org.apache.wicket.markup.html.link

Class DownloadLink

java.lang.Object

org.apache.wicket.Component

org.apache.wicket.MarkupContainer

org.apache.wicket.markup.html.WebMarkupContainer

org.apache.wicket.markup.html.link.AbstractLink

org.apache.wicket.markup.html.link.Link<File>

org.apache.wicket.markup.html.link.DownloadLink

All Implemented Interfaces:

Serializable, Iterable<Component>, IEventSink, IEventSource, IConverterLocator, IGenericComponent<File>, IRequestListener, IHeaderContributor, ILinkListener, IRequestableComponent, IHierarchical<Component>, IClusterable

public class DownloadLink
extends Link<File>

A link that streams a file to the client. When clicked this link will prompt the save as dialog in the browser. NOTICE that this link will lock the page. That means only one link from the page can be downloaded at a time, and also while the download happens the page cannot be accessed by other threads. If you need to stream multiple files concurrently without blocking then you should use shared resources or a non-wicket servlet.

Author:

Igor Vaynberg (ivaynberg)

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.wicket.Component

ENABLE, FLAG_AFTER_RENDERING, FLAG_INITIALIZED, FLAG_PREPARED_FOR_RENDER, FLAG_REMOVING_FROM_HIERARCHY, FLAG_RENDERING, FLAG_RESERVED1, FLAG_RESERVED2, FLAG_RESERVED3, FLAG_RESERVED4, FLAG_RESERVED5, FLAG_RESERVED8, PARENT_PATH, PATH_SEPARATOR, RENDER, RFLAG_CONTAINER_DEQUEING

Fields inherited from interface org.apache.wicket.markup.html.link.ILinkListener

INTERFACE

Constructor Summary

Constructors

Constructor and Description
DownloadLink(String id, File file) Constructor.
DownloadLink(String id, File file, String fileName) Constructor
DownloadLink(String id, IModel<File> model) Constructor.
DownloadLink(String id, IModel<File> fileModel, IModel<String> fileNameModel) Constructor.
DownloadLink(String id, IModel<File> model, String fileName) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	detachModels() Detaches all models
void	onClick() Called when a link is clicked.
DownloadLink	setCacheDuration(Duration duration) Sets the duration for which the file resource should be cached by the client.
DownloadLink	setDeleteAfterDownload(boolean deleteAfter) USE THIS METHOD WITH CAUTION! If true, the file will be deleted! The recommended way to use this setting, is to set this DownloadLink object's model with a LoadableDetachableModel instance and the resulting file being generated in a temporary folder.

Methods inherited from class org.apache.wicket.markup.html.link.Link

appendAnchor, getAnchor, getAutoEnable, getModel, getModelObject, getOnClickScript, getPopupSettings, getStatelessHint, getURL, isEnabled, linksTo, onComponentTag, onLinkClicked, setAnchor, setAutoEnable, setModel, setModelObject, setPopupSettings

Methods inherited from class org.apache.wicket.markup.html.link.AbstractLink

disableLink, getBody, onComponentTagBody, onDetach, setBody

Methods inherited from class org.apache.wicket.markup.html.WebMarkupContainer

getWebApplication, getWebPage, getWebRequest, getWebResponse, getWebSession

Methods inherited from class org.apache.wicket.MarkupContainer

add, addDequeuedComponent, addOrReplace, autoAdd, canDequeueTag, contains, dequeue, dequeue, dequeuePreamble, findComponentToDequeue, get, get, getAssociatedMarkup, getAssociatedMarkupStream, getMarkup, getMarkupType, getRegionMarkup, internalAdd, internalInitialize, iterator, iterator, newDequeueContext, onAfterRenderChildren, onInitialize, onRender, queue, remove, remove, removeAll, renderAll, renderAssociatedMarkup, renderNext, replace, setDefaultModel, size, swap, toString, toString, visitChildren, visitChildren, visitChildren, visitChildren

Methods inherited from class org.apache.wicket.Component

add, addStateChange, afterRender, beforeRender, canCallListenerInterface, canCallListenerInterfaceAfterExpiry, checkComponentTag, checkComponentTagAttribute, checkHierarchyChange, clearOriginalDestination, configure, continueToOriginalDestination, createConverter, debug, detach, detachModel, determineVisibility, error, exceptionMessage, fatal, findMarkupStream, findPage, findParent, findParentWithAssociatedMarkup, getAjaxRegionMarkupId, getApplication, getBehaviorById, getBehaviorId, getBehaviors, getBehaviors, getClassRelativePath, getConverter, getDefaultModel, getDefaultModelObject, getDefaultModelObjectAsString, getDefaultModelObjectAsString, getEscapeModelStrings, getFeedbackMessages, getFlag, getId, getInnermostModel, getInnermostModel, getLocale, getLocalizer, getMarkup, getMarkupAttributes, getMarkupId, getMarkupId, getMarkupIdFromMarkup, getMarkupIdImpl, getMarkupSourcingStrategy, getMetaData, getModelComparator, getOutputMarkupId, getOutputMarkupPlaceholderTag, getPage, getPageRelativePath, getParent, getPath, getRenderBodyOnly, getRequest, getRequestCycle, getRequestFlag, getResponse, getSession, getSizeInBytes, getString, getString, getString, getStyle, getVariation, hasBeenRendered, hasErrorMessage, hasFeedbackMessage, info, initModel, internalOnModelChanged, internalPrepareForRender, internalRenderComponent, internalRenderHead, isActionAuthorized, isAuto, isBehaviorAccepted, isEnableAllowed, isEnabledInHierarchy, isIgnoreAttributeModifier, isRenderAllowed, isRendering, isStateless, isVersioned, isVisibilityAllowed, isVisible, isVisibleInHierarchy, markRendering, modelChanged, modelChanging, newMarkupSourcingStrategy, onAfterRender, onBeforeRender, onConfigure, onEvent, onModelChanged, onModelChanging, onReAdd, onRemove, prepareForRender, redirectToInterceptPage, remove, remove, render, renderComponentTag, rendered, renderHead, renderHead, renderPlaceholderTag, replaceComponentTagBody, replaceWith, sameInnermostModel, sameInnermostModel, send, setAuto, setDefaultModelObject, setEnabled, setEscapeModelStrings, setFlag, setIgnoreAttributeModifier, setMarkup, setMarkupId, setMarkupIdImpl, setMetaData, setOutputMarkupId, setOutputMarkupPlaceholderTag, setParent, setRenderBodyOnly, setRequestFlag, setResponsePage, setResponsePage, setResponsePage, setVersioned, setVisibilityAllowed, setVisible, success, urlFor, urlFor, urlFor, urlFor, urlFor, visitParents, visitParents, warn, wrap

Methods inherited from class java.lang.Object

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

Constructor Detail

DownloadLink

public DownloadLink(String id,
            File file)

Constructor. File name used will be the result of file.getName()

Parameters:

id - component id

file - file to stream to client

DownloadLink

public DownloadLink(String id,
            IModel<File> model)

Constructor. File name used will be the result of file.getName()

Parameters:

id - component id

model - model that contains the file object

DownloadLink

public DownloadLink(String id,
            IModel<File> model,
            String fileName)

Constructor. File name used will be the result of file.getName()

Parameters:

id - component id

model - model that contains the file object

fileName - name of the file

DownloadLink

public DownloadLink(String id,
            File file,
            String fileName)

Constructor

Parameters:

id - component id

file - file to stream to client

fileName - name of the file

DownloadLink

public DownloadLink(String id,
            IModel<File> fileModel,
            IModel<String> fileNameModel)

Constructor. File name used will be the result of file.getName()

Parameters:

id - component id

fileModel - model that contains the file object

fileNameModel - model that provides the file name to use in the response headers

Method Detail

detachModels

public void detachModels()

Description copied from class: Component

Detaches all models

Overrides:

detachModels in class Component

onClick

public void onClick()

Description copied from class: Link

Called when a link is clicked.

Specified by:

onClick in class Link<File>

setDeleteAfterDownload

public final DownloadLink setDeleteAfterDownload(boolean deleteAfter)

USE THIS METHOD WITH CAUTION! If true, the file will be deleted! The recommended way to use this setting, is to set this DownloadLink object's model with a LoadableDetachableModel instance and the resulting file being generated in a temporary folder.

Parameters:

deleteAfter - true to delete file after download succeeds

Returns:

this component

setCacheDuration

public DownloadLink setCacheDuration(Duration duration)

Sets the duration for which the file resource should be cached by the client.

Parameters:

duration - the duration to cache

Returns:

this component.