ajax.type
Class FieldType

java.lang.Object
  |
  +--ajax.type.FieldType

public class FieldType

extends java.lang.Object

class FieldType - the type of a field in a tuple

Field Summary

protected Type	_elementType field type. this is the type of the corresponding field.
protected java.util.HashMap	backTables a HashMap containing the names of the tables for which this attribute is actually a backtracking explaining attribute and also the correspoding attribute.
protected java.lang.String	name field name

Constructor Summary

FieldType()
Empty Constructor required.

FieldType(java.lang.String name, Type _type)
Constructor

FieldType(java.lang.String name, Type _type, java.util.HashMap originTableAttribute)
Constructor

Method Summary

boolean	equals(FieldType other) Report if this field has the same name and type as the other field
boolean	equals(java.lang.Object other) Report if this field has the same name and type as the other field
Type	getElementType() Get type of field.
java.lang.String	getExplainingAttribute(java.lang.String tableName) Returns the explaining attribute in the explaining table given as parameter, corresponding to this attribute
java.util.Iterator	getExplainingTables() Returns an Iterator through the list of the explaining tables
java.lang.String	getName() Get field name
boolean	isExplainingAttribute() Returns true if this fieldType corresponds to an attribute which is actually an explaining attribute for other tables
boolean	sameName(FieldType other) sameName checks if this field has the same name as the other field
void	setExplainingTable(java.util.HashMap originTableAttribute) Adds a table name and the corresponding attribute to the HashMap containing the explaining tables for this attribute
java.lang.String	toString() Convert field type to human-readable string.

Methods inherited from class java.lang.Object

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

Field Detail

name

protected java.lang.String name

field name

_elementType

protected Type _elementType

field type. this is the type of the corresponding field.

backTables

protected java.util.HashMap backTables

a HashMap containing the names of the tables for which this attribute is actually a backtracking explaining attribute and also the correspoding attribute. This is required for the implementation of the explainer module.

Constructor Detail

FieldType

public FieldType()

Empty Constructor required.

FieldType

public FieldType(java.lang.String name,
                 Type _type)

Constructor

Parameters:

name - field name

type - field type

FieldType

public FieldType(java.lang.String name,
                 Type _type,
                 java.util.HashMap originTableAttribute)

Constructor

Parameters:

name - field name

type - field type

originTable - the origin table name for explaining

Method Detail

getName

public java.lang.String getName()

Get field name

Returns:

field name

getElementType

public Type getElementType()

Get type of field. Note we do not call getBaseType.

Returns:

type of field

toString

public java.lang.String toString()

Convert field type to human-readable string.

Overrides:

toString in class java.lang.Object

sameName

public boolean sameName(FieldType other)

sameName checks if this field has the same name as the other field

Parameters:

other - the other field

Returns:

true if this field have the same name as the other field

equals

public boolean equals(FieldType other)

Report if this field has the same name and type as the other field

Parameters:

other - the other field

Returns:

true if two fields are the equal, false otherwise

equals

public boolean equals(java.lang.Object other)

Report if this field has the same name and type as the other field

Overrides:

equals in class java.lang.Object

Parameters:

other - the other field

Returns:

true if two fields are the equal, false otherwise

setExplainingTable

public void setExplainingTable(java.util.HashMap originTableAttribute)

Adds a table name and the corresponding attribute to the HashMap containing the explaining tables for this attribute

Parameters:

tableName - a String representing the name of the explaininig table

attributeName - a String representing the corresponding attribute in the explaining table

getExplainingTables

public java.util.Iterator getExplainingTables()

Returns an Iterator through the list of the explaining tables

Returns:

the table names String list Iterator

getExplainingAttribute

public java.lang.String getExplainingAttribute(java.lang.String tableName)

Returns the explaining attribute in the explaining table given as parameter, corresponding to this attribute

Returns:

the table names String list Iterator

isExplainingAttribute

public boolean isExplainingAttribute()

Returns true if this fieldType corresponds to an attribute which is actually an explaining attribute for other tables