org.apache.calcite.adapter.java

Class ReflectiveSchema.Factory

java.lang.Object

org.apache.calcite.adapter.java.ReflectiveSchema.Factory

All Implemented Interfaces:

SchemaFactory

Enclosing class:

ReflectiveSchema

public static class ReflectiveSchema.Factory
extends Object
implements SchemaFactory

Factory that creates a schema by instantiating an object and looking at its public fields.

The following example instantiates a FoodMart object as a schema that contains tables called EMPS and DEPTS based on the object's fields.

 schemas: [
     {
       name: "foodmart",
       type: "custom",
       factory: "org.apache.calcite.adapter.java.ReflectiveSchema$Factory",
       operand: {
         class: "com.acme.FoodMart",
         staticMethod: "instance"
       }
     }
   ]

 class FoodMart {
   public static final FoodMart instance() {
     return new FoodMart();
   }

   Employee[] EMPS;
   Department[] DEPTS;
 }
 

Constructor Summary

Constructors

Constructor and Description
ReflectiveSchema.Factory()

Method Summary

Methods

Modifier and Type	Method and Description
Schema	create(SchemaPlus parentSchema, String name, Map<String,Object> operand) Creates a Schema.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReflectiveSchema.Factory

public ReflectiveSchema.Factory()

Method Detail

create

public Schema create(SchemaPlus parentSchema,
            String name,
            Map<String,Object> operand)

Description copied from interface: SchemaFactory

Creates a Schema.

Specified by:

create in interface SchemaFactory

Parameters:

parentSchema - Parent schema

name - Name of this schema

operand - The "operand" JSON property

Returns:

Created schema