Layer.GetFeatureAttributes Method

Gets information about all attributes that may be present on features in this layer.

Thread safety: This method is, in general, not thread-safe but can in most cases be called without a Guard. Show

GetFeatureAttributes()

Gets information about all attributes that may be present on features in this layer.

Syntax

public FeatureAttributeCollection GetFeatureAttributes ()

Return Value

Type: A collection of FeatureAttribute elements.
A list of feature attributes.

Remarks

This method returns the names and types of attributes that may be present on features returned by GetFeatures. The attributes may originate from different datasets in the layer, or from operators that add new attributes to the features, like AttributeOperator. Every returned attribute must not necessarily be present on every feature.

The method does not provide any information about the values of the attributes, except for their type. If the same attributes occurs for instance in two different datasets, and with different types, the reported type will be Unknown.

In most configurations, the method will find every possible attribute, but if the layer contains CustomDataSetProxy CustomOperatorProxy, ScriptOperator or TargetLineOfSightOperator instances, some attributes may be missed.

The same information that this methods returns could also be retrieved using GetFeatures and checking the attributes of every returned features. However, such a query may take a very long time, whereas this method is generally very fast.

Example

 // Get all available feature attribute names
public static StringCollection GetAllAvailableFeatureAttributeNames(Layer layer)
{
    StringCollection attributeNames = new StringCollection();

    // Get all Feature Attributes from the Layer
    FeatureAttributeCollection featureAttributeCollection = layer.GetFeatureAttributes();

    // Loop over all feature attributes and get the attribute name
    foreach (FeatureAttribute featureAttribute in featureAttributeCollection)  
    {
        // Check if the attribute name is already added to the string collection
        string attributeName = featureAttribute.Name.ToString();
        if (!attributeNames.Contains(attributeName))
        {       
            // Add the attribute name to the string collection
            attributeNames.Add(attributeName);        
        }
    }

    // Return the string collection
    return attributeNames;
}

Platforms

Windows, Linux, Android

Layer::getFeatureAttributes Method

Gets information about all attributes that may be present on features in this layer.

Thread safety: This method is, in general, not thread-safe but can in most cases be called without a Guard. Show

getFeatureAttributes()

Gets information about all attributes that may be present on features in this layer.

Syntax

C++

public:
FeatureAttributeCollectionPtr getFeatureAttributes ()

Return Value

Type: A collection of FeatureAttribute elements.
A list of feature attributes.

Remarks

This method returns the names and types of attributes that may be present on features returned by getFeatures. The attributes may originate from different datasets in the layer, or from operators that add new attributes to the features, like AttributeOperator. Every returned attribute must not necessarily be present on every feature.

The same information that this methods returns could also be retrieved using getFeatures and checking the attributes of every returned features. However, such a query may take a very long time, whereas this method is generally very fast.

Example

C++

// Get all available feature attribute names
static StringCollectionPtr getAllAvailableFeatureAttributeNames(LayerPtr layer)
{
    StringCollectionPtr attributeNames = new StringCollection();

    // Get all Feature Attributes from the Layer
    FeatureAttributeCollectionPtr featureAttributeCollection = layer->getFeatureAttributes();

    // Loop over all feature attributes and get the attribute name
    for (uint32_t i = 0; i < featureAttributeCollection->size(); i++)
    {
        // Check if the attribute name is already added to the string collection
        String attributeName = featureAttributeCollection->get(i)->name().toString();
        if (!attributeNames->contains(attributeName))
        {
            // Add the attribute name to the string collection
            attributeNames->add(attributeName);
        }
    }

    // Return the string collection
    return attributeNames;
}

Platforms

Windows, Linux, Android

Layer.getFeatureAttributes Method

Gets information about all attributes that may be present on features in this layer.

Thread safety: This method is, in general, not thread-safe but can in most cases be called without a Guard. Show

getFeatureAttributes()

Gets information about all attributes that may be present on features in this layer.

Syntax

Java

public final FeatureAttributeCollection getFeatureAttributes ()

Return Value

Type: A collection of FeatureAttribute elements.
A list of feature attributes.

Remarks

Example

Java

 // Get all available feature attribute names
public static StringCollection getAllAvailableFeatureAttributeNames(Layer layer)
{
    StringCollection attributeNames = new StringCollection();

    // Get all Feature Attributes from the Layer
    FeatureAttributeCollection featureAttributeCollection = layer.getFeatureAttributes();

    // Loop over all feature attributes and get the attribute name
    for (FeatureAttribute featureAttribute : featureAttributeCollection)  
    {
        // Check if the attribute name is already added to the string collection
        String attributeName = featureAttribute.getName().toString();
        if (!attributeNames.contains(attributeName))        
        {       
            // Add the attribute name to the string collection
            attributeNames.add(attributeName);        
        }
    }

    // Return the string collection
    return attributeNames;
}

Platforms

Windows, Linux, Android

Layer.getFeatureAttributes Method

Gets information about all attributes that may be present on features in this layer.

Thread safety: This method is, in general, not thread-safe but can in most cases be called without a Guard. Show

getFeatureAttributes()

Gets information about all attributes that may be present on features in this layer.

Syntax

Python

FeatureAttributeCollection getFeatureAttributes (  )

Return Value

Type: A collection of FeatureAttribute elements.
A list of feature attributes.

Remarks

Example

Python

# This example is not available in the selected language.

Platforms

Windows, Linux, Android

Layer.GetFeatureAttributes Method

In this article

GetFeatureAttributes()

Syntax

Return Value

Remarks

Example

Platforms

See Also

Reference

Layer::getFeatureAttributes Method

In this article

getFeatureAttributes()

Syntax

Return Value

Remarks

Example

Platforms

See Also

Reference

Layer.getFeatureAttributes Method

In this article

getFeatureAttributes()

Syntax

Return Value

Remarks

Example

Platforms

See Also

Reference

Layer.getFeatureAttributes Method

In this article

getFeatureAttributes()

Syntax

Return Value

Remarks

Example

Platforms

See Also

Reference