org.datanucleus.store.rdbms.sql.expression

Class MapExpression

java.lang.Object

org.datanucleus.store.rdbms.sql.expression.SQLExpression

org.datanucleus.store.rdbms.sql.expression.MapExpression

Direct Known Subclasses:

MapLiteral

public class MapExpression
extends SQLExpression

An expression that represents some Map field in a query candidate class, or a Map field in an object linked from the candidate class by navigation.

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression

SQLExpression.ColumnExpressionList

Field Summary

Fields inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression

lowestOperator, mapping, parameterName, st, stmt, subExprs, table

Constructor Summary

Constructors

Constructor and Description
MapExpression(SQLStatement stmt, SQLTable table, JavaTypeMapping mapping) Constructor.

Method Summary

Modifier and Type	Method and Description
BooleanExpression	eq(SQLExpression expr) Method to return the expression for comparing a map with a value.
String	getAliasForMapTable() Accessor for the "map" table where this expression represents an alias set in the FROM clause, so already joined.
SQLExpression	invoke(String methodName, List args) Invocation of a method on this expression.
BooleanExpression	ne(SQLExpression expr) Method to return the expression for comparing a map with a value.
void	setAliasForMapTable(String alias) Method to set the alias for the "map" table (join table, or key table when value in key, or value table when key in value) when specified in FROM.

Methods inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression

add, and, bitAnd, bitOr, cast, com, distinct, div, encloseInParentheses, eor, ge, getJavaTypeMapping, getLowestOperator, getNumberOfSubExpressions, getParameterName, getSQLStatement, getSQLTable, getSubExpression, gt, in, ior, is, isParameter, le, lt, mod, mul, neg, not, setJavaTypeMapping, sub, toSQLText

Methods inherited from class java.lang.Object

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

Constructor Detail

MapExpression

public MapExpression(SQLStatement stmt,
                     SQLTable table,
                     JavaTypeMapping mapping)

Constructor.

Parameters:

stmt - The SQL Statement

table - Table containing the map field

mapping - The java field mapping

Method Detail

setAliasForMapTable

public void setAliasForMapTable(String alias)

Method to set the alias for the "map" table (join table, or key table when value in key, or value table when key in value) when specified in FROM.

Parameters:

alias - The alias for the map table

getAliasForMapTable

public String getAliasForMapTable()

Accessor for the "map" table where this expression represents an alias set in the FROM clause, so already joined.

Returns:

Alias for the "map" table (if defined in FROM)

invoke

public SQLExpression invoke(String methodName,
                            List args)

Description copied from class: SQLExpression

Invocation of a method on this expression.

Overrides:

invoke in class SQLExpression

Parameters:

methodName - name of the method to invoke

args - Args to this method (if any)

Returns:

the converted value

eq

public BooleanExpression eq(SQLExpression expr)

Method to return the expression for comparing a map with a value. Only supports comparisons with null currently.

Overrides:

eq in class SQLExpression

Parameters:

expr - The value to compare with.

Returns:

The expression of equality

ne

public BooleanExpression ne(SQLExpression expr)

Method to return the expression for comparing a map with a value. Only supports comparisons with null currently.

Overrides:

ne in class SQLExpression

Parameters:

expr - The value to compare with.

Returns:

The expression of inequality