working java,python, js then added rust, then rewired java to j

2026-04-18 10:32:12 -05:00
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+/* 
+Copyright (c) 2011-2022 Reliancy LLC
+
+Licensed under the GNU LESSER GENERAL PUBLIC LICENSE Version 3.
+You may obtain a copy of the License at https://www.gnu.org/licenses/lgpl-3.0.en.html.
+You may not use this file except in compliance with the License. 
+*/
+package com.reliancy.dbo.meta;
+
+import java.sql.Timestamp;
+import com.reliancy.dbo.DBO;
+import com.reliancy.dbo.Entity;
+import com.reliancy.dbo.Field;
+
+/**
+ * Metadata definition for a database field/column.
+ * 
+ * <p>FieldDefinition extends DBO to store metadata about fields within entities,
+ * including database column information, constraints, and versioning.
+ * 
+ * <h2>Usage:</h2>
+ * <pre>{@code
+ * MetaTerminal meta = (MetaTerminal) terminal;
+ * 
+ * // Load field definitions for an entity
+ * List<FieldDefinition> fields = meta.load_fields("PersonDBO");
+ * 
+ * // Create new field definition
+ * FieldDefinition fieldDef = new FieldDefinition();
+ * fieldDef.set(FieldDefinition.ENTITY_NAME, "PersonDBO");
+ * fieldDef.set(FieldDefinition.FIELD_NAME, "name");
+ * fieldDef.set(FieldDefinition.COLUMN_NAME, "name");
+ * fieldDef.set(FieldDefinition.COLUMN_TYPE, "VARCHAR");
+ * fieldDef.set(FieldDefinition.TYPE_PARAMS, "255");
+ * fieldDef.set(FieldDefinition.POSITION, 0);
+ * meta.save(fieldDef);
+ * }</pre>
+ * 
+ * @see com.reliancy.dbo.meta.MetaTerminal
+ * @see EntityDefinition
+ * @see ChangeEvent
+ */
+@Entity.Info(name="bstore.field_definition")
+public class FieldDefinition extends DBO {
+    // Primary key (composite: entity_name + field_name)
+    public static final Field ID = Field.Str("id").setPk(true); // Format: "EntityName.fieldName"
+    public static final Field ENTITY_NAME = Field.Str("entity_name"); // FK to EntityDefinition
+    public static final Field FIELD_NAME = Field.Str("field_name");   // Java field name
+    
+    // Database mapping
+    public static final Field COLUMN_NAME = Field.Str("column_name"); // Database column name (id)
+    public static final Field COLUMN_TYPE = Field.Str("column_type"); // SQL type (VARCHAR, INTEGER, etc.)
+    public static final Field TYPE_PARAMS = Field.Str("type_params"); // e.g., "255" for VARCHAR(255)
+    
+    // Position & ordering
+    public static final Field POSITION = Field.Int("position");       // Field position in entity
+    
+    // Constraints
+    public static final Field IS_PK = Field.Bool("is_pk");
+    public static final Field IS_AUTO_INCREMENT = Field.Bool("is_auto_increment");
+    public static final Field IS_NULLABLE = Field.Bool("is_nullable");
+    public static final Field IS_UNIQUE = Field.Bool("is_unique");
+    public static final Field IS_INDEXED = Field.Bool("is_indexed");
+    public static final Field DEFAULT_VALUE_JSON = Field.Str("default_value_json"); // JSON representation
+    
+    // Versioning & tracking
+    public static final Field ORIGINATOR_ID = Field.Str("originator_id").setTypeParams("128");
+    public static final Field MIGRATION_ID = Field.Str("migration_id").setTypeParams("128");
+    
+    // Lifecycle
+    public static final Field CREATED_ON = Field.DateTime("created_on");
+    public static final Field UPDATED_ON = Field.DateTime("updated_on");
+    public static final Field IS_DEPRECATED = Field.Bool("is_deprecated");
+    public static final Field DEPRECATED_ON = Field.DateTime("deprecated_on");
+    public static final Field IS_ACTIVE = Field.Bool("is_active");
+   
+    // Additional metadata
+    public static final Field DESCRIPTION = Field.Str("description");
+    
+    public FieldDefinition() {
+        super();
+        setStatus(Status.NEW);
+        set(IS_ACTIVE, true);
+        set(IS_DEPRECATED, false);
+        set(IS_PK, false);
+        set(IS_AUTO_INCREMENT, false);
+        set(IS_NULLABLE, true);
+        set(IS_UNIQUE, false);
+        if (get(CREATED_ON) == null) {
+            set(CREATED_ON, new Timestamp(System.currentTimeMillis()));
+        }
+    }
+    
+    /**
+     * Generate ID from entity name and field name.
+     */
+    public static String generateId(String entityName, String fieldName) {
+        return entityName + "." + fieldName;
+    }
+}
+