org.apache.tools.ant.types.resources

## Class Resources

- java.lang.Object
- - org.apache.tools.ant.ProjectComponent
  - - org.apache.tools.ant.types.DataType
    - - org.apache.tools.ant.types.resources.Resources

- All Implemented Interfaces:
    java.lang.Cloneable, ResourceCollection

      public class Resources
      extends DataType
      implements ResourceCollection

  Generic ResourceCollection: Either stores nested ResourceCollections, making no attempt to remove duplicates, or references another ResourceCollection.
  Since:
    Ant 1.7

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static java.util.Iterator` | `EMPTY_ITERATOR` static empty Iterator
    `static ResourceCollection` | `NONE` static empty ResourceCollection

    - ### 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
    `Resources()` Create a new Resources.
    `Resources(Project project)` Create a new Resources.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `add(ResourceCollection c)` Add a ResourceCollection.
    `protected void` | `dieOnCircularReference(java.util.Stack stk, Project p)` Overrides the version of DataType to recurse on all DataType child elements that may have been added.
    `protected void` | `invalidateExistingIterators()` Allow subclasses to notify existing Iterators they have experienced concurrent modification.
    `boolean` | `isFilesystemOnly()` Fulfill the ResourceCollection contract.
    `java.util.Iterator` | `iterator()` Fulfill the ResourceCollection contract.
    `void` | `setCache(boolean b)` Set whether to cache collections.
    `int` | `size()` Fulfill the ResourceCollection contract.
    `java.lang.String` | `toString()` Format this `Resources` as a String.

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

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

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

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

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

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

- - ### Field Detail

    - #### NONE

          public static final ResourceCollection NONE

      static empty ResourceCollection

    - #### EMPTY_ITERATOR

          public static final java.util.Iterator EMPTY_ITERATOR

      static empty Iterator

  - ### Constructor Detail

    - #### Resources

          public Resources()

      Create a new Resources.

    - #### Resources

          public Resources(Project project)

      Create a new Resources.
      Since:
        Ant 1.8

  - ### Method Detail

    - #### setCache

          public void setCache(boolean b)

      Set whether to cache collections.
      Parameters:
        `b` - boolean cache flag.
      Since:
        Ant 1.8.0

    - #### add

          public void add(ResourceCollection c)

      Add a ResourceCollection.
      Parameters:
        `c` - the ResourceCollection to add.

    - #### iterator

          public java.util.Iterator iterator()

      Fulfill the ResourceCollection contract.
      Specified by:
        `iterator` in interface `ResourceCollection`
      Returns:
        an Iterator of Resources.

    - #### size

          public int size()

      Fulfill the ResourceCollection contract.
      Specified by:
        `size` in interface `ResourceCollection`
      Returns:
        number of elements as int.

    - #### isFilesystemOnly

          public boolean isFilesystemOnly()

      Fulfill the ResourceCollection contract.
      Specified by:
        `isFilesystemOnly` in interface `ResourceCollection`
      Returns:
        true if all Resources represent files.

    - #### toString

          public java.lang.String toString()

      Format this `Resources` as a String.
      Overrides:
        `toString` in class `DataType`
      Returns:
        a descriptive `String`.

    - #### dieOnCircularReference

          protected void dieOnCircularReference(java.util.Stack stk,
                                    Project p)
                                         throws BuildException

      Overrides the version of DataType to recurse on all DataType child elements that may have been added.
      Overrides:
        `dieOnCircularReference` in class `DataType`
      Parameters:
        `stk` - the stack of data types to use (recursively).
        `p` - the project to use to dereference the references.
      Throws:
        `BuildException` - on error.

    - #### invalidateExistingIterators

          protected void invalidateExistingIterators()

      Allow subclasses to notify existing Iterators they have experienced concurrent modification.