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oracle.spatial.georaster
Class JGeoRasterMeta

java.lang.Object
oracle.spatial.georaster.JGeoRasterMeta

public class JGeoRasterMeta

extends java.lang.Object

The GeoRaster Java library defines a full set of Java classes to store and represent all metadata of a GeoRaster object. A hierarchical mapping is built between these Java classes and major XML elements defined in the GeoRaster XML schema as below:

                                     JGeoRasterMeta
                                   (georasterMetadata)
                                            |
      ----------------------------------------------------------------------------------------------
      |            |             |                        |                         |              |
  ObjectInfo   RasterInfo  SpatialReferenceInfo    TemporalReferenceInfo    bandReferenceInfo   LayerInfo
 (objectInfo) (rasterInfo)(spatialReferenceInfo)  (temporalReferenceInfo)  (bandReferenceInfo) (layerInfo)
                                                                                                   |
                                                                                             --------------
                                                                                             |             |
                                                                                         SubLayerInfo    Vector of SubLayerInfo
                                                                                        (objectLayer)    (subLayer)
 

In these Java classes, all necessary methods are created to allow you to get/set value of each attribute defined in the specific mapped XML element, and through hierarchical structure above, you can easily manipulate all metadata, for example, the following sample code is used to get NODATA value defined in the objectLayer

   ...
   //reading a GeoRaster object from database based on a query
   ResultSet rs = statement.executeQuery("SELECT a.georaster FROM georaster_table a where a.georaster.rasterdatatable='RDT' and a.georaster.rasterid=1");
   STRUCT geor = (oracle.sql.STRUCT) rs.getObject(1);
   //construct a JGeoRaster object 
   JGeoRaster geoRaster = new JGeoRaster(geor);
   //get GeoRasterImage instance
   JGeoRasterMeta geoRasterMeta=geoRaster.getMetadataObject();
   //get NODATA value defined in the objectLayer
   Vector nodata=geoRasterMeta.getLayerInfo().getObjectLayer().getNODATAValue();
   ...
 

JGeoRasterMeta is a Java class mapped to the XML element georasterMetadata in the Oracle Spatial GeoRaster metadata, and it is the root access point of the whole hierarchical structure above.

A JGeoRasterMeta object is always associated with a JGeoRaster object; it cannot be constructed directly. When a JGeoRaster is initiated, the metadata XML string will be retrieved from the database server and populated into the JGeoRasterMeta object and other related Java objects. After the JGeoRaster is initiated successfully, the following method defined in the JGeoRaster is used to retrieve an instance of JGeoRasterMeta:

      public JGeoRasterMeta getMetadataObject()
 

Inside the JGeoRasterMeta class, all get***Info() methods are used to get instances of second level XML elements, but there is possibility that the return value is null, because some second level elements are optional in the XML schema, such as bandReferenceInfo. In this case, if you want to add a missing second level element into metadata, all init***Info() methods are designed to construct and add an empty second level element based on default value defined in the XML schema.

In order to avoid mistaken modification on some critical metadata attributes, which might result in raster data corruption, the following attributes are not allowed to be changed in each second level XML element directly:

        DimensionSize
        CellDepth
        Interleaving
        Blocking
        BlockSize
        PyramidLevel
        PyramidResampling
        Compression
 

However, a method init() is defined in the JGeoRasterMeta class, and provides a way to initiate these critical metadata. The init() method actually is a mapping of the server side PL/SQL function createTemplate(), which takes the rasterSpec string to initialize basic metadata.

Method Summary

java.lang.Object[][]	display() Returns a two-dimensional array to list all metadata information.
BandReferenceInfo	getBandReferenceInfo() Returns an BandReferenceInfo object, which represents the XML BandReferenceInfo element, contained in the current instance.
LayerInfo	getLayerInfo() Returns an LayerInfo object, which represents the XML LayerInfo element, contained in the current instance.
ObjectInfo	getObjectInfo() Returns an ObjectInfo object, which represents the XML objectInfo element, contained in the current instance.
RasterInfo	getRasterInfo() Returns an RasterInfo object, which represents the XML RasterInfo element, contained in the current instance.
java.lang.String[]	getSourceInfo() Returns an array of string, which represents the XML SourceInfo nodes, contained in the current instance.
SpatialReferenceInfo	getSpatialReferenceInfo() Returns an SpatialReferenceInfo object, which represents the XML SpatialReferenceInfo element, contained in the current instance.
TemporalReferenceInfo	getTemporalReferenceInfo() Returns an TemporalReferenceInfo object, which represents the XML TemporalReferenceInfo element, contained in the current instance.
java.lang.String	getXMLString() Returns an XML string represented by this GeoRasterMetadata object.
boolean	hasBitmapMask(int layerNo) Returns true if the GeoRaster object has a bitmapMask defined in the layer layerNo
void	init(int rasterType, java.lang.String rasterSpec) Initiates a JGeoRasterMeta object based on a general pattern of metadata of a JGeoRaster object.
BandReferenceInfo	initBandReferenceInfo() If the current instance does not contain a BandReferenceInfo instance, then an empty BandReferenceInfo is created and added to the current instance, otherwise just return current BandReferenceInfo.
LayerInfo	initLayerInfo() If the current instance does not contain a LayerInfo instance, then an empty LayerInfo is created and added to the current instance, otherwise just return current LayerInfo.
ObjectInfo	initObjectInfo() If the current instance does not contain an ObjectInfo instance, then an empty ObjectInfo is created and added to the current instance; otherwise, just return the current ObjectInfo.
RasterInfo	initRasterInfo() If the current instance does not contain a RasterInfo instance, then an empty RasterInfo is created and added to the current instance; otherwise, just return the current RasterInfo.
SpatialReferenceInfo	initSpatialReferenceInfo() If the current instance does not contain a SpatialReferenceInfo instance, then an empty SpatialReferenceInfo is created and added to the current instance, otherwise just return current SpatialReferenceInfo.
TemporalReferenceInfo	initTemporalReferenceInfo() If the current instance does not contain a TemporalReferenceInfo instance, then an empty TemporalReferenceInfo is created and added to the current instance, otherwise just return current TemporalReferenceInfo.
void	setSourceInfo(java.lang.String[] sourceInfo) set sourceInfo by a given array of string
STRUCT	storeToDB() Updates server-side metadata by the XML string generated from this class.
boolean	validate() Validates GeoRaster metadata represented by current instance

Methods inherited from class java.lang.Object

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

Method Detail

getObjectInfo

public ObjectInfo getObjectInfo()

Returns an ObjectInfo object, which represents the XML objectInfo element, contained in the current instance.

Returns:

ObjectInfo object, or null.

See Also:

ObjectInfo, initObjectInfo()

initObjectInfo

public ObjectInfo initObjectInfo()

If the current instance does not contain an ObjectInfo instance, then an empty ObjectInfo is created and added to the current instance; otherwise, just return the current ObjectInfo.

Returns:

the contained ObjectInfo object.

See Also:

ObjectInfo, getObjectInfo()

getRasterInfo

public RasterInfo getRasterInfo()

Returns an RasterInfo object, which represents the XML RasterInfo element, contained in the current instance.

Returns:

RasterInfo object, or null.

See Also:

RasterInfo, initRasterInfo()

initRasterInfo

public RasterInfo initRasterInfo()

If the current instance does not contain a RasterInfo instance, then an empty RasterInfo is created and added to the current instance; otherwise, just return the current RasterInfo.

Returns:

the contained RasterInfo object.

See Also:

RasterInfo, getRasterInfo()

getSpatialReferenceInfo

public SpatialReferenceInfo getSpatialReferenceInfo()

Returns an SpatialReferenceInfo object, which represents the XML SpatialReferenceInfo element, contained in the current instance.

Returns:

SpatialReferenceInfo object, or null.

See Also:

SpatialReferenceInfo, initSpatialReferenceInfo()

initSpatialReferenceInfo

public SpatialReferenceInfo initSpatialReferenceInfo()

If the current instance does not contain a SpatialReferenceInfo instance, then an empty SpatialReferenceInfo is created and added to the current instance, otherwise just return current SpatialReferenceInfo.

Returns:

the contained SpatialReferenceInfo object.

See Also:

SpatialReferenceInfo, getSpatialReferenceInfo()

getTemporalReferenceInfo

public TemporalReferenceInfo getTemporalReferenceInfo()

Returns an TemporalReferenceInfo object, which represents the XML TemporalReferenceInfo element, contained in the current instance.

Returns:

TemporalReferenceInfo object, or null.

See Also:

TemporalReferenceInfo, initTemporalReferenceInfo()

initTemporalReferenceInfo

public TemporalReferenceInfo initTemporalReferenceInfo()

If the current instance does not contain a TemporalReferenceInfo instance, then an empty TemporalReferenceInfo is created and added to the current instance, otherwise just return current TemporalReferenceInfo.

Returns:

the contained TemporalReferenceInfo object.

See Also:

TemporalReferenceInfo, getTemporalReferenceInfo()

getBandReferenceInfo

public BandReferenceInfo getBandReferenceInfo()

Returns an BandReferenceInfo object, which represents the XML BandReferenceInfo element, contained in the current instance.

Returns:

BandReferenceInfo object, or null.

See Also:

BandReferenceInfo, initBandReferenceInfo()

initBandReferenceInfo

public BandReferenceInfo initBandReferenceInfo()

If the current instance does not contain a BandReferenceInfo instance, then an empty BandReferenceInfo is created and added to the current instance, otherwise just return current BandReferenceInfo.

Returns:

the contained TemporalReferenceInfo object.

See Also:

BandReferenceInfo, getBandReferenceInfo()

getLayerInfo

public LayerInfo getLayerInfo()

Returns an LayerInfo object, which represents the XML LayerInfo element, contained in the current instance.

Returns:

LayerInfo object, or null.

See Also:

LayerInfo, initLayerInfo()

initLayerInfo

public LayerInfo initLayerInfo()

If the current instance does not contain a LayerInfo instance, then an empty LayerInfo is created and added to the current instance, otherwise just return current LayerInfo.

Returns:

the contained LayerInfo object.

See Also:

LayerInfo, getLayerInfo()

getSourceInfo

public java.lang.String[] getSourceInfo()

Returns an array of string, which represents the XML SourceInfo nodes, contained in the current instance.

Returns:

array of sourceInfo string, or null.

See Also:

setSourceInfo(java.lang.String[])

setSourceInfo

public void setSourceInfo(java.lang.String[] sourceInfo)

set sourceInfo by a given array of string

Parameters:

sourceInfo - a array of string, which represents sourceInfo.

See Also:

getSourceInfo()

hasBitmapMask

public boolean hasBitmapMask(int layerNo)

Returns true if the GeoRaster object has a bitmapMask defined in the layer layerNo

Parameters:

layerNo - a string, which represents layer number.

Returns:

true, or false.

validate

public boolean validate()
                 throws java.lang.Exception

Validates GeoRaster metadata represented by current instance

Returns:

true or false to indicate if metadata is valid.

Throws:

java.lang.Exception

getXMLString

public java.lang.String getXMLString()
                              throws GeoRasterException

Returns an XML string represented by this GeoRasterMetadata object.

Returns:

a GeoRaster metadata XML string.

Throws:

GeoRasterException

init

public void init(int rasterType,
                 java.lang.String rasterSpec)
          throws GeoRasterException

Initiates a JGeoRasterMeta object based on a general pattern of metadata of a JGeoRaster object.

Parameters:

rasterType - a 5-digit rasterType attribute value

rasterSpec - a string with raster specification parameters. The rasterSpec parameter must be a string that contains one or more of the following keyword-value pairs:

dimSize (for example, dimSize=(256,256,3)): Specifies the row, column, and band dimension sizes. This keyword must be specified and must be consistent with the rasterType parameter.

ultCoord (for example, ultCoord=(0,0,0)): Specifies the upper-left coordinate integer values for the GeoRaster object. The default value is 0 for all the dimensions. The value for the band dimension must be 0.

cellDepth (for example, cellDepth=8BIT_S): Specifies the cell depth of the GeoRaster object. Must be one of the following values (with _U indicating unsigned and _S indicating signed): 1BIT, 2BIT, 4BIT, 8BIT_U, 8BIT_S, 16BIT_U, 16BIT_S, 32BIT_U, 32BIT_S, 32BIT_REAL, or 64BIT_REAL. The default value is 8BIT_U.

interleaving (for example, interleaving=BIP): Specifies the interleaving type. Must be one of the following values: BSQ, BIL, or BIP. The default value is BSQ.

blocking (for example, blocking=TRUE): Specified whether the GeoRaster object is blocked. Must be either TRUE or FALSE. The default value is FALSE if blocksize is not specified.

blocksize (for example, blocksize=(128,128,3)): Specifies the block size for each dimension of the GeoRaster object. The values must be non-negative integers. A zero block size value means the corresponding dimension size is the real value. Is blocking is set to TRUE but blocksize is not specified, the GeoRaster object's blocksize is (256,256,B), where B is the band dimension size.

rLevel (for example, rLevel=2): Specifies the maximum pyramid reduction level. Must be a positive integer. If you specify this keyword, the pyramid type is set to DECREASE in the metadata; otherwise the pyramid type is set to NONE.

resampling (for example, resampling=NN): Specifies the resampling method. Must be one of the following: NN (value of the nearest neighbor cell in the original GeoRaster object), BILINEAR (distance-weighted average of the 4 nearest cells in the original GeoRaster object), AVERAGE4 (simple average of the 4 nearest cells in the original GeoRaster object), AVERAGE16 (simple average of the 16 nearest cells in the original GeoRaster object), CUBIC (cubic convolution of the 16 nearest cells in the original GeoRaster object). This keyword is ignored if rLevel is not set.

compression (for example, compression=JPEG-B): Specifies the compression type of the GeoRaster object. Must be one of the following: NONE, DEFLATE, JPEG-B, or JPEG-F. The default value is NONE.

quality (for example, quality=75): Specifies the JPEG compression quality, which is the degree of lossiness caused by the compression. Must be an integer from 0 (lowest quality) through 100 (highest quality). This keyword is ignored when the compression keyword is not specified or is not set to one of the JPEG types.

Throws:

GeoRasterException

storeToDB

public STRUCT storeToDB()
                 throws java.lang.Exception

Updates server-side metadata by the XML string generated from this class.

Throws:

java.lang.Exception

display

public java.lang.Object[][] display()

Returns a two-dimensional array to list all metadata information.

Returns:

a two-dimensional array.

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