--- /dev/null
+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\ORM\Id;
+
+use Serializable, Doctrine\ORM\EntityManager;
+
+/**
+ * Represents an ID generator that uses a database sequence.
+ *
+ * @since 2.0
+ * @author Roman Borschel <roman@code-factory.org>
+ */
+class SequenceGenerator extends AbstractIdGenerator implements Serializable
+{
+ private $_allocationSize;
+ private $_sequenceName;
+ private $_nextValue = 0;
+ private $_maxValue = null;
+
+ /**
+ * Initializes a new sequence generator.
+ *
+ * @param \Doctrine\ORM\EntityManager $em The EntityManager to use.
+ * @param string $sequenceName The name of the sequence.
+ * @param integer $allocationSize The allocation size of the sequence.
+ */
+ public function __construct($sequenceName, $allocationSize)
+ {
+ $this->_sequenceName = $sequenceName;
+ $this->_allocationSize = $allocationSize;
+ }
+
+ /**
+ * Generates an ID for the given entity.
+ *
+ * @param object $entity
+ * @return integer|float The generated value.
+ * @override
+ */
+ public function generate(EntityManager $em, $entity)
+ {
+ if ($this->_maxValue === null || $this->_nextValue == $this->_maxValue) {
+ // Allocate new values
+ $conn = $em->getConnection();
+ $sql = $conn->getDatabasePlatform()->getSequenceNextValSQL($this->_sequenceName);
+
+ $this->_nextValue = (int)$conn->fetchColumn($sql);
+ $this->_maxValue = $this->_nextValue + $this->_allocationSize;
+ }
+
+ return $this->_nextValue++;
+ }
+
+ /**
+ * Gets the maximum value of the currently allocated bag of values.
+ *
+ * @return integer|float
+ */
+ public function getCurrentMaxValue()
+ {
+ return $this->_maxValue;
+ }
+
+ /**
+ * Gets the next value that will be returned by generate().
+ *
+ * @return integer|float
+ */
+ public function getNextValue()
+ {
+ return $this->_nextValue;
+ }
+
+ public function serialize()
+ {
+ return serialize(array(
+ 'allocationSize' => $this->_allocationSize,
+ 'sequenceName' => $this->_sequenceName
+ ));
+ }
+
+ public function unserialize($serialized)
+ {
+ $array = unserialize($serialized);
+
+ $this->_sequenceName = $array['sequenceName'];
+ $this->_allocationSize = $array['allocationSize'];
+ }
+}