com.opensymphony.xwork2.util.location

## Class LocationUtils

- java.lang.Object
- - com.opensymphony.xwork2.util.location.LocationUtils

-     public class LocationUtils
      extends Object

  Location-related utility methods.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static interface` | `LocationUtils.LocationFinder` An finder or object locations

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `UNKNOWN_STRING` The string representation of an unknown location: "`[unknown location]`".

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static void` | `addFinder(LocationUtils.LocationFinder finder)` Add a `LocationUtils.LocationFinder` to the list of finders that will be queried for an object's location by `getLocation(Object, String)`.
    `static Location` | `getLocation(Object obj)` Get the location of an object.
    `static Location` | `getLocation(Object obj, String description)` Get the location of an object.
    `static boolean` | `isKnown(Location location)` Checks if a location is known, i.e.
    `static boolean` | `isUnknown(Location location)` Checks if a location is unknown, i.e.
    `static LocationImpl` | `parse(String text)` Parse a location string of the form "`uri:line:column`" (e.g.
    `static String` | `toString(Location location)` Builds a string representation of a location, in the "`descripton - uri:line:column`" format (e.g.

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

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

- - ### Field Detail

    - #### UNKNOWN_STRING

          public static final String UNKNOWN_STRING

      The string representation of an unknown location: "`[unknown location]`".
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### toString

          public static String toString(Location location)

      Builds a string representation of a location, in the "`descripton - uri:line:column`" format (e.g. "`foo - file://path/to/file.xml:3:40`"). For `an unknown location`, returns `UNKNOWN_STRING`.
      Parameters:
        `location` - location object
      Returns:
        the string representation

    - #### parse

          public static LocationImpl parse(String text)
                                    throws IllegalArgumentException

      Parse a location string of the form "`uri:line:column`" (e.g. "`path/to/file.xml:3:40`") to a Location object. Additionally, a description may also optionally be present, separated with an hyphen (e.g. "`foo - path/to/file.xml:3.40`").
      Parameters:
        `text` - the text to parse
      Returns:
        the location (possibly `null` if text was null or in an incorrect format)
      Throws:
        `IllegalArgumentException`

    - #### isKnown

          public static boolean isKnown(Location location)

      Checks if a location is known, i.e. it is not null nor equal to `Location.UNKNOWN`.
      Parameters:
        `location` - the location to check
      Returns:
        `true` if the location is known

    - #### isUnknown

          public static boolean isUnknown(Location location)

      Checks if a location is unknown, i.e. it is either null or equal to `Location.UNKNOWN`.
      Parameters:
        `location` - the location to check
      Returns:
        `true` if the location is unknown

    - #### addFinder

          public static void addFinder(LocationUtils.LocationFinder finder)

      Add a `LocationUtils.LocationFinder` to the list of finders that will be queried for an object's location by `getLocation(Object, String)`.

      Important: LocationUtils internally stores a weak reference to the finder. This avoids creating strong links between the classloader holding this class and the finder's classloader, which can cause some weird memory leaks if the finder's classloader is to be reloaded. Therefore, you have to keep a strong reference to the finder in the calling code, e.g.:

             private static LocationUtils.LocationFinder myFinder =
                 new LocationUtils.LocationFinder() {
                     public Location getLocation(Object obj, String desc) {
                         ...
                     }
                 };

             static {
                 LocationUtils.addFinder(myFinder);
             }

      Parameters:
        `finder` - the location finder to add

    - #### getLocation

          public static Location getLocation(Object obj)

      Get the location of an object. Some well-known located classes built in the JDK are handled by this method. Handling of other located classes can be handled by adding new location finders.
      Parameters:
        `obj` - the object of which to get the location
      Returns:
        the object's location, or `Location.UNKNOWN` if no location could be found

    - #### getLocation

          public static Location getLocation(Object obj,
                                             String description)

      Get the location of an object. Some well-known located classes built in the JDK are handled by this method. Handling of other located classes can be handled by adding new location finders.
      Parameters:
        `obj` - the object of which to get the location
        `description` - an optional description of the object's location, used if a Location object has to be created.
      Returns:
        the object's location, or `Location.UNKNOWN` if no location could be found

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