Package org.apache.cayenne.query

Class AbstractQuery

java.lang.Object

org.apache.cayenne.query.CacheableQuery

org.apache.cayenne.query.AbstractQuery

All Implemented Interfaces:

Serializable, Query

Direct Known Subclasses:

FluentSelect, ProcedureQuery, SelectQuery, SQLTemplate

public abstract class AbstractQuery
extends CacheableQuery

A common superclass of Cayenne queries.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Object	root	The root object this query.

Fields inherited from class org.apache.cayenne.query.CacheableQuery

logger

Constructor Summary

Constructors

Constructor	Description
AbstractQuery()

Method Summary

Modifier and Type	Method	Description
abstract SQLAction	createSQLAction(SQLActionVisitor visitor)	A callback method invoked by Cayenne during the final execution phase of the query run.
QueryMetadata	getMetaData(EntityResolver resolver)	Returns default select parameters.
Object	getRoot()	Returns the root of this query.
void	route(QueryRouter router, EntityResolver resolver, Query substitutedQuery)	Implements default routing mechanism relying on the EntityResolver to find DataMap based on the query root.
void	setRoot(Object value)	Sets the root of the query
String	toString()

Methods inherited from class org.apache.cayenne.query.CacheableQuery

getBaseMetaData, getCacheGroup, getCacheStrategy, setCacheGroup, setCacheStrategy, useLocalCache, useLocalCache, useSharedCache, useSharedCache

Methods inherited from class java.lang.Object

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

Field Details

root

protected Object root

The root object this query. May be an entity name, Java class, ObjEntity or DbEntity, depending on the specific query and how it was constructed.

Constructor Details

AbstractQuery

public AbstractQuery()

Method Details

getMetaData

public QueryMetadata getMetaData(EntityResolver resolver)

Returns default select parameters.

Since:

1.2

getRoot

public Object getRoot()

Returns the root of this query.

setRoot

public void setRoot(Object value)

Sets the root of the query

Parameters:

value - The new root

Throws:

IllegalArgumentException - if value is not a String, ObjEntity, DbEntity, Procedure, DataMap, Class or null.

toString

public String toString()

Overrides:

toString in class Object

createSQLAction

public abstract SQLAction createSQLAction(SQLActionVisitor visitor)

Description copied from interface: Query

A callback method invoked by Cayenne during the final execution phase of the query run. A concrete query implementation is given a chance to decide how it should be handled. Implementors can pick an appropriate method of the SQLActionVisitor to handle itself, create a custom SQLAction of its own, or substitute itself with another query that should be used for SQLAction construction.

Since:

1.2

route

public void route(QueryRouter router,
 EntityResolver resolver,
 Query substitutedQuery)

Implements default routing mechanism relying on the EntityResolver to find DataMap based on the query root. This mechanism should be sufficient for most queries that "know" their root.

Since:

1.2