Package org.apache.tools.ant.types.resources

## Class BaseResourceCollectionContainer

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

All Implemented Interfaces:
  `java.lang.Cloneable`, `java.lang.Iterable<Resource>`, `ResourceCollection`, `AppendableResourceCollection`

Direct Known Subclasses:
  `Difference`, `Intersect`, `Union`

    public abstract class BaseResourceCollectionContainer
    extends DataType
    implements AppendableResourceCollection, java.lang.Cloneable

Base class for ResourceCollections that nest multiple ResourceCollections.

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
`BaseResourceCollectionContainer()` Create a new BaseResourceCollectionContainer.
`BaseResourceCollectionContainer​(Project project)` Create a new BaseResourceCollectionContainer.

### Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
`void` `add​(ResourceCollection c)` Add a ResourceCollection to the container.
`void` `addAll​(java.util.Collection<? extends ResourceCollection> c)` Add the Collection of ResourceCollections to the container.
`void` `clear()` Clear the container.
`java.lang.Object` `clone()` Implement clone.
`protected void` `dieOnCircularReference​(java.util.Stack<java.lang.Object> stk, Project p)` Overrides the version of DataType to recurse on all DataType child elements that may have been added.
`protected abstract java.util.Collection<Resource>` `getCollection()` Template method for subclasses to return a Collection object of Resources.
`java.util.List<ResourceCollection>` `getResourceCollections()` Get the nested ResourceCollections.
`boolean` `isCache()` Learn whether to cache collections.
`boolean` `isFilesystemOnly()` Fulfill the ResourceCollection contract.
`java.util.Iterator<Resource>` `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 BaseResourceCollectionContainer as a String.

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

`checkAttributesAllowed, checkChildrenAllowed, circularReference, dieOnCircularReference, dieOnCircularReference, getCheckedRef, 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`

### Methods inherited from interface java.lang.Iterable

`forEach, spliterator`

### Methods inherited from interface org.apache.tools.ant.types.ResourceCollection

`isEmpty, stream`

### Constructor Detail

#### BaseResourceCollectionContainer

    public BaseResourceCollectionContainer()

Create a new BaseResourceCollectionContainer.

#### BaseResourceCollectionContainer

    public BaseResourceCollectionContainer​(Project project)

Create a new BaseResourceCollectionContainer.

Parameters:
  `project` - Project
Since:
  Ant 1.8

### Method Detail

#### setCache

    public void setCache​(boolean b)

Set whether to cache collections.

Parameters:
  `b` - boolean cache flag.

#### isCache

    public boolean isCache()

Learn whether to cache collections. Default is `true`.

Returns:
  boolean cache flag.

#### clear

    public void clear()
               throws BuildException

Clear the container.

Throws:
  `BuildException` - on error.

#### add

    public void add​(ResourceCollection c)
             throws BuildException

Add a ResourceCollection to the container.

Specified by:
  `add` in interface `AppendableResourceCollection`
Parameters:
  `c` - the ResourceCollection to add.
Throws:
  `BuildException` - on error.

#### addAll

    public void addAll​(java.util.Collection<? extends ResourceCollection> c)
                throws BuildException

Add the Collection of ResourceCollections to the container.

Parameters:
  `c` - the Collection whose elements to add.
Throws:
  `BuildException` - on error.

#### iterator

    public final java.util.Iterator<Resource> iterator()

Fulfill the ResourceCollection contract. The Iterator returned will throw ConcurrentModificationExceptions if ResourceCollections are added to this container while the Iterator is in use.

Specified by:
  `iterator` in interface `java.lang.Iterable<Resource>`
Returns:
  a "fail-fast" Iterator.

#### 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:
  whether this is a filesystem-only resource collection.

#### dieOnCircularReference

    protected void dieOnCircularReference​(java.util.Stack<java.lang.Object> 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.

#### getResourceCollections

    public final java.util.List<ResourceCollection> getResourceCollections()

Get the nested ResourceCollections.

Returns:
  List.

#### getCollection

    protected abstract java.util.Collection<Resource> getCollection()

Template method for subclasses to return a Collection object of Resources.

Returns:
  Collection.

#### clone

    public java.lang.Object clone()

Implement clone. The set of nested resource collections is shallowly cloned.

Overrides:
  `clone` in class `DataType`
Returns:
  a cloned instance.

#### toString

    public java.lang.String toString()

Format this BaseResourceCollectionContainer as a String.

Overrides:
  `toString` in class `DataType`
Returns:
  a descriptive `String`.