ilog.views.maps

Class IlvFeatureAttribute

java.lang.Object

ilog.views.maps.IlvFeatureAttribute

All Implemented Interfaces:

IlvPersistentObject, Serializable

Direct Known Subclasses:

IlvAttributeArray, IlvBooleanAttribute, IlvDAFIFFeature, IlvDoubleAttribute, IlvIntegerAttribute, IlvRasterAltitudeDataSource, IlvStringAttribute

public abstract class IlvFeatureAttribute
extends Object
implements IlvPersistentObject

This class is the base class for the attributes of the map features.

An IlvMapFeature object can have one or more attributes that can be accessed by the getAttributes method. This method returns an IlvFeatureAttributeProperty instance. Map features can be used by user-defined renderers to translate a feature into a graphic object. Feature attributes can also be used in a map application to display attribute values to the user.

The package ilog.views.maps.attribute contains a list of predefined attribute classes to store the most common types of attributes used for map features.

They all have the following properties:

• They are subclasses of IlvFeatureAttribute.
• They are persistent objects, which means that they can be saved to an ivl file.
• They are mutable, which means that their values can be changed. This is to avoid that a new attribute be allocated by the map readers for each feature they read.
• They have a copy method.

Feature attributes can attached to a graphic object using an IlvFeatureAttributeProperty.

Since:

Perforce JViews 3.0

See Also:

ilog.views.maps.attribute, IlvMapFeature, IlvFeatureAttributeProperty, IlvMapFeatureIterator, Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	IlvFeatureAttribute() Creates a new instance of IlvFeatureAttribute.
protected	IlvFeatureAttribute(IlvFeatureAttribute source) Creates a new IlvFeatureAttribute by copying an existing one.
protected	IlvFeatureAttribute(IlvInputStream stream) Reads the object from an IlvInputStream object.

Method Summary

Modifier and Type	Method and Description
abstract IlvFeatureAttribute	copy() Copies the object.
void	write(IlvOutputStream stream) Writes the object to an IlvOutputStream object.

Methods inherited from class java.lang.Object

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

Constructor Detail

IlvFeatureAttribute

protected IlvFeatureAttribute()

Creates a new instance of IlvFeatureAttribute.

IlvFeatureAttribute

protected IlvFeatureAttribute(IlvFeatureAttribute source)

Creates a new IlvFeatureAttribute by copying an existing one.

Parameters:

source - The attribute object that is copied.

IlvFeatureAttribute

protected IlvFeatureAttribute(IlvInputStream stream)
                       throws IlvReadFileException

Reads the object from an IlvInputStream object.

Parameters:

stream - The input stream.

Throws:

IlvReadFileException - if the format is not correct.

Method Detail

write

public void write(IlvOutputStream stream)
           throws IOException

Writes the object to an IlvOutputStream object.

Specified by:

write in interface IlvPersistentObject

Parameters:

stream - The output stream

Throws:

IOException - thrown when an exception occurs during the write operation for this object.

copy

public abstract IlvFeatureAttribute copy()

Copies the object.

Returns:

a copy of this IlvFeatureAttribute.