Package 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:
  `Cloneable`, `Iterable<Resource>`, `ResourceCollection`, `AppendableResourceCollection`

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
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

Modifier and Type
Method
Description
`protected Set<Resource>`
`getAllResources()`
Get the unified set of contained Resources.
`protected Collection<String>`
`getAllToStrings()`
Get a collection of strings representing the unified resource set (strings may duplicate).
`protected Collection<Resource>`
`getCollection()`
Unify the contained Resources.
`protected <T> Collection<T>`
`getCollection(boolean asString)`
Deprecated.
`static Union`
`getInstance(ResourceCollection rc)`
Static convenience method to union an arbitrary set of Resources.
`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, 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 Details

### 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 Details

### 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 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 Collection<Resource> getCollection()
Unify the contained Resources.

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

### getCollection

@Deprecated protected <T> Collection<T> getCollection(boolean asString)
Deprecated.
Unify the contained Resources.

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

### getAllToStrings

protected Collection<String> getAllToStrings()
Get a collection of strings representing the unified resource set (strings may duplicate).

Returns:
  Collection<String>

### getAllResources

protected Set<Resource> getAllResources()
Get the unified set of contained Resources.

Returns:
  Set<Resource>