org.esa.snap.core.datamodel

Class MetadataElement

java.lang.Object

com.bc.ceres.core.ExtensibleObject

org.esa.snap.core.datamodel.ProductNode

org.esa.snap.core.datamodel.MetadataElement

All Implemented Interfaces:

Extensible

Direct Known Subclasses:

SampleCoding

public class MetadataElement
extends ProductNode

A MetadataElement is a data node used to store metadata. Metadata elements can have any number of metadata attributes of the type MetadataAttribute and any number of inner MetadataElements.

Version:

$Revision: 6651 $ $Date: 2009-10-27 12:59:39 +0100 (Di, 27 Okt 2009) $

Field Summary

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

PROPERTY_NAME_DESCRIPTION, PROPERTY_NAME_NAME

Constructor Summary

Constructors

Constructor and Description
MetadataElement(String name) Constructs a new metadata element.

Method Summary

Modifier and Type	Method and Description
void	acceptVisitor(ProductVisitor visitor) Accepts the given visitor.
void	addAttribute(MetadataAttribute attribute) Adds an attribute to this node.
void	addElement(MetadataElement element) Adds the given element to this element.
void	addElementAt(MetadataElement element, int index) Adds the given element to this element at index.
boolean	containsAttribute(String name) Checks whether this node has an element with the given name.
boolean	containsElement(String name) Tests if a element with the given name is contained in this element.
MetadataElement	createDeepClone()
void	dispose() Releases all of the resources used by this object instance and all of its owned children.
MetadataAttribute	getAttribute(String name) Returns the attribute with the given name.
MetadataAttribute	getAttributeAt(int index) Returns the attribute at the given index.
double	getAttributeDouble(String name) Returns the double value of the attribute with the given name.
double	getAttributeDouble(String name, double defaultValue) Returns the double value of the attribute with the given name.
int	getAttributeIndex(MetadataAttribute attribute) Gets the index of the given attribute.
int	getAttributeInt(String name) Returns the integer value of the attribute with the given name.
int	getAttributeInt(String name, int defaultValue) Returns the integer value of the attribute with the given name.
String[]	getAttributeNames() Returns the names of all attributes of this node.
MetadataAttribute[]	getAttributes() Returns an array of attributes contained in this element.
String	getAttributeString(String name) Returns the string value of the attribute with the given name.
String	getAttributeString(String name, String defaultValue) Returns the string value of the attribute with the given name.
ProductData.UTC	getAttributeUTC(String name) Returns the UTC value of the attribute with the given name.
ProductData.UTC	getAttributeUTC(String name, ProductData.UTC defaultValue) Returns the UTC value of the attribute with the given name.
MetadataElement	getElement(String name) Returns the element with the given name.
MetadataElement	getElementAt(int index) Returns the element at the given index.
ProductNodeGroup<MetadataElement>	getElementGroup() Gets the group of child elements.
int	getElementIndex(MetadataElement element) Gets the index of the given element.
String[]	getElementNames() Returns a string array containing the names of the groups contained in this element
MetadataElement[]	getElements() Returns an array of elements contained in this element.
int	getNumAttributes() Returns the number of attributes attached to this node.
int	getNumElements()
MetadataElement	getParentElement()
long	getRawStorageSize(ProductSubsetDef subsetDef) Gets an estimated, raw storage size in bytes of this product node.
boolean	removeAttribute(MetadataAttribute attribute) Removes the given attribute from this annotation.
boolean	removeElement(MetadataElement element) Removes the given element from this element.
void	setAttributeDouble(String name, double value) Sets the attribute with the given name to the given double value.
void	setAttributeInt(String name, int value) Sets the attribute with the given name to the given integer value.
void	setAttributeString(String name, String value) Sets the attribute with the given name to the given string value.
void	setAttributeUTC(String name, ProductData.UTC value) Sets the attribute with the given name to the given utc value.
void	setModified(boolean modified) Sets this node's modified flag.

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, 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

Constructor Detail

MetadataElement

public MetadataElement(String name)

Constructs a new metadata element.

Parameters:

name - the element name

Method Detail

getElementGroup

public ProductNodeGroup<MetadataElement> getElementGroup()

Gets the group of child elements. The method returns null, if this element has no children.

Returns:

The child element group, may be null.

getParentElement

public MetadataElement getParentElement()

addElement

public void addElement(MetadataElement element)

Adds the given element to this element.

Parameters:

element - the element to added, ignored if null

addElementAt

public void addElementAt(MetadataElement element,
                         int index)

Adds the given element to this element at index.

Parameters:

element - the element to added, ignored if null

index - where to put it

removeElement

public boolean removeElement(MetadataElement element)

Removes the given element from this element.

Parameters:

element - the element to be removed, ignored if null

Returns:

true, if so

getNumElements

public int getNumElements()

Returns:

the number of elements contained in this element.

getElementAt

public MetadataElement getElementAt(int index)

Returns the element at the given index.

Parameters:

index - the element index

Returns:

the element at the given index

Throws:

IndexOutOfBoundsException - if the index is out of bounds

getElementNames

public String[] getElementNames()

Returns a string array containing the names of the groups contained in this element

Returns:

a string array containing the names of the groups contained in this element. If this element has no groups a zero-length-array is returned.

getElements

public MetadataElement[] getElements()

Returns an array of elements contained in this element.

Returns:

an array of elements contained in this product. If this element has no elements a zero-length-array is returned.

getElement

public MetadataElement getElement(String name)

Returns the element with the given name.

Parameters:

name - the element name

Returns:

the element with the given name or null if a element with the given name is not contained in this element.

containsElement

public boolean containsElement(String name)

Tests if a element with the given name is contained in this element.

Parameters:

name - the name, must not be null

Returns:

true if a element with the given name is contained in this element, false otherwise

getElementIndex

public int getElementIndex(MetadataElement element)

Gets the index of the given element.

Parameters:

element - The element .

Returns:

The element's index, or -1.

Since:

BEAM 4.7

addAttribute

public void addAttribute(MetadataAttribute attribute)

Adds an attribute to this node.

Parameters:

attribute - the attribute to be added, null is ignored

removeAttribute

public boolean removeAttribute(MetadataAttribute attribute)

Removes the given attribute from this annotation. If an attribute with the same name already exists, the method does nothing.

Parameters:

attribute - the attribute to be removed, null is ignored

Returns:

true if it was removed

getNumAttributes

public int getNumAttributes()

Returns the number of attributes attached to this node.

Returns:

the number of attributes

getAttributeAt

public MetadataAttribute getAttributeAt(int index)

Returns the attribute at the given index.

Parameters:

index - the attribute index

Returns:

the attribute, or null if this node does not contain attributes

Throws:

IndexOutOfBoundsException

getAttributeNames

public String[] getAttributeNames()

Returns the names of all attributes of this node.

Returns:

the attribute name array, never null

getAttributes

public MetadataAttribute[] getAttributes()

Returns an array of attributes contained in this element.

Returns:

an array of attributes contained in this product. If this element has no attributes a zero-length-array is returned.

getAttribute

public MetadataAttribute getAttribute(String name)

Returns the attribute with the given name.

Parameters:

name - the attribute name

Returns:

the attribute with the given name or null if it could not be found

containsAttribute

public boolean containsAttribute(String name)

Checks whether this node has an element with the given name.

Parameters:

name - the attribute name

Returns:

true if so

getAttributeIndex

public int getAttributeIndex(MetadataAttribute attribute)

Gets the index of the given attribute.

Parameters:

attribute - The attribute.

Returns:

The attribute's index, or -1.

Since:

BEAM 4.7

getAttributeDouble

public double getAttributeDouble(String name,
                                 double defaultValue)

Returns the double value of the attribute with the given name.

The given default value is returned if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

defaultValue - the default value

Returns:

the attribute value as double.

Throws:

NumberFormatException - if the attribute type is ASCII but cannot be converted to a number

getAttributeDouble

public double getAttributeDouble(String name)

Returns the double value of the attribute with the given name.

An Exception is thrown if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

Returns:

the attribute value as double.

Throws:

NumberFormatException - if the attribute type is ASCII but cannot be converted to a number

IllegalArgumentException - if an attribute with the given name could not be found

getAttributeUTC

public ProductData.UTC getAttributeUTC(String name,
                                       ProductData.UTC defaultValue)

Returns the UTC value of the attribute with the given name.

The given default value is returned if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

defaultValue - the default value

Returns:

the attribute value as UTC.

getAttributeUTC

public ProductData.UTC getAttributeUTC(String name)

Returns the UTC value of the attribute with the given name.

Parameters:

name - the attribute name

Returns:

the attribute value as UTC.

Throws:

IllegalArgumentException - if an attribute with the given name could not be found

getAttributeInt

public int getAttributeInt(String name,
                           int defaultValue)

Returns the integer value of the attribute with the given name.

The given default value is returned if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

defaultValue - the default value

Returns:

the attribute value as integer.

Throws:

NumberFormatException - if the attribute type is ASCII but cannot be converted to a number

getAttributeInt

public int getAttributeInt(String name)

Returns the integer value of the attribute with the given name.

An Exception is thrown if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

Returns:

the attribute value as integer.

Throws:

NumberFormatException - if the attribute type is ASCII but cannot be converted to a number

IllegalArgumentException - if an attribute with the given name could not be found

setAttributeInt

public void setAttributeInt(String name,
                            int value)

Sets the attribute with the given name to the given integer value.

A new attribute with ProductData.TYPE_INT32 is added to this node if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

value - the new value

setAttributeDouble

public void setAttributeDouble(String name,
                               double value)

Sets the attribute with the given name to the given double value.

A new attribute with ProductData.TYPE_FLOAT64 is added to this node if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

value - the new value

setAttributeUTC

public void setAttributeUTC(String name,
                            ProductData.UTC value)

Sets the attribute with the given name to the given utc value.

A new attribute with ProductData.UTC is added to this node if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

value - the new value

getAttributeString

public String getAttributeString(String name)

Returns the string value of the attribute with the given name.

An Exception is thrown if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

Returns:

the attribute value as integer.

Throws:

IllegalArgumentException - if an attribute with the given name could not be found

getAttributeString

public String getAttributeString(String name,
                                 String defaultValue)

Returns the string value of the attribute with the given name.

The given default value is returned if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

defaultValue - the default value

Returns:

the attribute value as integer.

setAttributeString

public void setAttributeString(String name,
                               String value)

Sets the attribute with the given name to the given string value.

A new attribute with ProductData.TYPE_ASCII is added to this node if an attribute with the given name could not be found in this node.

Parameters:

name - the attribute name

value - the new value

setModified

public void setModified(boolean modified)

Description copied from class: ProductNode

Sets this node's modified flag.

If the modified flag changes to true and this node has an owner, the owner's modified flag is also set to true.

Overrides:

setModified in class ProductNode

Parameters:

modified - whether or not this node is beeing marked as modified.

See Also:

Product.fireNodeChanged(org.esa.snap.core.datamodel.ProductNode, java.lang.String, java.lang.Object, java.lang.Object)

acceptVisitor

public 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.

The method first visits (calls acceptVisitor for) all elements contained in this element and then visits all attributes. Finally the method calls visitor.visit(this).

Specified by:

acceptVisitor in class ProductNode

Parameters:

visitor - the visitor

getRawStorageSize

public long getRawStorageSize(ProductSubsetDef subsetDef)

Gets an estimated, raw storage 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.

createDeepClone

public MetadataElement createDeepClone()

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