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
  Direct Known Subclasses:
    Difference, Intersect, Union

      public abstract class BaseResourceCollectionContainer
      extends DataType
      implements ResourceCollection, 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
    Constructor and Description
    `BaseResourceCollectionContainer()` Create a new BaseResourceCollectionContainer.
    `BaseResourceCollectionContainer(Project project)` Create a new BaseResourceCollectionContainer.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `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 BaseResourceCollectionContainer` | `getCheckedRef()` Performs the check for circular references and returns the referenced object.
    `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, 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 org.apache.tools.ant.types.ResourceCollection

      `isEmpty, stream`

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

      `forEach, spliterator`

- - ### 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.
      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`.

    - #### getCheckedRef

          protected BaseResourceCollectionContainer getCheckedRef()

      Description copied from class: `DataType`
      Performs the check for circular references and returns the referenced object.
      Overrides:
        `getCheckedRef` in class `DataType`
      Returns:
        the dereferenced object.