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<div class="subTitle">org.apache.drill.exec.expr</div>
<h2 title="Class CodeGenerator" class="title">Class CodeGenerator&lt;T&gt;</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li>org.apache.drill.exec.expr.CodeGenerator&lt;T&gt;</li>
</ul>
</li>
</ul>
<div class="description">
<ul class="blockList">
<li class="blockList">
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - The interface that results from compiling and merging the runtime
code that is generated.</dd>
</dl>
<hr>
<br>
<pre>public class <span class="typeNameLabel">CodeGenerator&lt;T&gt;</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">A code generator is responsible for generating the Java source code required
to complete the implementation of an abstract template.
A code generator can contain one or more ClassGenerators that implement
outer and inner classes associated with a particular runtime generated instance.
<p>
Drill supports two ways to generate and compile the code from a code
generator: via byte-code manipulations or as "plain Java."
<p>
When using byte-code transformations, the code generator is used with a
class transformer to merge precompiled template code with runtime generated and
compiled query specific code to create a runtime instance.
<p>
The code generator can optionally be marked as "plain Java" capable.
This means that the generated code can be compiled directly as a Java
class without the normal byte-code manipulations. Plain Java allows
the option to persist, and debug, the generated code when building new
generated classes or otherwise working with generated code. To turn
on debugging, see the explanation in <a href="../../../../../org/apache/drill/exec/compile/ClassBuilder.html" title="class in org.apache.drill.exec.compile"><code>ClassBuilder</code></a>.</div>
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</ul>
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#equals-java.lang.Object-">equals</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;obj)</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#generate--">generate</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#generateAndGet--">generateAndGet</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="class in org.apache.drill.exec.expr">CodeGenerator</a>&lt;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#get-org.apache.drill.exec.compile.sig.MappingSet-org.apache.drill.exec.compile.TemplateClassDefinition-org.apache.drill.exec.server.options.OptionSet-">get</a></span>(<a href="../../../../../org/apache/drill/exec/compile/sig/MappingSet.html" title="class in org.apache.drill.exec.compile.sig">MappingSet</a>&nbsp;mappingSet,
<a href="../../../../../org/apache/drill/exec/compile/TemplateClassDefinition.html" title="class in org.apache.drill.exec.compile">TemplateClassDefinition</a>&lt;T&gt;&nbsp;definition,
<a href="../../../../../org/apache/drill/exec/server/options/OptionSet.html" title="interface in org.apache.drill.exec.server.options">OptionSet</a>&nbsp;optionManager)</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="class in org.apache.drill.exec.expr">CodeGenerator</a>&lt;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#get-org.apache.drill.exec.compile.TemplateClassDefinition-">get</a></span>(<a href="../../../../../org/apache/drill/exec/compile/TemplateClassDefinition.html" title="class in org.apache.drill.exec.compile">TemplateClassDefinition</a>&lt;T&gt;&nbsp;definition)</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="class in org.apache.drill.exec.expr">CodeGenerator</a>&lt;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#get-org.apache.drill.exec.compile.TemplateClassDefinition-org.apache.drill.exec.server.options.OptionSet-">get</a></span>(<a href="../../../../../org/apache/drill/exec/compile/TemplateClassDefinition.html" title="class in org.apache.drill.exec.compile">TemplateClassDefinition</a>&lt;T&gt;&nbsp;definition,
<a href="../../../../../org/apache/drill/exec/server/options/OptionSet.html" title="interface in org.apache.drill.exec.server.options">OptionSet</a>&nbsp;optionManager)</code>&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#getClassName--">getClassName</a></span>()</code>&nbsp;</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/drill/exec/compile/TemplateClassDefinition.html" title="class in org.apache.drill.exec.compile">TemplateClassDefinition</a>&lt;<a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="type parameter in CodeGenerator">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#getDefinition--">getDefinition</a></span>()</code>&nbsp;</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#getGeneratedCode--">getGeneratedCode</a></span>()</code>&nbsp;</td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#getMaterializedClassName--">getMaterializedClassName</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.html" title="class in org.apache.drill.exec.expr">ClassGenerator</a>&lt;<a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="type parameter in CodeGenerator">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#getRoot--">getRoot</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.html" title="class in org.apache.drill.exec.expr">ClassGenerator</a>&lt;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#getRoot-org.apache.drill.exec.compile.sig.MappingSet-org.apache.drill.exec.compile.TemplateClassDefinition-org.apache.drill.exec.server.options.OptionSet-">getRoot</a></span>(<a href="../../../../../org/apache/drill/exec/compile/sig/MappingSet.html" title="class in org.apache.drill.exec.compile.sig">MappingSet</a>&nbsp;mappingSet,
<a href="../../../../../org/apache/drill/exec/compile/TemplateClassDefinition.html" title="class in org.apache.drill.exec.compile">TemplateClassDefinition</a>&lt;T&gt;&nbsp;definition,
<a href="../../../../../org/apache/drill/exec/server/options/OptionSet.html" title="interface in org.apache.drill.exec.server.options">OptionSet</a>&nbsp;optionManager)</code>&nbsp;</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.html" title="class in org.apache.drill.exec.expr">ClassGenerator</a>&lt;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#getRoot-org.apache.drill.exec.compile.TemplateClassDefinition-org.apache.drill.exec.server.options.OptionSet-">getRoot</a></span>(<a href="../../../../../org/apache/drill/exec/compile/TemplateClassDefinition.html" title="class in org.apache.drill.exec.compile">TemplateClassDefinition</a>&lt;T&gt;&nbsp;definition,
<a href="../../../../../org/apache/drill/exec/server/options/OptionSet.html" title="interface in org.apache.drill.exec.server.options">OptionSet</a>&nbsp;optionManager)</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#isCodeToBeSaved--">isCodeToBeSaved</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#isPlainJava--">isPlainJava</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#plainJavaCapable-boolean-">plainJavaCapable</a></span>(boolean&nbsp;flag)</code>
<div class="block">Indicates that the code for this class can be generated using the
"Plain Java" mechanism based on inheritance.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#preferPlainJava-boolean-">preferPlainJava</a></span>(boolean&nbsp;flag)</code>
<div class="block">Identifies that this generated class should be generated via the
plain Java mechanism.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#saveCodeForDebugging-boolean-">saveCodeForDebugging</a></span>(boolean&nbsp;persist)</code>
<div class="block">Debug-time option to persist the code for the generated class to permit debugging.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html#supportsPlainJava--">supportsPlainJava</a></span>()</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<pre>public&nbsp;void&nbsp;plainJavaCapable(boolean&nbsp;flag)</pre>
<div class="block">Indicates that the code for this class can be generated using the
"Plain Java" mechanism based on inheritance. The byte-code
method is more lenient, so some code is missing some features such
as proper exception labeling, etc. Set this option to true once
the generation mechanism for a class has been cleaned up to work
via the plain Java mechanism.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>flag</code> - true if the code generated from this instance is
ready to be compiled as a plain Java class</dd>
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<pre>public&nbsp;void&nbsp;preferPlainJava(boolean&nbsp;flag)</pre>
<div class="block">Identifies that this generated class should be generated via the
plain Java mechanism. This flag only has meaning if the
generated class is capable of plain Java generation.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>flag</code> - true if the class should be generated and compiled
as a plain Java class (rather than via byte-code manipulations)</dd>
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<pre>public&nbsp;boolean&nbsp;isPlainJava()</pre>
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<h4>saveCodeForDebugging</h4>
<pre>public&nbsp;void&nbsp;saveCodeForDebugging(boolean&nbsp;persist)</pre>
<div class="block">Debug-time option to persist the code for the generated class to permit debugging.
Has effect only when code is generated using the plain Java option. Code
is written to the code directory specified in <a href="../../../../../org/apache/drill/exec/compile/ClassBuilder.html" title="class in org.apache.drill.exec.compile"><code>ClassBuilder</code></a>.
To debug code, set this option, then point your IDE to the code directory
when the IDE prompts you for the source code location.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>persist</code> - true to write the code to disk, false (the default) to keep
code only in memory.</dd>
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<pre>public&nbsp;boolean&nbsp;isCodeToBeSaved()</pre>
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<h4>getRoot</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.html" title="class in org.apache.drill.exec.expr">ClassGenerator</a>&lt;<a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="type parameter in CodeGenerator">T</a>&gt;&nbsp;getRoot()</pre>
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<h4>generate</h4>
<pre>public&nbsp;void&nbsp;generate()</pre>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;generateAndGet()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>getGeneratedCode</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;getGeneratedCode()</pre>
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<pre>public&nbsp;<a href="../../../../../org/apache/drill/exec/compile/TemplateClassDefinition.html" title="class in org.apache.drill.exec.compile">TemplateClassDefinition</a>&lt;<a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="type parameter in CodeGenerator">T</a>&gt;&nbsp;getDefinition()</pre>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;getClassName()</pre>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
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