Package org.apache.tapestry5.http
Interface Link
- All Known Implementing Classes:
LinkImpl
public interface Link
A link is the Tapestry representation of a URL or URI that triggers dynamic behavior. This link is in three parts: a
path portion, an optional anchor, and a set of query parameters. A request for a link will ultimately be recognized
by a
Dispatcher
.
Query parameter values are kept separate from the path portion to support encoding those values into hidden form
fields (where appropriate).-
Method Summary
Modifier and TypeMethodDescriptionaddParameter
(String parameterName, String value) Adds a parameter value.addParameterValue
(String parameterName, Object value) Adds a parameter value as a value object; the value object is converted to a string via ContextPathEncoder.encodeValue(Object) from tapestry-core and the result is added viaaddParameter(String, String)
.copyWithBasePath
(String basePath) Creates a copy of this link that has the same parameters, anchor, and other attributes, but a different base path.Returns the link anchor.Returns the completely unadorned base path.Returns the names of any additional query parameters for the URI.getParameterValue
(String name) Returns the value of a specifically named query parameter, ornull
if no such query parameter is stored in the link.String[]
getParameterValues
(String parameterName) Returns the parameter values for the given name.Returns the current security for this link, which reflects whether the targeted page is itself secure or insecure.removeParameter
(String parameterName) Removes a parameter value, which is occasionally useful when transforming a parameter into a portion of the path.Sets the link anchor.void
setSecurity
(LinkSecurity newSecurity) Changes the link's security, which can be useful to force a link to be either secure or insecure when normally it might not be.Returns the absolute URL, which includes the scheme, hostname and possibly port (as perBaseURLSource.getBaseURL(boolean)
).toAbsoluteURI
(boolean secure) Returns either the secure or insecure URL, with complete scheme, hostname and possibly port (as perBaseURLSource.getBaseURL(boolean)
).Returns the link as a redirect URI.toURI()
Returns the URI portion of the link.
-
Method Details
-
getParameterNames
Returns the names of any additional query parameters for the URI. Query parameters store less regular or less often used values that can not be expressed in the path. They also are used to store, or link to, persistent state.- Returns:
- list of query parameter names, is alphabetical order
-
getParameterValue
Returns the value of a specifically named query parameter, ornull
if no such query parameter is stored in the link. Use this method only when you are sure the parameter has only one value. If the parameter might have more than one value, usegetParameterValues(java.lang.String)
. If you use this method with a multivalued parameter, the value returned is equal to the first value in the array returned bygetParameterValues
.- Returns:
- a string representing the single value of the named parameter
-
addParameter
@IncompatibleChange(release="5.4", details="changed from void to Link") Link addParameter(String parameterName, String value) Adds a parameter value. The value will be added, as is, to the URL. In many cases, the value should be URL encoded viaURLCodec
.- Parameters:
parameterName
- the name of the parameter to storevalue
- the value to store, a null or blank value is allowed (as of Tapestry 5.3)- Returns:
- this Link, to support method chaining
-
addParameterValue
Adds a parameter value as a value object; the value object is converted to a string via ContextPathEncoder.encodeValue(Object) from tapestry-core and the result is added viaaddParameter(String, String)
. The Link object is returned for further configuration.- Since:
- 5.2.2
-
removeParameter
@IncompatibleChange(release="5.4", details="changed from void to Link") Link removeParameter(String parameterName) Removes a parameter value, which is occasionally useful when transforming a parameter into a portion of the path.- Returns:
- this Link, to support method chaining
- Since:
- 5.2.0
-
getBasePath
Returns the completely unadorned base path. Other methods (such astoURI()
), may append an anchor or query parameters.- Since:
- 5.2.0
-
copyWithBasePath
Creates a copy of this link that has the same parameters, anchor, and other attributes, but a different base path.- Returns:
- a new Link instance
- Since:
- 5.2.0
-
toURI
Returns the URI portion of the link. When the link is created for a form, this will not include query parameters. This is the same value returned from toString().- Returns:
- the URI, ready to be added as an element attribute
-
toRedirectURI
Returns the link as a redirect URI. The URI includes any query parameters. -
getAnchor
Returns the link anchor. If this link does not have an anchor, this method returnsnull
.- Returns:
- the link anchor
-
setAnchor
@IncompatibleChange(release="5.4", details="changed from void to Link") Link setAnchor(String anchor) Sets the link anchor. Null and empty anchors will be ignored when building the link URI.- Parameters:
anchor
- the link anchor- Returns:
- this Link, to support method chaining
-
toAbsoluteURI
Returns the absolute URL, which includes the scheme, hostname and possibly port (as perBaseURLSource.getBaseURL(boolean)
). By default, the scheme is chosen to match the security of the current request. Note: the semantics of this method changed between Tapestry 5.1 and 5.2. Most code should use toString() ortoURI()
(which are equivalent) instead.- Returns:
- the complete, qualified URL, including query parameters.
-
toAbsoluteURI
Returns either the secure or insecure URL, with complete scheme, hostname and possibly port (as perBaseURLSource.getBaseURL(boolean)
).- Returns:
- the complete, qualified URL, including query parameters.
- Since:
- 5.2.2
-
setSecurity
@IncompatibleChange(release="5.4", details="LinkSecurity class moved from internal package to org.apache.tapestry5.") void setSecurity(LinkSecurity newSecurity) Changes the link's security, which can be useful to force a link to be either secure or insecure when normally it might not be.- Parameters:
newSecurity
- new security value, not null, typicallyLinkSecurity.FORCE_SECURE
orLinkSecurity.FORCE_INSECURE
- Since:
- 5.3
-
getSecurity
@IncompatibleChange(release="5.4", details="LinkSecurity class moved from internal package to org.apache.tapestry5.") LinkSecurity getSecurity()Returns the current security for this link, which reflects whether the targeted page is itself secure or insecure.- Since:
- 5.3
-
getParameterValues
Returns the parameter values for the given name. Returns null if no such parameter is stored in the link.
-