Package org.apache.calcite.adapter.java

Class ReflectiveSchema

java.lang.Object

org.apache.calcite.schema.impl.AbstractSchema

org.apache.calcite.adapter.java.ReflectiveSchema

All Implemented Interfaces:

Schema

Direct Known Subclasses:

ReflectiveSchemaWithoutRowCount

public class ReflectiveSchema
extends AbstractSchema

Implementation of Schema that exposes the public fields and methods in a Java object.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ReflectiveSchema.Factory	Factory that creates a schema by instantiating an object and looking at its public fields.

Nested classes/interfaces inherited from interface org.apache.calcite.schema.Schema

Schema.TableType

Constructor Summary

Constructors

Constructor	Description
ReflectiveSchema(Object target)	Creates a ReflectiveSchema.

Method Summary

Modifier and Type	Method	Description
protected com.google.common.collect.Multimap<String,Function>	getFunctionMultimap()	Returns a multi-map of functions in this schema by name.
protected @Nullable Double	getRowCount(Object o)
protected Map<String,Table>	getTableMap()	Returns a map of tables in this schema by name.
Object	getTarget()	Returns the wrapped object.
String	toString()

Methods inherited from class org.apache.calcite.schema.impl.AbstractSchema

getExpression, getFunctionNames, getFunctions, getSubSchema, getSubSchemaMap, getSubSchemaNames, getTable, getTableNames, getType, getTypeMap, getTypeNames, isMutable, snapshot

Methods inherited from class java.lang.Object

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

Constructor Details

ReflectiveSchema

public ReflectiveSchema(Object target)

Creates a ReflectiveSchema.

Parameters:

target - Object whose fields will be sub-objects of the schema

Method Details

toString

public String toString()

Overrides:

toString in class Object

getTarget

public Object getTarget()

Returns the wrapped object.

May not appear to be used, but is used in generated code via BuiltInMethod.REFLECTIVE_SCHEMA_GET_TARGET.

getTableMap

protected Map<String,Table> getTableMap()

Description copied from class: AbstractSchema

Returns a map of tables in this schema by name.

The implementations of AbstractSchema.getTableNames() and AbstractSchema.getTable(String) depend on this map. The default implementation of this method returns the empty map. Override this method to change their behavior.

Overrides:

getTableMap in class AbstractSchema

Returns:

Map of tables in this schema by name

getFunctionMultimap

protected com.google.common.collect.Multimap<String,Function> getFunctionMultimap()

Description copied from class: AbstractSchema

Returns a multi-map of functions in this schema by name. It is a multi-map because functions are overloaded; there may be more than one function in a schema with a given name (as long as they have different parameter lists).

The implementations of AbstractSchema.getFunctionNames() and Schema.getFunctions(String) depend on this map. The default implementation of this method returns the empty multi-map. Override this method to change their behavior.

Overrides:

getFunctionMultimap in class AbstractSchema

Returns:

Multi-map of functions in this schema by name

getRowCount

protected @Nullable Double getRowCount(Object o)