org.vanilladb.core.sql

Class Schema

java.lang.Object

org.vanilladb.core.sql.Schema

All Implemented Interfaces:

Serializable

public class Schema
extends Object
implements Serializable

The schema of a table, which contains the name and type of each field of the table.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Schema() Creates an empty schema.

Method Summary

Modifier and Type	Method and Description
void	add(String fldName, Schema sch) Adds a field in another schema having the specified name to this schema.
void	addAll(Schema sch) Adds all of the fields in the specified schema to this schema.
void	addField(String fldName, Type type) Adds a field to this schema having a specified name and type.
boolean	equals(Object obj)
SortedSet<String>	fields() Returns a sorted set containing the field names in this schema, sorted by their natural ordering.
boolean	hasField(String fldName) Returns true if the specified field is in this schema.
int	hashCode()
String	toString()
Type	type(String fldName) Returns the type of the specified field.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Schema

public Schema()

Creates an empty schema.

Method Detail

addField

public void addField(String fldName,
                     Type type)

Adds a field to this schema having a specified name and type.

Parameters:

fldName - the name of the field

type - the type of the field, according to the constants in Type

add

public void add(String fldName,
                Schema sch)

Adds a field in another schema having the specified name to this schema.

Parameters:

fldName - the name of the field

sch - the other schema

addAll

public void addAll(Schema sch)

Adds all of the fields in the specified schema to this schema.

Parameters:

sch - the other schema

fields

public SortedSet<String> fields()

Returns a sorted set containing the field names in this schema, sorted by their natural ordering.

Returns:

the sorted set of the schema's field names

hasField

public boolean hasField(String fldName)

Returns true if the specified field is in this schema.

Parameters:

fldName - the name of the field

Returns:

true if the field is in this schema

type

public Type type(String fldName)

Returns the type of the specified field.

Parameters:

fldName - the name of the field

Returns:

the type of the field

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object