org.apache.tools.ant.types.resources.comparators

## Class Exists

- java.lang.Object
- - org.apache.tools.ant.ProjectComponent
  - - org.apache.tools.ant.types.DataType
    - - org.apache.tools.ant.types.resources.comparators.ResourceComparator
      - - org.apache.tools.ant.types.resources.comparators.Exists

- All Implemented Interfaces:
    java.lang.Cloneable, java.util.Comparator<Resource>

      public class Exists
      extends ResourceComparator

  Compares Resources by existence. Not existing is "less than" existing.
  Since:
    Ant 1.7

- - ### Field Summary

    - ### Fields inherited from class org.apache.tools.ant.types.DataType

      `checked, ref`

    - ### Fields inherited from class org.apache.tools.ant.ProjectComponent

      `description, location, project`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Exists()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected int` | `resourceCompare(Resource foo, Resource bar)` Compare two Resources.

    - ### Methods inherited from class org.apache.tools.ant.types.resources.comparators.ResourceComparator

      `compare, equals, hashCode`

    - ### Methods inherited from class org.apache.tools.ant.types.DataType

      `checkAttributesAllowed, checkChildrenAllowed, circularReference, clone, dieOnCircularReference, dieOnCircularReference, dieOnCircularReference, getCheckedRef, getCheckedRef, getCheckedRef, getCheckedRef, getDataTypeName, getRefid, invokeCircularReferenceCheck, isChecked, isReference, noChildrenAllowed, pushAndInvokeCircularReferenceCheck, setChecked, setRefid, tooManyAttributes, toString`

    - ### Methods inherited from class org.apache.tools.ant.ProjectComponent

      `getDescription, getLocation, getProject, log, log, setDescription, setLocation, setProject`

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

      `finalize, getClass, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface java.util.Comparator

      `comparing, comparing, comparingDouble, comparingInt, comparingLong, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong`

- - ### Constructor Detail

    - #### Exists

          public Exists()

  - ### Method Detail

    - #### resourceCompare

          protected int resourceCompare(Resource foo,
                                        Resource bar)

      Compare two Resources.
      Specified by:
        `resourceCompare` in class `ResourceComparator`
      Parameters:
        `foo` - the first Resource.
        `bar` - the second Resource.
      Returns:
        a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.