org.eclipse.equinox.p2.query

Class ExpressionMatchQuery<T>

java.lang.Object

org.eclipse.equinox.p2.query.ExpressionMatchQuery<T>

All Implemented Interfaces:

IQueryWithIndex<T>, IMatchQuery<T>, IQuery<T>

Direct Known Subclasses:

ArtifactDescriptorQuery, ArtifactKeyQuery, IUProfilePropertyQuery, OSGiBundleQuery

public class ExpressionMatchQuery<T>
extends Object
implements IMatchQuery<T>, IQueryWithIndex<T>

A query that matches candidates against an expression.

Since:

2.0

Constructor Summary

Constructors

Constructor and Description
ExpressionMatchQuery(Class<? extends T> matchingClass, IExpression expression, Object... parameters)
ExpressionMatchQuery(Class<? extends T> matchingClass, String expression, Object... parameters)

Method Summary

Methods

Modifier and Type	Method and Description
IEvaluationContext	getContext()
IMatchExpression<T>	getExpression() Returns the IExpression backing this query or null if this is not an expression query.
Class<? extends T>	getMatchingClass()
boolean	isMatch(T candidate) Returns whether the given object satisfies the parameters of this query.
IQueryResult<T>	perform(IIndexProvider<T> indexProvider) Evaluates the query using the indexProvider.
IQueryResult<T>	perform(Iterator<T> iterator) Evaluates the query for a specific input.
void	postPerform()
void	prePerform()
void	setIndexProvider(IIndexProvider<T> indexProvider)

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionMatchQuery

public ExpressionMatchQuery(Class<? extends T> matchingClass,
                    IExpression expression,
                    Object... parameters)

ExpressionMatchQuery

public ExpressionMatchQuery(Class<? extends T> matchingClass,
                    String expression,
                    Object... parameters)

Method Detail

getContext

public IEvaluationContext getContext()

getMatchingClass

public Class<? extends T> getMatchingClass()

perform

public IQueryResult<T> perform(IIndexProvider<T> indexProvider)

Description copied from interface: IQueryWithIndex

Evaluates the query using the indexProvider. The query is first analyzed for index candidates (typically expressions like id == <some value>) and if possible, indexes returned by IIndexProvider.getIndex(String) will be used in place of the iterator returned by IIndexProvider.everything().

Specified by:

perform in interface IQueryWithIndex<T>

Parameters:

indexProvider - The provider of the material to evaluate the query on

Returns:

The results of the query.

perform

public IQueryResult<T> perform(Iterator<T> iterator)

Description copied from interface: IQuery

Evaluates the query for a specific input.

Specified by:

perform in interface IQuery<T>

Parameters:

iterator - The elements for which to evaluate the query on

Returns:

The results of the query.

isMatch

public boolean isMatch(T candidate)

Description copied from interface: IMatchQuery

Returns whether the given object satisfies the parameters of this query.

Specified by:

isMatch in interface IMatchQuery<T>

Parameters:

candidate - The object to perform the query against

Returns:

true if the unit satisfies the parameters of this query, and false otherwise

getExpression

public IMatchExpression<T> getExpression()

Description copied from interface: IQuery

Returns the IExpression backing this query or null if this is not an expression query.

Specified by:

getExpression in interface IQuery<T>

Returns:

An expression or null.

setIndexProvider

public void setIndexProvider(IIndexProvider<T> indexProvider)

prePerform

public void prePerform()

postPerform

public void postPerform()