ca.uqac.dim.turtledb

Class Tuple

java.lang.Object

ca.uqac.dim.turtledb.Tuple

All Implemented Interfaces:

java.lang.Comparable<Tuple>

public class Tuple
extends java.lang.Object
implements java.lang.Comparable<Tuple>

A tuple is an ordered collection of attribute-value pairs.

Author:

sylvain

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.Vector<Attribute>	m_attributes
protected java.util.Vector<Value>	m_values

Constructor Summary

Constructors

Constructor and Description
Tuple(Schema sch, java.lang.String values)
Tuple(Schema sch, Value[] val)
Tuple(Tuple t) Constructor by copy

Method Summary

Modifier and Type	Method and Description
void	clear()
int	compareTo(Tuple t) Compares two tuples.
boolean	equals(java.lang.Object o)
boolean	equals(Tuple t)
Value	get(Literal a)
int	getDegree() Returns the tuple's degree (i.e.
java.util.Set<Attribute>	keySet()
static Tuple	makeTuple(java.util.Vector<Tuple> v) Fusions multiple tuples to create a single tuple
void	put(Attribute a, Value v)
void	putAll(Tuple t)
void	setSchema(Schema sch) Overwrites the schema of a tuple.
void	setTable(java.lang.String name) Affixes a given table name to all attributes of the tuple.
int	size()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

m_attributes

protected java.util.Vector<Attribute> m_attributes

m_values

protected java.util.Vector<Value> m_values

Constructor Detail

Tuple

public Tuple(Tuple t)

Constructor by copy

Parameters:

t - A tuple

Tuple

public Tuple(Schema sch,
             Value[] val)

Tuple

public Tuple(Schema sch,
             java.lang.String values)

Method Detail

setSchema

public void setSchema(Schema sch)

Overwrites the schema of a tuple. This works only if the new schema has the same cardinality as the old one.

Parameters:

sch - The schema to replace the tuple's current one

get

public Value get(Literal a)

clear

public void clear()

put

public void put(Attribute a,
                Value v)

putAll

public void putAll(Tuple t)

keySet

public java.util.Set<Attribute> keySet()

setTable

public void setTable(java.lang.String name)

Affixes a given table name to all attributes of the tuple.

Parameters:

name - The table's name

compareTo

public int compareTo(Tuple t)

Compares two tuples. We use lexicographical ordering of the tuple's values, starting from the left.

Specified by:

compareTo in interface java.lang.Comparable<Tuple>

size

public int size()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getDegree

public int getDegree()

Returns the tuple's degree (i.e. number of columns)

Returns:

The degree

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

equals

public boolean equals(Tuple t)

makeTuple

public static Tuple makeTuple(java.util.Vector<Tuple> v)

Fusions multiple tuples to create a single tuple

Parameters:

v -

Returns: