org.mmbase.module.builders
Class ImageCaches

java.lang.Object
  org.mmbase.util.functions.FunctionProvider
      org.mmbase.module.core.MMTable
          org.mmbase.module.core.MMObjectBuilder
              org.mmbase.module.builders.AbstractServletBuilder
                  org.mmbase.module.builders.AbstractImages
                      org.mmbase.module.builders.ImageCaches

All Implemented Interfaces:

EventListener, NodeEventListener, RelationEventListener, ImagesInterface

public class ImageCaches
extends AbstractImages

ImageCaches (aka as 'icaches') is a system-like builder used by builders with the 'Images' class. It contains the converted images.

Version:

$Id: ImageCaches.java 42792 2010-07-02 07:01:27Z michiel $

Author:

Daniel Ockeloen, Michiel Meeuwissen

Nested Class Summary

Nested classes/interfaces inherited from class org.mmbase.module.builders.AbstractImages

AbstractImages.CKeyCache

Field Summary

static String	FIELD_ID
(package private) static String	GUI_IMAGETEMPLATE
static Parameter[]	WAIT_PARAMETERS

Fields inherited from class org.mmbase.module.builders.AbstractImages

DIMENSION_PARAMETERS, FIELD_FILESIZE, FIELD_HEIGHT, FIELD_ITYPE, FIELD_WIDTH, handleCache, HEIGHT_PARAMETERS, IMAGE_HANDLE_FIELDS, WIDTH_PARAMETERS

Fields inherited from class org.mmbase.module.builders.AbstractServletBuilder

externalUrlField, FIELD_FILENAME, FIELD_HANDLE, FIELD_MIMETYPE, FORMAT_PARAMETERS, GUI_PARAMETERS, legalizeFileName, MIMETYPE_PARAMETERS, PROPERTY_EXTERNAL_URL_FIELD, usesBridgeServlet

Fields inherited from class org.mmbase.module.core.MMObjectBuilder

AGE_PARAMETERS, broadCastChanges, DEFAULT_ALINEA, DEFAULT_EOL, description, descriptions, EVENT_TYPE_LOCAL, EVENT_TYPE_REMOTE, FIELD_NUMBER, FIELD_OBJECT_TYPE, FIELD_OWNER, fields, genericBlobCache, getFunctions, GUI_INDICATOR, guiFunction, infoFunction, internalVersion, nodeCache, oType, pluralNames, searchAge, singularNames, SYSTEM_OWNER, TEMPNODE_DEFAULT_SIZE, TMP_FIELD_EXISTS, TMP_FIELD_NUMBER, virtual, WRAP_PARAMETERS, wrapFunction

Fields inherited from class org.mmbase.module.core.MMTable

maxNodesFromQuery, mmb, storageConnector, tableName

Fields inherited from class org.mmbase.util.functions.FunctionProvider

functions

Constructor Summary

ImageCaches()

Method Summary

protected boolean	addFileName(MMObjectNode node, String servlet) Adds a filename to the path to a servlet, unless this does not make sense (not filename can be determined) or it was explicitely set not to, using the servlet context init parameter 'mmbase.servlet.<association>addfilename.
protected void	appendExtension(StringBuilder buf, String ext)
protected Object	executeFunction(MMObjectNode node, String function, List<?> args) Every image of course has a format and a mimetype.
MMObjectNode	getCachedNode(int imageNumber, String template) Finds a icache node in the icaches table
protected Dimension	getDimensionForEmptyHandle(MMObjectNode node) If icache does not yet have a filled handle field, neither filled width/heigh fields (can occur after a update).
StringBuilder	getFileName(MMObjectNode node, StringBuilder buf)
protected String	getGUIIndicatorWithAlt(MMObjectNode node, String alt, Parameters a) The GUI indicator of an image can have an alt-text.
String	getImageFormat(MMObjectNode node) Returns the image format.
protected MMObjectNode	getLegacyCachedNode(int imageNumber, String template) Finds a icache node in the icache table, supposing 'legacy' ckeys (where all +'s are removed).
String	getMimeType(List<String> params)
protected String	getSGUIIndicatorForNode(MMObjectNode node, Parameters a) Returns GUI Indicator for node
protected boolean	handleEmpty(MMObjectNode node) Whether the 'handle' field of this icaches node is to be considered empty, and a conversion must therefor still be triggered.
boolean	init() Read 'externalUrlField' property
int	insert(String owner, MMObjectNode node) Insert a new object (content provided) in the cloud, including an entry for the object alias (if provided).
protected void	invalidate(MMObjectNode imageNode) Invalidate the Image Cache for a specific Node method only accessable on package level, since only Images should call it..
void	removeNode(MMObjectNode node) Override the MMObjectBuilder removeNode, to invalidate the LRU ImageCache, when a node gets deleted.
boolean	waitForConversion(MMObjectNode node) If a icache node is created with empty 'handle' field, then the handle field can be filled automaticly.

Methods inherited from class org.mmbase.module.builders.AbstractImages

checkHandle, getAssociation, getBlobCache, getDefaultImageType, getDefaultPath, getDimension, getFileSize, getHandleFields, getMimeType, getSGUIIndicator, storesDimension, storesFileSize, storesImageType

Methods inherited from class org.mmbase.module.builders.AbstractServletBuilder

commit, getBinary, getDefaultFileName, getGUIIndicator, getGUIIndicator, getServletPath, getServletPath, getSession, getSuperGUIIndicator

Methods inherited from class org.mmbase.module.core.MMObjectBuilder

addEventListener, addField, addLocalObserver, addRemoteObserver, broadcastChanges, checkAddTmpField, clearBlobCache, create, createAlias, createAlias, delete, equals, equals, executeFunction, fieldLocalChanged, getAncestors, getClassName, getConfigFile, getConfigResource, getDataTypeCollector, getDBState, getDBType, getDefaultTeaser, getDefaultUrl, getDescendants, getDescription, getDescription, getDescriptions, getEmptyNode, getField, getFieldNames, getFields, getFields, getFunction, getFunctionParameters, getFunctions, getGUIIndicator, getHTML, getInitParameter, getInitParameters, getInitParameters, getInternalVersion, getList, getLocaleGUIIndicator, getLocaleGUIIndicator, getMachineName, getMaintainer, getNewNode, getNewTmpNode, getNextField, getNextField, getNode, getNode, getNode, getNodeFromCache, getNodeGUIIndicator, getNumber, getObjectType, getObjectValue, getParentBuilder, getPluralName, getPluralName, getPluralNames, getRelations_main, getSearchAge, getShort, getShortedByte, getShortedInputStream, getShortedText, getSingularName, getSingularName, getSingularNames, getSmartPath, getTmpNode, getURLEncode, getValue, getVersion, getWAP, getXMLPath, hasField, hashCode, hashCode, hostname_function, insert, isExtensionOf, isNodeCached, isNull, isVirtual, loadInitParameters, newFunctionInstance, nodeLocalChanged, nodeRemoteChanged, notify, notify, preCommit, process, removeEventListener, removeField, removeLocalObserver, removeRelations, removeRemoteObserver, removeSyncNodes, replace, safeCache, sendFieldChangeSignal, setDefaults, setDescription, setDescriptions, setFields, setInitParameter, setMaintainer, setPluralNames, setSearchAge, setSingularNames, setUniqueValue, setUniqueValue, setValue, setValue, setVersion, setXMLPath, shutdown, testValidData, toString, toString, update, updateFields, wrap

Methods inherited from class org.mmbase.module.core.MMTable

count, count, created, getFullTableName, getMMBase, getNode, getNodes, getNodes, getNodes, getNodeType, getStorageConnector, getTableName, search, searchVector, setMMBase, setTableName, size

Methods inherited from class org.mmbase.util.functions.FunctionProvider

addFunction, createParameters, getFunction, getFunctions, getFunctionValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.mmbase.module.builders.ImagesInterface

getBinary

Field Detail

FIELD_ID

public static final String FIELD_ID

See Also:

Constant Field Values

WAIT_PARAMETERS

public static final Parameter[] WAIT_PARAMETERS

GUI_IMAGETEMPLATE

static final String GUI_IMAGETEMPLATE

See Also:

Constant Field Values

Constructor Detail

ImageCaches

public ImageCaches()

Method Detail

init

public boolean init()

Description copied from class: AbstractServletBuilder

Read 'externalUrlField' property

Overrides:

init in class AbstractServletBuilder

Returns:

true if init was completed, false if uncompleted.

See Also:

MMObjectBuilder.create()

appendExtension

protected void appendExtension(StringBuilder buf,
                               String ext)

Since:

MMBase-1.9.4

getFileName

public StringBuilder getFileName(MMObjectNode node,
                                 StringBuilder buf)

Specified by:

getFileName in interface ImagesInterface

Overrides:

getFileName in class AbstractServletBuilder

addFileName

protected boolean addFileName(MMObjectNode node,
                              String servlet)

Description copied from class: AbstractServletBuilder

Adds a filename to the path to a servlet, unless this does not make sense (not filename can be determined) or it was explicitely set not to, using the servlet context init parameter 'mmbase.servlet.<association>addfilename.

Overrides:

addFileName in class AbstractServletBuilder

getGUIIndicatorWithAlt

protected String getGUIIndicatorWithAlt(MMObjectNode node,
                                        String alt,
                                        Parameters a)

The GUI indicator of an image can have an alt-text.

Specified by:

getGUIIndicatorWithAlt in class AbstractImages

Since:

MMBase-1.6

getSGUIIndicatorForNode

protected String getSGUIIndicatorForNode(MMObjectNode node,
                                         Parameters a)

Description copied from class: AbstractImages

Returns GUI Indicator for node

Overrides:

getSGUIIndicatorForNode in class AbstractImages

handleEmpty

protected boolean handleEmpty(MMObjectNode node)

Whether the 'handle' field of this icaches node is to be considered empty, and a conversion must therefor still be triggered.

Overrides:

handleEmpty in class AbstractImages

Since:

MMBase-1.8.5

waitForConversion

public boolean waitForConversion(MMObjectNode node)

If a icache node is created with empty 'handle' field, then the handle field can be filled automaticly. Sadly, getValue of MMObjectNode cannot be overriden, so it cannot be done completely automaticly, but that may be more transparent anyway. Call this method (perhaps with node.getFunctionValue("wait", null)) before requesting the handle field. This will method will block until the field is filled.

Parameters:

node - A icache node.

getCachedNode

public MMObjectNode getCachedNode(int imageNumber,
                                  String template)

Finds a icache node in the icaches table

Parameters:

imageNumber - The node number of the image for which it must be searched

template - The image conversion template

Returns:

The icache node or null if it did not exist yet.

getLegacyCachedNode

protected MMObjectNode getLegacyCachedNode(int imageNumber,
                                           String template)

Finds a icache node in the icache table, supposing 'legacy' ckeys (where all +'s are removed).

Parameters:

imageNumber - The node number of the image for which it must be searched

template - The image conversion template

Returns:

The icache node or null if it did not exist.

invalidate

protected void invalidate(MMObjectNode imageNode)

Invalidate the Image Cache for a specific Node method only accessable on package level, since only Images should call it..

Parameters:

imageNode - The image node, which is the original of the cached modifications

Since:

MMBase-1.7

removeNode

public void removeNode(MMObjectNode node)

Override the MMObjectBuilder removeNode, to invalidate the LRU ImageCache, when a node gets deleted. Remove a node from the cloud.

Overrides:

removeNode in class MMObjectBuilder

Parameters:

node - The node to remove.

getImageFormat

public String getImageFormat(MMObjectNode node)

Returns the image format.

Specified by:

getImageFormat in interface ImagesInterface

Overrides:

getImageFormat in class AbstractImages

Parameters:

node - The object to use.

getDimensionForEmptyHandle

protected Dimension getDimensionForEmptyHandle(MMObjectNode node)

If icache does not yet have a filled handle field, neither filled width/heigh fields (can occur after a update). The dimension can still be given.

Overrides:

getDimensionForEmptyHandle in class AbstractImages

Since:

MMBase-1.8.1

getMimeType

public String getMimeType(List<String> params)

insert

public int insert(String owner,
                  MMObjectNode node)

Description copied from class: MMObjectBuilder

Insert a new object (content provided) in the cloud, including an entry for the object alias (if provided). This method indirectly calls MMObjectBuilder.preCommit(org.mmbase.module.core.MMObjectNode).

Overrides:

insert in class AbstractServletBuilder

Parameters:

owner - The administrator creating the node

node - The object to insert. The object need be of the same type as the current builder.

Returns:

An int value which is the new object's unique number, -1 if the insert failed.

executeFunction

protected Object executeFunction(MMObjectNode node,
                                 String function,
                                 List<?> args)

Every image of course has a format and a mimetype. Two extra functions to get them.

Overrides:

executeFunction in class AbstractImages

See Also:

MMObjectBuilder.executeFunction(org.mmbase.module.core.MMObjectNode, java.lang.String, java.util.List)