org.datanucleus.store.mapped.expression
Class JoinExpression

java.lang.Object
  org.datanucleus.store.mapped.expression.ScalarExpression
      org.datanucleus.store.mapped.expression.JoinExpression

public class JoinExpression
extends ScalarExpression

An expression representing a JOIN in JPQL terms.

Version:

$Revision: 1.1 $

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.store.mapped.expression.ScalarExpression

ScalarExpression.DatastoreFieldExpression, ScalarExpression.DyadicOperator, ScalarExpression.ExpressionList, ScalarExpression.IllegalArgumentTypeException, ScalarExpression.IllegalOperationException, ScalarExpression.MethodInvocationException, ScalarExpression.MonadicOperator, ScalarExpression.Operator

Field Summary

Fields inherited from class org.datanucleus.store.mapped.expression.ScalarExpression

aliasIdentifier, checkForTypeAssignability, expressionList, FILTER, LOCALISER, lowestOperator, mapping, OP_ADD, OP_AND, OP_BETWEEN, OP_COM, OP_CONCAT, OP_DIV, OP_EQ, OP_GT, OP_GTEQ, OP_IN, OP_IS, OP_ISNOT, OP_LIKE, OP_LT, OP_LTEQ, OP_MOD, OP_MUL, OP_NEG, OP_NOT, OP_NOTEQ, OP_NOTIN, OP_NOTLIKE, OP_OR, OP_SUB, parameterName, PROJECTION, qs, st, te

Constructor Summary

JoinExpression(QueryExpression qs, java.lang.String fieldName, boolean leftJoin, boolean fetch)
Constructor.

Method Summary

java.lang.String	getFieldName() Accessor for the field name being joined.
boolean	isFetch()
boolean	isLeftJoin()

Methods inherited from class org.datanucleus.store.mapped.expression.ScalarExpression

accessField, add, and, as, assertValidTypeForParameterComparison, callMethod, cast, checkForTypeAssignability, com, div, encloseWithInParentheses, eor, eq, equals, getAlias, getConsistentTypeForParameterComparison, getExpressionList, getLogicSetExpression, getMapping, getNonAliasExpression, getQueryExpression, gt, gteq, in, instanceOf, ior, lt, lteq, mod, mul, neg, not, noteq, setParameterName, sub, toStatementText, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinExpression

public JoinExpression(QueryExpression qs,
                      java.lang.String fieldName,
                      boolean leftJoin,
                      boolean fetch)

Constructor.

Parameters:

qs - The Query Statement

fieldName - "Name" for field being joined to

leftJoin - whether this is a left join, otherwise it is an inner join

fetch - whether to fetch the right hand expression by the query

Method Detail

getFieldName

public java.lang.String getFieldName()

Accessor for the field name being joined.

Returns:

The field name (including any alias)

isLeftJoin

public boolean isLeftJoin()

Returns:

the leftJoin

isFetch

public boolean isFetch()

Returns:

the fetch