## 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, 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
`Union()` Default constructor.
`Union(ResourceCollection rc)` Convenience constructor.

Method Summary
`protected java.util.Collection` `getCollection()` Unify the contained Resources.
`protected java.util.Collection` `getCollection(boolean asString)` Unify the contained Resources.
`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, 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(ResourceCollection rc)

  Convenience constructor.

  Parameters:
    `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 getCollection()

  Unify the contained Resources.

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

### getCollection

    protected java.util.Collection getCollection(boolean asString)

  Unify the contained Resources.

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