net.cnri.repository.bdbje

Class BdbjeDigitalObject

java.lang.Object

net.cnri.repository.AbstractDigitalObject

net.cnri.repository.bdbje.BdbjeDigitalObject

All Implemented Interfaces:

DigitalObject, SupportsFastCopyForLayeredRepo

public class BdbjeDigitalObject
extends AbstractDigitalObject
implements DigitalObject, SupportsFastCopyForLayeredRepo

The digital object is stored using the berkeleydb base API. Which is to say it is stored as a series on name value pairs. The attribute keys are composed of the object handle a delimiter and the element and attribute names. This key is byte encoded. See KeyUtil.

Constructor Summary

Constructors

Constructor and Description
BdbjeDigitalObject(BdbjeRepository respository, com.sleepycat.je.Environment dbEnvironment, com.sleepycat.je.Database db, java.lang.String handle, byte[] handleBytes)

Method Summary

Methods

Modifier and Type	Method and Description
void	copyTo(DigitalObject dobj) Copy this digital object (in the bottom repository of a LayeredRepository to another digital object (in the top repository).
DataElement	createDataElement(java.lang.String name) Creates a new data element with the given name in this digital object.
void	delete() Deletes this digital object from the repository through which it is being accessed.
void	deleteAttribute(java.lang.String name) Deletes a particular attribute.
void	deleteAttributes(java.util.List<java.lang.String> names) Deletes multiple attributes.
void	deleteDataElement(java.lang.String name) Deletes any data element of the given name.
java.lang.String	getAttribute(java.lang.String name) Returns the value for a particular attribute
DataElement	getDataElement(java.lang.String name) Returns the data element with the given name.
java.lang.String	getHandle() Returns the identifier for this digital object.
Repository	getRepository() Returns the repository through which this digital object is being accessed.
CloseableIterator<java.util.Map.Entry<java.lang.String,java.lang.String>>	listAttributes() Returns a CloseableIterator view of the attributes of the digital object.
CloseableIterator<java.lang.String>	listDataElementNames() Provides a CloseableIterator view of the names of the data elements in this digital object.
CloseableIterator<DataElement>	listDataElements() Provides a CloseableIterator view of the data elements in this digital object.
void	setAttribute(java.lang.String name, java.lang.String value) Sets a particular attribute.
void	setAttributes(java.util.Map<java.lang.String,java.lang.String> attributes) Sets the value of multiple attributes.
void	setCreatedAndModifiedAttribute()
void	setModifiedAttribute()
boolean	verifyDataElement(java.lang.String name) Verifies whether a data element with the given name exists within this digital object

Methods inherited from class net.cnri.repository.AbstractDigitalObject

equals, getAttributes, getDataElementNames, getDataElements, getOrCreateDataElement, hashCode

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface net.cnri.repository.DigitalObject

getAttributes, getDataElementNames, getDataElements, getOrCreateDataElement

Constructor Detail

BdbjeDigitalObject

public BdbjeDigitalObject(BdbjeRepository respository,
                  com.sleepycat.je.Environment dbEnvironment,
                  com.sleepycat.je.Database db,
                  java.lang.String handle,
                  byte[] handleBytes)
                   throws RepositoryException

Throws:

RepositoryException

Method Detail

getRepository

public Repository getRepository()

Description copied from interface: DigitalObject

Returns the repository through which this digital object is being accessed.

Specified by:

getRepository in interface DigitalObject

Returns:

the repository through which this digital object is being accessed

getHandle

public java.lang.String getHandle()

Description copied from interface: DigitalObject

Returns the identifier for this digital object.

Specified by:

getHandle in interface DigitalObject

Returns:

the identifier for this digital object

setCreatedAndModifiedAttribute

public void setCreatedAndModifiedAttribute()
                                    throws InternalException

Throws:

InternalException

setModifiedAttribute

public void setModifiedAttribute()
                          throws InternalException

Throws:

InternalException

delete

public void delete()
            throws RepositoryException

Description copied from interface: DigitalObject

Deletes this digital object from the repository through which it is being accessed.

Specified by:

delete in interface DigitalObject

Overrides:

delete in class AbstractDigitalObject

Throws:

RepositoryException

listAttributes

public CloseableIterator<java.util.Map.Entry<java.lang.String,java.lang.String>> listAttributes()
                                                                                         throws RepositoryException

Description copied from interface: DigitalObject

Returns a CloseableIterator view of the attributes of the digital object.

Specified by:

listAttributes in interface DigitalObject

Overrides:

listAttributes in class AbstractDigitalObject

Returns:

a CloseableIterator view of the attributes of the digital object.

Throws:

RepositoryException

getAttribute

public java.lang.String getAttribute(java.lang.String name)
                              throws RepositoryException

Description copied from interface: DigitalObject

Returns the value for a particular attribute

Specified by:

getAttribute in interface DigitalObject

Overrides:

getAttribute in class AbstractDigitalObject

Parameters:

name - the attribute name

Returns:

the attribute value

Throws:

RepositoryException

setAttributes

public void setAttributes(java.util.Map<java.lang.String,java.lang.String> attributes)
                   throws RepositoryException

Description copied from interface: DigitalObject

Sets the value of multiple attributes. Attributes mapped to null will be deleted.

Specified by:

setAttributes in interface DigitalObject

Overrides:

setAttributes in class AbstractDigitalObject

Parameters:

attributes - the attributes to set, mapped to their new values

Throws:

RepositoryException

setAttribute

public void setAttribute(java.lang.String name,
                java.lang.String value)
                  throws RepositoryException

Description copied from interface: DigitalObject

Sets a particular attribute.

Specified by:

setAttribute in interface DigitalObject

Parameters:

name - the attribute name

value - the attribute value; if null, the attribute will be deleted.

Throws:

RepositoryException

deleteAttributes

public void deleteAttributes(java.util.List<java.lang.String> names)
                      throws RepositoryException

Description copied from interface: DigitalObject

Deletes multiple attributes.

Specified by:

deleteAttributes in interface DigitalObject

Overrides:

deleteAttributes in class AbstractDigitalObject

Parameters:

names - the names of the attributes to delete

Throws:

RepositoryException

deleteAttribute

public void deleteAttribute(java.lang.String name)
                     throws RepositoryException

Description copied from interface: DigitalObject

Deletes a particular attribute.

Specified by:

deleteAttribute in interface DigitalObject

Parameters:

name - the name of the attribute to delete

Throws:

RepositoryException

verifyDataElement

public boolean verifyDataElement(java.lang.String name)
                          throws RepositoryException

Description copied from interface: DigitalObject

Verifies whether a data element with the given name exists within this digital object

Specified by:

verifyDataElement in interface DigitalObject

Overrides:

verifyDataElement in class AbstractDigitalObject

Parameters:

name - an identifier for a data element

Returns:

whether that data element exists

Throws:

RepositoryException

createDataElement

public DataElement createDataElement(java.lang.String name)
                              throws CreationException,
                                     RepositoryException

Description copied from interface: DigitalObject

Creates a new data element with the given name in this digital object.

Specified by:

createDataElement in interface DigitalObject

Parameters:

name - the identifier for the new data element

Returns:

the newly-created data element

Throws:

CreationException - if a data element with the given name already exists

RepositoryException

getDataElement

public DataElement getDataElement(java.lang.String name)
                           throws RepositoryException

Description copied from interface: DigitalObject

Returns the data element with the given name.

Specified by:

getDataElement in interface DigitalObject

Parameters:

name - the identifier for the data element

Returns:

the data element, or null if no such element exists

Throws:

RepositoryException

deleteDataElement

public void deleteDataElement(java.lang.String name)
                       throws RepositoryException

Description copied from interface: DigitalObject

Deletes any data element of the given name.

Specified by:

deleteDataElement in interface DigitalObject

Overrides:

deleteDataElement in class AbstractDigitalObject

Parameters:

name - the identifier for the data element

Throws:

RepositoryException

listDataElementNames

public CloseableIterator<java.lang.String> listDataElementNames()
                                                         throws RepositoryException

Description copied from interface: DigitalObject

Provides a CloseableIterator view of the names of the data elements in this digital object.

Specified by:

listDataElementNames in interface DigitalObject

Overrides:

listDataElementNames in class AbstractDigitalObject

Throws:

RepositoryException

listDataElements

public CloseableIterator<DataElement> listDataElements()
                                                throws RepositoryException

Description copied from interface: DigitalObject

Provides a CloseableIterator view of the data elements in this digital object.

Specified by:

listDataElements in interface DigitalObject

Overrides:

listDataElements in class AbstractDigitalObject

Throws:

RepositoryException

copyTo

public void copyTo(DigitalObject dobj)
            throws RepositoryException,
                   java.io.IOException

Description copied from interface: SupportsFastCopyForLayeredRepo

Copy this digital object (in the bottom repository of a LayeredRepository to another digital object (in the top repository). For implementations that can be faster than naive copying. In general this does not copy the data of data elements, but sets the attribute LayeredDataElement.ATTRIBUTE_DATA_ELEMENT_MISSING to 1 on each data element not copied.

Specified by:

copyTo in interface SupportsFastCopyForLayeredRepo

Parameters:

dobj - the digital object to copy into

Throws:

RepositoryException

java.io.IOException