com.geoway.mobile.datasources

类 OGRVectorDataSource

java.lang.Object

com.geoway.mobile.datasources.VectorDataSource

com.geoway.mobile.datasources.OGRVectorDataSource

public class OGRVectorDataSource
extends VectorDataSource

High-level vector element data source that supports various OGR data formats.
Shapefiles, GeoJSON, KML files can be used using this data source.

字段概要

从类继承的字段 com.geoway.mobile.datasources.VectorDataSource

swigCMemOwn

构造器概要

构造器

构造器和说明
OGRVectorDataSource(long cPtr, boolean cMemoryOwn)
OGRVectorDataSource(Projection projection, StyleSelector styleSelector, OGRVectorDataBase dataBase, int layerIndex) Constructs a new OGR data source given style selector, OGR database and layer index in database.
OGRVectorDataSource(Projection projection, StyleSelector styleSelector, java.lang.String fileName) Constructs a new OGR data source given style selector and OGR supported data file.

方法概要

限定符和类型	方法和说明
void	add(VectorElement element) Adds a vector element to the data source.
VectorElementVector	commit() Commits all changes to actual persistent data source.
boolean	createField(java.lang.String name, OGRFieldType type, int width) Creates a new field with specified name and type.
void	delete()
boolean	deleteField(int index) Deletes an existing field at specified index.
protected void	finalize()
java.lang.String	getCodePage() Returns the current code page used for decoding DBF text data.
static java.lang.String	getConfigOption(java.lang.String name) Returns the value of global OGR configuration option.
static long	getCPtr(OGRVectorDataSource obj)
MapBounds	getDataExtent() Returns the extent of this data source.
int	getFeatureCount() Returns the total feature count for this data source.
StringVector	getFieldNames() Returns the list of existing fields of the data source.
GeometrySimplifier	getGeometrySimplifier() Returns the active geometry simplifier of the data source.
OGRGeometryType	getGeometryType() Returns the geometry type of the data source.
void	intersection(VectorElement input, VectorElementVector listOutPut)
boolean	isCommitted() Returns whether all changes to data source elements have been committed.
VectorData	loadElements(CullState cullState) Loads all the elements within the defined envelope.
VectorElementVector	query(java.lang.String strSql, int limit)
boolean	remove(VectorElement element) Removes a vector element from the data source.
VectorElementVector	rollback() Rolls back all local changes to the data source.
void	setCodePage(java.lang.String codePage) Specifies the code page to use for decoding DBF text data.
static void	setConfigOption(java.lang.String name, java.lang.String value) Sets global OGR configuration option.
void	setGeometrySimplifier(GeometrySimplifier simplifier) Attaches geometry simplifier to the data source.
static OGRVectorDataSource	swigCreatePolymorphicInstance(long cPtr, boolean cMemoryOwn) Creates a polymorphic instance of the given native object.
protected void	swigDirectorDisconnect()
java.lang.String	swigGetClassName() Returns the actual class name of this object.
java.lang.Object	swigGetDirectorObject() Returns the connected director object.
void	swigReleaseOwnership()
void	swigTakeOwnership()
boolean	testCapability(java.lang.String capability) Tests the data source capability.

从类继承的方法 com.geoway.mobile.datasources.VectorDataSource

getCPtr, getProjection, notifyElementChanged, notifyElementsChanged, notifyElementsChanged

从类继承的方法 java.lang.Object

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

构造器详细资料

OGRVectorDataSource

public OGRVectorDataSource(long cPtr,
                           boolean cMemoryOwn)

OGRVectorDataSource

public OGRVectorDataSource(Projection projection,
                           StyleSelector styleSelector,
                           java.lang.String fileName)

Constructs a new OGR data source given style selector and OGR supported data file.
If the file contains multiple layers, only the first layer is used. Note: data source is opened in read-only mode.

参数:

projection - The projection to use for data coordinates. Note that if actual data is in different coordinates, coordinates will be re-projected.

styleSelector - The style selector to use when loading geometry from OGR file.

fileName - The full path of the data file

抛出:

java.lang.Exception - If the file could not be opened.

OGRVectorDataSource

public OGRVectorDataSource(Projection projection,
                           StyleSelector styleSelector,
                           OGRVectorDataBase dataBase,
                           int layerIndex)

Constructs a new OGR data source given style selector, OGR database and layer index in database.
Note: if the database is opened in writable mode, the layer can be modified.

参数:

projection - The projection to use for data coordinates. Note that if actual data is in different coordinates, coordinates will be re-projected.

styleSelector - The style selector to use when loading geometry from OGR file.

dataBase - The database for this data source

layerIndex - The layer to use (layer names are available from database)

方法详细资料

getCPtr

public static long getCPtr(OGRVectorDataSource obj)

finalize

protected void finalize()

覆盖:

finalize 在类中 VectorDataSource

delete

public void delete()

覆盖:

delete 在类中 VectorDataSource

swigDirectorDisconnect

protected void swigDirectorDisconnect()

覆盖:

swigDirectorDisconnect 在类中 VectorDataSource

swigReleaseOwnership

public void swigReleaseOwnership()

覆盖:

swigReleaseOwnership 在类中 VectorDataSource

swigTakeOwnership

public void swigTakeOwnership()

覆盖:

swigTakeOwnership 在类中 VectorDataSource

swigCreatePolymorphicInstance

public static OGRVectorDataSource swigCreatePolymorphicInstance(long cPtr,
                                                                boolean cMemoryOwn)

Creates a polymorphic instance of the given native object. This is used internally by the SDK.

参数:

cPtr - The native pointer of the instance.

cMemoryOwn - The ownership flag.

返回:

The created instance.

getCodePage

public java.lang.String getCodePage()

Returns the current code page used for decoding DBF text data. The default is ISO-8859-1.

返回:

The current code page for text data.

setCodePage

public void setCodePage(java.lang.String codePage)

Specifies the code page to use for decoding DBF text data.

参数:

codePage - The codepage to use (for example, "CP1254", or any other iconv encoding)

getGeometrySimplifier

public GeometrySimplifier getGeometrySimplifier()

Returns the active geometry simplifier of the data source.

返回:

The current geometry simplifier (can be null)

setGeometrySimplifier

public void setGeometrySimplifier(GeometrySimplifier simplifier)

Attaches geometry simplifier to the data source. If the specified simplifier is null, detaches any active simplifier.

参数:

simplifier - The new geometry simplifier to use (can be null).

getDataExtent

public MapBounds getDataExtent()

Returns the extent of this data source. Extent is the minimal bounding box encompassing all the elements.

返回:

The minimal bounding box for the elements.

getFeatureCount

public int getFeatureCount()

Returns the total feature count for this data source.

返回:

The feature count for the data source.

getGeometryType

public OGRGeometryType getGeometryType()

Returns the geometry type of the data source.

返回:

The geometry type of the data source (layer).

add

public void add(VectorElement element)

Adds a vector element to the data source. The vector element's coordinates are expected to be
in the data source's projection's coordinate system. The vector element is not stored in actual
data source persistently until commited.

参数:

element - The vector element to be added.

remove

public boolean remove(VectorElement element)

Removes a vector element from the data source. The vector element is not removed persistently from actual
data source until commited.

参数:

element - The vector element to be removed.

返回:

True if the vector element existed in the data source.

isCommitted

public boolean isCommitted()

Returns whether all changes to data source elements have been committed.

返回:

true if all changes have been committed, false otherwise.

commit

public VectorElementVector commit()

Commits all changes to actual persistent data source.

返回:

The committed vector elements.

rollback

public VectorElementVector rollback()

Rolls back all local changes to the data source.

返回:

The rolled back vector elements.

getFieldNames

public StringVector getFieldNames()

Returns the list of existing fields of the data source.

返回:

The names of the fields.

createField

public boolean createField(java.lang.String name,
                           OGRFieldType type,
                           int width)

Creates a new field with specified name and type.

参数:

name - The name of the field (must be unique)

type - The type of the field.

width - The maximum formatting width (in characters) for string fields. Can be 0 for other field types.

返回:

True if the field was successfully created, false otherwise.

deleteField

public boolean deleteField(int index)

Deletes an existing field at specified index.

参数:

index - The index of the field to delete (starting from 0).

返回:

True if the field was successfully created, false otherwise.

query

public VectorElementVector query(java.lang.String strSql,
                                 int limit)

loadElements

public VectorData loadElements(CullState cullState)

从类复制的说明: VectorDataSource

Loads all the elements within the defined envelope.

覆盖:

loadElements 在类中 VectorDataSource

参数:

cullState - State for describing view parameters and conservative view envelope.

返回:

The vector of loaded vector elements. If no elements are available, null may be returned.

testCapability

public boolean testCapability(java.lang.String capability)

Tests the data source capability.

参数:

capability - The name of the capability (for example, "CreateFeature", "DeleteFeature", etc)

返回:

True when the capability exists, false otherwise.

setConfigOption

public static void setConfigOption(java.lang.String name,
                                   java.lang.String value)

Sets global OGR configuration option. This method can be used to redefine default locale, for example.

参数:

name - The name of the option parameter to set ("SHAPE_ENCODING", for example)

value - The value of the parameter.

getConfigOption

public static java.lang.String getConfigOption(java.lang.String name)

Returns the value of global OGR configuration option.

参数:

name - The name of the the option parameter to read.

返回:

The value of the specified option parameter.

intersection

public void intersection(VectorElement input,
                         VectorElementVector listOutPut)

swigGetClassName

public java.lang.String swigGetClassName()

Returns the actual class name of this object. This is used internally by the SDK.

覆盖:

swigGetClassName 在类中 VectorDataSource

返回:

The class name of this object.

swigGetDirectorObject

public java.lang.Object swigGetDirectorObject()

Returns the connected director object. This is used internally by the SDK.

覆盖:

swigGetDirectorObject 在类中 VectorDataSource

返回:

The connected director object or null if director is not connected.