org.esa.snap.core.datamodel

Class DataNode

java.lang.Object

com.bc.ceres.core.ExtensibleObject

org.esa.snap.core.datamodel.ProductNode

org.esa.snap.core.datamodel.DataNode

All Implemented Interfaces:

Extensible

Direct Known Subclasses:

MetadataAttribute, RasterDataNode

public abstract class DataNode
extends ProductNode

A DataNode is the base class for all nodes within a data product which carry data. The data is represented by an instance of ProductData.

Field Summary

Fields

Modifier and Type	Field and Description
static String	PROPERTY_NAME_DATA
static String	PROPERTY_NAME_READ_ONLY
static String	PROPERTY_NAME_SYNTHETIC
static String	PROPERTY_NAME_UNIT

Fields inherited from class org.esa.snap.core.datamodel.ProductNode

PROPERTY_NAME_DESCRIPTION, PROPERTY_NAME_NAME

Constructor Summary

Constructors

Constructor and Description
DataNode(String name, int dataType, long numElems) Constructs a new data node with the given name, data type and number of elements.
DataNode(String name, ProductData data, boolean readOnly)

Method Summary

Modifier and Type	Method and Description
abstract void	acceptVisitor(ProductVisitor visitor) Accepts the given visitor.
protected void	checkDataCompatibility(ProductData data) Checks if the data that should be used to access the data is compatible with the data this node can hold.
ProductData	createCompatibleProductData(int numElems) Creates product data that is compatible to this dataset's data type.
void	dispose() Releases all of the resources used by this object instance and all of its owned children.
void	fireProductNodeDataChanged() Fires a node data changed event.
ProductData	getData() Gets the data of this data node.
Object	getDataElems() Gets the data elements of this data node.
int	getDataElemSize() Gets the data element size in bytes.
int	getDataType() Gets the data type of this data node.
long	getNumDataElems() Gets the number of data elements in this data node.
long	getRawStorageSize(ProductSubsetDef subsetDef) Gets the estimated size in bytes of this product node.
String	getUnit()
boolean	isFloatingPointType() Tests whether the data type of this node is a floating point type.
boolean	isReadOnly()
boolean	isSynthetic()
void	setData(ProductData data) Sets the data of this data node.
void	setDataElems(Object elems) Sets the data elements of this data node.
void	setReadOnly(boolean readOnly)
void	setSynthetic(boolean synthetic)
void	setUnit(String unit)

Methods inherited from class org.esa.snap.core.datamodel.ProductNode

fireProductNodeChanged, fireProductNodeChanged, getDescription, getDisplayName, getName, getOwner, getProduct, getProductReader, getProductReaderSafe, getProductRefString, getProductSafe, getProductWriter, getProductWriterSafe, getRawStorageSize, isModified, isPartOfSubset, isValidNodeName, removeFromFile, setDescription, setModified, setName, setOwner, toString, updateExpression

Methods inherited from class com.bc.ceres.core.ExtensibleObject

getExtension

Methods inherited from class java.lang.Object

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

Field Detail

PROPERTY_NAME_DATA

public static final String PROPERTY_NAME_DATA

See Also:

Constant Field Values

PROPERTY_NAME_READ_ONLY

public static final String PROPERTY_NAME_READ_ONLY

See Also:

Constant Field Values

PROPERTY_NAME_SYNTHETIC

public static final String PROPERTY_NAME_SYNTHETIC

See Also:

Constant Field Values

PROPERTY_NAME_UNIT

public static final String PROPERTY_NAME_UNIT

See Also:

Constant Field Values

Constructor Detail

DataNode

public DataNode(String name,
                int dataType,
                long numElems)

Constructs a new data node with the given name, data type and number of elements.

DataNode

public DataNode(String name,
                ProductData data,
                boolean readOnly)

Method Detail

getDataType

public int getDataType()

Gets the data type of this data node.

Returns:

the data type which is always one of the multiple ProductData.TYPE_X constants

isFloatingPointType

public boolean isFloatingPointType()

Tests whether the data type of this node is a floating point type.

Returns:

true, if so

getNumDataElems

public long getNumDataElems()

Gets the number of data elements in this data node.

setData

public void setData(ProductData data)

Sets the data of this data node.

getData

public ProductData getData()

Gets the data of this data node.

setDataElems

public void setDataElems(Object elems)

Sets the data elements of this data node.

See Also:

ProductData.setElems(Object)

getDataElems

public Object getDataElems()

Gets the data elements of this data node.

See Also:

ProductData.getElems()

getDataElemSize

public int getDataElemSize()

Gets the data element size in bytes.

See Also:

ProductData.getElemSize(int)

setReadOnly

public void setReadOnly(boolean readOnly)

isReadOnly

public boolean isReadOnly()

setUnit

public void setUnit(String unit)

getUnit

public String getUnit()

isSynthetic

public boolean isSynthetic()

setSynthetic

public void setSynthetic(boolean synthetic)

fireProductNodeDataChanged

public void fireProductNodeDataChanged()

Fires a node data changed event. This method is called after the data of this data node changed.

checkDataCompatibility

protected void checkDataCompatibility(ProductData data)
                               throws IllegalArgumentException

Checks if the data that should be used to access the data is compatible with the data this node can hold.

Parameters:

data - the data to be checked for compatibility

Throws:

IllegalArgumentException - if data is invalid.

acceptVisitor

public abstract void acceptVisitor(ProductVisitor visitor)

Accepts the given visitor. This method implements the well known 'Visitor' design pattern of the gang-of-four. The visitor pattern allows to define new operations on the product data model without the need to add more code to it. The new operation is implemented by the visitor.

Specified by:

acceptVisitor in class ProductNode

Parameters:

visitor - the visitor, must not be null

getRawStorageSize

public long getRawStorageSize(ProductSubsetDef subsetDef)

Gets the estimated size in bytes of this product node.

Specified by:

getRawStorageSize in class ProductNode

Parameters:

subsetDef - if not null the subset may limit the size returned

Returns:

the size in bytes.

dispose

public void dispose()

Releases all of the resources used by this object instance and all of its owned children. Its primary use is to allow the garbage collector to perform a vanilla job.

This method should be called only if it is for sure that this object instance will never be used again. The results of referencing an instance of this class after a call to dispose() are undefined.

Overrides of this method should always call super.dispose(); after disposing this instance.

Overrides:

dispose in class ProductNode

createCompatibleProductData

public ProductData createCompatibleProductData(int numElems)

Creates product data that is compatible to this dataset's data type. The data buffer returned contains exactly numElems elements of a compatible data type.

Parameters:

numElems - the number of elements, must not be less than one

Returns:

product data compatible with this data node