Class MappingExpressionImpl

java.lang.Object

se.liu.ida.hefquin.mappings.algebra.exprs.MappingExpressionImpl

All Implemented Interfaces:

MappingExpression

public class MappingExpressionImpl
extends Object
implements MappingExpression

This is an abstract base class for classes that implement the MappingExpression interface. This base class implements MappingExpression.getID().

Field Summary

Fields

Modifier and Type	Field	Description
protected final int	id
protected final MappingOperator	rootOp
protected final Set<String>	schema
protected final List<MappingExpression>	subExprs
protected final boolean	valid

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	MappingExpressionImpl(boolean valid, Set<String> schema, MappingOperator rootOp, MappingExpression... subExprs)	Use MappingExpressionFactory instead.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
int	getID()	Returns an identifier of this mapping expression, which should be distinct from the identifiers of all other sub-expressions within the same expression.
MappingOperator	getRootOperator()	Returns the root operator of this expression.
Set<String>	getSchema()	Returns the schema of the mapping relation that will be the result of evaluating this mapping expression.
MappingExpression	getSubExpression(int i)	Returns the i-th sub-expression of this expression, where i starts at index 0 (zero).
int	hashCode()
boolean	isValid()	Returns true if this mapping expression is valid.
int	numberOfSubExpressions()	Returns the number of sub-expressions that this expression has (considering sub-expressions that are direct children of the root operator of this expressions).

Methods inherited from class java.lang.Object

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

Methods inherited from interface se.liu.ida.hefquin.mappings.algebra.exprs.MappingExpression

isSameExpression

Field Details

id

protected final int id

valid

protected final boolean valid

schema

protected final Set<String> schema

rootOp

protected final MappingOperator rootOp

subExprs

protected final List<MappingExpression> subExprs

Constructor Details

MappingExpressionImpl

protected MappingExpressionImpl(boolean valid,
 Set<String> schema,
 MappingOperator rootOp,
 MappingExpression... subExprs)

Use MappingExpressionFactory instead.

Method Details

getID

public int getID()

Description copied from interface: MappingExpression

Returns an identifier of this mapping expression, which should be distinct from the identifiers of all other sub-expressions within the same expression.

Specified by:

getID in interface MappingExpression

isValid

public boolean isValid()

Description copied from interface: MappingExpression

Returns true if this mapping expression is valid.

Specified by:

isValid in interface MappingExpression

getSchema

public Set<String> getSchema()

Description copied from interface: MappingExpression

Returns the schema of the mapping relation that will be the result of evaluating this mapping expression.

Specified by:

getSchema in interface MappingExpression

getRootOperator

public MappingOperator getRootOperator()

Description copied from interface: MappingExpression

Returns the root operator of this expression.

Specified by:

getRootOperator in interface MappingExpression

numberOfSubExpressions

public int numberOfSubExpressions()

Description copied from interface: MappingExpression

Returns the number of sub-expressions that this expression has (considering sub-expressions that are direct children of the root operator of this expressions).

Specified by:

numberOfSubExpressions in interface MappingExpression

getSubExpression

public MappingExpression getSubExpression(int i)

Description copied from interface: MappingExpression

Returns the i-th sub-expression of this expression, where i starts at index 0 (zero). If the expression has fewer sub-expressions (or no sub-expressions at all), then an IndexOutOfBoundsException will be thrown.

Specified by:

getSubExpression in interface MappingExpression

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object