Package org.apache.sis.internal.storage.gpx

Class GroupAsPolylineOperation.Result<G>

java.lang.Object

org.apache.sis.feature.Property

org.apache.sis.feature.Field<V>

org.apache.sis.feature.AbstractAttribute<G>

org.apache.sis.internal.storage.gpx.GroupAsPolylineOperation.Result<G>

Type Parameters:

G - the root geometry class (implementation-dependent).

All Implemented Interfaces:

Serializable

Enclosing class:

GroupAsPolylineOperation

private static final class GroupAsPolylineOperation.Result<G>
extends AbstractAttribute<G>

The attribute resulting from execution if the GroupAsPolylineOperation. The value is computed when first requested, then cached for this Result instance only. Note that the cache is not used when apply(Feature, ParameterValueGroup) is invoked, causing a new value to be computed again. The intent is to behave as if the operation has been executed at apply(…) invocation time, even if we deferred the actual execution.

Field Summary

Fields

Modifier and Type	Field	Description
private final String	association	Name of the property to follow in order to get the geometries to add to a polyline.
private final AbstractFeature	feature	The feature on which to execute the operation.
private G	geometry	The result, computed when first needed.
private static final long	serialVersionUID	For cross-version compatibility.

Constructor Summary

Constructors

Constructor	Description
Result(AbstractFeature feature, String association, DefaultAttributeType<G> result)	Creates a new result for an execution on the given feature.

Method Summary

Modifier and Type	Method	Description
G	getValue()	Computes the geometry from all points or polylines found in the associated feature.
void	setValue(G value)	Does not allow modification of this attribute.

Methods inherited from class org.apache.sis.feature.AbstractAttribute

characteristics, clone, create, getName, getType, getValues, quality, setValues, toString

Methods inherited from class java.lang.Object

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

Field Details

serialVersionUID

private static final long serialVersionUID

For cross-version compatibility.

See Also:

• Constant Field Values

feature

private final AbstractFeature feature

The feature on which to execute the operation.

association

private final String association

Name of the property to follow in order to get the geometries to add to a polyline. This property shall be a feature association, usually with [0 … ∞] multiplicity.

geometry

private transient G geometry

The result, computed when first needed.

Constructor Details

Result

Result(AbstractFeature feature,
 String association,
 DefaultAttributeType<G> result)

Creates a new result for an execution on the given feature. The actual computation is deferred to the first call of getValue().

Method Details

getValue

public G getValue()

Computes the geometry from all points or polylines found in the associated feature.

Specified by:

getValue in class AbstractAttribute<G>

Returns:

the attribute value (may be null).

Throws:

ClassCastException - if a feature, a property value or a geometry is not of the expected class. This exception should not happen since we use feature in contexts where types are known.

See Also:

• AbstractFeature.getPropertyValue(String)

setValue

public void setValue(G value)

Does not allow modification of this attribute.

Specified by:

setValue in class AbstractAttribute<G>

Parameters:

value - the new value, or null for removing all values from this attribute.

See Also:

• AbstractFeature.setPropertyValue(String, Object)