org.apache.uima.util

## Interface Settings

-     public interface Settings

  A `Settings` object holds the properties used for external parameter overrides. Similar to java.util.Properties but: - supports UTF-8 (so \\uXXXX escapes are not needed or supported) - keys must be valid Java identifiers (actually must not contain '=' ':' '}' or white-space) - reverses priority in that duplicate entries are ignored, i.e. once set values cannot be changed - multiple files can be loaded - values can contain references to other values, e.g. name = .... ${key} .... - arrays are represented as strings, e.g. '[elem1,elem2]', and can span multiple lines - '\' can be used in values to escape '$' '{' '[' ',' ']'
  Author:
    burn

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `Set<String>` | `getKeys()` Return a set of keys of all properties loaded
    `String` | `getSetting(String name)` Get the value of an external override setting.
    `String[]` | `getSettingArray(String name)` Get the array of values for an external override setting.
    `void` | `load(InputStream in)` Load properties from an input stream.
    `void` | `loadSystemDefaults()` Load properties from the comma-separated list of files specified in the system property UimaExternalOverrides Files are loaded in order --- so in descending priority.
    `String` | `lookUp(String name)` Look up the value for a property.

- - ### Method Detail

    - #### load

          void load(InputStream in)
             throws IOException

      Load properties from an input stream. Existing properties are not changed and a warning is logged if the new value is different. May be called multiple times, so effective search is in load order. Arrays are enclosed in [] and the elements may be separated by `,` or new-line, so can span multiple lines without using a final \
      Parameters:
        `in` - - Stream holding properties
      Throws:
        `IOException` - if name characters illegal

    - #### loadSystemDefaults

          void loadSystemDefaults()
                           throws ResourceConfigurationException

      Load properties from the comma-separated list of files specified in the system property UimaExternalOverrides Files are loaded in order --- so in descending priority.
      Throws:
        `ResourceConfigurationException` - wraps IOException

    - #### lookUp

          String lookUp(String name)
                 throws ResourceConfigurationException

      Look up the value for a property. Perform one substitution pass on ${key} substrings replacing them with the value for key. Recursively evaluate the value to be substituted. NOTE: infinite loops not detected! If the key variable has not been defined, an exception is thrown. To avoid evaluation and get ${key} in the output escape the $ or { Arrays are returned as a comma-separated string, e.g. "[elem1,elem2]" Note: escape characters are not removed as they may affect array separators.
      Parameters:
        `name` - - name to look up
      Returns:
        - value of property
      Throws:
        `ResourceConfigurationException` - if the value references an undefined property

    - #### getKeys

          Set<String> getKeys()

      Return a set of keys of all properties loaded
      Returns:
        - set of strings

    - #### getSetting

          String getSetting(String name)
                     throws ResourceConfigurationException

      Get the value of an external override setting.
      Parameters:
        `name` - - the name of the parameter
      Returns:
        - the value found in the settings file(s), or null if missing.
      Throws:
        `ResourceConfigurationException` - if the value references an undefined property, or the value is an array

    - #### getSettingArray

          String[] getSettingArray(String name)
                            throws ResourceConfigurationException

      Get the array of values for an external override setting.
      Parameters:
        `name` - - the name of the parameter
      Returns:
        - an array of values found in the settings file(s), or null if missing.
      Throws:
        `ResourceConfigurationException` - if the value references an undefined property, or the value is not an array

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