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

## Class AbstractResourceCollectionWrapper

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

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

Direct Known Subclasses:
  `BaseResourceCollectionWrapper`, `LazyResourceCollectionWrapper`

    public abstract class AbstractResourceCollectionWrapper
    extends DataType
    implements ResourceCollection, java.lang.Cloneable

Base class for a ResourceCollection that wraps a single nested ResourceCollection.

Since:
  Ant 1.8.2

### 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
`AbstractResourceCollectionWrapper()`

### Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
`void` `add​(ResourceCollection c)` Add a ResourceCollection to the container.
`protected abstract java.util.Iterator<Resource>` `createIterator()` Do create an iterator on the resource collection.
`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 ResourceCollection` `getResourceCollection()` Get the nested ResourceCollection.
`protected abstract int` `getSize()` Do compute the size of the resource collection.
`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 AbstractResourceCollectionWrapper as a String.

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

`checkAttributesAllowed, checkChildrenAllowed, circularReference, clone, 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

#### AbstractResourceCollectionWrapper

    public AbstractResourceCollectionWrapper()

### 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.

#### add

    public void add​(ResourceCollection c)
             throws BuildException

Add a ResourceCollection to the container.

Parameters:
  `c` - the ResourceCollection to add.
Throws:
  `BuildException` - on error.

#### iterator

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

Fulfill the ResourceCollection contract.

Specified by:
  `iterator` in interface `java.lang.Iterable<Resource>`
Returns:
  an Iterator of Resources.

#### createIterator

    protected abstract java.util.Iterator<Resource> createIterator()

Do create an iterator on the resource collection. The creation of the iterator is allowed to not be thread safe whereas the iterator itself should. The returned iterator will be wrapped into the FailFast one.

Returns:
  the iterator on the resource collection

#### size

    public int size()

Fulfill the ResourceCollection contract.

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

#### getSize

    protected abstract int getSize()

Do compute the size of the resource collection. The implementation of this function is allowed to be not thread safe.

Returns:
  size of resource collection.

#### 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.

#### getResourceCollection

    protected final ResourceCollection getResourceCollection()

Get the nested ResourceCollection.

Returns:
  a ResourceCollection.
Throws:
  `BuildException` - if no nested ResourceCollection has been provided.

#### toString

    public java.lang.String toString()

Format this AbstractResourceCollectionWrapper as a String.

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