Package org.alfresco.repo.content

Class AbstractContentStore

java.lang.Object

org.alfresco.repo.content.AbstractContentStore

All Implemented Interfaces:

ContentStore

Direct Known Subclasses:

AggregatingContentStore, FileContentStore, HttpAlfrescoStore

@AlfrescoPublicApi
public abstract class AbstractContentStore
extends Object
implements ContentStore

Base class providing support for different types of content stores.

Since content URLs have to be consistent across all stores for reasons of replication and backup, the most important functionality provided is the generation of new content URLs and the checking of existing URLs.

Implementations must override either of the getWriter methods; getWriter(ContentContext) or getWriterInternal(ContentReader, String).

Author:

Derek Hulley

See Also:

getWriter(org.alfresco.repo.content.ContentContext), getWriterInternal(ContentReader, String)

Field Summary

Fields

Modifier and Type	Field	Description
protected ContentLimitProvider	contentLimitProvider

Fields inherited from interface org.alfresco.repo.content.ContentStore

NEW_CONTENT_CONTEXT, PROTOCOL_DELIMITER

Constructor Summary

Constructors

Constructor	Description
AbstractContentStore()

Method Summary

Modifier and Type	Method	Description
boolean	delete(String contentUrl)	Override if the derived class supports the operation.
boolean	exists(String contentUrl)	Simple implementation that uses the reader's exists method as its implementation.
protected Pair<String,String>	getContentUrlParts(String contentUrl)	Splits the content URL into its component parts as separated by protocol delimiter.
String	getRootLocation()
long	getSpaceFree()
long	getSpaceTotal()
ContentWriter	getWriter(ContentContext context)	An implementation that does some sanity checking before requesting a writer from the store.
protected ContentWriter	getWriterInternal(ContentReader existingContentReader, String newContentUrl)	Implement to supply a store-specific writer for the given existing content and optional target content URL.
boolean	isContentUrlSupported(String contentUrl)	Override this method to supply a efficient and direct check of the URL supplied.
static boolean	isValidContentUrl(String contentUrl)	Checks that the content conforms to the format protocol://identifier as specified in the contract of the ContentStore interface.
void	setContentLimitProvider(ContentLimitProvider contentLimitProvider)	An object that prevents abuse of the underlying store(s)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.alfresco.repo.content.ContentStore

getReader, isWriteSupported

Field Detail

contentLimitProvider

protected ContentLimitProvider contentLimitProvider

Constructor Detail

AbstractContentStore

public AbstractContentStore()

Method Detail

isValidContentUrl

public static final boolean isValidContentUrl(String contentUrl)

Checks that the content conforms to the format protocol://identifier as specified in the contract of the ContentStore interface.

Parameters:

contentUrl - the content URL to check

Returns:

Returns true if the content URL is valid

Since:

2.1

setContentLimitProvider

public void setContentLimitProvider(ContentLimitProvider contentLimitProvider)

An object that prevents abuse of the underlying store(s)

getContentUrlParts

protected Pair<String,String> getContentUrlParts(String contentUrl)

Splits the content URL into its component parts as separated by protocol delimiter.

Parameters:

contentUrl - the content URL to split

Returns:

Returns the protocol and identifier portions of the content URL, both of which will not be null

Throws:

UnsupportedContentUrlException - if the content URL is invalid

Since:

2.1

isContentUrlSupported

public boolean isContentUrlSupported(String contentUrl)

Override this method to supply a efficient and direct check of the URL supplied. The default implementation checks whether ContentStore.getReader(String) throws the UnsupportedContentUrlException exception.

Specified by:

isContentUrlSupported in interface ContentStore

Since:

2.1

delete

public boolean delete(String contentUrl)

Override if the derived class supports the operation.

Specified by:

delete in interface ContentStore

Throws:

UnsupportedOperationException - always

Since:

2.1

getWriterInternal

protected ContentWriter getWriterInternal(ContentReader existingContentReader,
                                          String newContentUrl)

Implement to supply a store-specific writer for the given existing content and optional target content URL.

Parameters:

existingContentReader - a reader onto any content to initialize the new writer with

newContentUrl - an optional target for the new content

Throws:

UnsupportedContentUrlException - if the content URL supplied is not supported by the store

ContentExistsException - if the content URL is already in use

ContentIOException - if an IO error occurs

Since:

2.1

getWriter

public ContentWriter getWriter(ContentContext context)

An implementation that does some sanity checking before requesting a writer from the store. If this method is not overridden, then an implementation of getWriterInternal(ContentReader, String) must be supplied.

Specified by:

getWriter in interface ContentStore

Since:

2.1

See Also:

getWriterInternal(ContentReader, String)

exists

public boolean exists(String contentUrl)

Simple implementation that uses the reader's exists method as its implementation. Override this method if a more efficient implementation is possible.

Specified by:

exists in interface ContentStore

getSpaceFree

public long getSpaceFree()

Specified by:

getSpaceFree in interface ContentStore

Returns:

Returns -1 always

getSpaceTotal

public long getSpaceTotal()

Specified by:

getSpaceTotal in interface ContentStore

Returns:

Returns -1 always

getRootLocation

public String getRootLocation()

Specified by:

getRootLocation in interface ContentStore

Returns:

Returns a '.' (period) always