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
`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
`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.