Class SetTemplate
- java.lang.Object
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- sunlabs.brazil.template.Template
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- sunlabs.brazil.template.SetTemplate
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- All Implemented Interfaces:
java.io.Serializable
,Handler
,TemplateInterface
- Direct Known Subclasses:
MultipartSetTemplate
public class SetTemplate extends Template implements java.io.Serializable, Handler
Template (and handler) class for setting and getting values to and from the current (or other) request context. This class is used by the TemplateHandler. The following tags are processed by this class:- <set name=.. [value=..] [namespace=..]>
- <get name=.. [default=..] [namespace=..] [max=nnn] [convert=html|url|none] [set=..]>
- <namespace name=.. [clear] [remove] [store=xxx] [load=xxx]>
- <import namespace=.. />
- <unimport namespace=.. />
- <tag [name=..]>
- </tag>
The tag
<set>
is processed with the following attributes:- name=value
- The name of the entry to set in the request properties.
- value=value
- The value to store in the property. If this option is not specified, then the existing value for this property will be removed.
- default=other
- If
default
is specified and the specified value was the empty string "", then store this other value in the property instead. other is only evaluated in this case. - local
- By default, variables are set (or removed from) a namespace that is
persistent across all requests for the same session. If
local
is specified, the values only remain for the duration of the current request. [Deprecated - use namespace=local] - namespace
- The namespace to use to set or delete the property. The default
is
namespace=${SessionID}
, unlessset
is inside the scope of an enclosingnamespace
tag. Namespaces are used to define variable scopes that may be managed explicitly in template pages.Two namespaces are treated specially:
- local
may be used to set (or clear) values fromrequest.props
. - server
may be used to set (or clear) values fromserver.props
, unless "noserver" is defined in which case hte "Server" namespace is not treated specially.
- local
The
<namespace>
..</namespace>
tag pairs are used to specify a default namespace other than theSessionId
for the set and import tags or manipulate a namespace. When a namespace is in effect, the request property [prefix].namespace is set to the current namespace, where [prefix] is the RewriteContext.templatePrefix. This permits other templates (such as the ListTemplate) to use the current namespace setting. These tags don't nest.attributes for
namespace
:- name=value
- The default namespace to use for the set and
import
default namespace name. - clear
- If set, namespace
name
is cleared. - remove
- If set, namespace
name
is removed. - load=file_name
- If specified, and the property
saveOk
is set, then the specified namespace will be saved loaded from a file in java properties format. Relative path names are resolved with respect to the document root. - store=file_name
- If specified, and the property
saveOk
is set, then the specified namespace will be stored to a file in java properties format. Relative path names are resolved with respect to the document root.
load
orstore
, the namespace names "local" and "server" are treated specially, referring to "request.props" and "server.props" respectively.The tag
<import>
(and<unimport>
) are processed with the following attributes:- namespace=value
- The name/value pairs assiciated with the namespace are made available for the remainder of the page.
The "unimport" taq should probably be replaced by <import>
The "get" (formerly property) tag has the following attributes:
- name
- The name of the variable to get
- namespace
- The namespace to look in. By default, the variable is searched for in "request.props"
- default
- The value to use if no value matches "name".
- convert
- The conversion to perform on the value of the data before substitution: "html", "url", "lower, "trim", or "none" (the default). For "html", any special html syntax is escaped. For "url", the data will be suitable for transmission as an http URL. The "lower" and "trim" options convert to lowercase and remove leading and trailing whitespace, respectively.
- max
- The output is truncated to at most
max
characters.
<get foo>
is equivalent to:<get name="foo">
.Request Properties:
- sessionTable
- The name of the SessionManager table to use for storing values. Defaults to the template handler's prefix. When configured in one server both as a handler and a template, the sessionTable should be set to the same value in both cases to get a useful result.
- debug
- If set, the original tag is included in a comment, otherwise it is removed entirely.
- mustMatch
- Set to a glob pattern that all names must match in order to be set. This may be used to prevent malicious html pages (what a concept) from changing inappropriate values.
- noserver
- The "server" namespace will no longer be mapped to
server.props
- noSet
- If set, then the "set" tag will be disabled.
- querySet
- If set, then properties may be set in query parameters, to the "handler" portion, but only if they match the glob pattern.
- autoImport
- If set to "1", the namespace for the session is automatically imported. (defaults to "1");
- imports
- Defines a set of (white space delimited) namespaces that will automatically be imported at the beginning of each page. Each namespace name will be processed for ${...} substitutions before an import is attempted. If the namespace doesn't already exist, the import is ignored.
- query
- The query parameters are inserted into the request object, prefixed by the value assigned to "query".
- headers
- The mime headers are inserted into the request object,
prefixed by the value assigned to "headers".
In addition, the following properties (prefixed with "headers") are also set:
- address The ip address of the client
- counter A monotonically increasing counter (# of client requests accepted since the server started).
- method The request method (typically GET or POST).
- protocol The client HTTP protocol level (for 1.0 or 1.1)
- query The current query data, if any.
- timestamp A timestamp (in ms since epoch) from when this request was first accepted.
- url The current url.
- hostname, hostport The name and port parts of the "host" header, if set.
- url.orig
- If set and "headers" are requested, this value is used as
the
url
instead of the one in request.url.
Normally, any persistent properties held by the SetTemplate are chained onto the request.props when the init method is found. If this template is installed as an up-stream handler, then the persistent properties associated with the session are made available at that time.
When used as a handler, the following property is used:
- session=value
- The request property to find the session information in. Normally this should be the same as the session property used by the container calling this as a template.
- saveOk
- This must be specified in order for the "namespace store" or "namespace load" functions to operate.
- Version:
- Author:
- Stephen Uhler
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description SetTemplate()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
doImport(RewriteContext hr)
See if a remembered namespace is actually in use, and import it.java.io.File
file2path(java.util.Properties p, java.lang.String prefix, java.lang.String name)
Convert a file name into a file object.boolean
init(Server server, java.lang.String prefix)
Get the 2 SessionManager keys, "sessionTable" and "session" (SessionID).boolean
init(RewriteContext hr)
Chain the session-id properties into the request chain, if there are any.boolean
respond(Request request)
Chain a SessionManager entries onto the request properties, and optionally allow setting of request props from query parameters.void
tag_get(RewriteContext hr)
Replace the tag "get" with the value of the variable specified by the "name" attribute.void
tag_import(RewriteContext hr)
Import all the data from the named namespace.void
tag_namespace(RewriteContext hr)
Set the default namespace for "set" and "import".void
tag_property(RewriteContext hr)
Convert the html tag "property" in to the request's property DEPRECATED - use "get"void
tag_set(RewriteContext hr)
Set the value of a variable.void
tag_slash_namespace(RewriteContext hr)
Clear the default namespace for "set" and "import".void
tag_slash_tag(RewriteContext hr)
Insert a literal ">"void
tag_tag(RewriteContext hr)
Insert a literal "<".void
tag_unimport(RewriteContext hr)
Un-import a previously imported namespace.
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Method Detail
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init
public boolean init(RewriteContext hr)
Chain the session-id properties into the request chain, if there are any. If "query" or "headers" are requested for "get", then add in those properties to request.props.- Specified by:
init
in interfaceTemplateInterface
- Overrides:
init
in classTemplate
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tag_set
public void tag_set(RewriteContext hr)
Set the value of a variable. Allow variable substitutions in the name and value. Don't create property tables needlessly.Attributes:
- name
- The name of the variable to set
- value
- The value to set if to.
- namespace
- The namespace to look in. By default, the variable is set in the namespace associated with the current "SessionId".
- local
- A (deprecated) alias for "namespace=local", or the current request.props.
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tag_property
public void tag_property(RewriteContext hr)
Convert the html tag "property" in to the request's property DEPRECATED - use "get"
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tag_get
public void tag_get(RewriteContext hr)
Replace the tag "get" with the value of the variable specified by the "name" attribute.Attributes:
- name
- The name of the variable to get
- namespace
- The namespace to look in. By default, the variable is searched for in "request.props". The namespace "server" is used to look in the server's namespace. The namespace "local" is a synonym for the default namespace.
- default
- The value to use if no value matches "name".
- convert
- The conversion to perform on the value of the data before substitution: "html", "url", or "none" (the default). For "html", any special html syntax is escaped. For "url", the data will be suitable for transmission as an http URL.
- max
- Truncate the String to at most
max
characters. Max must be at least one, and truncation occurs after any conversions. - set
- The resultant value is placed into the request property named by
the
set
attribute, and not inserted into the HTML stream. If none of "namespace", "convert", or "match" is used, then this simply copies the property from one name to another.
<get foo>
is equivalent to:<get name="foo">
.
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tag_import
public void tag_import(RewriteContext hr)
Import all the data from the named namespace. The namespace associated with the session ID is imported automatically for backward compatibility. If the namespace doesn't exist, don't create it now, but remember it needs to be "Chained" if it is created on this page.
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tag_unimport
public void tag_unimport(RewriteContext hr)
Un-import a previously imported namespace.
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tag_namespace
public void tag_namespace(RewriteContext hr)
Set the default namespace for "set" and "import".
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file2path
public java.io.File file2path(java.util.Properties p, java.lang.String prefix, java.lang.String name)
Convert a file name into a file object. relative paths use are resolved relative to the document root- Parameters:
p
- properties file to find the doc root inprefix
- the properties prefix for rootname
- the name of the file
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tag_slash_namespace
public void tag_slash_namespace(RewriteContext hr)
Clear the default namespace for "set" and "import".
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tag_tag
public void tag_tag(RewriteContext hr)
Insert a literal "<". Using the current scheme, there is no easy way to substitute into a tag parameter. So we'll invent a "magic" tag (called tag) that will allow us to create entities dynamically. Thus values can be substituted into entities by escaping the entity as in:<tag>a href=<property href></tag>
The [optional] attribute "name" may be used to specify the name of the tag, which will be emmitted just after the "<".
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tag_slash_tag
public void tag_slash_tag(RewriteContext hr)
Insert a literal ">"
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init
public boolean init(Server server, java.lang.String prefix)
Get the 2 SessionManager keys, "sessionTable" and "session" (SessionID).- Specified by:
init
in interfaceHandler
- Parameters:
server
- The HTTP server that created thisHandler
. TypicalHandler
s will useServer.props
to obtain run-time configuration information.prefix
- The handlers name. The string thisHandler
may prepend to all of the keys that it uses to extract configuration information fromServer.props
. This is set (by theServer
andChainHandler
) to help avoid configuration parameter namespace collisions.- Returns:
true
if thisHandler
initialized successfully,false
otherwise. Iffalse
is returned, thisHandler
should not be used.
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respond
public boolean respond(Request request)
Chain a SessionManager entries onto the request properties, and optionally allow setting of request props from query parameters. Only the session id table can be chained, and values (if any) are set in request.props (i.e. namespace=local)
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doImport
public boolean doImport(RewriteContext hr)
See if a remembered namespace is actually in use, and import it. (This is a workaround). If some other template causes a namespace that was previously imported but empty to be created, then this tells us that it is now populated, and should be added to the chain. [a better implementation might have us register interest in a namespace, so we would be called automatically upon creation, instead of requiring the creator to know about us and make this call explicitly.]
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