ome.services.query

Class QuerySource

java.lang.Object

ome.services.query.QuerySource

Direct Known Subclasses:

ClassQuerySource, NullQuerySource, StringQuerySource

public abstract class QuerySource
extends Object

contract for any source of queries. Instances should be registered with the QueryFactory in the Spring configuration. QuerySources are responsible for mapping the given query ID to a Query instance (possibly dependent on the Parameters). The order of sources provided to QueryFactory is very important. QuerySources can use any mechanism available to perform the lookup, e.g. a database backend, flat-files, the set of Hibernate named-queries, or concrete classes (see ClassQuerySource).

Since:

OMERO 3.0

Version:

1.0 (Internal version: $Rev$ $Date$)

Author:

Josh Moore, josh.moore@gmx.de

Constructor Summary

Constructors

Constructor and Description
QuerySource()

Method Summary

Modifier and Type	Method and Description
abstract <T> Query<T>	lookup(String queryID, Parameters parameters) map the queryID argument to some Query instance (including null).

Methods inherited from class java.lang.Object

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

Constructor Detail

QuerySource

public QuerySource()

Method Detail

lookup

public abstract <T> Query<T> lookup(String queryID,
                                    Parameters parameters)

map the queryID argument to some Query instance (including null). This mapping can be dependent on the provided Parameters

Type Parameters:

T - the generic type of the return Query. This is usually provided indirectly through the type assignment, e.g. "Query q = ... "

Parameters:

queryID - abstract identifier for the sought query.

parameters - named parameters for lookup and actual bindings.

Returns:

A possible null Query for later execution.