org.geotools.data
Class DataUtilities

java.lang.Object
  org.geotools.data.DataUtilities

public class DataUtilities

extends java.lang.Object

Utility functions for use when implementing working with data classes.

Author:

Jody Garnett, Refractions Research

Nested Class Summary

static class	DataUtilities.AbstractFilterVisitor A quick and dirty FilterVisitor.
static class	DataUtilities.Traversal

Constructor Summary

DataUtilities()

Method Summary

static java.lang.String[]	attributeNames(FeatureType featureType)
static java.lang.String[]	attributeNames(Filter filter)
static boolean	attributesEqual(java.lang.Object att, java.lang.Object otherAtt)
static FeatureCollection	collection(Feature[] features)
static int	compare(FeatureType typeA, FeatureType typeB) Compare operation for FeatureType.
static FeatureType	createSubType(FeatureType featureType, java.lang.String[] properties)
static FeatureType	createSubType(FeatureType featureType, java.lang.String[] properties, org.geotools.cs.CoordinateSystem override)
static FeatureType	createType(java.lang.String identification, java.lang.String typeSpec) Utility method for FeatureType construction.
static java.lang.Object	defaultValue(AttributeType attributeType) Provides a defautlValue for attributeType.
static java.lang.Object[]	defaultValues(FeatureType featureType)
static java.lang.Object[]	defaultValues(FeatureType featureType, java.lang.Object[] values)
static boolean	isMatch(AttributeType a, AttributeType b)
static Feature	parse(FeatureType type, java.lang.String fid, java.lang.String[] text)
static FeatureReader	reader(java.util.Collection collection)
static FeatureReader	reader(Feature[] features) Creates a FeatureReader for testing.
static FeatureResults	results(Feature[] featureArray)
static FeatureResults	results(FeatureCollection collection)
static Feature	reType(FeatureType featureType, Feature feature) Creates duplicate of feature adjusted to the provided featureType.
static FeatureSource	source(Feature[] featureArray)
static FeatureSource	source(FeatureCollection collection)
static java.lang.String	spec(FeatureType featureType) Record typeSpec for the provided featureType
static Feature	template(FeatureType featureType) Constructs an empty feature to use as a Template for new content.
static Feature	template(FeatureType featureType, java.lang.Object[] atts)
static Feature	template(FeatureType featureType, java.lang.String featureID)
static Feature	template(FeatureType featureType, java.lang.String featureID, java.lang.Object[] atts)
static void	traverse(Filter filter, FilterVisitor visitor)
static void	traverse(java.util.Set set, FilterVisitor visitor) Performs a depth first traversal on Filter.
static java.util.Set	traverseDepth(Filter filter) Performs a depth first traversal of Filter.

Methods inherited from class java.lang.Object

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

Constructor Detail

DataUtilities

public DataUtilities()

Method Detail

attributeNames

public static java.lang.String[] attributeNames(FeatureType featureType)

attributeNames

public static java.lang.String[] attributeNames(Filter filter)

traverse

public static void traverse(Filter filter,
                            FilterVisitor visitor)

traverse

public static void traverse(java.util.Set set,
                            FilterVisitor visitor)

Performs a depth first traversal on Filter.

Filters can contain Expressions and other Filters, this method will call visitor.visit( Filter ) and visitor.visit( Expression )

Parameters:

set - Set of Filter and Expression information

visitor - Vistor to traverse across set

traverseDepth

public static java.util.Set traverseDepth(Filter filter)

Performs a depth first traversal of Filter.

Parameters:

filter -

Returns:

Set of Filters in traversing filter

compare

public static int compare(FeatureType typeA,
                          FeatureType typeB)

Compare operation for FeatureType.

Results in:

• 1: if typeA is a sub type/reorder/renamespace of typeB
• 0: if typeA and typeB are the same type
• -1: if typeA is not subtype of typeB

Comparison is based on AttributeTypes, an IOException is thrown if the AttributeTypes are not compatiable.

Namespace is not considered in this opperations. You may still need to reType to get the correct namesapce, or reorder.

Parameters:

typeA - FeatureType beind compared

typeB - FeatureType being compared against

Returns:

isMatch

public static boolean isMatch(AttributeType a,
                              AttributeType b)

reType

public static Feature reType(FeatureType featureType,
                             Feature feature)
                      throws IllegalAttributeException

Creates duplicate of feature adjusted to the provided featureType.

Parameters:

featureType - FeatureType requested

feature - Origional Feature from DataStore

Returns:

An instance of featureType based on feature

Throws:

IllegalAttributeException - If opperation could not be performed

template

public static Feature template(FeatureType featureType)
                        throws IllegalAttributeException

Constructs an empty feature to use as a Template for new content.

We may move this functionality to FeatureType.create( null )?

Parameters:

featureType - Type of feature we wish to create

Returns:

A new Feature of type featureType

Throws:

IllegalAttributeException - if we could not create featureType instance with acceptable default values

template

public static Feature template(FeatureType featureType,
                               java.lang.String featureID)
                        throws IllegalAttributeException

Throws:

IllegalAttributeException

defaultValues

public static java.lang.Object[] defaultValues(FeatureType featureType)
                                        throws IllegalAttributeException

Throws:

IllegalAttributeException

template

public static Feature template(FeatureType featureType,
                               java.lang.Object[] atts)
                        throws IllegalAttributeException

Throws:

IllegalAttributeException

template

public static Feature template(FeatureType featureType,
                               java.lang.String featureID,
                               java.lang.Object[] atts)
                        throws IllegalAttributeException

Throws:

IllegalAttributeException

defaultValues

public static java.lang.Object[] defaultValues(FeatureType featureType,
                                               java.lang.Object[] values)
                                        throws IllegalAttributeException

Throws:

IllegalAttributeException

defaultValue

public static java.lang.Object defaultValue(AttributeType attributeType)
                                     throws IllegalAttributeException

Provides a defautlValue for attributeType.

Will return null if attributeType isNillable(), or attempt to use Reflection, or attributeType.parse( null )

Parameters:

attributeType -

Returns:

null for nillable attributeType, attempt at reflection

Throws:

IllegalAttributeException - If value cannot be constructed for attribtueType

reader

public static FeatureReader reader(Feature[] features)
                            throws java.io.IOException

Creates a FeatureReader for testing.

Parameters:

features - Array of features

Returns:

FeatureReader spaning provided feature array

Throws:

java.io.IOException - If provided features Are null or empty

source

public static FeatureSource source(Feature[] featureArray)
                            throws java.io.IOException

Throws:

java.io.IOException

source

public static FeatureSource source(FeatureCollection collection)
                            throws java.io.IOException

Throws:

java.io.IOException

results

public static FeatureResults results(Feature[] featureArray)
                              throws java.io.IOException

Throws:

java.io.IOException

results

public static FeatureResults results(FeatureCollection collection)
                              throws java.io.IOException

Throws:

java.io.IOException

reader

public static FeatureReader reader(java.util.Collection collection)
                            throws java.io.IOException

Throws:

java.io.IOException

collection

public static FeatureCollection collection(Feature[] features)

attributesEqual

public static boolean attributesEqual(java.lang.Object att,
                                      java.lang.Object otherAtt)

createSubType

public static FeatureType createSubType(FeatureType featureType,
                                        java.lang.String[] properties,
                                        org.geotools.cs.CoordinateSystem override)
                                 throws SchemaException

Throws:

SchemaException

createSubType

public static FeatureType createSubType(FeatureType featureType,
                                        java.lang.String[] properties)
                                 throws SchemaException

Throws:

SchemaException

createType

public static FeatureType createType(java.lang.String identification,
                                     java.lang.String typeSpec)
                              throws SchemaException

Utility method for FeatureType construction.

Will parse a String of the form: "name:Type,name2:Type2,..."

Where Type is defined by createAttribute.

You may indicate the default Geometry with an astrix.

Example:name:"",age:0,geom:Geometry,centroid:Point,url:java.io.URL"

Parameters:

identification - identification of FeatureType: (namesapce).typeName

typeSpec - Specification for FeatureType

Returns:

Throws:

SchemaException

parse

public static Feature parse(FeatureType type,
                            java.lang.String fid,
                            java.lang.String[] text)
                     throws IllegalAttributeException

Throws:

IllegalAttributeException

spec

public static java.lang.String spec(FeatureType featureType)

Record typeSpec for the provided featureType