uk.ac.ed.epcc.webapp.jdbc.expr

Class LocateSQLExpression

java.lang.Object

uk.ac.ed.epcc.webapp.jdbc.expr.LocateSQLExpression

All Implemented Interfaces:

GroupingSQLValue<java.lang.Integer>, SQLExpression<java.lang.Integer>, SQLValue<java.lang.Integer>, Targetted<java.lang.Integer>

public class LocateSQLExpression
extends java.lang.Object
implements SQLExpression<java.lang.Integer>

Create locate expression in SQL.

Constructor Summary

Constructors

Constructor and Description
LocateSQLExpression(SQLExpression<java.lang.String> substr, SQLExpression<java.lang.String> str, SQLExpression<java.lang.Integer> pos)

Method Summary

Modifier and Type	Method and Description
int	add(java.lang.StringBuilder sb, boolean qualify) Add the expression to a StringBuilder
boolean	equals(java.lang.Object obj)
java.util.List<PatternArgument>	getParameters(java.util.List<PatternArgument> list) Add parameters for this value to a list.
SQLExpression	getPosition()
SQLFilter	getRequiredFilter() Get an SQLFilter required to be added to the filter set.
SQLExpression	getString()
SQLExpression	getSubstring()
java.lang.Class<java.lang.Integer>	getTarget() Get the type of the returned object as far as it is known.
int	hashCode()
java.lang.Integer	makeObject(java.sql.ResultSet rs, int loc) Extract a result of the expression from a ResultSet into an object of the specified type.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface uk.ac.ed.epcc.webapp.jdbc.expr.SQLExpression

groupingIsomorphic

Methods inherited from interface uk.ac.ed.epcc.webapp.jdbc.expr.GroupingSQLValue

addGroup, checkContentsCanGroup, getGroupParameters

Constructor Detail

LocateSQLExpression

public LocateSQLExpression(SQLExpression<java.lang.String> substr,
                           SQLExpression<java.lang.String> str,
                           SQLExpression<java.lang.Integer> pos)

Method Detail

add

public int add(java.lang.StringBuilder sb,
               boolean qualify)

Description copied from interface: SQLValue

Add the expression to a StringBuilder

Specified by:

add in interface SQLValue<java.lang.Integer>

Parameters:

sb - StringBuilder to modify

qualify - boolean should fields be qualified with the table name

Returns:

number of fields added

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getTarget

public java.lang.Class<java.lang.Integer> getTarget()

Description copied from interface: Targetted

Get the type of the returned object as far as it is known. Normally this should be the erasure type corresponding to T.

Specified by:

getTarget in interface Targetted<java.lang.Integer>

Returns:

Class object for return type

makeObject

public java.lang.Integer makeObject(java.sql.ResultSet rs,
                                    int loc)
                             throws DataException,
                                    java.sql.SQLException

Description copied from interface: SQLValue

Extract a result of the expression from a ResultSet into an object of the specified type. Note that this method is also used to extract the result of functions over the result type.

Specified by:

makeObject in interface SQLValue<java.lang.Integer>

Parameters:

rs - ResultSet

Returns:

produced object

Throws:

DataException

java.sql.SQLException

getParameters

public java.util.List<PatternArgument> getParameters(java.util.List<PatternArgument> list)

Description copied from interface: SQLValue

Add parameters for this value to a list.

Specified by:

getParameters in interface SQLValue<java.lang.Integer>

Parameters:

list - to modify

Returns:

modified list of parameter objects

getRequiredFilter

public SQLFilter getRequiredFilter()

Description copied from interface: SQLValue

Get an SQLFilter required to be added to the filter set. This is usually to implement a join.

Specified by:

getRequiredFilter in interface SQLValue<java.lang.Integer>

Returns:

null or SQLFilter

getSubstring

public SQLExpression getSubstring()

getString

public SQLExpression getString()

getPosition

public SQLExpression getPosition()

hashCode

public int hashCode()

Specified by:

hashCode in interface SQLExpression<java.lang.Integer>

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Specified by:

equals in interface SQLExpression<java.lang.Integer>

Overrides:

equals in class java.lang.Object