com.force.sdk.jpa.query
Class ExpressionBuilderHelper

java.lang.Object
  com.force.sdk.jpa.query.ExpressionBuilderHelper

public class ExpressionBuilderHelper
extends Object

Helper class for building the WHERE clause in SOQL queries.

Author:

Fiaz Hossain

Method Summary

void	appendRelationship(org.datanucleus.metadata.AbstractClassMetaData colCmd, int fieldNum, ColumnImpl col, String prefix, boolean isQuery) Appends a relationship via a join to this query builder.
StringBuilder	getBuilder()
org.datanucleus.query.expression.Expression	getFilterExpression(String alias) First looks in filter mappings cache for the filter expression associated with the given alias, else returns the expression from the compilation.
boolean	isJoinQuery() Checks whether the query is joined.
boolean	skipRelationship(org.datanucleus.metadata.AbstractClassMetaData cmd, int fieldNum) Determines whether to skip querying for relationship fields by comparing the current depth of the query to the maximum.

Methods inherited from class java.lang.Object

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

Method Detail

appendRelationship

public void appendRelationship(org.datanucleus.metadata.AbstractClassMetaData colCmd,
                               int fieldNum,
                               ColumnImpl col,
                               String prefix,
                               boolean isQuery)

Appends a relationship via a join to this query builder.

Parameters:

colCmd - the class metadata of the relationship column

fieldNum - the field number of the relationship column

col - the column object for the relationship field

prefix - the prefix to use for the join

isQuery - true if we're appending the relationship field but not all of the fields of the related object

getBuilder

public StringBuilder getBuilder()

isJoinQuery

public boolean isJoinQuery()

Checks whether the query is joined.

Returns:

true if this query is being joined

getFilterExpression

public org.datanucleus.query.expression.Expression getFilterExpression(String alias)

First looks in filter mappings cache for the filter expression associated with the given alias, else returns the expression from the compilation.

Parameters:

alias - the alias of the queried object

Returns:

the filter expression of a query

skipRelationship

public boolean skipRelationship(org.datanucleus.metadata.AbstractClassMetaData cmd,
                                int fieldNum)

Determines whether to skip querying for relationship fields by comparing the current depth of the query to the maximum.

Parameters:

cmd - the class with the relationship fields (either OneToMany or ManyToOne)

fieldNum - the number of the relationship field

Returns:

true if the current depth of the query is greater or equal to the maximum depth we can fetch