AbstractResourceCollectionWrapper (Apache Ant API)
Date: 2018-03-24

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
    Constructor and Description
    `AbstractResourceCollectionWrapper()`

  - ### 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.
    `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, 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

    - #### 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`.