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java.lang.Object | +--com.hp.hpl.mesa.rdf.jena.common.SelectorImpl
A general selector class for use when querying models.
An instance of this class is passed with query calls to models. The model
will use the test method of this class to decide whether
a statement should be included in the selection.
Instances of this class can be provided with subject, predicate and object constraints. If a subject, a predicate or an object are provided, the model implementation may restrict the statements that it tests to statements whose subject, predicate and object match those provided in the constructor. This can provide for considerably more efficient searching. However, the model implementation is not required to do this. If no subject, predicate or object are provided in the constructor, then all statements in the model must be tested.
This class is designed to be subclassed by the application, defining
defining further selection criteria of its own by providing its own
selects method.
The test method first verifies that a statement satisfies
any subject, predicate or object constraints and the calls the
selects method to test for any application supplied constraint. The
default selects method simply returns true.
| Constructor Summary | |
SelectorImpl()
Create a selector. |
|
SelectorImpl(Resource subject,
Property predicate,
boolean object)
Create a selector. |
|
SelectorImpl(Resource subject,
Property predicate,
char object)
Create a selector. |
|
SelectorImpl(Resource subject,
Property predicate,
double object)
Create a selector. |
|
SelectorImpl(Resource subject,
Property predicate,
float object)
Create a selector. |
|
SelectorImpl(Resource subject,
Property predicate,
long object)
Create a selector. |
|
SelectorImpl(Resource subject,
Property predicate,
java.lang.Object object)
Create a selector. |
|
SelectorImpl(Resource subject,
Property predicate,
RDFNode object)
Create a selector. |
|
SelectorImpl(Resource subject,
Property predicate,
java.lang.String object)
Create a selector. |
|
SelectorImpl(Resource subject,
Property predicate,
java.lang.String object,
java.lang.String language)
Create a selector. |
|
| Method Summary | |
RDFNode |
getObject()
Return the object constraint of this selector. |
Property |
getPredicate()
Return the predicate constraint of this selector. |
Resource |
getSubject()
Return the subject constraint of this selector. |
boolean |
selects(Statement s)
This method is designed to be over ridden by subclasses to define application specific constraints on the statements selected. |
boolean |
test(Statement s)
Test whether a statement should be included in a selection. |
| Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public SelectorImpl()
public SelectorImpl(Resource subject,
Property predicate,
RDFNode object)
selects method to those whose subject matches the
subject parameter, whose predicate matches the predicate parameter and whose
object matches the object paramater. Any null parameter is considered to
match anything.
subject - if not null, the subject of selected statements
must equal this argument.predicate - if not null, the predicate of selected statements
must equal this argument.object - if not null, the object of selected statements
must equal this argument.
public SelectorImpl(Resource subject,
Property predicate,
boolean object)
selects method to those whose subject matches the
subject parameter, whose predicate matches the predicate parameter and whose
object matches the object paramater. Any null parameter is considered to
match anything.
subject - if not null, the subject of selected statements
must equal this argument.predicate - if not null, the predicate of selected statements
must equal this argument.object - if not null, the object of selected statements
must equal this argument.
public SelectorImpl(Resource subject,
Property predicate,
long object)
selects method to those whose subject matches the
subject parameter, whose predicate matches the predicate parameter and whose
object matches the object paramater. Any null parameter is considered to
match anything.
subject - if not null, the subject of selected statements
must equal this argument.predicate - if not null, the predicate of selected statements
must equal this argument.object - the object of selected statements
must equal this argument.
public SelectorImpl(Resource subject,
Property predicate,
char object)
selects method to those whose subject matches the
subject parameter, whose predicate matches the predicate parameter and whose
object matches the object paramater. Any null parameter is considered to
match anything.
subject - if not null, the subject of selected statements
must equal this argument.predicate - if not null, the predicate of selected statements
must equal this argument.object - the object of selected statements
must equal this argument.
public SelectorImpl(Resource subject,
Property predicate,
float object)
selects method to those whose subject matches the
subject parameter, whose predicate matches the predicate parameter and whose
object matches the object paramater. Any null parameter is considered to
match anything.
subject - if not null, the subject of selected statements
must equal this argument.predicate - if not null, the predicate of selected statements
must equal this argument.object - the object of selected statements
must equal this argument.
public SelectorImpl(Resource subject,
Property predicate,
double object)
selects method to those whose subject matches the
subject parameter, whose predicate matches the predicate parameter and whose
object matches the object paramater. Any null parameter is considered to
match anything.
subject - if not null, the subject of selected statements
must equal this argument.predicate - if not null, the predicate of selected statements
must equal this argument.object - the object of selected statements
must equal this argument.
public SelectorImpl(Resource subject,
Property predicate,
java.lang.String object)
selects method to those whose subject matches the
subject parameter, whose predicate matches the predicate parameter and whose
object matches the object paramater. Any null parameter is considered to
match anything.
subject - if not null, the subject of selected statements
must equal this argument.predicate - if not null, the predicate of selected statements
must equal this argument.object - the object of selected statements
must equal this argument - a null string matches the empty string
public SelectorImpl(Resource subject,
Property predicate,
java.lang.String object,
java.lang.String language)
selects method to those whose subject matches the
subject parameter, whose predicate matches the predicate parameter and whose
object matches the object paramater. Any null parameter is considered to
match anything.
subject - if not null, the subject of selected statements
must equal this argument.predicate - if not null, the predicate of selected statements
must equal this argument.object - the object of selected statements
must equal this argument - the null string matches the empty stringlanguage - the language of the object constraint
public SelectorImpl(Resource subject,
Property predicate,
java.lang.Object object)
selects method to those whose subject matches the
subject parameter, whose predicate matches the predicate parameter and whose
object matches the object paramater. Any null parameter is considered to
match anything.
subject - if not null, the subject of selected statements
must equal this argument.predicate - if not null, the predicate of selected statements
must equal this argument.object - if not null, the object of selected statements
must equal this argument.| Method Detail |
public Resource getSubject()
public Property getPredicate()
public RDFNode getObject()
public boolean test(Statement s)
selects method.
test in interface Selectors - the statement to be tested
public boolean selects(Statement s)
s - the statement to be tested
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