Package edu.caltech.nanodb.relations

Class ColumnRefs

java.lang.Object

edu.caltech.nanodb.relations.ColumnRefs

Direct Known Subclasses:

IndexColumnRefs, KeyColumnRefs

public class ColumnRefs
extends java.lang.Object

This class represents a set of columns in a schema by specifying the indexes of the columns in the set. This is used to represent primary keys, candidate keys, foreign keys, and columns in indexes. Because it can represent constraints, an optional constraint-name and constraint-type can be specified on the class.

Field Summary

Fields

Modifier and Type	Field	Description
private int[]	colIndexes	This array holds the indexes of the columns in the set.
private java.lang.String	constraintName	This is the optional name of the constraint specified in the DDL.
private TableConstraintType	constraintType	This optional field can indicate if there is a particular constraint on the indicated set of columns.

Constructor Summary

Constructors

Modifier	Constructor	Description
	ColumnRefs(int[] colIndexes)
protected	ColumnRefs(int[] colIndexes, java.lang.String constraintName, TableConstraintType constraintType)

Method Summary

Modifier and Type	Method	Description
boolean	equalsColumns(int[] indexes)	Returns true if the specified array of column-indexes has the same columns as this object, in the exact same order.
boolean	equalsColumns(ColumnRefs ci)	Returns true if the specified ColumnIndexes object has the same columns as this object, in the exact same order.
int	getCol(int i)
int[]	getCols()
java.lang.String	getConstraintName()
TableConstraintType	getConstraintType()
boolean	hasSameColumns(int[] indexes)	Returns true if the specified array of column-indexes has the same columns as this object, independent of order.
boolean	hasSameColumns(ColumnRefs ci)	Returns true if the specified ColumnIndexes object has the same columns as this object, independent of order.
void	setConstraintName(java.lang.String constraintName)
void	setConstraintType(TableConstraintType constraintType)
int	size()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

colIndexes

private int[] colIndexes

This array holds the indexes of the columns in the set.

constraintName

private java.lang.String constraintName

This is the optional name of the constraint specified in the DDL.

constraintType

private TableConstraintType constraintType

This optional field can indicate if there is a particular constraint on the indicated set of columns.

Constructor Detail

ColumnRefs

protected ColumnRefs(int[] colIndexes,
                     java.lang.String constraintName,
                     TableConstraintType constraintType)

ColumnRefs

public ColumnRefs(int[] colIndexes)

Method Detail

size

public int size()

getCol

public int getCol(int i)

getCols

public int[] getCols()

equalsColumns

public boolean equalsColumns(ColumnRefs ci)

Returns true if the specified ColumnIndexes object has the same columns as this object, in the exact same order.

Parameters:

ci - the ColumnIndexes object to compare to this object

Returns:

true if the two objects have the same column indexes, in the exact same order

equalsColumns

public boolean equalsColumns(int[] indexes)

Returns true if the specified array of column-indexes has the same columns as this object, in the exact same order.

Parameters:

indexes - the array of indexes to compare to this object

Returns:

true if the two objects have the same column indexes, in the exact same order

hasSameColumns

public boolean hasSameColumns(ColumnRefs ci)

Returns true if the specified ColumnIndexes object has the same columns as this object, independent of order.

Parameters:

ci - the ColumnIndexes object to compare to this object

Returns:

true if the two objects have the same column indexes, independent of order

hasSameColumns

public boolean hasSameColumns(int[] indexes)

Returns true if the specified array of column-indexes has the same columns as this object, independent of order.

Parameters:

indexes - the array of indexes to compare to this object

Returns:

true if the two objects have the same column indexes, independent of order

getConstraintName

public java.lang.String getConstraintName()

setConstraintName

public void setConstraintName(java.lang.String constraintName)

getConstraintType

public TableConstraintType getConstraintType()

setConstraintType

public void setConstraintType(TableConstraintType constraintType)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object