archived-doc-es/reference/spl/seekableiterator.xml

<?xml version="1.0" encoding="utf-8"?>
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<reference xml:id="class.seekableiterator" role="class" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">

 <title>The SeekableIterator interface</title>
 <titleabbrev>SeekableIterator</titleabbrev>

 <partintro>

  <!-- {{{ SeekableIterator intro -->
  <section xml:id="seekableiterator.intro">
   &reftitle.intro;
   <para>
    El iterador Seekable.
   </para>
  </section>
  <!-- }}} -->

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

   <!-- {{{ Synopsis -->
   <classsynopsis class="interface">
    <oointerface>
     <interfacename>SeekableIterator</interfacename>
    </oointerface>

    <oointerface>
     <modifier>extends</modifier>
     <interfacename>Iterator</interfacename>
    </oointerface>

    <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[@role='SeekableIterator'])">
     <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[@role='Iterator'])">
     <xi:fallback/>
    </xi:include>
   </classsynopsis>
   <!-- }}} -->

  </section>

  <section xml:id="seekableiterator.examples">
   &reftitle.examples;
   <example xml:id="seekableiterator.examples.basic"><!-- {{{ -->
    <title>Uso básico</title>
    <para>
     Este ejemplo muestra cómo crear un <classname>SeekableIterator</classname> personalizado,
     buscar una posición y manejar una posición inválida.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
class MySeekableIterator implements SeekableIterator {

    private $position;

    private $array = array(
        "first element",
        "second element",
        "third element",
        "fourth element"
    );

    /* Métodos requeridos para la interfaz SeekableIterator */

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

      $this->position = $position;
    }

    /* Métodos requeridos para la interfaz Iterador */

    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[
first element
third element
second element
invalid seek position (10)
]]>
    </screen>
   </example><!-- }}} -->
  </section>

 </partintro>

 &reference.spl.entities.seekableiterator;

</reference>
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