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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.linq4j.tree</a></div>
<h2 title="Class DeterministicCodeOptimizer" class="title">Class DeterministicCodeOptimizer</h2>
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<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="Shuttle.html" title="class in org.apache.calcite.linq4j.tree">org.apache.calcite.linq4j.tree.Shuttle</a></li>
<li>
<ul class="inheritance">
<li><a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">org.apache.calcite.linq4j.tree.ClassDeclarationFinder</a></li>
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<ul class="inheritance">
<li>org.apache.calcite.linq4j.tree.DeterministicCodeOptimizer</li>
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<pre>public class <span class="typeNameLabel">DeterministicCodeOptimizer</span>
extends <a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a></pre>
<div class="block">Factors out deterministic expressions to final static fields.
Instances of this class should not be reused, so new visitor should be
created for optimizing a new expression tree.</div>
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<!-- =========== FIELD SUMMARY =========== -->
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<h3>Field Summary</h3>
<table class="memberSummary">
<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Field</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.util.Map&lt;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>,&#8203;java.lang.Boolean&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#constants">constants</a></span></code></th>
<td class="colLast">
<div class="block">The map contains known to be effectively-final expression.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.util.Map&lt;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>,&#8203;<a href="ParameterExpression.html" title="class in org.apache.calcite.linq4j.tree">ParameterExpression</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#dedup">dedup</a></span></code></th>
<td class="colLast">
<div class="block">The map that de-duplicates expressions, so the same expressions may reuse
the same final static fields.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static java.util.Set&lt;java.lang.Class&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DETERMINISTIC_CLASSES">DETERMINISTIC_CLASSES</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private static java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#FIELD_PREFIX">FIELD_PREFIX</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.util.Map&lt;java.lang.String,&#8203;<a href="ParameterExpression.html" title="class in org.apache.calcite.linq4j.tree">ParameterExpression</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fieldsByName">fieldsByName</a></span></code></th>
<td class="colLast">
<div class="block">The map of all the added final static fields.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private static java.util.regex.Pattern</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#NON_ASCII">NON_ASCII</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static java.util.regex.Pattern</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#PREFIX_PATTERN">PREFIX_PATTERN</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<h3>Fields inherited from class&nbsp;org.apache.calcite.linq4j.tree.<a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a></h3>
<code><a href="ClassDeclarationFinder.html#addedDeclarations">addedDeclarations</a>, <a href="ClassDeclarationFinder.html#parent">parent</a></code></li>
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<h3>Constructor Summary</h3>
<table class="memberSummary">
<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Constructor</th>
<th class="colLast" scope="col">Description</th>
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<tr class="altColor">
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.calcite.linq4j.tree.ClassDeclarationFinder)">DeterministicCodeOptimizer</a></span>&#8203;(<a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a>&nbsp;parent)</code></th>
<td class="colLast">
<div class="block">Creates a child optimizer.</div>
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<h3>Method Summary</h3>
<table class="memberSummary">
<caption><span id="t0" class="activeTableTab"><span>All Methods</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="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#allMethodsDeterministic(java.lang.Class)">allMethodsDeterministic</a></span>&#8203;(java.lang.Class&nbsp;klass)</code></th>
<td class="colLast">
<div class="block">Checks if all the methods in given class are deterministic (i.e.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected <a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#createField(org.apache.calcite.linq4j.tree.Expression)">createField</a></span>&#8203;(<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</code></th>
<td class="colLast">
<div class="block">Creates final static field to hold the given expression.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>protected <a href="ParameterExpression.html" title="class in org.apache.calcite.linq4j.tree">ParameterExpression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#findDeclaredExpression(org.apache.calcite.linq4j.tree.Expression)">findDeclaredExpression</a></span>&#8203;(<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</code></th>
<td class="colLast">
<div class="block">Finds if there exists ready for reuse declaration for given expression.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>private &lt;C&gt;&nbsp;java.lang.reflect.Constructor&lt;C&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getConstructor(java.lang.Class)">getConstructor</a></span>&#8203;(java.lang.Class&lt;C&gt;&nbsp;klass)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>protected <a href="DeterministicCodeOptimizer.html" title="class in org.apache.calcite.linq4j.tree">DeterministicCodeOptimizer</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#goDeeper()">goDeeper</a></span>()</code></th>
<td class="colLast">
<div class="block">Creates child visitor.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hasField(java.lang.String)">hasField</a></span>&#8203;(java.lang.String&nbsp;name)</code></th>
<td class="colLast">
<div class="block">Verifies if the variable name is already in use.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>protected java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#inventFieldName(org.apache.calcite.linq4j.tree.Expression)">inventFieldName</a></span>&#8203;(<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</code></th>
<td class="colLast">
<div class="block">Generates field name to store given expression.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isConstant(org.apache.calcite.linq4j.tree.Expression)">isConstant</a></span>&#8203;(<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</code></th>
<td class="colLast">
<div class="block">Verifies if the expression is effectively constant.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isConstructorDeterministic(org.apache.calcite.linq4j.tree.NewExpression)">isConstructorDeterministic</a></span>&#8203;(<a href="NewExpression.html" title="class in org.apache.calcite.linq4j.tree">NewExpression</a>&nbsp;newExpression)</code></th>
<td class="colLast">
<div class="block">Checks if new instance creation can be reused.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isMethodDeterministic(java.lang.reflect.Method)">isMethodDeterministic</a></span>&#8203;(java.lang.reflect.Method&nbsp;method)</code></th>
<td class="colLast">
<div class="block">Checks if given method is deterministic (i.e.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#learnFinalStaticDeclarations(java.util.List)">learnFinalStaticDeclarations</a></span>&#8203;(java.util.List&lt;<a href="MemberDeclaration.html" title="class in org.apache.calcite.linq4j.tree">MemberDeclaration</a>&gt;&nbsp;memberDeclarations)</code></th>
<td class="colLast">
<div class="block">Processes the list of declarations and learns final static ones as
effectively constant.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>protected <a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#tryOptimizeMethodCall(org.apache.calcite.linq4j.tree.MethodCallExpression)">tryOptimizeMethodCall</a></span>&#8203;(<a href="MethodCallExpression.html" title="class in org.apache.calcite.linq4j.tree">MethodCallExpression</a>&nbsp;methodCallExpression)</code></th>
<td class="colLast">
<div class="block">Optimized method call, possibly converting it to final static field.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>protected <a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#tryOptimizeNewInstance(org.apache.calcite.linq4j.tree.NewExpression)">tryOptimizeNewInstance</a></span>&#8203;(<a href="NewExpression.html" title="class in org.apache.calcite.linq4j.tree">NewExpression</a>&nbsp;newExpression)</code></th>
<td class="colLast">
<div class="block">Optimizes <code>new Type()</code> constructs,</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visit(org.apache.calcite.linq4j.tree.BinaryExpression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Expression)">visit</a></span>&#8203;(<a href="BinaryExpression.html" title="class in org.apache.calcite.linq4j.tree">BinaryExpression</a>&nbsp;binaryExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression0,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression1)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="MemberDeclaration.html" title="class in org.apache.calcite.linq4j.tree">MemberDeclaration</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visit(org.apache.calcite.linq4j.tree.FieldDeclaration,org.apache.calcite.linq4j.tree.Expression)">visit</a></span>&#8203;(<a href="FieldDeclaration.html" title="class in org.apache.calcite.linq4j.tree">FieldDeclaration</a>&nbsp;fieldDeclaration,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;initializer)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visit(org.apache.calcite.linq4j.tree.MemberExpression,org.apache.calcite.linq4j.tree.Expression)">visit</a></span>&#8203;(<a href="MemberExpression.html" title="class in org.apache.calcite.linq4j.tree">MemberExpression</a>&nbsp;memberExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code><a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visit(org.apache.calcite.linq4j.tree.MethodCallExpression,org.apache.calcite.linq4j.tree.Expression,java.util.List)">visit</a></span>&#8203;(<a href="MethodCallExpression.html" title="class in org.apache.calcite.linq4j.tree">MethodCallExpression</a>&nbsp;methodCallExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;targetExpression,
java.util.List&lt;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&gt;&nbsp;expressions)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code><a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visit(org.apache.calcite.linq4j.tree.TernaryExpression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Expression)">visit</a></span>&#8203;(<a href="TernaryExpression.html" title="class in org.apache.calcite.linq4j.tree">TernaryExpression</a>&nbsp;ternaryExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression0,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression1,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression2)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code><a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visit(org.apache.calcite.linq4j.tree.TypeBinaryExpression,org.apache.calcite.linq4j.tree.Expression)">visit</a></span>&#8203;(<a href="TypeBinaryExpression.html" title="class in org.apache.calcite.linq4j.tree">TypeBinaryExpression</a>&nbsp;typeBinaryExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code><a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visit(org.apache.calcite.linq4j.tree.UnaryExpression,org.apache.calcite.linq4j.tree.Expression)">visit</a></span>&#8203;(<a href="UnaryExpression.html" title="class in org.apache.calcite.linq4j.tree">UnaryExpression</a>&nbsp;unaryExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</code></th>
<td class="colLast">&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.apache.calcite.linq4j.tree.<a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a></h3>
<code><a href="ClassDeclarationFinder.html#create()">create</a>, <a href="ClassDeclarationFinder.html#create(java.lang.Class)">create</a>, <a href="ClassDeclarationFinder.html#create(org.apache.calcite.linq4j.function.Function1)">create</a>, <a href="ClassDeclarationFinder.html#isConstant(java.lang.Iterable)">isConstant</a>, <a href="ClassDeclarationFinder.html#optimizeDeclarations(java.util.List)">optimizeDeclarations</a>, <a href="ClassDeclarationFinder.html#preVisit(org.apache.calcite.linq4j.tree.ClassDeclaration)">preVisit</a>, <a href="ClassDeclarationFinder.html#preVisit(org.apache.calcite.linq4j.tree.NewExpression)">preVisit</a>, <a href="ClassDeclarationFinder.html#visit(org.apache.calcite.linq4j.tree.ClassDeclaration,java.util.List)">visit</a>, <a href="ClassDeclarationFinder.html#visit(org.apache.calcite.linq4j.tree.NewExpression,java.util.List,java.util.List)">visit</a></code></li>
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<h3>Methods inherited from class&nbsp;org.apache.calcite.linq4j.tree.<a href="Shuttle.html" title="class in org.apache.calcite.linq4j.tree">Shuttle</a></h3>
<code><a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.BinaryExpression)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.BlockStatement)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.ConditionalStatement)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.ConstructorDeclaration)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.DeclarationStatement)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.FieldDeclaration)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.ForEachStatement)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.ForStatement)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.FunctionExpression)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.GotoStatement)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.IndexExpression)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.MemberExpression)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.MethodCallExpression)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.MethodDeclaration)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.NewArrayExpression)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.TernaryExpression)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.ThrowStatement)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.TryStatement)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.TypeBinaryExpression)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.UnaryExpression)">preVisit</a>, <a href="Shuttle.html#preVisit(org.apache.calcite.linq4j.tree.WhileStatement)">preVisit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.BlockStatement,java.util.List)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.ConditionalStatement,java.util.List)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.ConstantExpression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.ConstructorDeclaration,org.apache.calcite.linq4j.tree.BlockStatement)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.DeclarationStatement,org.apache.calcite.linq4j.tree.Expression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.DefaultExpression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.DynamicExpression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.ForEachStatement,org.apache.calcite.linq4j.tree.ParameterExpression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Statement)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.ForStatement,java.util.List,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Statement)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.FunctionExpression,org.apache.calcite.linq4j.tree.BlockStatement)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.GotoStatement,org.apache.calcite.linq4j.tree.Expression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.IndexExpression,org.apache.calcite.linq4j.tree.Expression,java.util.List)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.InvocationExpression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.LabelStatement)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.LambdaExpression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.ListInitExpression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.MemberInitExpression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.MethodDeclaration,org.apache.calcite.linq4j.tree.BlockStatement)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.NewArrayExpression,int,org.apache.calcite.linq4j.tree.Expression,java.util.List)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.ParameterExpression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.SwitchStatement)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.ThrowStatement,org.apache.calcite.linq4j.tree.Expression)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.TryStatement,org.apache.calcite.linq4j.tree.Statement,java.util.List,org.apache.calcite.linq4j.tree.Statement)">visit</a>, <a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.WhileStatement,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Statement)">visit</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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</ul>
</section>
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<h3>Field Detail</h3>
<a id="constants">
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<h4>constants</h4>
<pre>protected final&nbsp;java.util.Map&lt;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>,&#8203;java.lang.Boolean&gt; constants</pre>
<div class="block">The map contains known to be effectively-final expression.
The map uses identity equality.
Typically the key is <code>ParameterExpression</code>, however there might be
non-factored to final field expression that is known to be constant.
For instance, cast expression will not be factored to a field,
but we still need to track its constant status.</div>
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<h4>dedup</h4>
<pre>protected final&nbsp;java.util.Map&lt;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>,&#8203;<a href="ParameterExpression.html" title="class in org.apache.calcite.linq4j.tree">ParameterExpression</a>&gt; dedup</pre>
<div class="block">The map that de-duplicates expressions, so the same expressions may reuse
the same final static fields.</div>
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<h4>fieldsByName</h4>
<pre>protected final&nbsp;java.util.Map&lt;java.lang.String,&#8203;<a href="ParameterExpression.html" title="class in org.apache.calcite.linq4j.tree">ParameterExpression</a>&gt; fieldsByName</pre>
<div class="block">The map of all the added final static fields. Allows to identify if the
name is occupied or not.</div>
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<pre>private static final&nbsp;java.util.regex.Pattern NON_ASCII</pre>
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<pre>private static final&nbsp;java.lang.String FIELD_PREFIX</pre>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#org.apache.calcite.linq4j.tree.DeterministicCodeOptimizer.FIELD_PREFIX">Constant Field Values</a></dd>
</dl>
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<pre>private static final&nbsp;java.util.regex.Pattern PREFIX_PATTERN</pre>
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<pre>private static final&nbsp;java.util.Set&lt;java.lang.Class&gt; DETERMINISTIC_CLASSES</pre>
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<li class="blockList"><a id="constructor.detail">
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<h3>Constructor Detail</h3>
<a id="&lt;init&gt;(org.apache.calcite.linq4j.tree.ClassDeclarationFinder)">
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<h4>DeterministicCodeOptimizer</h4>
<pre>public&nbsp;DeterministicCodeOptimizer&#8203;(<a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a>&nbsp;parent)</pre>
<div class="block">Creates a child optimizer.
Typically a child is created for each class declaration,
so each optimizer collects fields for exactly one class.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>parent</code> - parent optimizer</dd>
</dl>
</li>
</ul>
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<a id="tryOptimizeNewInstance(org.apache.calcite.linq4j.tree.NewExpression)">
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<h4>tryOptimizeNewInstance</h4>
<pre class="methodSignature">protected&nbsp;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;tryOptimizeNewInstance&#8203;(<a href="NewExpression.html" title="class in org.apache.calcite.linq4j.tree">NewExpression</a>&nbsp;newExpression)</pre>
<div class="block">Optimizes <code>new Type()</code> constructs,</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="ClassDeclarationFinder.html#tryOptimizeNewInstance(org.apache.calcite.linq4j.tree.NewExpression)">tryOptimizeNewInstance</a></code>&nbsp;in class&nbsp;<code><a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>newExpression</code> - expression to optimize</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>optimized expression</dd>
</dl>
</li>
</ul>
<a id="visit(org.apache.calcite.linq4j.tree.BinaryExpression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Expression)">
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<h4>visit</h4>
<pre class="methodSignature">public&nbsp;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;visit&#8203;(<a href="BinaryExpression.html" title="class in org.apache.calcite.linq4j.tree">BinaryExpression</a>&nbsp;binaryExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression0,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression1)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.BinaryExpression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Expression)">visit</a></code>&nbsp;in class&nbsp;<code><a href="Shuttle.html" title="class in org.apache.calcite.linq4j.tree">Shuttle</a></code></dd>
</dl>
</li>
</ul>
<a id="visit(org.apache.calcite.linq4j.tree.TernaryExpression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Expression)">
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<h4>visit</h4>
<pre class="methodSignature">public&nbsp;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;visit&#8203;(<a href="TernaryExpression.html" title="class in org.apache.calcite.linq4j.tree">TernaryExpression</a>&nbsp;ternaryExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression0,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression1,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression2)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.TernaryExpression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Expression,org.apache.calcite.linq4j.tree.Expression)">visit</a></code>&nbsp;in class&nbsp;<code><a href="Shuttle.html" title="class in org.apache.calcite.linq4j.tree">Shuttle</a></code></dd>
</dl>
</li>
</ul>
<a id="visit(org.apache.calcite.linq4j.tree.UnaryExpression,org.apache.calcite.linq4j.tree.Expression)">
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<h4>visit</h4>
<pre class="methodSignature">public&nbsp;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;visit&#8203;(<a href="UnaryExpression.html" title="class in org.apache.calcite.linq4j.tree">UnaryExpression</a>&nbsp;unaryExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.UnaryExpression,org.apache.calcite.linq4j.tree.Expression)">visit</a></code>&nbsp;in class&nbsp;<code><a href="Shuttle.html" title="class in org.apache.calcite.linq4j.tree">Shuttle</a></code></dd>
</dl>
</li>
</ul>
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<h4>visit</h4>
<pre class="methodSignature">public&nbsp;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;visit&#8203;(<a href="TypeBinaryExpression.html" title="class in org.apache.calcite.linq4j.tree">TypeBinaryExpression</a>&nbsp;typeBinaryExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.TypeBinaryExpression,org.apache.calcite.linq4j.tree.Expression)">visit</a></code>&nbsp;in class&nbsp;<code><a href="Shuttle.html" title="class in org.apache.calcite.linq4j.tree">Shuttle</a></code></dd>
</dl>
</li>
</ul>
<a id="tryOptimizeMethodCall(org.apache.calcite.linq4j.tree.MethodCallExpression)">
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<h4>tryOptimizeMethodCall</h4>
<pre class="methodSignature">protected&nbsp;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;tryOptimizeMethodCall&#8203;(<a href="MethodCallExpression.html" title="class in org.apache.calcite.linq4j.tree">MethodCallExpression</a>&nbsp;methodCallExpression)</pre>
<div class="block">Optimized method call, possibly converting it to final static field.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>methodCallExpression</code> - method call to optimize</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>optimized expression</dd>
</dl>
</li>
</ul>
<a id="visit(org.apache.calcite.linq4j.tree.MethodCallExpression,org.apache.calcite.linq4j.tree.Expression,java.util.List)">
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<h4>visit</h4>
<pre class="methodSignature">public&nbsp;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;visit&#8203;(<a href="MethodCallExpression.html" title="class in org.apache.calcite.linq4j.tree">MethodCallExpression</a>&nbsp;methodCallExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;targetExpression,
java.util.List&lt;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&gt;&nbsp;expressions)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.MethodCallExpression,org.apache.calcite.linq4j.tree.Expression,java.util.List)">visit</a></code>&nbsp;in class&nbsp;<code><a href="Shuttle.html" title="class in org.apache.calcite.linq4j.tree">Shuttle</a></code></dd>
</dl>
</li>
</ul>
<a id="visit(org.apache.calcite.linq4j.tree.MemberExpression,org.apache.calcite.linq4j.tree.Expression)">
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<ul class="blockList">
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<h4>visit</h4>
<pre class="methodSignature">public&nbsp;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;visit&#8203;(<a href="MemberExpression.html" title="class in org.apache.calcite.linq4j.tree">MemberExpression</a>&nbsp;memberExpression,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.MemberExpression,org.apache.calcite.linq4j.tree.Expression)">visit</a></code>&nbsp;in class&nbsp;<code><a href="Shuttle.html" title="class in org.apache.calcite.linq4j.tree">Shuttle</a></code></dd>
</dl>
</li>
</ul>
<a id="visit(org.apache.calcite.linq4j.tree.FieldDeclaration,org.apache.calcite.linq4j.tree.Expression)">
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<h4>visit</h4>
<pre class="methodSignature">public&nbsp;<a href="MemberDeclaration.html" title="class in org.apache.calcite.linq4j.tree">MemberDeclaration</a>&nbsp;visit&#8203;(<a href="FieldDeclaration.html" title="class in org.apache.calcite.linq4j.tree">FieldDeclaration</a>&nbsp;fieldDeclaration,
<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;initializer)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="Shuttle.html#visit(org.apache.calcite.linq4j.tree.FieldDeclaration,org.apache.calcite.linq4j.tree.Expression)">visit</a></code>&nbsp;in class&nbsp;<code><a href="Shuttle.html" title="class in org.apache.calcite.linq4j.tree">Shuttle</a></code></dd>
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<a id="learnFinalStaticDeclarations(java.util.List)">
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<h4>learnFinalStaticDeclarations</h4>
<pre class="methodSignature">protected&nbsp;void&nbsp;learnFinalStaticDeclarations&#8203;(java.util.List&lt;<a href="MemberDeclaration.html" title="class in org.apache.calcite.linq4j.tree">MemberDeclaration</a>&gt;&nbsp;memberDeclarations)</pre>
<div class="block">Processes the list of declarations and learns final static ones as
effectively constant.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="ClassDeclarationFinder.html#learnFinalStaticDeclarations(java.util.List)">learnFinalStaticDeclarations</a></code>&nbsp;in class&nbsp;<code><a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>memberDeclarations</code> - list of declarations to search finals from</dd>
</dl>
</li>
</ul>
<a id="findDeclaredExpression(org.apache.calcite.linq4j.tree.Expression)">
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<h4>findDeclaredExpression</h4>
<pre class="methodSignature">protected&nbsp;<a href="ParameterExpression.html" title="class in org.apache.calcite.linq4j.tree">ParameterExpression</a>&nbsp;findDeclaredExpression&#8203;(<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</pre>
<div class="block">Finds if there exists ready for reuse declaration for given expression.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="ClassDeclarationFinder.html#findDeclaredExpression(org.apache.calcite.linq4j.tree.Expression)">findDeclaredExpression</a></code>&nbsp;in class&nbsp;<code><a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>expression</code> - input expression</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>parameter of the already existing declaration, or null</dd>
</dl>
</li>
</ul>
<a id="createField(org.apache.calcite.linq4j.tree.Expression)">
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<h4>createField</h4>
<pre class="methodSignature">protected&nbsp;<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;createField&#8203;(<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</pre>
<div class="block">Creates final static field to hold the given expression.
The method might reuse existing declarations if appropriate.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>expression</code> - expression to store in final field</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>expression for the given input expression</dd>
</dl>
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<a id="inventFieldName(org.apache.calcite.linq4j.tree.Expression)">
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<h4>inventFieldName</h4>
<pre class="methodSignature">protected&nbsp;java.lang.String&nbsp;inventFieldName&#8203;(<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</pre>
<div class="block">Generates field name to store given expression.
The expression is converted to string and all the non-ascii/numeric
characters are replaced with underscores and <code>"_$L4J$C$"</code> suffix is
added to avoid conflicts with other variables.
When multiple variables are mangled to the same name,
counter is used to avoid conflicts.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>expression</code> - input expression</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>unique name to store given expression</dd>
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<h4>isConstant</h4>
<pre class="methodSignature">protected&nbsp;boolean&nbsp;isConstant&#8203;(<a href="Expression.html" title="class in org.apache.calcite.linq4j.tree">Expression</a>&nbsp;expression)</pre>
<div class="block">Verifies if the expression is effectively constant.
It is assumed the expression is simple (e.g. <code>ConstantExpression</code> or
<code>ParameterExpression</code>).
The method verifies parent chain since the expression might be defined
in enclosing class.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="ClassDeclarationFinder.html#isConstant(org.apache.calcite.linq4j.tree.Expression)">isConstant</a></code>&nbsp;in class&nbsp;<code><a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>expression</code> - expression to test</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true when the expression is known to be constant</dd>
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<h4>isMethodDeterministic</h4>
<pre class="methodSignature">protected&nbsp;boolean&nbsp;isMethodDeterministic&#8203;(java.lang.reflect.Method&nbsp;method)</pre>
<div class="block">Checks if given method is deterministic (i.e. returns the same output
given the same inputs).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>method</code> - method to test</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true when the method is deterministic</dd>
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<h4>isConstructorDeterministic</h4>
<pre class="methodSignature">protected&nbsp;boolean&nbsp;isConstructorDeterministic&#8203;(<a href="NewExpression.html" title="class in org.apache.calcite.linq4j.tree">NewExpression</a>&nbsp;newExpression)</pre>
<div class="block">Checks if new instance creation can be reused. For instance <code>new
BigInteger("42")</code> is effectively final and can be reused.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>newExpression</code> - method to test</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true when the method is deterministic</dd>
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<h4>getConstructor</h4>
<pre class="methodSignature">private&nbsp;&lt;C&gt;&nbsp;java.lang.reflect.Constructor&lt;C&gt;&nbsp;getConstructor&#8203;(java.lang.Class&lt;C&gt;&nbsp;klass)</pre>
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<h4>allMethodsDeterministic</h4>
<pre class="methodSignature">protected&nbsp;boolean&nbsp;allMethodsDeterministic&#8203;(java.lang.Class&nbsp;klass)</pre>
<div class="block">Checks if all the methods in given class are deterministic (i.e. return
the same value given the same inputs)</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>klass</code> - class to test</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true when all the methods including constructors are deterministic</dd>
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<h4>hasField</h4>
<pre class="methodSignature">protected&nbsp;boolean&nbsp;hasField&#8203;(java.lang.String&nbsp;name)</pre>
<div class="block">Verifies if the variable name is already in use.
Only the variables that are explicitly added to <code>fieldsByName</code> are
verified. The method verifies parent chain.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="ClassDeclarationFinder.html#hasField(java.lang.String)">hasField</a></code>&nbsp;in class&nbsp;<code><a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - name of the variable to test</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the name is used by one of static final fields</dd>
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<h4>goDeeper</h4>
<pre class="methodSignature">protected&nbsp;<a href="DeterministicCodeOptimizer.html" title="class in org.apache.calcite.linq4j.tree">DeterministicCodeOptimizer</a>&nbsp;goDeeper()</pre>
<div class="block">Creates child visitor. It is used to traverse nested class declarations.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="ClassDeclarationFinder.html#goDeeper()">goDeeper</a></code>&nbsp;in class&nbsp;<code><a href="ClassDeclarationFinder.html" title="class in org.apache.calcite.linq4j.tree">ClassDeclarationFinder</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>new Visitor that is used to optimize class declarations</dd>
</dl>
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