org.springframework.web.util

Class TagUtils

java.lang.Object

org.springframework.web.util.TagUtils

public abstract class TagUtils
extends Object

Utility class for tag library related code, exposing functionality such as translating Strings to web scopes.

• page will be transformed to PageContext.PAGE_SCOPE
• request will be transformed to PageContext.REQUEST_SCOPE
• session will be transformed to PageContext.SESSION_SCOPE
• application will be transformed to PageContext.APPLICATION_SCOPE

Author:

Alef Arendsen, Rob Harrop, Juergen Hoeller, Rick Evans

Field Summary

Fields

Modifier and Type	Field and Description
static String	SCOPE_APPLICATION Constant identifying the application scope.
static String	SCOPE_PAGE Constant identifying the page scope.
static String	SCOPE_REQUEST Constant identifying the request scope.
static String	SCOPE_SESSION Constant identifying the session scope.

Constructor Summary

Constructors

Constructor and Description
TagUtils()

Method Summary

Modifier and Type	Method and Description
static void	assertHasAncestorOfType(Tag tag, Class<?> ancestorTagClass, String tagName, String ancestorTagName) Determine whether the supplied Tag has any ancestor tag of the supplied type, throwing an IllegalStateException if not.
static int	getScope(String scope) Determines the scope for a given input String.
static boolean	hasAncestorOfType(Tag tag, Class<?> ancestorTagClass) Determine whether the supplied Tag has any ancestor tag of the supplied type.

Methods inherited from class java.lang.Object

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

Field Detail

SCOPE_PAGE

public static final String SCOPE_PAGE

Constant identifying the page scope.

See Also:

Constant Field Values

SCOPE_REQUEST

public static final String SCOPE_REQUEST

Constant identifying the request scope.

See Also:

Constant Field Values

SCOPE_SESSION

public static final String SCOPE_SESSION

Constant identifying the session scope.

See Also:

Constant Field Values

SCOPE_APPLICATION

public static final String SCOPE_APPLICATION

Constant identifying the application scope.

See Also:

Constant Field Values

Constructor Detail

TagUtils

public TagUtils()

Method Detail

getScope

public static int getScope(String scope)

Determines the scope for a given input String.

If the String does not match 'request', 'session', 'page' or 'application', the method will return PageContext.PAGE_SCOPE.

Parameters:

scope - the String to inspect

Returns:

the scope found, or PageContext.PAGE_SCOPE if no scope matched

Throws:

IllegalArgumentException - if the supplied scope is null

hasAncestorOfType

public static boolean hasAncestorOfType(Tag tag,
                                        Class<?> ancestorTagClass)

Determine whether the supplied Tag has any ancestor tag of the supplied type.

Parameters:

tag - the tag whose ancestors are to be checked

ancestorTagClass - the ancestor Class being searched for

Returns:

true if the supplied Tag has any ancestor tag of the supplied type

Throws:

IllegalArgumentException - if either of the supplied arguments is null; or if the supplied ancestorTagClass is not type-assignable to the Tag class

assertHasAncestorOfType

public static void assertHasAncestorOfType(Tag tag,
                                           Class<?> ancestorTagClass,
                                           String tagName,
                                           String ancestorTagName)

Determine whether the supplied Tag has any ancestor tag of the supplied type, throwing an IllegalStateException if not.

Parameters:

tag - the tag whose ancestors are to be checked

ancestorTagClass - the ancestor Class being searched for

tagName - the name of the tag; for example 'option'

ancestorTagName - the name of the ancestor tag; for example 'select'

Throws:

IllegalStateException - if the supplied tag does not have a tag of the supplied parentTagClass as an ancestor

IllegalArgumentException - if any of the supplied arguments is null, or in the case of the String-typed arguments, is composed wholly of whitespace; or if the supplied ancestorTagClass is not type-assignable to the Tag class

See Also:

hasAncestorOfType(javax.servlet.jsp.tagext.Tag, Class)