Class EnvarBasedValueSource

  • All Implemented Interfaces:
    FixedValueSource

    public class EnvarBasedValueSource
    extends Object
    implements FixedValueSource
    ValueSource which resolves expressions against the environment variables available from the underlying operating system (and possibly, the shell environment that created the present Java process). If the expression starts with 'env.', this prefix is trimmed before resolving the rest as an environment variable name.
    • Constructor Detail

      • EnvarBasedValueSource

        public EnvarBasedValueSource()
                              throws IOException
        Create a new value source for interpolation based on shell environment variables. In this case, envar keys ARE CASE SENSITIVE.
        Throws:
        IOException - in case of an error.
      • EnvarBasedValueSource

        public EnvarBasedValueSource​(boolean caseSensitive)
                              throws IOException
        Create a new value source for interpolation based on shell environment variables.
        Parameters:
        caseSensitive - Whether the environment variable key should be treated in a case-sensitive manner for lookups
        Throws:
        IOException - in case of an error.
    • Method Detail

      • getValue

        public Object getValue​(String expression,
                               InterpolationState interpolationState)
        If the expression starts with 'env.' then trim this prefix. Next, resolve the (possibly trimmed) expression as an environment variable name against the collection of environment variables that were read from the operating system when this ValueSource instance was created.
        Specified by:
        getValue in interface FixedValueSource
        Parameters:
        expression - envar expression, like 'HOME' or 'env.HOME'
        interpolationState - InterpolationState.
        Returns:
        the environment variable value for the given expression