HeaderPhaseSupportConstants (Jetspeed-2 Core API 2.3.1 API)

```
public interface HeaderPhaseSupportConstants
```
This interface defines some constants for attribute name or value of contributed head elements. This constant values are used by Jetspeed portal to optimize the head elements aggregation.
Jetspeed can look up 'id' attribute value not to include redundant head element. Also, Jetspeed can look up 'org.apache.portals.portal.page.head.element.contribution.merge.hint' attribute value to merge all the text content of elements containing 'org.apache.portals.portal.page.head.element.contribution.merge.hint' attribute with same value.

For example, if the following elements are contributed by a portlet,
and, if the following elements are contributed by another portlet, then, the result aggregated elements are to be like the following:

Version:

$Id: HeaderPhaseSupportConstants.java 881415 2009-11-17 18:07:00Z woonsan $

Field Summary

Fields
Modifier and Type	Field and Description
`static Set<String>`	`CONTAINER_HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_SET` ID attribute values set for script libraries included by the container.
`static String`	`HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_DOJO_LIBRARY_INCLUDE` An ID attribute value for dojo library inclusion which can be used in head elements merging by portal.
`static String`	`HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_YUI_LIBRARY_INCLUDE` An ID attribute value for YUI library inclusion which can be used in head elements merging by portal.
`static String`	`HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_ATTRIBUTE` An attribute name of head element contributed to the portal page aggregation by a portlet.
`static String`	`HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_KEY_DOJO_CONFIG` An attribute value for key hint to aggregate dojo configuration which can be used in head elements merging by portal.
`static String`	`HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_KEY_DOJO_REQUIRES` An attribute value for key hint to aggregate dojo require statements which can be used in head elements merging by portal.

- Field Detail
  - HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_DOJO_LIBRARY_INCLUDE
```
static final String HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_DOJO_LIBRARY_INCLUDE
```
    An ID attribute value for dojo library inclusion which can be used in head elements merging by portal.
    
    See Also:
    Constant Field Values
  - HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_YUI_LIBRARY_INCLUDE
```
static final String HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_YUI_LIBRARY_INCLUDE
```
    An ID attribute value for YUI library inclusion which can be used in head elements merging by portal.
    
    See Also:
    Constant Field Values
  - CONTAINER_HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_SET
```
static final Set<String> CONTAINER_HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_SET
```
    ID attribute values set for script libraries included by the container.
  - HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_ATTRIBUTE
```
static final String HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_ATTRIBUTE
```
    An attribute name of head element contributed to the portal page aggregation by a portlet. The value of this attribute can be used by portal to merge contents of each contributed head element into centralized element(s).
    For example, if a contributed head element has an attribute value, 'dojo.require', with text content, 'dojo.lang.*' and another contributed element has the same attribute value, 'dojo.require', with text content, 'dojo.event.*', then a portal can merge those contents into a single script element for optimization.
    
    See Also:
    Constant Field Values
  - HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_KEY_DOJO_CONFIG
```
static final String HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_KEY_DOJO_CONFIG
```
    An attribute value for key hint to aggregate dojo configuration which can be used in head elements merging by portal.
    
    See Also:
    Constant Field Values
  - HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_KEY_DOJO_REQUIRES
```
static final String HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_KEY_DOJO_REQUIRES
```
    An attribute value for key hint to aggregate dojo require statements which can be used in head elements merging by portal.
    
    See Also:
    Constant Field Values

Interface HeaderPhaseSupportConstants

Field Summary

Field Detail

HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_DOJO_LIBRARY_INCLUDE

HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_YUI_LIBRARY_INCLUDE

CONTAINER_HEAD_ELEMENT_CONTRIBUTION_ELEMENT_ID_SET

HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_ATTRIBUTE

HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_KEY_DOJO_CONFIG

HEAD_ELEMENT_CONTRIBUTION_MERGE_HINT_KEY_DOJO_REQUIRES