org.apache.struts2.result

## Class StrutsResultSupport

- java.lang.Object
- - org.apache.struts2.result.StrutsResultSupport

- All Implemented Interfaces:
    Result, Serializable, StrutsStatics
  Direct Known Subclasses:
    FreemarkerResult, PlainTextResult, PostbackResult, ServletDispatcherResult, ServletRedirectResult, StreamResult, VelocityResult

      public abstract class StrutsResultSupport
      extends Object
      implements Result, StrutsStatics

  A base class for all Struts action execution results. The "location" param is the default parameter, meaning the most common usage of this result would be:

  This class provides two common parameters for any subclass:

  - location - the location to go to after execution (could be a jsp page or another action). It can be parsed as per the rules definied in the `translateVariables` method
  - parse - true by default. If set to false, the location param will not be parsed for expressions
  - encode - false by default. If set to false, the location param will not be url encoded. This only have effect when parse is true

  NOTE: The encode param will only have effect when parse is true

  In the struts.xml configuration file, these would be included as:

        <result name="success" type="redirect">
            <param name="location">foo.jsp</param>
        </result>

  or

        <result name="success" type="redirect" >
            <param name="location">foo.jsp?url=${myUrl}</param>
            <param name="parse">true</param>
            <param name="encode">true</param>
        </result>

  In the above case, myUrl will be parsed against Ognl Value Stack and then URL encoded.1

  or when using the default parameter feature

        <result name="success" type="redirect">foo.jsp</result>

  You should subclass this class if you're interested in adding more parameters or functionality to your Result. If you do subclass this class you will need to override `doExecute(String, ActionInvocation)`.

  Any custom result can be defined in struts.xml as:

        <result-types>
            ...
            <result-type name="myresult" class="com.foo.MyResult" />
        </result-types>

  Please see the `Result` class for more info on Results in general.

  See Also:
    `Result`, Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `DEFAULT_PARAM` The default parameter
    `static String` | `DEFAULT_URL_ENCODING` use UTF-8 as this is the recommended encoding by W3C to avoid incompatibilities.
    `protected boolean` | `parseLocation`

    - ### Fields inherited from interface org.apache.struts2.StrutsStatics

      `HTTP_REQUEST, HTTP_RESPONSE, PAGE_CONTEXT, SERVLET_CONTEXT, SERVLET_DISPATCHER, STRUTS_ACTION_TAG_INVOCATION, STRUTS_PORTLET_CONTEXT`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `StrutsResultSupport()`
    `StrutsResultSupport(String location)`
    `StrutsResultSupport(String location, boolean parse, boolean encode)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected String` | `conditionalParse(String param, ActionInvocation invocation)` Parses the parameter for OGNL expressions against the valuestack
    `protected Collection<String>` | `conditionalParseCollection(String param, ActionInvocation invocation, boolean excludeEmptyElements)` As `conditionalParse(String, ActionInvocation)` but does not convert found object into String.
    `protected abstract void` | `doExecute(String finalLocation, ActionInvocation invocation)` Executes the result given a final location (jsp page, action, etc) and the action invocation (the state in which the action was executed).
    `void` | `execute(ActionInvocation invocation)` Implementation of the `execute` method from the `Result` interface.
    `String` | `getLastFinalLocation()` Returns the last parsed and encoded location value
    `String` | `getLocation()` Gets the location it was created with, mainly for testing
    `void` | `setEncode(boolean encode)` Set encode to `true` to indicate that the location should be url encoded.
    `void` | `setLocation(String location)` The location to go to after action execution.
    `void` | `setParse(boolean parse)` Set parse to `true` to indicate that the location should be parsed as an OGNL expression.

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### DEFAULT_PARAM

          public static final String DEFAULT_PARAM

      The default parameter
      See Also:
        Constant Field Values

    - #### DEFAULT_URL_ENCODING

          public static final String DEFAULT_URL_ENCODING

      use UTF-8 as this is the recommended encoding by W3C to avoid incompatibilities.
      See Also:
        Constant Field Values

    - #### parseLocation

          protected boolean parseLocation

  - ### Constructor Detail

    - #### StrutsResultSupport

          public StrutsResultSupport()

    - #### StrutsResultSupport

          public StrutsResultSupport(String location)

    - #### StrutsResultSupport

          public StrutsResultSupport(String location,
                             boolean parse,
                             boolean encode)

  - ### Method Detail

    - #### setLocation

          public void setLocation(String location)

      The location to go to after action execution. This could be a JSP page or another action. The location can contain OGNL expressions which will be evaulated if the `parse` parameter is set to `true`.
      Parameters:
        `location` - the location to go to after action execution.
      See Also:
        `setParse(boolean)`

    - #### getLocation

          public String getLocation()

      Gets the location it was created with, mainly for testing
      Returns:
        the location

    - #### getLastFinalLocation

          public String getLastFinalLocation()

      Returns the last parsed and encoded location value
      Returns:
        the last final location

    - #### setParse

          public void setParse(boolean parse)

      Set parse to `true` to indicate that the location should be parsed as an OGNL expression. This is set to `true` by default.
      Parameters:
        `parse` - `true` if the location parameter is an OGNL expression, `false` otherwise.

    - #### setEncode

          public void setEncode(boolean encode)

      Set encode to `true` to indicate that the location should be url encoded. This is set to `true` by default
      Parameters:
        `encode` - `true` if the location parameter should be url encode, `false` otherwise.

    - #### execute

          public void execute(ActionInvocation invocation)
                       throws Exception

      Implementation of the `execute` method from the `Result` interface. This will call the abstract method `doExecute(String, ActionInvocation)` after optionally evaluating the location as an OGNL evaluation.
      Specified by:
        `execute` in interface `Result`
      Parameters:
        `invocation` - the execution state of the action.
      Throws:
        `Exception` - if an error occurs while executing the result.

    - #### conditionalParse

          protected String conditionalParse(String param,
                                ActionInvocation invocation)

      Parses the parameter for OGNL expressions against the valuestack
      Parameters:
        `param` - The parameter value
        `invocation` - The action invocation instance
      Returns:
        the resulting string

    - #### conditionalParseCollection

          protected Collection<String> conditionalParseCollection(String param,
                                                      ActionInvocation invocation,
                                                      boolean excludeEmptyElements)

      As `conditionalParse(String, ActionInvocation)` but does not convert found object into String. If found object is a collection it is returned if found object is not a collection it is wrapped in one.
      Parameters:
        `param` - parameter
        `invocation` - action invocation
        `excludeEmptyElements` - 'true' for excluding empty elements
      Returns:
        the parsed collection of strings

    - #### doExecute

          protected abstract void doExecute(String finalLocation,
                       ActionInvocation invocation)
                                     throws Exception

      Executes the result given a final location (jsp page, action, etc) and the action invocation (the state in which the action was executed). Subclasses must implement this class to handle custom logic for result handling.
      Parameters:
        `finalLocation` - the location (jsp page, action, etc) to go to.
        `invocation` - the execution state of the action.
      Throws:
        `Exception` - if an error occurs while executing the result.

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