Package org.geotools.metadata

Class AbstractMetadata

Object

AbstractMetadata

Direct Known Subclasses:

ModifiableMetadata

public abstract class AbstractMetadata
extends Object

Base class for metadata implementations. Subclasses must implement the interfaces of some metadata standard. This class uses Java reflection in order to provide default implementation of copy constructor, equals(java.lang.Object) and hashCode() methods.

Since:

2.4

Author:

Martin Desruisseaux (Geomatys)

Field Summary

Fields

Modifier and Type	Field	Description
protected static Logger	LOGGER	The logger for metadata implementation.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractMetadata()	Creates an initially empty metadata.
protected	AbstractMetadata(Object source)	Constructs a metadata entity initialized with the values from the specified metadata.

Method Summary

Modifier and Type	Method	Description
Map<String,Object>	asMap()	Returns a view of this metadata object as a map.
TreeModel	asTree()	Returns a view of this metadata as a tree.
boolean	equals(Object object)	Compares this metadata with the specified object for equality.
Class<?>	getInterface()	Returns the metadata interface implemented by this class.
abstract MetadataStandard	getStandard()	Returns the metadata standard implemented by subclasses.
int	hashCode()	Computes a hash code value for this metadata using Java reflection.
String	toString()	Returns a string representation of this metadata.

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

LOGGER

protected static final Logger LOGGER

The logger for metadata implementation.

Constructor Detail

AbstractMetadata

protected AbstractMetadata()

Creates an initially empty metadata.

AbstractMetadata

protected AbstractMetadata(Object source)
                    throws ClassCastException,
                           UnmodifiableMetadataException

Constructs a metadata entity initialized with the values from the specified metadata. The source metadata must implements the same metadata interface (defined by the standard) than this class, but don't need to be the same implementation class. The copy is performed using Java reflections.

Parameters:

source - The metadata to copy values from.

Throws:

ClassCastException - if the specified metadata don't implements the expected metadata interface.

UnmodifiableMetadataException - if this class don't define set methods corresponding to the get methods found in the implemented interface, or if this instance is not modifiable for some other reason.

Method Detail

getStandard

public abstract MetadataStandard getStandard()

Returns the metadata standard implemented by subclasses.

Returns:

The metadata standard implemented.

getInterface

public Class<?> getInterface()

Returns the metadata interface implemented by this class. It should be one of the interfaces defined in the metadata standard implemented by this class.

Returns:

The standard interface implemented by this implementation class.

asMap

public Map<String,Object> asMap()

Returns a view of this metadata object as a map. The map is backed by this metadata object using Java reflection, so changes in the underlying metadata object are immediately reflected in the map. The keys are the property names as determined by the list of get*() methods declared in the metadata interface.

The map supports the put operations if the underlying metadata object contains {@link #set*(...)} methods.

Returns:

A view of this metadata object as a map.

asTree

public TreeModel asTree()

Returns a view of this metadata as a tree. Note that while TreeModel is defined in the javax.swing.tree package, it can be seen as a data structure independent of Swing. It will not force class loading of Swing framework.

In current implementation, the tree is not live (i.e. changes in metadata are not reflected in the tree). However it may be improved in a future Geotools implementation.

Returns:

A view of this metadata object as a tree.

equals

public boolean equals(Object object)

Compares this metadata with the specified object for equality. The default implementation uses Java reflection. Subclasses may override this method for better performances.

This method performs a deep comparaison (i.e. if this metadata contains other metadata, the comparaison will walk through the other metadata content as well) providing that every childs implement the Object.equals(java.lang.Object) method as well. This is the case by default if every childs are subclasses of AbstractMetadata.

Overrides:

equals in class Object

Parameters:

object - The object to compare with this metadata.

Returns:

true if the given object is equals to this metadata.

hashCode

public int hashCode()

Computes a hash code value for this metadata using Java reflection. The hash code is defined as the sum of hash code values of all non-null properties. This is the same contract than Set.hashCode() and ensure that the hash code value is insensitive to the ordering of properties.

Overrides:

hashCode in class Object

toString

public String toString()

Returns a string representation of this metadata.

Overrides:

toString in class Object