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## com.bea.netuix.servlets.controls
Class PresentationContext

    java.lang.Object
      com.bea.netuix.servlets.controls.ControlContext
          com.bea.netuix.servlets.controls.PresentationContext

All Implemented Interfaces:
  Serializable

Direct Known Subclasses:
  AbstractButtonPresentationContext, BodyPresentationContext, DesktopPresentationContext, FooterPresentationContext, HeaderPresentationContext, HeadPresentationContext, LayoutPresentationContext, MenuPresentationContext, PlaceholderPresentationContext, ShellPresentationContext, ThemePresentationContext, TitlebarPresentationContext, WindowPresentationContext

public abstract class PresentationContext
extends com.bea.netuix.servlets.controls.ControlContext

The portal framework provides instances of subclasses of `PresentationContext` during portal rendering, actions, and in backing files. `PresentationContext` subclasses are used to represent portal framework components during the portal's rendering phase and are almost exclusively read only (the exception being the `setVisible` method to allow fine-grained rendering of components in skeleton files). `PresentationContext` subclasses are primarily targetted for use by skeleton JSPs in portal look and feel implementations.

See Also:
  Serialized Form

Field Summary

Fields inherited from class com.bea.netuix.servlets.controls.ControlContext
`debug`

Method Summary
`List` | `getChildren()` Returns a list of `PresentationContext` children of this context, if any.
`List` | `getChildren(String tagName)` Returns a list of `PresentationContext` children of this context, if any, narrowed by by the specified tag name.
`PresentationContext` | `getFirstChild(String tagName)` Given a tag name, return an instance of the component's `PresentationContext` subclass, if it exists as a child.
`Properties` | `getParsedProperties()` Get the extra properties of the component, if they exist.
`String` | `getPresentationClass()` Get the presentation class of the component, if it exists.
`String` | `getPresentationId()` Get the presentation id of the component, if it exists.
`String` | `getPresentationStyle()` Get the presentation style of the component, if it exists.
`String` | `getProperties()` Get the extra properties string of the component, if it exists.
`String` | `getProperty(String key)` Get a property of the underlying component.
`String` | `getProperty(String key, String defaultValue)` Get a property of the underlying component, using the specified default if none exists.
`boolean` | `getPropertyAsBoolean(String key, boolean defaultValue)` Get a property of the underlying component, using the specified default if none exists.
`int` | `getPropertyAsInt(String key, int defaultValue)` Get a property of the underlying component, using the specified default if none exists.
`Locale` | `getResolvedLocale()` Returns the Locale associated with the best matching portal component resource based on user request locale preferrences.
`String` | `getTagName()` Get the tag name of the component this context represents.
`boolean` | `isVisible()` Tests whether or not the component represented by this context is visible, and therefore whether or not it should be rendered.
`void` | `setVisible(boolean visible)` Set the visiblity state of the component.

Methods inherited from class com.bea.netuix.servlets.controls.ControlContext
`getContextFromRequest, getContextFromRequest, getContextKey, getControl, getRequestKey, getUniqueId, removeContextFromRequest, setContextInRequest`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### getChildren

    public List getChildren()

  Returns a list of `PresentationContext` children of this context, if any. If no children exist, an empty list is returned. Elements of the list are all descendents of the type `PresentationContext`. The returned list is for immediate children only -- there is no recursion into childrens' children.

  Note, this list is modifiable! Avoid mutating the list (or at least use caution if you do).

  Returns:
    The list of all immediate children or an empty list if none exist

### getChildren

    public List getChildren(String tagName)

  Returns a list of `PresentationContext` children of this context, if any, narrowed by by the specified tag name. If no children exist for that tag name, an empty list is returned. Elements of the list are all descendents of the type `PresentationContext`. The returned list is for immediate children only -- there is no recursion into childrens' children. This list is unmodifiable.

  Parameters:
    `tagName` - The namespace-qualified tag name `namespace:tagname`
  Returns:
    The list of all immediate children with the given tag name

### getFirstChild

    public PresentationContext getFirstChild(String tagName)

  Given a tag name, return an instance of the component's `PresentationContext` subclass, if it exists as a child. The first child matching the specified tag name is returned.

  Parameters:
    `tagName` - The namespace-qualified tag name `namespace:tagname`
  Returns:
    The component's context if the control exists, otherwise null

### getParsedProperties

    public Properties getParsedProperties()

  Get the extra properties of the component, if they exist. This value will not be null. The `Properties` class returned by this method is the parsed view of those from `getProperties()`.

  Returns:
    The control's extra properties, if set; an empty Properties instance if not
  See Also:
    `getProperties()`

### getPresentationClass

    public String getPresentationClass()

  Get the presentation class of the component, if it exists. This value may be null. The presentation id is typically mapped to an id attribute when rendering HTML-type output.

  Returns:
    The control's presentation class, if set

### getPresentationId

    public String getPresentationId()

  Get the presentation id of the component, if it exists. This value may be null. The presentation id is typically mapped to an id attribute when rendering HTML-type output.

  Returns:
    The control's presentation id, if set

### getPresentationStyle

    public String getPresentationStyle()

  Get the presentation style of the component, if it exists. This value may be null. The presentation id is typically mapped to an id attribute when rendering HTML-type output.

  Returns:
    The control's presentation style, if set

### getProperties

    public String getProperties()

  Get the extra properties string of the component, if it exists. This value may be null. Properties are formatted as in the following example:

            my-first-key: my-first-value; my-second-key: my-second-value;

  Any number of properties may be in a properties string.

  Returns:
    The control's extra properties, if set
  See Also:
    `getParsedProperties()`

### getProperty

    public String getProperty(String key)

  Get a property of the underlying component. This is a convenience method. The `key` argument should not be null.

  Parameters:
    `key` - The property key
  Returns:
    The value associated with the specified key, if it exists

### getProperty

    public String getProperty(String key,
                              String defaultValue)

  Get a property of the underlying component, using the specified default if none exists. This is a convenience method. The `key` argument should not be null.

  Parameters:
    `key` - The property key
    `defaultValue` - The value to use if no value is found for the specified key
  Returns:
    The value associated with the specified key, if it exists, or the default

### getPropertyAsBoolean

    public boolean getPropertyAsBoolean(String key,
                                        boolean defaultValue)

  Get a property of the underlying component, using the specified default if none exists. The `key` argument should not be null. This is a convenience method that attempts a conversion of the value from a `String` to a boolean. Failure during conversion causes a value of `false` to be returned. The default value is used if the key lookup in the properties instance returned `null` or if the key itself was null.

  Parameters:
    `key` - The property key
    `defaultValue` - The value to use if no value is found for the specified key
  Returns:
    The value associated with the specified key, if it exists, or the default

### getPropertyAsInt

    public int getPropertyAsInt(String key,
                                int defaultValue)

  Get a property of the underlying component, using the specified default if none exists. The `key` argument should not be null. This is a convenience method that attempts a conversion of the value from a `String` to an int. Failure during conversion or the key being null causes the default value to be returned.

  Parameters:
    `key` - The property key
    `defaultValue` - The value to use if no value is found for the specified key
  Returns:
    The value associated with the specified key, if it exists, or the default

### getResolvedLocale

    public Locale getResolvedLocale()

  Returns the Locale associated with the best matching portal component resource based on user request locale preferrences. If no information is available about the matching Locale, the default locale as specified in netuix-config.xml is returned. This method is most useful for portlets and JSPs included by portlets.

  Note that in streaming mode, the resolved locale for a portlet is always the default locale, since the portlet is disassembled from the default locale portal and inlined for requests.

### getTagName

    public String getTagName()

  Get the tag name of the component this context represents. The tag name is a short name used to identify the component of the form `namespace:tagname`, where the namespace corresponds to the parent package in which the context is defined (e.g. a book's full tag name would be `page:book`).

  Returns:
    The tag name of the component this context represents; this should never be null
  See Also:
    `#getChildren`

### isVisible

    public boolean isVisible()

  Tests whether or not the component represented by this context is visible, and therefore whether or not it should be rendered. Typically, this is only important to the renderer and not the skeletons using this context.

  Returns:
    The true if visible

### setVisible

    public void setVisible(boolean visible)

  Set the visiblity state of the component. Setting the state to `false` will cause the `beginRender` and `endRender` methods to not be called during the render lifecycle stage.

  Parameters:
    `visible` - The `boolean` value to set the visibility state

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Copyright © 2004 BEA Systems, Inc. All Rights Reserved