Managed_DataObject initial sketches (pulling Drupal-style schema def into the data that DB_DataObject and Memcached_DataObject use; not yet functional. Converted OStatus_profile for demo.)

1 files changed, 156 insertions, 0 deletions

diff --git a/classes/Managed_DataObject.php b/classes/Managed_DataObject.php
new file mode 100644
index 000000000..3bc99c2eb
--- /dev/null
+++ b/classes/Managed_DataObject.php
@@ -0,0 +1,156 @@
+<?php
+/*
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2010, StatusNet, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * Wrapper for Memcached_DataObject which knows its own schema definition.
+ * Builds its own damn settings from a schema definition.
+ *
+ * @author brion
+ */
+class Managed_DataObject extends Memcached_DataObject
+{
+    /**
+     * The One True Thingy that must be defined and declared.
+     */
+    public static abstract function schemaDef();
+
+    /**
+     * get/set an associative array of table columns
+     *
+     * @access public
+     * @return array (associative)
+     */
+    function table()
+    {
+        $table = self::schemaDef();
+        return array_map(array($this, 'columnBitmap'), $table['fields']);
+    }
+
+    /**
+     * get/set an  array of table primary keys
+     *
+     * Key info is pulled from the table definition array.
+     * 
+     * @access private
+     * @return array
+     */
+    function keys()
+    {
+        return array_keys($this->keyTypes());
+    }
+
+    /**
+     * Get a sequence key
+     *
+     * Returns the first serial column defined in the table, if any.
+     *
+     * @access private
+     * @return array (column,use_native,sequence_name)
+     */
+
+    function sequenceKey()
+    {
+        $table = self::schemaDef();
+        foreach ($table['fields'] as $name => $column) {
+            if ($column['type'] == 'serial') {
+                // We have a serial/autoincrement column.
+                // Declare it to be a native sequence!
+                return array($name, true, false);
+            }
+        }
+
+        // No sequence key on this table.
+        return array(false, false, false);
+    }
+
+    /**
+     * Return key definitions for DB_DataObject and Memcache_DataObject.
+     *
+     * DB_DataObject needs to know about keys that the table has; this function
+     * defines them.
+     *
+     * @return array key definitions
+     */
+
+    function keyTypes()
+    {
+        $keys = array();
+        $table = self::schemaDef();
+
+        if (!empty($table['unique keys'])) {
+            foreach ($table['unique keys'] as $idx => $fields) {
+                foreach ($fields as $name) {
+                    $keys[$name] = 'U';
+                }
+            }
+        }
+
+        if (!empty($table['primary key'])) {
+            foreach ($table['primary key'] as $name) {
+                $keys[$name] = 'K';
+            }
+        }
+        return $keys;
+    }
+
+    /**
+     * Build the appropriate DB_DataObject bitfield map for this field.
+     *
+     * @param array $column
+     * @return int
+     */
+    function columnBitmap($column)
+    {
+        $type = 0;
+
+        switch ($column['type']) {
+        case 'int':
+        case 'serial':
+        case 'numeric':
+            // Doesn't need quoting.
+            $type |= DB_DATAOBJECT_INT;
+            break;
+        default:
+            // Value needs quoting in SQL literal statements.
+            $type |= DB_DATAOBJECT_STR;
+        }
+
+        switch ($column['type']) {
+        case 'blob':
+            $type |= DB_DATAOBJECT_BLOB;
+            break;
+        case 'text':
+            $type |= DB_DATAOBJECT_TXT;
+            break;
+        case 'datetime':
+            $type |= DB_DATAOBJECT_DATE;
+            $type |= DB_DATAOBJECT_TIME;
+            break;
+        case 'timestamp':
+            $type |= DB_DATAOBJECT_MYSQLTIMESTAMP;
+            break;
+        }
+
+        if (!empty($column['not null'])) {
+            $type |= DB_DATAOBJECT_NOTNULL;
+        }
+
+        return $type;
+    }
+}
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