net.sf.jasperreports.engine.query

Class JRSqlAbstractEqualClause

java.lang.Object

net.sf.jasperreports.engine.query.JRSqlAbstractEqualClause

All Implemented Interfaces:

JRClauseFunction

Direct Known Subclasses:

JRSqlEqualClause, JRSqlNotEqualClause

public abstract class JRSqlAbstractEqualClause
extends Object
implements JRClauseFunction

Base (NOT) EQUAL clause function for SQL queries.

The first token in the $X{...} syntax is the function ID token. Possible values for the (NOT) EQUAL clause function ID token are:

• EQUAL
• NOTEQUAL

Author:

sanda zaharia ([email protected])

Field Summary

Fields

Modifier and Type	Field and Description
static int	POSITION_DB_COLUMN
static int	POSITION_PARAMETER

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	JRSqlAbstractEqualClause()

Method Summary

Methods

Modifier and Type	Method and Description
void	apply(JRClauseTokens clauseTokens, JRQueryClauseContext queryContext) Creates a (NOT) EQUAL SQL clause.
protected void	finalizeClause(StringBuffer sbuffer, String param, JRQueryClauseContext queryContext) Finalizes the query string
protected abstract void	handleEqualOperator(StringBuffer sBuffer, String param, JRQueryClauseContext queryContext)

Methods inherited from class java.lang.Object

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

Field Detail

POSITION_DB_COLUMN

public static final int POSITION_DB_COLUMN

See Also:

Constant Field Values

POSITION_PARAMETER

public static final int POSITION_PARAMETER

See Also:

Constant Field Values

Constructor Detail

JRSqlAbstractEqualClause

protected JRSqlAbstractEqualClause()

Method Detail

apply

public void apply(JRClauseTokens clauseTokens,
         JRQueryClauseContext queryContext)

Creates a (NOT) EQUAL SQL clause.

The method expects two clause tokens (after the ID token):

• The first token is the SQL column (or column combination) to be used in the clause.
• The second token is the name of the report parameter that contains the value to compare to.

The EQUAL function constructs either a column = ? or an column IS NULL clause, depending on the parameter's value.

The NOTEQUAL function constructs either a column <> ? or an column IS NOT NULL clause, depending on the parameter's value.

Specified by:

apply in interface JRClauseFunction

Parameters:

clauseTokens - the clause tokens

queryContext - the query context

finalizeClause

protected void finalizeClause(StringBuffer sbuffer,
                  String param,
                  JRQueryClauseContext queryContext)

Finalizes the query string

Parameters:

sbuffer -

param -

queryContext -

handleEqualOperator

protected abstract void handleEqualOperator(StringBuffer sBuffer,
                       String param,
                       JRQueryClauseContext queryContext)