com.adobe.granite.ui.components

Class ComponentHelper

java.lang.Object

com.adobe.granite.ui.components.ComponentHelper

public class ComponentHelper
extends java.lang.Object

A convenient helper for development of Granite UI components that are implemented using JSP.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ComponentHelper.Options An options to be passed to the included resource's renderer.

Constructor Summary

Constructors

Constructor and Description
ComponentHelper(javax.servlet.jsp.PageContext pageContext)

Method Summary

Modifier and Type	Method and Description
DataSource	asDataSource(Resource datasource) Returns the datasource given its datasource resource.
DataSource	asDataSource(Resource datasource, Resource context) Returns the datasource given its datasource resource.
void	call(java.lang.String script, ComponentHelper.Options options) Calls the given script and passes the given options to its renderer.
Resource	consumeLayoutResource() Consumes the current available layout resource for current page.
Tag	consumeTag() Consumes the current available tag for current page.
Config	getConfig() Returns the config of current resource of the page.
ExpressionHelper	getExpressionHelper() Returns the ExpressionHelper appropriate for the current page.
I18n	getI18n() Returns I18n appropriate for the current page.
java.lang.String	getIconClass(java.lang.String icon) Returns the icon class(es) for the given icon string from the content property.
DataSource	getItemDataSource() Returns the datasource for items of the current resource.
DataSource	getItemDataSource(Resource resource) Returns the datasource for items of the given resource.
LayoutBuilder	getLayout() Returns the layout config of current resource of the page.
ComponentHelper.Options	getOptions() Returns the options passed from another page.
java.lang.String	getReadOnlyResourceType() Returns the associated resource type of current resource for the purpose rendering read only version.
java.lang.String	getReadOnlyResourceType(Resource resource) Returns the associated resource type of the given content resource for the purpose rendering read only version.
RenderCondition	getRenderCondition() Returns the render condition of the current resource.
RenderCondition	getRenderCondition(Resource resource) Returns the render condition of the given resource.
RenderCondition	getRenderCondition(Resource resource, boolean cache) Returns the render condition of the given resource.
State	getState() Returns the client state.
Value	getValue() Returns the values that is applicable for the current page.
XSSAPI	getXss() Returns XSSAPI based on the current request.
void	include(Resource resource, ComponentHelper.Options options) Includes the given resource and passes the given options to its renderer.
void	include(Resource resource, java.lang.String resourceType, ComponentHelper.Options options) Includes the given resource with the given resourceType and passes the given options to its renderer.
void	include(Resource resource, java.lang.String resourceType, java.lang.String selectors, ComponentHelper.Options options) Includes the given resource with the given resourceType and passes the given options to its renderer.
void	include(Resource resource, java.lang.String resourceType, Tag tag) Includes the given resource with the given resourceType and passes the given tag to its renderer.
void	include(Resource resource, Tag tag) Includes the given resource and passes the given tag to its renderer.
void	includeForLayout(Resource resource, ComponentHelper.Options options) A convenient overload to includeForLayout(Resource, Resource, Options), with layoutResource as null.
void	includeForLayout(Resource resource, Resource layoutResource, ComponentHelper.Options options) Includes the given resource to be rendered by the given layoutResource.
void	populateCommonAttrs(AttrBuilder attrs) The overload of populateCommonAttrs(AttrBuilder, Resource) using the current request's resource as the source.
void	populateCommonAttrs(AttrBuilder attrs, Resource src) Populates the common attributes to the given AttrBuilder.

Methods inherited from class java.lang.Object

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

Constructor Detail

ComponentHelper

public ComponentHelper(@Nonnull
                       javax.servlet.jsp.PageContext pageContext)

Method Detail

getI18n

@Nonnull
public I18n getI18n()

Returns I18n appropriate for the current page.

Returns:

I18n appropriate for the current page

getXss

@Nonnull
public XSSAPI getXss()

Returns XSSAPI based on the current request.

Returns:

XSSAPI based on the current request

getConfig

@Nonnull
public Config getConfig()

Returns the config of current resource of the page.

Returns:

the config of current resource of the page

getValue

@Nonnull
public Value getValue()

Returns the values that is applicable for the current page.

Returns:

the values that is applicable for the current page

getExpressionHelper

@Nonnull
public ExpressionHelper getExpressionHelper()

Returns the ExpressionHelper appropriate for the current page.

Returns:

the ExpressionHelper appropriate for the current page

getState

@Nonnull
public State getState()

Returns the client state.

Returns:

the client state

consumeTag

@Nonnull
public Tag consumeTag()

Consumes the current available tag for current page. If the request doesn't have the tag applicable to the page, a new tag is created.

There is a mechanism such that a tag can be passed to another page when including that page. This method is intended as a way to consume the tag passed by other page. Component developer can make use this method to get the main tag of the component regardless if there is a tag passed by other page or not.

Returns:

the tag

See Also:

include(Resource, Tag), include(Resource, String, Tag)

consumeLayoutResource

@CheckForNull
public Resource consumeLayoutResource()

Consumes the current available layout resource for current page. This method first attempts to return the layout resource from the options, second it will attempt to return Config.LAYOUT child node, otherwise null is returned.

This method is usually called by layout implementation to get the layout resource that can be passed by the caller.

Returns:

the resource

See Also:

includeForLayout(Resource, Options), includeForLayout(Resource, Resource, Options)

populateCommonAttrs

public void populateCommonAttrs(@Nonnull
                                AttrBuilder attrs)

The overload of populateCommonAttrs(AttrBuilder, Resource) using the current request's resource as the source.

Parameters:

attrs - the attribute builder

populateCommonAttrs

public void populateCommonAttrs(@Nonnull
                                AttrBuilder attrs,
                                @Nonnull
                                Resource src)

Populates the common attributes to the given AttrBuilder.

Currently the following common properties and nodes are read and processed from the given resource:

Name	Type	Description
granite:id	Property: StringEL	The id attribute.
granite:rel	Property: StringEL	The class attribute. This is used to indicate the semantic relationship of the component similar to rel attribute.
granite:class	Property: StringEL	The class attribute.
granite:title	Property: String	The title attribute. This property is i18nable.
granite:hidden	Property: Boolean	The hidden attribute.
granite:itemscope	Property: Boolean	The itemscope attribute.
granite:itemtype	Property: String	The itemtype attribute.
granite:itemprop	Property: String	The itemprop attribute.
granite:data	Node	Each property of this node is converted into a data-* attribute. If the property value is an instance of a String, it will be interpreted as StringEL. The property having a prefixed name is ignored.

Parameters:

attrs - The attribute builder to populate to

src - The resource of the source of the config

getOptions

@Nonnull
public ComponentHelper.Options getOptions()

Returns the options passed from another page. If no options is passed, empty options is returned.

There is a mechanism such that options can be passed to another page when including that page.

Returns:

the options passed from another page. if no options is passed, empty options is returned.

See Also:

include(Resource, Options), include(Resource, String, Options)

getLayout

@Nonnull
public LayoutBuilder getLayout()

Returns the layout config of current resource of the page. This method is setting the default resource type of the layout.

Returns:

the layout config of current resource of the page

See Also:

LayoutBuilder.getResourceType()

getReadOnlyResourceType

@CheckForNull
public java.lang.String getReadOnlyResourceType()

Returns the associated resource type of current resource for the purpose rendering read only version. First the granite:readOnlyResourceType property of the resource type of the current resource (the RT) is used. Otherwise it is defaulted to readonly child resource of the RT.

Returns:

the associated resource type of current resource

getReadOnlyResourceType

@CheckForNull
public java.lang.String getReadOnlyResourceType(@Nonnull
                                                              Resource resource)

Returns the associated resource type of the given content resource for the purpose rendering read only version. First the granite:readOnlyResourceType property of the resource type of the content resource (the RT) is used. Otherwise it is defaulted to readonly child resource of the RT.

Parameters:

resource - the resource

Returns:

the associated resource type of the given content resource

getItemDataSource

@Nonnull
public DataSource getItemDataSource()
                                      throws ServletException,
                                             java.io.IOException

Returns the datasource for items of the current resource. This is an overload of getItemDataSource(Resource) with resource is the current request resource.

Returns:

the data source for items of the current resource

Throws:

ServletException - in case there's a servlet error while fetching data

java.io.IOException - in case there's an i/o error while fetching data

getItemDataSource

@Nonnull
public DataSource getItemDataSource(@Nonnull
                                             Resource resource)
                                      throws ServletException,
                                             java.io.IOException

Returns the datasource for items of the given resource. This method can be used to fetch the items that are specified literally using Config.ITEMS subresource; or specified as datasource using Config.DATASOURCE subresource. If there is no Config.ITEMS or Config.DATASOURCE subresource, then EmptyDataSource is returned. In contrast with asDataSource(Resource, Resource), this method looks for the datasource resource of the given resource. i.e. The given resource is the parent of the items, not the datasource resource itself. The given resource is also used as the context resource when calling asDataSource(Resource, Resource) internally.

Parameters:

resource - the resource

Returns:

the data source for items of the given resource

Throws:

ServletException - in case there's a servlet error while fetching data

java.io.IOException - in case there's an i/o error while fetching data

asDataSource

public DataSource asDataSource(@CheckForNull
                               Resource datasource)
                        throws ServletException,
                               java.io.IOException

Returns the datasource given its datasource resource. This method is an overload of asDataSource(Resource, Resource) with context is null.

Parameters:

datasource - the resource representing the datasource

Returns:

the datasource given its datasource resource

Throws:

ServletException - in case there's a servlet error while fetching data

java.io.IOException - in case there's an i/o error while fetching data

asDataSource

public DataSource asDataSource(@CheckForNull
                               Resource datasource,
                               @CheckForNull
                               Resource context)
                        throws ServletException,
                               java.io.IOException

Returns the datasource given its datasource resource.

Parameters:

datasource - The resource representing the datasource

context - The context resource that is returned when calling SlingHttpServletRequest.getResource() at the datasource implementation. If this is null, the given datasource is used.

Returns:

null if the given datasource is null.

Throws:

ServletException - in case there's a servlet error while fetching data

java.io.IOException - in case there's an i/o error while fetching data

getRenderCondition

@Nonnull
public RenderCondition getRenderCondition()
                                            throws ServletException,
                                                   java.io.IOException

Returns the render condition of the current resource. This method is an overload of getRenderCondition(Resource) using the current resource. The render condition is specified by granite:rendercondition or rendercondition subresource. Contrast this with getRenderCondition(Resource, boolean), where only granite:rendercondition is checked. This method is meant for backward compatibility; otherwise it is better to use getRenderCondition(Resource, boolean) for performance. Once the transition is over, this method will have the same behaviour as getRenderCondition(Resource, boolean) with cache = false.

Returns:

the render condition of the current resource

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error

getRenderCondition

@Nonnull
public RenderCondition getRenderCondition(@Nonnull
                                                   Resource resource)
                                            throws ServletException,
                                                   java.io.IOException

Returns the render condition of the given resource. The render condition is specified by granite:rendercondition or rendercondition subresource. Contrast this with getRenderCondition(Resource, boolean), where only granite:rendercondition is checked. This method is meant for backward compatibility; otherwise it is better to use getRenderCondition(Resource, boolean) for performance. Once the transition is over, this method will have the same behaviour as getRenderCondition(Resource, boolean) with cache = false.

Parameters:

resource - the resource

Returns:

the render condition of the given resource

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error

getRenderCondition

@Nonnull
public RenderCondition getRenderCondition(@Nonnull
                                                   Resource resource,
                                                   boolean cache)
                                            throws ServletException,
                                                   java.io.IOException

Returns the render condition of the given resource. The render condition is specified by granite:rendercondition subresource, unlike getRenderCondition(Resource).

Parameters:

resource - The resource

cache - true to cache the result; Use it when checking render condition of other resource (typically the item resource) so that the render condition is only resolved once.

Returns:

The render condition of the given resource; never null.

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error

getIconClass

public java.lang.String getIconClass(@CheckForNull
                                     java.lang.String icon)

Returns the icon class(es) for the given icon string from the content property.

Parameters:

icon - the icon string

Returns:

the icon class(es) for the given icon string from the content property, or null if the given icon is null

include

public void include(@Nonnull
                    Resource resource,
                    @Nonnull
                    Tag tag)
             throws ServletException,
                    java.io.IOException

Includes the given resource and passes the given tag to its renderer. This method performs similarly to <sling:include resource="" />.

Parameters:

resource - the resource to include

tag - the tag

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error

include

public void include(@Nonnull
                    Resource resource,
                    @Nonnull
                    ComponentHelper.Options options)
             throws ServletException,
                    java.io.IOException

Includes the given resource and passes the given options to its renderer. This method performs similarly to <sling:include resource="" />.

Parameters:

resource - the resource to include

options - the options

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error

include

public void include(@Nonnull
                    Resource resource,
                    @CheckForNull
                    java.lang.String resourceType,
                    @Nonnull
                    Tag tag)
             throws ServletException,
                    java.io.IOException

Includes the given resource with the given resourceType and passes the given tag to its renderer. This method performs similarly to <sling:include resource="" resourceType="" />.

Parameters:

resource - the resource to include

resourceType - the resource type

tag - the tag

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error

include

public void include(@Nonnull
                    Resource resource,
                    @CheckForNull
                    java.lang.String resourceType,
                    @Nonnull
                    ComponentHelper.Options options)
             throws ServletException,
                    java.io.IOException

Includes the given resource with the given resourceType and passes the given options to its renderer. This method performs similarly to <sling:include resource="" resourceType="" />.

Parameters:

resource - the resource to include

resourceType - the resource type

options - the options

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error

include

public void include(@Nonnull
                    Resource resource,
                    @CheckForNull
                    java.lang.String resourceType,
                    @CheckForNull
                    java.lang.String selectors,
                    @Nonnull
                    ComponentHelper.Options options)
             throws ServletException,
                    java.io.IOException

Includes the given resource with the given resourceType and passes the given options to its renderer. This method performs similarly to <sling:include resource="" replaceSelectors="" resourceType="" />.

Parameters:

resource - the resource to include

resourceType - the resource type

selectors - the selectors to be included as part of the request.

options - the options

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error

includeForLayout

public void includeForLayout(@Nonnull
                             Resource resource,
                             @Nonnull
                             ComponentHelper.Options options)
                      throws ServletException,
                             java.io.IOException

A convenient overload to includeForLayout(Resource, Resource, Options), with layoutResource as null.

Parameters:

resource - the resource to include

options - the options

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error

includeForLayout

public void includeForLayout(@Nonnull
                             Resource resource,
                             @CheckForNull
                             Resource layoutResource,
                             @Nonnull
                             ComponentHelper.Options options)
                      throws ServletException,
                             java.io.IOException

Includes the given resource to be rendered by the given layoutResource. This method is used by a component to delegate the rendering process to a layout.

If layoutResource is not null, the ComponentHelper.Options.layoutResource(Resource) is set.

This method will attempt to derive the resourceType to be passed to include(Resource, String, Options) based the following priorities:

1. layoutResource is not null, the resourceType is layoutResource's RT
2. layoutResource is null, the resourceType is Config.LAYOUT child node's RT
3. the resourceType is default layout as a catch-all fallback

Parameters:

resource - the resource to include

layoutResource - the layout resource to render the given resource with

options - the options

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error

call

public void call(@Nonnull
                 java.lang.String script,
                 @Nonnull
                 ComponentHelper.Options options)
          throws ServletException,
                 java.io.IOException

Calls the given script and passes the given options to its renderer. This method performs similarly to <sling:call script="" />.

Parameters:

script - the script to be called

options - the options

Throws:

ServletException - in case there's a servlet error

java.io.IOException - in case there's an i/o error