net.sf.jasperreports.engine.query

Class SQLLessOrGreaterBaseClause

java.lang.Object

net.sf.jasperreports.engine.query.SQLLessOrGreaterBaseClause

All Implemented Interfaces:

JRClauseFunction

Direct Known Subclasses:

DateRangeSQLLessOrGreaterClause, JRSqlLessOrGreaterClause

public abstract class SQLLessOrGreaterBaseClause
extends Object
implements JRClauseFunction

Version:

$Id: SQLLessOrGreaterBaseClause.java 5707 2012-10-03 15:27:17Z lucianc $

Author:

sanda zaharia (shertage@users.sourceforge.net)

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	CLAUSE_TRUISM
protected static String	OPERATOR_GREATER
protected static String	OPERATOR_GREATER_OR_EQUAL
protected static String	OPERATOR_LESS
protected static String	OPERATOR_LESS_OR_EQUAL
protected static int	POSITION_CLAUSE_ID
protected static int	POSITION_DB_COLUMN
protected static int	POSITION_PARAMETER

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SQLLessOrGreaterBaseClause()

Method Summary

Methods

Modifier and Type	Method and Description
void	apply(JRClauseTokens clauseTokens, JRQueryClauseContext queryContext) Creates either a LESS or a GREATER SQL clause, depending on the clause ID.
protected abstract ClauseFunctionParameterHandler	createParameterHandler(JRQueryClauseContext queryContext, String clauseId, String parameterName)
protected void	handleLessOrGreaterOperator(StringBuffer sBuffer, String clauseId) Appends the appropriate inequality sign to the query string, depending on the clause ID value

Methods inherited from class java.lang.Object

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

Field Detail

POSITION_CLAUSE_ID

protected static final int POSITION_CLAUSE_ID

See Also:

Constant Field Values

POSITION_DB_COLUMN

protected static final int POSITION_DB_COLUMN

See Also:

Constant Field Values

POSITION_PARAMETER

protected static final int POSITION_PARAMETER

See Also:

Constant Field Values

OPERATOR_LESS

protected static final String OPERATOR_LESS

See Also:

Constant Field Values

OPERATOR_LESS_OR_EQUAL

protected static final String OPERATOR_LESS_OR_EQUAL

See Also:

Constant Field Values

OPERATOR_GREATER

protected static final String OPERATOR_GREATER

See Also:

Constant Field Values

OPERATOR_GREATER_OR_EQUAL

protected static final String OPERATOR_GREATER_OR_EQUAL

See Also:

Constant Field Values

CLAUSE_TRUISM

protected static final String CLAUSE_TRUISM

See Also:

Constant Field Values

Constructor Detail

SQLLessOrGreaterBaseClause

protected SQLLessOrGreaterBaseClause()

Method Detail

apply

public void apply(JRClauseTokens clauseTokens,
         JRQueryClauseContext queryContext)

Creates either a LESS or a GREATER SQL clause, depending on the clause ID.

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 method constructs one of the following clauses:

• column < ? if the clause ID is LESS
• column <= ? if the clause ID is LESS]
• column >= ? if the clause ID is GREATER
• column > ? if the clause ID is [GREATER

If the value to compare to is null, the method generates a SQL clause that will always evaluate to true (e.g. 0 = 0).

Specified by:

apply in interface JRClauseFunction

Parameters:

clauseTokens - the clause tokens

queryContext - the query context

createParameterHandler

protected abstract ClauseFunctionParameterHandler createParameterHandler(JRQueryClauseContext queryContext,
                                                    String clauseId,
                                                    String parameterName)

handleLessOrGreaterOperator

protected void handleLessOrGreaterOperator(StringBuffer sBuffer,
                               String clauseId)

Appends the appropriate inequality sign to the query string, depending on the clause ID value

Parameters:

sBuffer - the StringBuffer that contains the generated query

clauseId - the clause ID