org.apache.cocoon.selection

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Java Source Code / Java Documentation » Web Framework » cocoon » org.apache.cocoon.selection 
org.apache.cocoon.selection
Java Source File NameTypeComment
AbstractRegexpSelector.javaClass

The AbstractRegexpSelector abstract class defines a simple selector operating over configured regular-expression patterns.

Configuration of an AbstractRegexpSelector is quite simple: first of all the patterns used for selections must be configured:

 <map:components>
 ...
AbstractSwitchSelector.javaClass Abstract SwitchSelector class.
BrowserSelector.javaClass Tests a specific browser pattern against the requesting user-agent.
BrowserSelectorTestCase.javaClass
CookieSelector.javaClass A Selector that matches a string against a configurable cookie's value.
CookieSelectorTestCase.javaClass
ExceptionSelector.javaClass In a <map:handle-errors>, selects depending on the exception that caused the error. The configuration of this selector allows to map exception class names to symbolic names that are used in the <map:when> alternatives.

Example configuration :

 <map:selector type="error" src="....ExceptionSelector">
 <exception class="org.xml.sax.SAXException" name="sax" unroll="true"/>
 <exception name="not-found" class="org.apache.cocoon.ResourceNotFoundException"/>
 <exception class="org.apache.cocoon.ProcessingException" unroll="true"/>
 <exception name="denied" class="java.security.SecurityException"/>
 <exception name="denied" class="my.comp.auth.AuthenticationFailure"/>
 </map:selector>
 
This example shows several features :
  • the "class" is the class name of the exception (which can be any Throwable),
  • an exception can be given a name, which is used in the <map:when> tests,
  • an exception can be unrolled, meaning we try to get its cause and then consider this cause for the exception name
  • Note that both "name" and "unroll" can be specified.
    ExceptionSelectorTestCase.javaClass
    HeaderSelector.javaClass A Selector that matches a string against a configurable request header, e.g.
    HeaderSelectorTestCase.javaClass
    HostSelector.javaClass A Selector that matches a string from within the host parameter of the HTTP request.
    HostSelectorTestCase.javaClass
    NamedPatternsSelector.javaClass Abstract class for selectors that select a value when it matches some patterns associated to the select expression.
    ParameterSelector.javaClass A Selector that matches a string in the parameters object passed to it.
    ParameterSelectorTestCase.javaClass
    RegexpHeaderSelector.javaClass

    The RegexpHeaderSelector class defines a selector matching specific headers to configured regular-expression patterns.

    The configuration of an RegexpHeaderSelector follows exactly what has been outlined in AbstractRegexpSelector regarding regular expression patterns, and additionally it requires an extra configuration element specifying the header whose value needs to be matched:

     <map:components>
     ...
    RegexpHeaderSelectorTestCase.javaClass Test case for RegexpHeaderSelector.
    RegexpRequestParameterSelector.javaClass

    The RegexpRequestParameterSelector class defines a selector matching specific request parameters to configured regular-expression patterns.

    The configuration of an RegexpRequestParameterSelector follows exactly what has been outlined in AbstractRegexpSelector regarting regular expression patterns, and additionally it requires an extra configuration element specifying the request parameter whose value needs to be matched:

     <map:components>
     ...
    RegexpRequestParameterSelectorTestCase.javaClass
    RequestAttributeSelector.javaClass A Selector that matches a string against a configurable request attribute's string represenation.
    RequestAttributeSelectorTestCase.javaClass
    RequestMethodSelector.javaClass A Selector that matches a getMethod() of the HTTP request.
    RequestMethodSelectorTestCase.javaClass
    RequestParameterSelector.javaClass A Selector that matches a string against a configurable request parameter's value.
    RequestParameterSelectorTestCase.javaClass
    ResourceExistsSelector.javaClass Selects the first of a set of Resources (usually files) that exists.

    A parameter 'prefix',

     <map:parameter src="prefix" value="some/path"/<
     
    may be supplied to the selector instance.
    ResourceExistsSelectorTestCase.javaClass
    Selector.javaInterface
    SessionAttributeSelector.javaClass A Selector that matches a string against a configurable session attribute's string represenation.
    SessionAttributeSelectorTestCase.javaClass
    SimpleSelector.javaClass A very simple selector that operates on string literals, useful especially in conjunction with input modules.
    SimpleSelectorTestCase.javaClass
    SwitchSelector.javaInterface SwitchSelector is an enhanced Selector interface that allows a context object to be created to optimize selector conditional testing.

    The original Selector interface supports an if-then-else style of conditional testing depending on whether a particular expression is true. This causes Selector.select() to be invoked for each <map:when> statement which may be undesirable due to performance or logic reasons.

     Example, the following sitemap snippet:
     <map:select type="aSelector">
     <map:when test="test-expr1">...</map:when>
     <map:when test="test-expr2">...</map:when>
     </map:select>
     is interpreted as (pseudo-code):
     if (aSelector.select("test-expr1", objectModel, params)) {
     ...
     } else if (aSelector.select("test-expr2", objectModel, params)) {
     ...
     }
     ie.
    XPathExceptionSelector.javaClass Additional to the inherited functionality from its superclass ExceptionSelector, this selector allows to define xpath expressions to evaluate supplemental information given in the thrown exception.
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