org/apache/sis/filter/Optimization.html - sis-site - Git at Google

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 <div class="header">
 <div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.sis.filter</a></div>
 <h1 title="Class Optimization" class="title">Class Optimization</h1>
 </div>
 <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>
 <div class="inheritance">Optimization</div>
 </div>
 <section class="class-description" id="class-description">
 <hr>
 <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">Optimization</span>
 <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div>
 <div class="block">Description of optimizations or simplifications to attempt on filters and expressions.
  Optimizations can include the following changes:

  <ul>
    <li>Application of some logical identities such as <code>NOT(NOT(A)) == A</code>.</li>
    <li>Application of logical short circuits such as <code>A &amp; FALSE == FALSE</code>.</li>
    <li>Immediate evaluation of expressions where all parameters are literal values.</li>
  </ul>

  The following options can enable some additional optimizations:

  <ul>
    <li>The type of the <code>Feature</code> instances to be filtered.</li>
  </ul>

  <h2>Usage in multi-threads context</h2>
  This class is <strong>not</strong> thread-safe.
  A new instance shall be created for each thread applying optimizations. Example:

  <blockquote><pre>Filter&lt;R&gt; filter = ...;
 filter = <font color="green">new</font> <b>Optimization</b>().<b>apply</b>(filter);</pre></blockquote>

  <h2>How optimizations are applied</h2>
  Optimizations are specific to each expression and filter type.
  For optimizations to happen, classes must implement the <a href="Optimization.OnExpression.html" title="interface in org.apache.sis.filter"><code>Optimization.OnExpression</code></a> or <a href="Optimization.OnFilter.html" title="interface in org.apache.sis.filter"><code>Optimization.OnFilter</code></a> interface.
  The <a href="#apply(org.apache.sis.filter.Filter)"><code>apply(Filter)</code></a> and <a href="#apply(org.apache.sis.filter.Expression)"><code>apply(Expression)</code></a> methods in this <code>Optimization</code> class merely
  delegate to the methods defined in above-cited interfaces, with safety guards against infinite recursivity.

  <h2>Behavioral changes</h2>
  Optimized filters shall produce the same results than non-optimized filters.
  However side-effects may differ, in particular regarding exceptions that may be thrown.
  For example if a filter tests <code>A &amp; B</code> and if <code>Optimization</code> determines that the <code>B</code>
  condition will always evaluate to <code>false</code>, then the <code>A</code> condition will never be tested.
  If that condition had side-effects or threw an exception,
  those effects will disappear in the optimized filter.</div>
 <dl class="notes">
 <dt>Since:</dt>
 <dd>1.1</dd>

 <p><font size="-1">Defined in the <code>sis-feature</code> module</font></p>
 </dl>
 </section>
 <section class="summary">
 <ul class="summary-list">
 <!-- ======== NESTED CLASS SUMMARY ======== -->
 <li>
 <section class="nested-class-summary" id="nested-class-summary">
 <h2>Nested Class Summary</h2>
 <div class="caption"><span>Nested Classes</span></div>
 <div class="summary-table three-column-summary">
 <div class="table-header col-first">Modifier and Type</div>
 <div class="table-header col-second">Class</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color"><code>static interface&nbsp;</code></div>
 <div class="col-second even-row-color"><code><a href="Optimization.OnExpression.html" class="type-name-link" title="interface in org.apache.sis.filter">Optimization.OnExpression</a>&lt;<a href="Optimization.OnExpression.html" title="type parameter in Optimization.OnExpression">R</a>,<wbr><a href="Optimization.OnExpression.html" title="type parameter in Optimization.OnExpression">V</a>&gt;</code></div>
 <div class="col-last even-row-color">
 <div class="block">Expression that can be optimized.</div>
 </div>
 <div class="col-first odd-row-color"><code>static interface&nbsp;</code></div>
 <div class="col-second odd-row-color"><code><a href="Optimization.OnFilter.html" class="type-name-link" title="interface in org.apache.sis.filter">Optimization.OnFilter</a>&lt;<a href="Optimization.OnFilter.html" title="type parameter in Optimization.OnFilter">R</a>&gt;</code></div>
 <div class="col-last odd-row-color">
 <div class="block">Filter that can be optimized.</div>
 </div>
 </div>
 </section>
 </li>
 <!-- ======== CONSTRUCTOR SUMMARY ======== -->
 <li>
 <section class="constructor-summary" id="constructor-summary">
 <h2>Constructor Summary</h2>
 <div class="caption"><span>Constructors</span></div>
 <div class="summary-table two-column-summary">
 <div class="table-header col-first">Constructor</div>
 <div class="table-header col-last">Description</div>
 <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">Optimization</a>()</code></div>
 <div class="col-last even-row-color">
 <div class="block">Creates a new instance.</div>
 </div>
 </div>
 </section>
 </li>
 <!-- ========== METHOD SUMMARY =========== -->
 <li>
 <section class="method-summary" id="method-summary">
 <h2>Method Summary</h2>
 <div id="method-summary-table">
 <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
 <div id="method-summary-table.tabpanel" role="tabpanel">
 <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
 <div class="table-header col-first">Modifier and Type</div>
 <div class="table-header col-second">Method</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>&lt;R,<wbr>
 V&gt;&nbsp;<a href="Expression.html" title="interface in org.apache.sis.filter">Expression</a>&lt;? super R,<wbr>? extends V&gt;</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#apply(org.apache.sis.filter.Expression)" class="member-name-link">apply</a><wbr>(<a href="Expression.html" title="interface in org.apache.sis.filter">Expression</a>&lt;R,<wbr>V&gt;&nbsp;expression)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Optimizes or simplifies the given expression.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>&lt;R&gt;&nbsp;<a href="Filter.html" title="interface in org.apache.sis.filter">Filter</a>&lt;? super R&gt;</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#apply(org.apache.sis.filter.Filter)" class="member-name-link">apply</a><wbr>(<a href="Filter.html" title="interface in org.apache.sis.filter">Filter</a>&lt;R&gt;&nbsp;filter)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Optimizes or simplifies the given filter.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>&lt;R&gt;&nbsp;<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="Filter.html" title="interface in org.apache.sis.filter">Filter</a>&lt;? super R&gt;&gt;</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#applyAndDecompose(org.apache.sis.filter.Filter)" class="member-name-link">applyAndDecompose</a><wbr>(<a href="Filter.html" title="interface in org.apache.sis.filter">Filter</a>&lt;R&gt;&nbsp;filter)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Optimizes or simplifies the given filter and returns it as a list of <code>AND</code> operands.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../feature/DefaultFeatureType.html" title="class in org.apache.sis.feature">DefaultFeatureType</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getFeatureType()" class="member-name-link">getFeatureType</a>()</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns the type of feature instances to be filtered, or <code>null</code> if unknown.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static &lt;R,<wbr>
 V&gt;&nbsp;<a href="Expression.html" title="interface in org.apache.sis.filter">Expression</a>&lt;R,<wbr>V&gt;</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#literal(V)" class="member-name-link">literal</a><wbr>(V&nbsp;value)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Creates a constant, literal value that can be used in expressions.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#setFeatureType(org.apache.sis.feature.DefaultFeatureType)" class="member-name-link">setFeatureType</a><wbr>(<a href="../feature/DefaultFeatureType.html" title="class in org.apache.sis.feature">DefaultFeatureType</a>&nbsp;type)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Sets the type of feature instances to be filtered.</div>
 </div>
 </div>
 </div>
 </div>
 <div class="inherited-list">
 <h3 id="methods-inherited-from-class-Object">Methods inherited from class&nbsp;<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
 <code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
 </section>
 </li>
 </ul>
 </section>
 <section class="details">
 <ul class="details-list">
 <!-- ========= CONSTRUCTOR DETAIL ======== -->
 <li>
 <section class="constructor-details" id="constructor-detail">
 <h2>Constructor Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="&lt;init&gt;()">
 <h3>Optimization</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">Optimization</span>()</div>
 <div class="block">Creates a new instance.</div>
 </section>
 </li>
 </ul>
 </section>
 </li>
 <!-- ============ METHOD DETAIL ========== -->
 <li>
 <section class="method-details" id="method-detail">
 <h2>Method Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="getFeatureType()">
 <h3>getFeatureType</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="../feature/DefaultFeatureType.html" title="class in org.apache.sis.feature">DefaultFeatureType</a></span>&nbsp;<span class="element-name">getFeatureType</span>()</div>
 <div class="block">Returns the type of feature instances to be filtered, or <code>null</code> if unknown.
  This is the last value specified by a call to <a href="#setFeatureType(org.apache.sis.feature.DefaultFeatureType)"><code>setFeatureType(DefaultFeatureType)</code></a>.
  The default value is <code>null</code>.</div>
 <dl class="notes">
 <dt>Returns:</dt>
 <dd>the type of feature instances to be filtered, or <code>null</code> if unknown.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="setFeatureType(org.apache.sis.feature.DefaultFeatureType)">
 <h3>setFeatureType</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">setFeatureType</span><wbr><span class="parameters">(<a href="../feature/DefaultFeatureType.html" title="class in org.apache.sis.feature">DefaultFeatureType</a>&nbsp;type)</span></div>
 <div class="block">Sets the type of feature instances to be filtered.
  If this type is known in advance, specifying it may allow to compute more specific
  <a href="../util/ObjectConverter.html" title="interface in org.apache.sis.util"><code>ObjectConverter</code></a>s or to apply some geometry reprojection
  in advance.</div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>type</code> - the type of feature instances to be filtered, or <code>null</code> if unknown.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="apply(org.apache.sis.filter.Filter)">
 <h3>apply</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="type-parameters">&lt;R&gt;</span>&nbsp;<span class="return-type"><a href="Filter.html" title="interface in org.apache.sis.filter">Filter</a>&lt;? super R&gt;</span>&nbsp;<span class="element-name">apply</span><wbr><span class="parameters">(<a href="Filter.html" title="interface in org.apache.sis.filter">Filter</a>&lt;R&gt;&nbsp;filter)</span></div>
 <div class="block">Optimizes or simplifies the given filter. If the given instance implements the <a href="Optimization.OnFilter.html" title="interface in org.apache.sis.filter"><code>Optimization.OnFilter</code></a> interface,
  then its <code>optimize(this)</code> method is invoked. Otherwise this method returns the given filter as-is.</div>
 <dl class="notes">
 <dt>Type Parameters:</dt>
 <dd><code>R</code> - the type of resources (e.g. <code>Feature</code>) used as inputs.</dd>
 <dt>Parameters:</dt>
 <dd><code>filter</code> - the filter to optimize, or <code>null</code>.</dd>
 <dt>Returns:</dt>
 <dd>the optimized filter, or <code>null</code> if the given filter was null.
          May be <code>filter</code> if no optimization or simplification has been applied.</dd>
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if the given filter is already in process of being optimized
          (i.e. there is a recursive call to <code>apply(…)</code> for the same filter).</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="apply(org.apache.sis.filter.Expression)">
 <h3>apply</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="type-parameters">&lt;R,<wbr>
 V&gt;</span>&nbsp;<span class="return-type"><a href="Expression.html" title="interface in org.apache.sis.filter">Expression</a>&lt;? super R,<wbr>? extends V&gt;</span>&nbsp;<span class="element-name">apply</span><wbr><span class="parameters">(<a href="Expression.html" title="interface in org.apache.sis.filter">Expression</a>&lt;R,<wbr>V&gt;&nbsp;expression)</span></div>
 <div class="block">Optimizes or simplifies the given expression. If the given instance implements the <a href="Optimization.OnExpression.html" title="interface in org.apache.sis.filter"><code>Optimization.OnExpression</code></a>
  interface, then its <code>optimize(this)</code> method is invoked. Otherwise this method returns the given
  expression as-is.</div>
 <dl class="notes">
 <dt>Type Parameters:</dt>
 <dd><code>R</code> - the type of resources (e.g. <code>Feature</code>) used as inputs.</dd>
 <dd><code>V</code> - the type of values computed by the expression.</dd>
 <dt>Parameters:</dt>
 <dd><code>expression</code> - the expression to optimize, or <code>null</code>.</dd>
 <dt>Returns:</dt>
 <dd>the optimized expression, or <code>null</code> if the given expression was null.
          May be <code>expression</code> if no optimization or simplification has been applied.</dd>
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if the given expression is already in process of being optimized
          (i.e. there is a recursive call to <code>apply(…)</code> for the same expression).</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="applyAndDecompose(org.apache.sis.filter.Filter)">
 <h3>applyAndDecompose</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="type-parameters">&lt;R&gt;</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="Filter.html" title="interface in org.apache.sis.filter">Filter</a>&lt;? super R&gt;&gt;</span>&nbsp;<span class="element-name">applyAndDecompose</span><wbr><span class="parameters">(<a href="Filter.html" title="interface in org.apache.sis.filter">Filter</a>&lt;R&gt;&nbsp;filter)</span></div>
 <div class="block">Optimizes or simplifies the given filter and returns it as a list of <code>AND</code> operands.
  If such list cannot be built, then this method returns the optimized filter in a singleton list.

  <h4>Use case</h4>
  This method tries to transform a filter into a <code>F₀ AND F₁ AND F₂ AND F₃ AND ...</code> sequence.
  This transformation is useful when some operands can be handled by the storage engine
  (for example a SQL database) and other operands cannot.
  For example, when reading features from a relational database,
  the implementation may choose to express the F₁ and F₃ operands as SQL statements
  and apply the other operands in Java code.</div>
 <dl class="notes">
 <dt>Type Parameters:</dt>
 <dd><code>R</code> - the type of resources (e.g. <code>Feature</code>) used as inputs.</dd>
 <dt>Parameters:</dt>
 <dd><code>filter</code> - the filter to decompose.</dd>
 <dt>Returns:</dt>
 <dd>a sequence of <code>AND</code> operands, or an empty list if the given filter was null.</dd>
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/ClassCastException.html" title="class or interface in java.lang" class="external-link">ClassCastException</a></code> - if a filter declares the <code>AND</code>, <code>OR</code> or <code>NOT</code> type
          without implementing the <code>LogicalOperator</code> interface.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="literal(V)">
 <h3 id="literal(java.lang.Object)">literal</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="type-parameters">&lt;R,<wbr>
 V&gt;</span>&nbsp;<span class="return-type"><a href="Expression.html" title="interface in org.apache.sis.filter">Expression</a>&lt;R,<wbr>V&gt;</span>&nbsp;<span class="element-name">literal</span><wbr><span class="parameters">(V&nbsp;value)</span></div>
 <div class="block">Creates a constant, literal value that can be used in expressions.
  This is a helper methods for optimizations which simplified an expression to a constant value.</div>
 <dl class="notes">
 <dt>Type Parameters:</dt>
 <dd><code>R</code> - the type of resources used as inputs.</dd>
 <dd><code>V</code> - the type of the value of the literal.</dd>
 <dt>Parameters:</dt>
 <dd><code>value</code> - the literal value. May be <code>null</code>.</dd>
 <dt>Returns:</dt>
 <dd>a literal for the given value.</dd>
 <dt>See Also:</dt>
 <dd>
 <ul class="see-list-long">
 <li><a href="DefaultFilterFactory.html#literal(V)"><code>DefaultFilterFactory.literal(Object)</code></a></li>
 </ul>
 </dd>
 </dl>
 </section>
 </li>
 </ul>
 </section>
 </li>
 </ul>
 </section>
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