doc-fr/reference/spl/seekableiterator.xml

<?xml version="1.0" encoding="utf-8"?>
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<!-- EN-Revision: c80e398bcb1f060d16de768e46933d1a09f2de65 Maintainer: yannick Status: ready -->
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<phpdoc:classref xml:id="class.seekableiterator" xmlns:phpdoc="http://php.net/ns/phpdoc" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">

 <title>L'interface <classname>SeekableIterator</classname></title>
 <titleabbrev>SeekableIterator</titleabbrev>

 <partintro>

<!-- {{{ SeekableIterator intro -->
  <section xml:id="seekableiterator.intro">
   &reftitle.intro;
   <para>
    L'itérateur <classname>SeekableIterator</classname>.
   </para>
  </section>
<!-- }}} -->

  <section xml:id="seekableiterator.synopsis">
   &reftitle.interfacesynopsis;

<!-- {{{ Synopsis -->
   <classsynopsis>
    <ooclass>
     <classname>SeekableIterator</classname>
    </ooclass>

    <classsynopsisinfo>
     <oointerface>
      <interfacename>SeekableIterator</interfacename>
     </oointerface>

     <ooclass>
      <modifier>extends</modifier>
      <classname>Iterator</classname>
     </ooclass>
    </classsynopsisinfo>

    <classsynopsisinfo role="comment">&Methods;</classsynopsisinfo>
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.seekableiterator')/db:refentry/db:refsect1[@role='description']/descendant::db:methodsynopsis[not(@role='procedural')])">
     <xi:fallback/>
    </xi:include>

    <classsynopsisinfo role="comment">&InheritedMethods;</classsynopsisinfo>
    <xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('class.iterator')/db:refentry/db:refsect1[@role='description']/descendant::db:methodsynopsis[not(@role='procedural')])">
     <xi:fallback/>
    </xi:include>
   </classsynopsis>
<!-- }}} -->

  </section>

  <section xml:id="seekableiterator.examples">
   <example xml:id="seekableiterator.examples.basic"><!-- {{{ -->
    <title>Utilisation simple</title>
    <para>
     Cet exemple montre comment crée une classe 
     <classname>SeekableIterator</classname> personnalisée, 
     qui gère une position invalide.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
class MySeekableIterator implements SeekableIterator {

    private $position;

    private $array = array(
        "premier élément",
        "second élément",
        "troisième élément",
        "quatriéme élément"
    );

    /* Méthode requis pour l'interface SeekableIterator */

    public function seek($position) {
      if (!isset($this->array[$position])) {
          throw new OutOfBoundsException("position invalide ($position)");
      }

      $this->position = $position;
    }

    /* Méthodes requises par l'interface Iterator */
    
    public function rewind() {
        $this->position = 0;
    }

    public function current() {
        return $this->array[$this->position];
    }

    public function key() {
        return $this->position;
    }

    public function next() {
        ++$this->position;
    }

    public function valid() {
        return isset($this->array[$this->position]);
    }
}

try {

    $it = new MySeekableIterator;
    echo $it->current(), "\n";
    
    $it->seek(2);
    echo $it->current(), "\n";
    
    $it->seek(1);
    echo $it->current(), "\n";
    
    $it->seek(10);
    
} catch (OutOfBoundsException $e) {
    echo $e->getMessage();
}
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
premier élément
troisième élément
second élément
position invalide (10)
]]>
    </screen>
   </example><!-- }}} -->
  </section>

 </partintro>

 &reference.spl.entities.seekableiterator;

</phpdoc:classref>
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