Package org.apache.cayenne.access.translator.select

Class QueryAssembler

java.lang.Object

org.apache.cayenne.access.translator.select.QueryAssembler

Direct Known Subclasses:

DefaultSelectTranslator

public abstract class QueryAssembler
extends Object

Abstract superclass of Query translators.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static interface	QueryAssembler.AddBindingListener

Field Summary

Fields

Modifier and Type	Field	Description
protected DbAdapter	adapter
protected QueryAssembler.AddBindingListener	addBindingListener
protected List<DbAttributeBinding>	bindings
protected EntityResolver	entityResolver
protected Query	query
protected QueryMetadata	queryMetadata
protected String	sql
protected boolean	translated

Constructor Summary

Constructors

Constructor	Description
QueryAssembler(Query query, DbAdapter adapter, EntityResolver entityResolver)

Method Summary

Modifier and Type	Method	Description
void	addToParamList(DbAttribute dbAttr, Object anObject)	Registers anObject as a PreparedStatement parameter.
abstract void	dbRelationshipAdded(DbRelationship relationship, JoinType joinType, String joinSplitAlias)	Appends a join with given semantics to the query.
protected abstract void	doTranslate()
protected void	ensureTranslated()
DbAdapter	getAdapter()
abstract String	getAliasForExpression(Expression exp)
DbAttributeBinding[]	getBindings()
abstract String	getCurrentAlias()	Returns an alias of the table which is currently at the top of the join stack.
EntityResolver	getEntityResolver()
protected Map<String,String>	getPathAliases()	Returns aliases for the path splits defined in the query.
Query	getQuery()	Returns query object being processed.
QueryMetadata	getQueryMetadata()
String	getSql()	Translates query into an SQL string formatted to use in a PreparedStatement.
abstract void	resetJoinStack()	A callback invoked by a child qualifier or ordering processor allowing query assembler to reset its join stack.
void	setAddBindingListener(QueryAssembler.AddBindingListener addBindingListener)
boolean	supportsTableAliases()	Returns true if table aliases are supported.

Methods inherited from class java.lang.Object

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

Field Detail

query

protected Query query

queryMetadata

protected QueryMetadata queryMetadata

translated

protected boolean translated

sql

protected String sql

adapter

protected DbAdapter adapter

entityResolver

protected EntityResolver entityResolver

bindings

protected List<DbAttributeBinding> bindings

addBindingListener

protected QueryAssembler.AddBindingListener addBindingListener

Since:

4.0

Constructor Detail

QueryAssembler

public QueryAssembler(Query query,
                      DbAdapter adapter,
                      EntityResolver entityResolver)

Since:

4.0

Method Detail

getPathAliases

protected Map<String,String> getPathAliases()

Returns aliases for the path splits defined in the query.

Since:

3.0

getEntityResolver

public EntityResolver getEntityResolver()

getAdapter

public DbAdapter getAdapter()

getQuery

public Query getQuery()

Returns query object being processed.

getQueryMetadata

public QueryMetadata getQueryMetadata()

resetJoinStack

public abstract void resetJoinStack()

A callback invoked by a child qualifier or ordering processor allowing query assembler to reset its join stack.

Since:

3.0

getCurrentAlias

public abstract String getCurrentAlias()

Returns an alias of the table which is currently at the top of the join stack.

Since:

3.0

dbRelationshipAdded

public abstract void dbRelationshipAdded(DbRelationship relationship,
                                         JoinType joinType,
                                         String joinSplitAlias)

Appends a join with given semantics to the query.

Since:

3.0

getSql

public String getSql()

Translates query into an SQL string formatted to use in a PreparedStatement.

ensureTranslated

protected void ensureTranslated()

Since:

4.0

doTranslate

protected abstract void doTranslate()

Since:

4.0

supportsTableAliases

public boolean supportsTableAliases()

Returns true if table aliases are supported. Default implementation returns false.

addToParamList

public void addToParamList(DbAttribute dbAttr,
                           Object anObject)

Registers anObject as a PreparedStatement parameter.

Parameters:

anObject - object that represents a value of DbAttribute

dbAttr - DbAttribute being processed.

getBindings

public DbAttributeBinding[] getBindings()

Since:

4.0

getAliasForExpression

public abstract String getAliasForExpression(Expression exp)

Since:

4.0

setAddBindingListener

public void setAddBindingListener(QueryAssembler.AddBindingListener addBindingListener)

Since:

4.0