org.apache.sis.feature/org/apache/sis/feature/FeatureOperations.html - sis-site - Git at Google

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 <div class="sub-title"><span class="module-label-in-type">Module</span>&nbsp;<a href="../../../../module-summary.html">org.apache.sis.feature</a></div>
 <div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.sis.feature</a></div>
 <h1 title="Class FeatureOperations" class="title">Class FeatureOperations</h1>
 </div>
 <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>
 <div class="inheritance"><a href="../../../../../org.apache.sis.util/org/apache/sis/util/Static.html" title="class in org.apache.sis.util">Static</a>
 <div class="inheritance">FeatureOperations</div>
 </div>
 </div>
 <section class="class-description" id="class-description">
 <hr>
 <div class="type-signature"><span class="modifiers">public final class </span><span class="element-name type-name-label">FeatureOperations</span>
 <span class="extends-implements">extends <a href="../../../../../org.apache.sis.util/org/apache/sis/util/Static.html" title="class in org.apache.sis.util">Static</a></span></div>
 <div class="block">A set of predefined operations expecting a <code>Feature</code> as input and producing an <code>Attribute</code> as output.
  Those operations can be used for creating <cite>dynamic properties</cite> which compute their value on-the-fly
  from the values of other properties.

  <p>A flexible but relatively cumbersome way to define arbitrary computations is to subclass <a href="AbstractOperation.html" title="class in org.apache.sis.feature"><code>AbstractOperation</code></a>.
  This <code>FeatureOperations</code> class provides a more convenient way to get a few commonly-used operations.</p>

  <h2 id="operation-name-designation-and-description-heading">Operation name, designation and description</h2>
  All operations are identified by a programmatic name, but can also have a more human-readable designation
  for Graphical User Interfaces (GUI). Those identification information are specified in a <code>Map&lt;String,?&gt;</code>.
  The recognized entries are the same than the ones documented in <a href="AbstractIdentifiedType.html" title="class in org.apache.sis.feature"><code>AbstractIdentifiedType</code></a>, augmented with
  entries that describe the operation <em>result</em>. Those entries are summarized below:

  <table class="sis">
    <caption>Recognized map entries</caption>
    <tr>
      <th>Map key</th>
      <th>Value type</th>
      <th>Returned by</th>
    </tr>
    <tr>
      <td><a href="AbstractIdentifiedType.html#NAME_KEY">"name"</a></td>
      <td><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/GenericName.html" title="class or interface in org.opengis.util" class="external-link"><code>GenericName</code></a> or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link"><code>String</code></a></td>
      <td><a href="AbstractIdentifiedType.html#getName()"><code>Operation.getName()</code></a> (mandatory)</td>
    </tr>
    <tr>
      <td><a href="AbstractIdentifiedType.html#DEFINITION_KEY">"definition"</a></td>
      <td><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/InternationalString.html" title="class or interface in org.opengis.util" class="external-link"><code>InternationalString</code></a> or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link"><code>String</code></a></td>
      <td><a href="AbstractIdentifiedType.html#getDefinition()"><code>Operation.getDefinition()</code></a></td>
    </tr>
    <tr>
      <td><a href="AbstractIdentifiedType.html#DESIGNATION_KEY">"designation"</a></td>
      <td><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/InternationalString.html" title="class or interface in org.opengis.util" class="external-link"><code>InternationalString</code></a> or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link"><code>String</code></a></td>
      <td><a href="AbstractIdentifiedType.html#getDesignation()"><code>Operation.getDesignation()</code></a></td>
    </tr>
    <tr>
      <td><a href="AbstractIdentifiedType.html#DESCRIPTION_KEY">"description"</a></td>
      <td><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/InternationalString.html" title="class or interface in org.opengis.util" class="external-link"><code>InternationalString</code></a> or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link"><code>String</code></a></td>
      <td><a href="AbstractIdentifiedType.html#getDescription()"><code>Operation.getDescription()</code></a></td>
    </tr>
    <tr>
      <td>"result.name"</td>
      <td><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/GenericName.html" title="class or interface in org.opengis.util" class="external-link"><code>GenericName</code></a> or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link"><code>String</code></a></td>
      <td><a href="AbstractAttribute.html#getName()"><code>Attribute.getName()</code></a> on the <a href="AbstractOperation.html#getResult()">result</a></td>
    </tr>
    <tr>
      <td>"result.definition"</td>
      <td><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/InternationalString.html" title="class or interface in org.opengis.util" class="external-link"><code>InternationalString</code></a> or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link"><code>String</code></a></td>
      <td><a href="AbstractIdentifiedType.html#getDefinition()"><code>Attribute.getDefinition()</code></a> on the <a href="AbstractOperation.html#getResult()">result</a></td>
    </tr>
    <tr>
      <td>"result.designation"</td>
      <td><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/InternationalString.html" title="class or interface in org.opengis.util" class="external-link"><code>InternationalString</code></a> or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link"><code>String</code></a></td>
      <td><a href="AbstractIdentifiedType.html#getDesignation()"><code>Attribute.getDesignation()</code></a> on the <a href="AbstractOperation.html#getResult()">result</a></td>
    </tr>
    <tr>
      <td>"result.description"</td>
      <td><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/InternationalString.html" title="class or interface in org.opengis.util" class="external-link"><code>InternationalString</code></a> or <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link"><code>String</code></a></td>
      <td><a href="AbstractIdentifiedType.html#getDescription()"><code>Attribute.getDescription()</code></a> on the <a href="AbstractOperation.html#getResult()">result</a></td>
    </tr>
    <tr>
      <td><a href="../../../../../org.apache.sis.referencing/org/apache/sis/referencing/AbstractIdentifiedObject.html#LOCALE_KEY">"locale"</a></td>
      <td><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Locale.html" title="class or interface in java.util" class="external-link"><code>Locale</code></a></td>
      <td>(none)</td>
    </tr>
  </table>

  If no <code>"result.*"</code> entry is provided, then the methods in this class will use some default name, designation
  and other information for the result type. Those defaults are operation specific; they are often, but not necessarily,
  the same than the operation name, designation, <i>etc.</i></div>
 <dl class="notes">
 <dt>Since:</dt>
 <dd>0.7</dd>
 </dl>
 </section>
 <section class="summary">
 <ul class="summary-list">
 <!-- ========== 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-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>
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 <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-tab1 method-summary-table-tab4"><code>static <a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#compound(java.util.Map,java.lang.String,java.lang.String,java.lang.String,org.apache.sis.feature.AbstractIdentifiedType...)" class="member-name-link">compound</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;delimiter,
  <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;prefix,
  <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;suffix,
  <a href="AbstractIdentifiedType.html" title="class in org.apache.sis.feature">AbstractIdentifiedType</a>...&nbsp;singleAttributes)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Creates an operation concatenating the string representations of the values of multiple properties.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#envelope(java.util.Map,org.opengis.referencing.crs.CoordinateReferenceSystem,org.apache.sis.feature.AbstractIdentifiedType...)" class="member-name-link">envelope</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/referencing/crs/CoordinateReferenceSystem.html" title="class or interface in org.opengis.referencing.crs" class="external-link">CoordinateReferenceSystem</a>&nbsp;crs,
  <a href="AbstractIdentifiedType.html" title="class in org.apache.sis.feature">AbstractIdentifiedType</a>...&nbsp;geometryAttributes)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Creates an operation computing the envelope that encompass all geometries found in the given attributes.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static &lt;V&gt;&nbsp;<a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#expression(java.util.Map,org.apache.sis.filter.Expression,org.apache.sis.feature.DefaultAttributeType)" class="member-name-link">expression</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="../filter/Expression.html" title="interface in org.apache.sis.filter">Expression</a>&lt;? super <a href="AbstractFeature.html" title="class in org.apache.sis.feature">AbstractFeature</a>,<wbr>?&gt;&nbsp;expression,
  <a href="DefaultAttributeType.html" title="class in org.apache.sis.feature">DefaultAttributeType</a>&lt;V&gt;&nbsp;resultType)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Creates an operation which delegates the computation to a given expression producing values of unknown type.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static &lt;V&gt;&nbsp;<a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#function(java.util.Map,java.util.function.Function,org.apache.sis.feature.DefaultAttributeType)" class="member-name-link">function</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/function/Function.html" title="class or interface in java.util.function" class="external-link">Function</a>&lt;? super <a href="AbstractFeature.html" title="class in org.apache.sis.feature">AbstractFeature</a>,<wbr>? extends V&gt;&nbsp;expression,
  <a href="DefaultAttributeType.html" title="class in org.apache.sis.feature">DefaultAttributeType</a>&lt;? super V&gt;&nbsp;resultType)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Creates an operation which delegates the computation to a given expression.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#groupAsPolyline(java.util.Map,org.apache.sis.setup.GeometryLibrary,org.apache.sis.feature.AbstractIdentifiedType)" class="member-name-link">groupAsPolyline</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="../../../../../org.apache.sis.util/org/apache/sis/setup/GeometryLibrary.html" title="enum class in org.apache.sis.setup">GeometryLibrary</a>&nbsp;library,
  <a href="AbstractIdentifiedType.html" title="class in org.apache.sis.feature">AbstractIdentifiedType</a>&nbsp;components)</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 single geometry from a sequence of points or polylines stored in another property.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#link(java.util.Map,org.apache.sis.feature.AbstractIdentifiedType)" class="member-name-link">link</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="AbstractIdentifiedType.html" title="class in org.apache.sis.feature">AbstractIdentifiedType</a>&nbsp;referent)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
 <div class="block">Creates an operation which is only an alias for another property.</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/11/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/11/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/11/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/11/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/11/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/11/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/11/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/11/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/11/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/11/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/11/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/11/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">
 <!-- ============ METHOD DETAIL ========== -->
 <li>
 <section class="method-details" id="method-detail">
 <h2>Method Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="link(java.util.Map,org.apache.sis.feature.AbstractIdentifiedType)">
 <h3>link</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></span>&nbsp;<span class="element-name">link</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="AbstractIdentifiedType.html" title="class in org.apache.sis.feature">AbstractIdentifiedType</a>&nbsp;referent)</span></div>
 <div class="block">Creates an operation which is only an alias for another property.

  <h4 id="example-heading">Example</h4>
  Features often have a property that can be used as identifier or primary key.
  But the name of that property may vary between features of different types.
  For example, features of type <b>Country</b> may have identifiers named “ISO country code”
  while features of type <b>Car</b> may have identifiers named “license plate number”.
  In order to simplify identifier usages regardless of their name,
  an application could choose to add in all features a virtual property named <code>"identifier"</code>
  which links to whatever property is used as an identifier in an arbitrary feature.
  So the definition of the <b>Car</b> feature could contain the following code:


 <div class="snippet-container"><button class="copy snippet-copy" aria-label="Copy snippet" onclick="copySnippet(this)"><span data-copied="Copied!">Copy</span><img src="../../../../../copy.svg" alt="Copy snippet"></button>
 <pre class="snippet"><code class="language-java">AttributeType licensePlateNumber = ...;            // Attribute creation omitted for brevity
 FeatureType car = new DefaultFeatureType(...,      // Arguments omitted for brevity
         licensePlateNumber, model, owner,
         FeatureOperations.link(Map.of(NAME_KEY, "identifier"), licensePlateNumber);
 </code></pre>
 </div>


  Since this method does not create new property (it only redirects to an existing property),
  this method ignores all <code>"result.*"</code> entries in the given <code>identification</code> map.

  <h4 id="read-write-behavior-heading">Read/write behavior</h4>
  Since the <a href="AbstractOperation.html#apply(org.apache.sis.feature.AbstractFeature,org.opengis.parameter.ParameterValueGroup)"><code>Operation.apply(…)</code></a> method returns directly the property
  identified by the <code>referent</code> argument, the returned property is writable if the referenced
  property is also writable.

  <div class="warning"><b>Warning:</b>
  The type of <code>referent</code> parameter will be changed to <code>PropertyType</code>
  if and when such interface will be defined in GeoAPI.</div></div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>identification</code> - the name and other information to be given to the operation.</dd>
 <dd><code>referent</code> - the referenced attribute or feature association.</dd>
 <dt>Returns:</dt>
 <dd>an operation which is an alias for the <code>referent</code> property.</dd>
 <dt>See Also:</dt>
 <dd>
 <ul class="tag-list-long">
 <li><a href="Features.html#getLinkTarget(org.apache.sis.feature.AbstractIdentifiedType)"><code>Features.getLinkTarget(PropertyType)</code></a></li>
 </ul>
 </dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="compound(java.util.Map,java.lang.String,java.lang.String,java.lang.String,org.apache.sis.feature.AbstractIdentifiedType...)">
 <h3>compound</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></span>&nbsp;<span class="element-name">compound</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;delimiter,
  <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;prefix,
  <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;suffix,
  <a href="AbstractIdentifiedType.html" title="class in org.apache.sis.feature">AbstractIdentifiedType</a>...&nbsp;singleAttributes)</span>
                                   throws <span class="exceptions"><a href="../../../../../org.apache.sis.util/org/apache/sis/util/UnconvertibleObjectException.html" title="class in org.apache.sis.util">UnconvertibleObjectException</a></span></div>
 <div class="block">Creates an operation concatenating the string representations of the values of multiple properties.
  This operation can be used for creating a <cite>compound key</cite> as a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link"><code>String</code></a> that consists
  of two or more attribute values that uniquely identify a feature instance.

  <p>The <code>delimiter</code>, <code>prefix</code> and <code>suffix</code> arguments given to this method
  are used in the same way than <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/StringJoiner.html" title="class or interface in java.util" class="external-link"><code>StringJoiner</code></a>, except for null values.
  Null prefix, suffix and property values are handled as if they were empty strings.</p>

  <p>If the same character sequences than the given delimiter appears in a property value,
  the <code>'\'</code> escape character will be inserted before that sequence.
  If the <code>'\'</code> character appears in a property value, it will be doubled.</p>

  <h4 id="restrictions-heading">Restrictions</h4>
  <ul>
    <li>The single properties can be either attributes or operations that produce attributes;
        feature associations are not allowed, unless they have an <code>"sis:identifier"</code> property.</li>
    <li>Each attribute shall contain at most one value; multi-valued attributes are not allowed.</li>
    <li>The delimiter cannot contain the <code>'\'</code> escape character.</li>
  </ul>

  <h4 id="read-write-behavior-heading1">Read/write behavior</h4>
  This operation supports both reading and writing. When setting a value on the attribute created by this
  operation, the given string value will be split around the <code>delimiter</code> and each substring will be
  forwarded to the corresponding single property.

  <div class="warning"><b>Warning:</b>
  The type of <code>singleAttributes</code> elements will be changed to <code>PropertyType</code>
  if and when such interface will be defined in GeoAPI.</div></div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>identification</code> - the name and other information to be given to the operation.</dd>
 <dd><code>delimiter</code> - the characters to use as delimiter between each single property value.</dd>
 <dd><code>prefix</code> - characters to use at the beginning of the concatenated string, or <code>null</code> if none.</dd>
 <dd><code>suffix</code> - characters to use at the end of the concatenated string, or <code>null</code> if none.</dd>
 <dd><code>singleAttributes</code> - identification of the single attributes (or operations producing attributes) to concatenate.</dd>
 <dt>Returns:</dt>
 <dd>an operation which concatenates the string representations of all referenced single property values.</dd>
 <dt>Throws:</dt>
 <dd><code><a href="../../../../../org.apache.sis.util/org/apache/sis/util/UnconvertibleObjectException.html" title="class in org.apache.sis.util">UnconvertibleObjectException</a></code> - if at least one of the given <code>singleAttributes</code> uses a
          <a href="DefaultAttributeType.html#getValueClass()">value class</a> which is not convertible from a <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link"><code>String</code></a>.</dd>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if <code>singleAttributes</code> is an empty sequence, or contains a property which
          is neither an <code>AttributeType</code> or an <code>Operation</code> computing an attribute, or an attribute has
          a <a href="DefaultAttributeType.html#getMaximumOccurs()">maximum number of occurrences</a> greater than 1.</dd>
 <dt>See Also:</dt>
 <dd>
 <ul class="tag-list">
 <li><a href="https://en.wikipedia.org/wiki/Compound_key">Compound key on Wikipedia</a></li>
 </ul>
 </dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="envelope(java.util.Map,org.opengis.referencing.crs.CoordinateReferenceSystem,org.apache.sis.feature.AbstractIdentifiedType...)">
 <h3>envelope</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></span>&nbsp;<span class="element-name">envelope</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/referencing/crs/CoordinateReferenceSystem.html" title="class or interface in org.opengis.referencing.crs" class="external-link">CoordinateReferenceSystem</a>&nbsp;crs,
  <a href="AbstractIdentifiedType.html" title="class in org.apache.sis.feature">AbstractIdentifiedType</a>...&nbsp;geometryAttributes)</span>
                                   throws <span class="exceptions"><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/FactoryException.html" title="class or interface in org.opengis.util" class="external-link">FactoryException</a></span></div>
 <div class="block">Creates an operation computing the envelope that encompass all geometries found in the given attributes.
  Geometries can be in different coordinate reference systems; they will be transformed to the first non-null
  CRS in the following choices:

  <ol>
    <li>the CRS specified to this method,</li>
    <li>the CRS of the default geometry, or</li>
    <li>the CRS of the first non-empty geometry.</li>
  </ol>

  The <a href="AbstractOperation.html#getResult()">result</a> of this operation is an <code>Attribute</code>
  with values of type <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/geometry/Envelope.html" title="class or interface in org.opengis.geometry" class="external-link"><code>Envelope</code></a>. If the <code>crs</code> argument given to
  this method is non-null, then the
  <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/geometry/Envelope.html#getCoordinateReferenceSystem()" title="class or interface in org.opengis.geometry" class="external-link">envelope CRS</a>
  will be that CRS.

  <h4 id="limitations-heading">Limitations</h4>
  If a geometry contains other geometries, this operation queries only the envelope of the root geometry.
  It is the root geometry responsibility to take in account the envelope of all its children.

  <h4 id="read-write-behavior-heading2">Read/write behavior</h4>
  This operation is read-only. Calls to <code>Attribute.setValue(Envelope)</code> will result in an
  <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/UnsupportedOperationException.html" title="class or interface in java.lang" class="external-link"><code>UnsupportedOperationException</code></a> to be thrown.

  <div class="warning"><b>Warning:</b>
  The type of <code>geometryAttributes</code> elements will be changed to <code>PropertyType</code>
  if and when such interface will be defined in GeoAPI.</div></div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>identification</code> - the name and other information to be given to the operation.</dd>
 <dd><code>crs</code> - the Coordinate Reference System in which to express the envelope, or <code>null</code>.</dd>
 <dd><code>geometryAttributes</code> - the operation or attribute type from which to get geometry values.
                              Any element which is <code>null</code> or has a non-geometric value class will be ignored.</dd>
 <dt>Returns:</dt>
 <dd>an operation which will compute the envelope encompassing all geometries in the given attributes.</dd>
 <dt>Throws:</dt>
 <dd><code><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/FactoryException.html" title="class or interface in org.opengis.util" class="external-link">FactoryException</a></code> - if a coordinate operation to the target CRS cannot be created.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="groupAsPolyline(java.util.Map,org.apache.sis.setup.GeometryLibrary,org.apache.sis.feature.AbstractIdentifiedType)">
 <h3>groupAsPolyline</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></span>&nbsp;<span class="element-name">groupAsPolyline</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="../../../../../org.apache.sis.util/org/apache/sis/setup/GeometryLibrary.html" title="enum class in org.apache.sis.setup">GeometryLibrary</a>&nbsp;library,
  <a href="AbstractIdentifiedType.html" title="class in org.apache.sis.feature">AbstractIdentifiedType</a>&nbsp;components)</span></div>
 <div class="block">Creates a single geometry from a sequence of points or polylines stored in another property.
  When evaluated, this operation reads a feature property containing a sequence of <code>Point</code>s or <code>Polyline</code>s.
  Those geometries shall be instances of the specified geometry library (e.g. JTS or ESRI).
  The merged geometry is usually a <code>Polyline</code>,
  unless the sequence of source geometries is empty or contains a single element.
  The merged geometry is re-computed every time that the operation is evaluated.

  <h4 id="examples-heading">Examples</h4>
  <p><i>Polylines created from points:</i>
  a boat that record it's position every hour.
  The input is a list of all positions stored in an attribute with [0 … ∞] multiplicity.
  This operation will extract each position and create a line as a new attribute.</p>

  <p><i>Polylines created from other polylines:</i>
  a boat that record track every hour.
  The input is a list of all tracks stored in an attribute with [0 … ∞] multiplicity.
  This operation will extract each track and create a polyline as a new attribute.</p>

  <h4 id="read-write-behavior-heading3">Read/write behavior</h4>
  This operation is read-only. Calls to <code>Attribute.setValue(…)</code>
  will result in an <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/UnsupportedOperationException.html" title="class or interface in java.lang" class="external-link"><code>UnsupportedOperationException</code></a> to be thrown.</div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>identification</code> - the name of the operation, together with optional information.</dd>
 <dd><code>library</code> - the library providing the implementations of geometry objects to read and write.</dd>
 <dd><code>components</code> - attribute, association or operation providing the geometries to group as a polyline.</dd>
 <dt>Returns:</dt>
 <dd>a feature operation which computes its values by merging points or polylines.</dd>
 <dt>Since:</dt>
 <dd>1.4</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="function(java.util.Map,java.util.function.Function,org.apache.sis.feature.DefaultAttributeType)">
 <h3>function</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="type-parameters">&lt;V&gt;</span>&nbsp;<span class="return-type"><a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></span>&nbsp;<span class="element-name">function</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/function/Function.html" title="class or interface in java.util.function" class="external-link">Function</a>&lt;? super <a href="AbstractFeature.html" title="class in org.apache.sis.feature">AbstractFeature</a>,<wbr>? extends V&gt;&nbsp;expression,
  <a href="DefaultAttributeType.html" title="class in org.apache.sis.feature">DefaultAttributeType</a>&lt;? super V&gt;&nbsp;resultType)</span></div>
 <div class="block">Creates an operation which delegates the computation to a given expression.
  The <code>expression</code> argument should generally be an instance of
  <a href="../filter/Expression.html" title="interface in org.apache.sis.filter"><code>Expression</code></a>,
  but more generic functions are accepted as well.

  <h4 id="read-write-behavior-heading4">Read/write behavior</h4>
  This operation is read-only. Calls to <code>Attribute.setValue(…)</code>
  will result in an <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/UnsupportedOperationException.html" title="class or interface in java.lang" class="external-link"><code>UnsupportedOperationException</code></a> to be thrown.</div>
 <dl class="notes">
 <dt>Type Parameters:</dt>
 <dd><code>V</code> - the type of values computed by the expression and assigned to the feature property.</dd>
 <dt>Parameters:</dt>
 <dd><code>identification</code> - the name of the operation, together with optional information.</dd>
 <dd><code>expression</code> - the expression to evaluate on feature instances.</dd>
 <dd><code>resultType</code> - type of values computed by the expression and assigned to the feature property.</dd>
 <dt>Returns:</dt>
 <dd>a feature operation which computes its values using the given expression.</dd>
 <dt>Since:</dt>
 <dd>1.4</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="expression(java.util.Map,org.apache.sis.filter.Expression,org.apache.sis.feature.DefaultAttributeType)">
 <h3>expression</h3>
 <div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="type-parameters">&lt;V&gt;</span>&nbsp;<span class="return-type"><a href="AbstractOperation.html" title="class in org.apache.sis.feature">AbstractOperation</a></span>&nbsp;<span class="element-name">expression</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr>?&gt;&nbsp;identification,
  <a href="../filter/Expression.html" title="interface in org.apache.sis.filter">Expression</a>&lt;? super <a href="AbstractFeature.html" title="class in org.apache.sis.feature">AbstractFeature</a>,<wbr>?&gt;&nbsp;expression,
  <a href="DefaultAttributeType.html" title="class in org.apache.sis.feature">DefaultAttributeType</a>&lt;V&gt;&nbsp;resultType)</span></div>
 <div class="block">Creates an operation which delegates the computation to a given expression producing values of unknown type.
  This method can be used as an alternative to <a href="#function(java.util.Map,java.util.function.Function,org.apache.sis.feature.DefaultAttributeType)"><code>function(…)</code></a> when the constraint on the
  parameterized type <code>&lt;V&gt;</code> between <code>expression</code> and <code>result</code> cannot be enforced at compile time.
  This method casts or converts the expression to the expected type by a call to
  <a href="../filter/Expression.html#toValueType(java.lang.Class)"><code>Expression.toValueType(Class)</code></a>.

  <h4 id="read-write-behavior-heading5">Read/write behavior</h4>
  This operation is read-only. Calls to <code>Attribute.setValue(…)</code>
  will result in an <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/UnsupportedOperationException.html" title="class or interface in java.lang" class="external-link"><code>UnsupportedOperationException</code></a> to be thrown.</div>
 <dl class="notes">
 <dt>Type Parameters:</dt>
 <dd><code>V</code> - the type of values computed by the expression and assigned to the feature property.</dd>
 <dt>Parameters:</dt>
 <dd><code>identification</code> - the name of the operation, together with optional information.</dd>
 <dd><code>expression</code> - the expression to evaluate on feature instances.</dd>
 <dd><code>resultType</code> - type of values computed by the expression and assigned to the feature property.</dd>
 <dt>Returns:</dt>
 <dd>a feature operation which computes its values using the given expression.</dd>
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/ClassCastException.html" title="class or interface in java.lang" class="external-link">ClassCastException</a></code> - if the result type is not a target type supported by the expression.</dd>
 <dt>Since:</dt>
 <dd>1.4</dd>
 </dl>
 </section>
 </li>
 </ul>
 </section>
 </li>
 </ul>
 </section>
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