org.apache.tools.ant.types.resources

## Class Union

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

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

    public class Union
    extends BaseResourceCollectionContainer

ResourceCollection representing the union of multiple nested 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
Constructor and Description
`Union()` Default constructor.
`Union(Project project)` Create a new Union.
`Union(Project project, ResourceCollection rc)` Convenience constructor.
`Union(ResourceCollection rc)` Convenience constructor.

### Method Summary

Methods
`protected java.util.Set<Resource>` `getAllResources()` Get the unified set of contained Resources.
`protected java.util.Collection<java.lang.String>` `getAllToStrings()` Get a collection of strings representing the unified resource set (strings may duplicate).
`protected java.util.Collection<Resource>` `getCollection()` Unify the contained Resources.
`protected <T> java.util.Collection<T>` `getCollection(boolean asString)` Deprecated.
`static Union` `getInstance(ResourceCollection rc)` Static convenience method to union an arbitrary set of Resources.
`java.lang.String[]` `list()` Returns all Resources in String format.
`Resource[]` `listResources()` Convenience method.

### Methods inherited from class org.apache.tools.ant.types.resources.BaseResourceCollectionContainer

`add, addAll, clear, clone, dieOnCircularReference, getResourceCollections, isCache, isFilesystemOnly, iterator, setCache, size, toString`

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

`checkAttributesAllowed, checkChildrenAllowed, circularReference, 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`

### Constructor Detail

#### Union

    public Union()

Default constructor.

#### Union

    public Union(Project project)

Create a new Union.

Parameters:
  `project` - owning Project

#### Union

    public Union(ResourceCollection rc)

Convenience constructor.

Parameters:
  `rc` - the ResourceCollection to add.

#### Union

    public Union(Project project,
         ResourceCollection rc)

Convenience constructor.

Parameters:
  `project` - owning Project
  `rc` - the ResourceCollection to add.

### Method Detail

#### getInstance

    public static Union getInstance(ResourceCollection rc)

Static convenience method to union an arbitrary set of Resources.

Parameters:
  `rc` - a ResourceCollection.
Returns:
  a Union.

#### list

    public java.lang.String[] list()

Returns all Resources in String format. Provided for convenience in implementing Path.

Returns:
  String array of Resources.

#### listResources

    public Resource[] listResources()

Convenience method.

Returns:
  Resource[]

#### getCollection

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

Unify the contained Resources.

Specified by:
  `getCollection` in class `BaseResourceCollectionContainer`
Returns:
  a Collection of Resources.

#### getCollection

    @Deprecated
    protected <T> java.util.Collection<T> getCollection(boolean asString)

Deprecated.
Unify the contained Resources.

Parameters:
  `asString` - indicates whether the resulting Collection should contain Strings instead of Resources.
Returns:
  a Collection of Resources.

#### getAllToStrings

    protected java.util.Collection<java.lang.String> getAllToStrings()

Get a collection of strings representing the unified resource set (strings may duplicate).

Returns:
  Collection<String>

#### getAllResources

    protected java.util.Set<Resource> getAllResources()

Get the unified set of contained Resources.

Returns:
  Set<Resource>