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## weka.core
Class Environment

    java.lang.Object
      weka.core.Environment

All Implemented Interfaces:
  RevisionHandler

    public class Environment

extends java.lang.Object
implements RevisionHandler

This class encapsulates a map of all environment and java system properties. There are methods for adding and removing variables as well as a method for replacing key names (enclosed by ${}) with their associated value in Strings.

Version:
  $Revision: 5987 $
Author:
  Mark Hall (mhall{[at]}pentaho{[dot]}com)

Constructor Summary
`Environment()`

Method Summary
`void` | `addVariable(java.lang.String key, java.lang.String value)` Add a variable to the internal map.
`static boolean` | `containsEnvVariables(java.lang.String source)` Tests for the presence of environment variables.
`java.lang.String` | `getRevision()` Returns the revision string.
`static Environment` | `getSystemWide()` Get the singleton system-wide (visible to every class in the running VM) set of environment variables.
`java.util.Set<java.lang.String>` | `getVariableNames()` Get the names of the variables (keys) stored in the internal map.
`java.lang.String` | `getVariableValue(java.lang.String key)` Get the value for a particular variable.
`static void` | `main(java.lang.String[] args)` Main method for testing this class.
`void` | `removeVariable(java.lang.String key)` Remove a named variable from the map.
`java.lang.String` | `substitute(java.lang.String source)` Substitute a variable names for their values in the given string.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Environment

    public Environment()

Method Detail

### getSystemWide

    public static Environment getSystemWide()

  Get the singleton system-wide (visible to every class in the running VM) set of environment variables.

  Returns:
    the system-wide set of environment variables.

### containsEnvVariables

    public static boolean containsEnvVariables(java.lang.String source)

  Tests for the presence of environment variables.

  Parameters:
    `source` - the string to test
  Returns:
    true if the argument contains one or more environment variables

### substitute

    public java.lang.String substitute(java.lang.String source)
                                throws java.lang.Exception

  Substitute a variable names for their values in the given string.

  Parameters:
    `source` - the source string to replace variables in
  Returns:
    a String with all variable names replaced with their values
  Throws:
    `java.lang.Exception` - if an unknown variable name is encountered

### addVariable

    public void addVariable(java.lang.String key,
                            java.lang.String value)

  Add a variable to the internal map.

  Parameters:
    `key` - the name of the variable
    `value` - its value

### removeVariable

    public void removeVariable(java.lang.String key)

  Remove a named variable from the map.

  Parameters:
    `key` - the name of the varaible to remove.

### getVariableNames

    public java.util.Set<java.lang.String> getVariableNames()

  Get the names of the variables (keys) stored in the internal map.

  Returns:
    a Set of variable names (keys)

### getVariableValue

    public java.lang.String getVariableValue(java.lang.String key)

  Get the value for a particular variable.

  Parameters:
    `key` - the name of the variable to get
  Returns:
    the associated value or null if this variable is not in the internal map

### main

    public static void main(java.lang.String[] args)

  Main method for testing this class.

  Parameters:
    `args` - a list of strings to replace variables in (e.g. "\${os.name} "\${java.version}")

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Returns:
    the revision

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