1 files changed, 173 insertions, 0 deletions
diff --git a/src/interfaces/dataset_property.php b/src/interfaces/dataset_property.php
new file mode 100644
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--- /dev/null
+++ b/src/interfaces/dataset_property.php
@@ -0,0 +1,173 @@
+<?php
+/**
+ * File containing the abstract ezcGraphDatasetProperty class
+ *
+ * @package Graph
+ * @version $id$
+ * @copyright Copyright (C) 2005, 2006 eZ systems as. All rights reserved.
+ * @license http://ez.no/licenses/new_bsd New BSD License
+ */
+/**
+ * Abstract class for properties of datasets
+ *
+ * @package Graph
+ */
+abstract class ezcGraphDatasetProperty implements ArrayAccess
+{
+    /**
+     * Default value for this property
+     * 
+     * @var mixed
+     */
+    protected $defaultValue;
+
+    /**
+     * Contains specified values for single dataset elements
+     * 
+     * @var array
+     */
+    protected $dataValue;
+
+    /**
+     * Contains a reference to the dataset to check for availability of data
+     * keys
+     * 
+     * @var ezcGraphDataset
+     */
+    protected $dataset;
+
+    /**
+     * Abstract method to contain the check for validity of the value
+     * 
+     * @param & $value 
+     * @abstract
+     * @access protected
+     * @return void
+     */
+    abstract protected function checkValue( &$value );
+
+    public function __construct( ezcGraphDataset $dataset )
+    {
+        $this->dataset = $dataset;
+    }
+
+    /**
+     * Set the default value for this property
+     * 
+     * @param string $name Property name
+     * @param mixed $value Property value
+     * @return void
+     */
+    public function __set( $name, $value )
+    {
+        if ( $name === 'default' &&
+             $this->checkValue( $value ) )
+        {
+            $this->defaultValue = $value;
+        }
+    }
+
+    /**
+     * Get the default value for this property
+     * 
+     * @param string $name Property name
+     * @return mixed
+     */
+    public function __get( $name )
+    {
+        if ( $name === 'default' )
+        {
+            return $this->defaultValue;
+        }
+    }
+
+    /**
+     * Returns if an option exists.
+     * Allows isset() using ArrayAccess.
+     * 
+     * @param string $key The name of the option to get.
+     * @return bool Wether the option exists.
+     */
+    final public function offsetExists( $key )
+    {
+        return isset( $this->dataset[$key] );
+    }
+
+    /**
+     * Returns an option value.
+     * Get an option value by ArrayAccess.
+     * 
+     * @param string $key The name of the option to get.
+     * @return mixed The option value.
+     *
+     * @throws ezcBasePropertyNotFoundException
+     *         If a the value for the property options is not an instance of
+     */
+    final public function offsetGet( $key )
+    {
+        if ( isset( $this->dataValue[$key] ) )
+        {
+            return $this->dataValue[$key];
+        }
+        elseif ( isset( $this->dataset[$key] ) )
+        {
+            return $this->defaultValue;
+        }
+        else
+        {
+            throw new ezcGraphNoSuchDataException( $key );
+        }
+    }
+
+    /**
+     * Set an option.
+     * Sets an option using ArrayAccess.
+     * 
+     * @param string $key The option to set.
+     * @param mixed $value The value for the option.
+     * @return void
+     *
+     * @throws ezcBasePropertyNotFoundException
+     *         If a the value for the property options is not an instance of
+     * @throws ezcBaseValueException
+     *         If a the value for a property is out of range.
+     */
+    final public function offsetSet( $key, $value )
+    {
+        if ( isset( $this->dataset[$key] ) &&
+             $this->checkValue( $value ) )
+        {
+            $this->dataValue[$key] = $value;
+        }
+        else
+        {
+            throw new ezcGraphNoSuchDataException( $key );
+        }
+    }
+
+    /**
+     * Unset an option.
+     * Unsets an option using ArrayAccess.
+     * 
+     * @param string $key The options to unset.
+     * @return void
+     *
+     * @throws ezcBasePropertyNotFoundException
+     *         If a the value for the property options is not an instance of
+     * @throws ezcBaseValueException
+     *         If a the value for a property is out of range.
+     */
+    final public function offsetUnset( $key )
+    {
+        if ( isset( $this->dataset[$value] ) )
+        {
+            unset( $this->dataValue[$key] );
+        }
+        else
+        {
+            throw new ezcGraphNoSuchDataException( $key );
+        }
+    }
+}
+
+?>