span class="pre">value)</span></code> method, which will automatically |
| take care of vector reallocation, if the capacity is not sufficient. For our running example, we know the |
| vector has enough capacity, so we can call</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="n">vector</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="cm">/*index*/</span><span class="mi">5</span><span class="o">,</span> <span class="cm">/*value*/</span><span class="mi">25</span><span class="o">);</span> |
| </pre></div> |
| </div> |
| <p>4. <strong>Set value count</strong>: for this step, we set the value count of the vector by calling the |
| <code class="docutils literal notranslate"><span class="pre">setValueCount(int)</span></code> method:</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="n">vector</span><span class="o">.</span><span class="na">setValueCount</span><span class="o">(</span><span class="mi">10</span><span class="o">);</span> |
| </pre></div> |
| </div> |
| <p>After this step, the vector enters an immutable state. In other words, we should no longer mutate it. |
| (Unless we reuse the vector by allocating it again. This will be discussed shortly.)</p> |
| <p>5. <strong>Vector access</strong>: it is time to access vector values. Similarly, we have two options to access values: |
| 1) get methods and 2) vector reader. Vector reader works for all types of vectors, while get methods are |
| only available for primitive vectors. A concrete example for vector reader will be given in the next section. |
| Below is an example of vector access by get method:</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span> <span class="n">value</span> <span class="o">=</span> <span class="n">vector</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="mi">5</span><span class="o">);</span> <span class="c1">// value == 25</span> |
| </pre></div> |
| </div> |
| <p>6. <strong>Vector clear</strong>: when we are done with the vector, we should clear it to release its memory. This is done by |
| calling the <code class="docutils literal notranslate"><span class="pre">close()</span></code> method:</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="n">vector</span><span class="o">.</span><span class="na">close</span><span class="o">();</span> |
| </pre></div> |
| </div> |
| <p>Some points to note about the steps above:</p> |
| <ul class="simple"> |
| <li><p>The steps are not necessarily performed in a linear sequence. Instead, they can be in a loop. For example, |
| when a vector enters the access step, we can also go back to the vector mutation step, and then set value |
| count, access vector, and so on.</p></li> |
| <li><p>We should try to make sure the above steps are carried out in order. Otherwise, the vector |
| may be in an undefined state, and some unexpected behavior may occur. However, this restriction |
| is not strict. That means it is possible that we violates the order above, but still get |
| correct results.</p></li> |
| <li><p>When mutating vector values through set methods, we should prefer <code class="docutils literal notranslate"><span class="pre">set(index,</span> <span class="pre">value)</span></code> methods to |
| <code class="docutils literal notranslate"><span class="pre">setSafe(index,</span> <span class="pre">value)</span></code> methods whenever possible, to avoid unnecessary performance overhead of handling |
| vector capacity.</p></li> |
| <li><p>All vectors implement the <code class="docutils literal notranslate"><span class="pre">AutoCloseable</span></code> interface. So they must be closed explicitly when they are |
| no longer used, to avoid resource leak. To make sure of this, it is recommended to place vector related operations |
| into a try-with-resources block.</p></li> |
| <li><p>For fixed width vectors (e.g. IntVector), we can set values at different indices in arbitrary orders. |
| For variable width vectors (e.g. VarCharVector), however, we must set values in non-decreasing order of the |
| indices. Otherwise, the values after the set position will become invalid. For example, suppose we use the |
| following statements to populate a variable width vector:</p></li> |
| </ul> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="n">VarCharVector</span> <span class="n">vector</span> <span class="o">=</span> <span class="k">new</span> <span class="n">VarCharVector</span><span class="o">(</span><span class="s">"vector"</span><span class="o">,</span> <span class="n">allocator</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">allocateNew</span><span class="o">();</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">setSafe</span><span class="o">(</span><span class="mi">0</span><span class="o">,</span> <span class="s">"zero"</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">setSafe</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="s">"one"</span><span class="o">);</span> |
| <span class="o">...</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">setSafe</span><span class="o">(</span><span class="mi">9</span><span class="o">,</span> <span class="s">"nine"</span><span class="o">);</span> |
| </pre></div> |
| </div> |
| <p>Then we set the value at position 5 again:</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="n">vector</span><span class="o">.</span><span class="na">setSafe</span><span class="o">(</span><span class="mi">5</span><span class="o">,</span> <span class="s">"5"</span><span class="o">);</span> |
| </pre></div> |
| </div> |
| <p>After that, the values at positions 6, 7, 8, and 9 of the vector will become invalid.</p> |
| </div> |
| <div class="section" id="building-valuevector"> |
| <h2>Building ValueVector<a class="headerlink" href="#building-valuevector" title="Permalink to this headline">¶</a></h2> |
| <p>Note that the current implementation doesn’t enforce the rule that Arrow objects are immutable. |
| <code class="xref py py-class docutils literal notranslate"><span class="pre">ValueVector</span></code> instances could be created directly by using new keyword, there are |
| set/setSafe APIs and concrete subclasses of FieldWriter for populating values.</p> |
| <p>For example, the code below shows how to build a <code class="xref py py-class docutils literal notranslate"><span class="pre">BigIntVector</span></code>, in this case, we build a |
| vector of the range 0 to 7 where the element that should hold the fourth value is nulled</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="k">try</span> <span class="o">(</span><span class="n">BufferAllocator</span> <span class="n">allocator</span> <span class="o">=</span> <span class="k">new</span> <span class="n">RootAllocator</span><span class="o">(</span><span class="n">Long</span><span class="o">.</span><span class="na">MAX_VALUE</span><span class="o">);</span> |
| <span class="n">BigIntVector</span> <span class="n">vector</span> <span class="o">=</span> <span class="k">new</span> <span class="n">BigIntVector</span><span class="o">(</span><span class="s">"vector"</span><span class="o">,</span> <span class="n">allocator</span><span class="o">))</span> <span class="o">{</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">allocateNew</span><span class="o">(</span><span class="mi">8</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="mi">0</span><span class="o">,</span> <span class="mi">1</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="mi">2</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="mi">2</span><span class="o">,</span> <span class="mi">3</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">setNull</span><span class="o">(</span><span class="mi">3</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="mi">4</span><span class="o">,</span> <span class="mi">5</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="mi">5</span><span class="o">,</span> <span class="mi">6</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="mi">6</span><span class="o">,</span> <span class="mi">7</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">set</span><span class="o">(</span><span class="mi">7</span><span class="o">,</span> <span class="mi">8</span><span class="o">);</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">setValueCount</span><span class="o">(</span><span class="mi">8</span><span class="o">);</span> <span class="c1">// this will finalizes the vector by convention.</span> |
| <span class="o">...</span> |
| <span class="o">}</span> |
| </pre></div> |
| </div> |
| <p>The <code class="xref py py-class docutils literal notranslate"><span class="pre">BigIntVector</span></code> holds two ArrowBufs. The first buffer holds the null bitmap, which consists |
| here of a single byte with the bits 1|1|1|1|0|1|1|1 (the bit is 1 if the value is non-null). |
| The second buffer contains all the above values. As the fourth entry is null, the value at that position |
| in the buffer is undefined. Note compared with set API, setSafe API would check value capacity before setting |
| values and reallocate buffers if necessary.</p> |
| <p>Here is how to build a vector using writer</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="k">try</span> <span class="o">(</span><span class="n">BigIntVector</span> <span class="n">vector</span> <span class="o">=</span> <span class="k">new</span> <span class="n">BigIntVector</span><span class="o">(</span><span class="s">"vector"</span><span class="o">,</span> <span class="n">allocator</span><span class="o">);</span> |
| <span class="n">BigIntWriter</span> <span class="n">writer</span> <span class="o">=</span> <span class="k">new</span> <span class="n">BigIntWriterImpl</span><span class="o">(</span><span class="n">vector</span><span class="o">))</span> <span class="o">{</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">setPosition</span><span class="o">(</span><span class="mi">0</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">writeBigInt</span><span class="o">(</span><span class="mi">1</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">setPosition</span><span class="o">(</span><span class="mi">1</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">writeBigInt</span><span class="o">(</span><span class="mi">2</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">setPosition</span><span class="o">(</span><span class="mi">2</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">writeBigInt</span><span class="o">(</span><span class="mi">3</span><span class="o">);</span> |
| <span class="c1">// writer.setPosition(3) is not called which means the forth value is null.</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">setPosition</span><span class="o">(</span><span class="mi">4</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">writeBigInt</span><span class="o">(</span><span class="mi">5</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">setPosition</span><span class="o">(</span><span class="mi">5</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">writeBigInt</span><span class="o">(</span><span class="mi">6</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">setPosition</span><span class="o">(</span><span class="mi">6</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">writeBigInt</span><span class="o">(</span><span class="mi">7</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">setPosition</span><span class="o">(</span><span class="mi">7</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">writeBigInt</span><span class="o">(</span><span class="mi">8</span><span class="o">);</span> |
| <span class="o">}</span> |
| </pre></div> |
| </div> |
| <p>There are get API and concrete subclasses of <code class="xref py py-class docutils literal notranslate"><span class="pre">FieldReader</span></code> for accessing vector values, what needs |
| to be declared is that writer/reader is not as efficient as direct access</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="c1">// access via get API</span> |
| <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">vector</span><span class="o">.</span><span class="na">getValueCount</span><span class="o">();</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span> |
| <span class="k">if</span> <span class="o">(!</span><span class="n">vector</span><span class="o">.</span><span class="na">isNull</span><span class="o">(</span><span class="n">i</span><span class="o">))</span> <span class="o">{</span> |
| <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">vector</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="n">i</span><span class="o">));</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| |
| <span class="c1">// access via reader</span> |
| <span class="n">BigIntReader</span> <span class="n">reader</span> <span class="o">=</span> <span class="n">vector</span><span class="o">.</span><span class="na">getReader</span><span class="o">();</span> |
| <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">vector</span><span class="o">.</span><span class="na">getValueCount</span><span class="o">();</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span> |
| <span class="n">reader</span><span class="o">.</span><span class="na">setPosition</span><span class="o">(</span><span class="n">i</span><span class="o">);</span> |
| <span class="k">if</span> <span class="o">(</span><span class="n">reader</span><span class="o">.</span><span class="na">isSet</span><span class="o">())</span> <span class="o">{</span> |
| <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">reader</span><span class="o">.</span><span class="na">readLong</span><span class="o">());</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="building-listvector"> |
| <h2>Building ListVector<a class="headerlink" href="#building-listvector" title="Permalink to this headline">¶</a></h2> |
| <p>A <code class="xref py py-class docutils literal notranslate"><span class="pre">ListVector</span></code> is a vector that holds a list of values for each index. Working with one you need to handle the same steps as mentioned above (create > allocate > mutate > set value count > access > clear), but the details of how you accomplish this are slightly different since you need to both create the vector and set the list of values for each index.</p> |
| <p>For example, the code below shows how to build a <code class="xref py py-class docutils literal notranslate"><span class="pre">ListVector</span></code> of int’s using the writer <code class="xref py py-class docutils literal notranslate"><span class="pre">UnionListWriter</span></code>. We build a vector from 0 to 9 and each index contains a list with values [[0, 0, 0, 0, 0], [0, 1, 2, 3, 4], [0, 2, 4, 6, 8], …, [0, 9, 18, 27, 36]]. List values can be added in any order so writing a list such as [3, 1, 2] would be just as valid.</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="k">try</span> <span class="o">(</span><span class="n">BufferAllocator</span> <span class="n">allocator</span> <span class="o">=</span> <span class="k">new</span> <span class="n">RootAllocator</span><span class="o">(</span><span class="n">Long</span><span class="o">.</span><span class="na">MAX_VALUE</span><span class="o">);</span> |
| <span class="n">ListVector</span> <span class="n">listVector</span> <span class="o">=</span> <span class="n">ListVector</span><span class="o">.</span><span class="na">empty</span><span class="o">(</span><span class="s">"vector"</span><span class="o">,</span> <span class="n">allocator</span><span class="o">))</span> <span class="o">{</span> |
| <span class="n">UnionListWriter</span> <span class="n">writer</span> <span class="o">=</span> <span class="n">listVector</span><span class="o">.</span><span class="na">getWriter</span><span class="o">();</span> |
| <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">i</span> <span class="o"><</span> <span class="mi">10</span><span class="o">;</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">startList</span><span class="o">();</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">setPosition</span><span class="o">(</span><span class="n">i</span><span class="o">);</span> |
| <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">j</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">j</span> <span class="o"><</span> <span class="mi">5</span><span class="o">;</span> <span class="n">j</span><span class="o">++)</span> <span class="o">{</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">writeInt</span><span class="o">(</span><span class="n">j</span> <span class="o">*</span> <span class="n">i</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">setValueCount</span><span class="o">(</span><span class="mi">5</span><span class="o">);</span> |
| <span class="n">writer</span><span class="o">.</span><span class="na">endList</span><span class="o">();</span> |
| <span class="o">}</span> |
| <span class="n">listVector</span><span class="o">.</span><span class="na">setValueCount</span><span class="o">(</span><span class="mi">10</span><span class="o">);</span> |
| <span class="o">}</span> |
| </pre></div> |
| </div> |
| <p><code class="xref py py-class docutils literal notranslate"><span class="pre">ListVector</span></code> values can be accessed either through the get API or through the reader class <code class="xref py py-class docutils literal notranslate"><span class="pre">UnionListReader</span></code>. To read all the values, first enumerate through the indexes, and then enumerate through the inner list values.</p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="c1">// access via get API</span> |
| <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">listVector</span><span class="o">.</span><span class="na">getValueCount</span><span class="o">();</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span> |
| <span class="k">if</span> <span class="o">(!</span><span class="n">listVector</span><span class="o">.</span><span class="na">isNull</span><span class="o">(</span><span class="n">i</span><span class="o">))</span> <span class="o">{</span> |
| <span class="n">ArrayList</span><span class="o"><</span><span class="n">Integer</span><span class="o">></span> <span class="n">elements</span> <span class="o">=</span> <span class="o">(</span><span class="n">ArrayList</span><span class="o"><</span><span class="n">Integer</span><span class="o">>)</span> <span class="n">listVector</span><span class="o">.</span><span class="na">getObject</span><span class="o">(</span><span class="n">i</span><span class="o">);</span> |
| <span class="k">for</span> <span class="o">(</span><span class="n">Integer</span> <span class="n">element</span> <span class="o">:</span> <span class="n">elements</span><span class="o">)</span> <span class="o">{</span> |
| <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">element</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| |
| <span class="c1">// access via reader</span> |
| <span class="n">UnionListReader</span> <span class="n">reader</span> <span class="o">=</span> <span class="n">listVector</span><span class="o">.</span><span class="na">getReader</span><span class="o">();</span> |
| <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">listVector</span><span class="o">.</span><span class="na">getValueCount</span><span class="o">();</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span> |
| <span class="n">reader</span><span class="o">.</span><span class="na">setPosition</span><span class="o">(</span><span class="n">i</span><span class="o">);</span> |
| <span class="k">while</span> <span class="o">(</span><span class="n">reader</span><span class="o">.</span><span class="na">next</span><span class="o">())</span> <span class="o">{</span> |
| <span class="n">IntReader</span> <span class="n">intReader</span> <span class="o">=</span> <span class="n">reader</span><span class="o">.</span><span class="na">reader</span><span class="o">();</span> |
| <span class="k">if</span> <span class="o">(</span><span class="n">intReader</span><span class="o">.</span><span class="na">isSet</span><span class="o">())</span> <span class="o">{</span> |
| <span class="n">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">intReader</span><span class="o">.</span><span class="na">readInteger</span><span class="o">());</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="slicing"> |
| <h2>Slicing<a class="headerlink" href="#slicing" title="Permalink to this headline">¶</a></h2> |
| <p>Similar with C++ implementation, it is possible to make zero-copy slices of vectors to obtain a vector |
| referring to some logical sub-sequence of the data through <code class="xref py py-class docutils literal notranslate"><span class="pre">TransferPair</span></code></p> |
| <div class="highlight-Java notranslate"><div class="highlight"><pre><span></span><span class="n">IntVector</span> <span class="n">vector</span> <span class="o">=</span> <span class="k">new</span> <span class="n">IntVector</span><span class="o">(</span><span class="s">"intVector"</span><span class="o">,</span> <span class="n">allocator</span><span class="o">);</span> |
| <span class="k">for</span> <span class="o">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span> <span class="n">i</span> <span class="o"><</span> <span class="mi">10</span><span class="o">;</span> <span class="n">i</span><span class="o">++)</span> <span class="o">{</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">setSafe</span><span class="o">(</span><span class="n">i</span><span class="o">,</span> <span class="n">i</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="n">vector</span><span class="o">.</span><span class="na">setValueCount</span><span class="o">(</span><span class="mi">10</span><span class="o">);</span> |
| |
| <span class="n">TransferPair</span> <span class="n">tp</span> <span class="o">=</span> <span class="n">vector</span><span class="o">.</span><span class="na">getTransferPair</span><span class="o">(</span><span class="n">allocator</span><span class="o">);</span> |
| <span class="n">tp</span><span class="o">.</span><span class="na">splitAndTransfer</span><span class="o">(</span><span class="mi">0</span><span class="o">,</span> <span class="mi">5</span><span class="o">);</span> |
| <span class="n">IntVector</span> <span class="n">sliced</span> <span class="o">=</span> <span class="o">(</span><span class="n">IntVector</span><span class="o">)</span> <span class="n">tp</span><span class="o">.</span><span class="na">getTo</span><span class="o">();</span> |
| <span class="c1">// In this case, the vector values are [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] and the sliceVector values are [0, 1, 2, 3, 4].</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| |
| |
| </div> |
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