Module javafx.base
Package javafx.beans.binding

## Class ListExpression<E>

- java.lang.Object
- - javafx.beans.binding.ListExpression<E>

- Type Parameters:
    `E` - the type of the `List` elements.
  All Implemented Interfaces:
    `Iterable<E>`, `Collection<E>`, `List<E>`, `Observable`, `ObservableListValue<E>`, `ObservableObjectValue<ObservableList<E>>`, `ObservableValue<ObservableList<E>>`, `ObservableList<E>`
  Direct Known Subclasses:
    `ListBinding`, `ReadOnlyListProperty`

      public abstract class ListExpression<E>
      extends Object
      implements ObservableListValue<E>

  `ListExpression` is an `ObservableListValue` plus additional convenience methods to generate bindings in a fluent style.

  A concrete sub-class of `ListExpression` has to implement the method `ObservableObjectValue.get()`, which provides the actual value of this expression.

  If the wrapped list of a `ListExpression` is `null`, all methods implementing the `List` interface will behave as if they were applied to an immutable empty list.

  Since:
    JavaFX 2.1

- - ### Property Summary

    Properties
    Type | Property | Description
    --- | --- | ---
    `abstract ReadOnlyBooleanProperty` | `empty` | A boolean property that is `true`, if the list is empty.
    `abstract ReadOnlyIntegerProperty` | `size` | An integer property that represents the size of the list.

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `ListExpression()` |

  - ### Method Summary

    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `add​(int i, E element)` |
    `boolean` | `add​(E element)` |
    `boolean` | `addAll​(int i, Collection<? extends E> elements)` |
    `boolean` | `addAll​(E... elements)` | A convenience method for var-arg addition of elements.
    `boolean` | `addAll​(Collection<? extends E> elements)` |
    `StringBinding` | `asString()` | Creates a `StringBinding` that holds the value of the `ListExpression` turned into a `String`.
    `void` | `clear()` |
    `boolean` | `contains​(Object obj)` |
    `boolean` | `containsAll​(Collection<?> objects)` |
    `abstract ReadOnlyBooleanProperty` | `emptyProperty()` | A boolean property that is `true`, if the list is empty.
    `E` | `get​(int i)` |
    `int` | `getSize()` | The size of the list
    `ObservableList<E>` | `getValue()` | Returns the current value of this `ObservableValue`
    `int` | `indexOf​(Object obj)` |
    `boolean` | `isEmpty()` | Gets the value of the property empty.
    `BooleanBinding` | `isEqualTo​(ObservableList<?> other)` | Creates a new `BooleanBinding` that holds `true` if this list is equal to another `ObservableList`.
    `BooleanBinding` | `isNotEqualTo​(ObservableList<?> other)` | Creates a new `BooleanBinding` that holds `true` if this list is not equal to another `ObservableList`.
    `BooleanBinding` | `isNotNull()` | Creates a new `BooleanBinding` that holds `true` if the wrapped list is not `null`.
    `BooleanBinding` | `isNull()` | Creates a new `BooleanBinding` that holds `true` if the wrapped list is `null`.
    `Iterator<E>` | `iterator()` |
    `int` | `lastIndexOf​(Object obj)` |
    `static <E> ListExpression<E>` | `listExpression​(ObservableListValue<E> value)` | Returns a `ListExpression` that wraps a `ObservableListValue`.
    `ListIterator<E>` | `listIterator()` |
    `ListIterator<E>` | `listIterator​(int i)` |
    `E` | `remove​(int i)` |
    `void` | `remove​(int from, int to)` | A simplified way of calling `sublist(from, to).clear()`.
    `boolean` | `remove​(Object obj)` |
    `boolean` | `removeAll​(E... elements)` | A convenience method for var-arg usage of the `removeAll` method.
    `boolean` | `removeAll​(Collection<?> objects)` |
    `boolean` | `retainAll​(E... elements)` | A convenience method for var-arg usage of the `retainAll` method.
    `boolean` | `retainAll​(Collection<?> objects)` |
    `E` | `set​(int i, E element)` |
    `boolean` | `setAll​(E... elements)` | Clears the ObservableList and adds all the elements passed as var-args.
    `boolean` | `setAll​(Collection<? extends E> elements)` | Clears the ObservableList and adds all elements from the collection.
    `int` | `size()` |
    `abstract ReadOnlyIntegerProperty` | `sizeProperty()` | An integer property that represents the size of the list.
    `List<E>` | `subList​(int from, int to)` |
    `Object[]` | `toArray()` |
    `<T> T[]` | `toArray​(T[] array)` |
    `ObjectBinding<E>` | `valueAt​(int index)` | Creates a new `ObjectBinding` that contains the element at the specified position.
    `ObjectBinding<E>` | `valueAt​(ObservableIntegerValue index)` | Creates a new `ObjectBinding` that contains the element at the specified position.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface java.util.Collection

      `parallelStream, removeIf, stream, toArray`

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

      `forEach`

    - ### Methods inherited from interface java.util.List

      `equals, hashCode, replaceAll, sort, spliterator`

    - ### Methods inherited from interface javafx.beans.Observable

      `addListener, removeListener`

    - ### Methods inherited from interface javafx.collections.ObservableList

      `addListener, filtered, removeListener, sorted, sorted`

    - ### Methods inherited from interface javafx.beans.value.ObservableObjectValue

      `get`

    - ### Methods inherited from interface javafx.beans.value.ObservableValue

      `addListener, removeListener`

- - ### Property Detail

    - #### size

          public abstract ReadOnlyIntegerProperty sizeProperty

      An integer property that represents the size of the list.
      See Also:
        `getSize()`

    - #### empty

          public abstract ReadOnlyBooleanProperty emptyProperty

      A boolean property that is `true`, if the list is empty.
      See Also:
        `isEmpty()`

  - ### Constructor Detail

    - #### ListExpression

          public ListExpression()

  - ### Method Detail

    - #### getValue

          public ObservableList<E> getValue()

      Description copied from interface: `ObservableValue`
      Returns the current value of this `ObservableValue`
      Specified by:
        `getValue` in interface `ObservableValue<E>`
      Returns:
        The current value

    - #### listExpression

          public static <E> ListExpression<E> listExpression​(ObservableListValue<E> value)

      Returns a `ListExpression` that wraps a `ObservableListValue`. If the `ObservableListValue` is already a `ListExpression`, it will be returned. Otherwise a new `ListBinding` is created that is bound to the `ObservableListValue`.
      Type Parameters:
        `E` - the type of the wrapped `List`
      Parameters:
        `value` - The source `ObservableListValue`
      Returns:
        A `ListExpression` that wraps the `ObservableListValue` if necessary
      Throws:
        `NullPointerException` - if `value` is `null`

    - #### getSize

          public int getSize()

      The size of the list
      Returns:
        the size

    - #### sizeProperty

          public abstract ReadOnlyIntegerProperty sizeProperty()

      An integer property that represents the size of the list.
      See Also:
        `getSize()`

    - #### emptyProperty

          public abstract ReadOnlyBooleanProperty emptyProperty()

      A boolean property that is `true`, if the list is empty.
      See Also:
        `isEmpty()`

    - #### valueAt

          public ObjectBinding<E> valueAt​(int index)

      Creates a new `ObjectBinding` that contains the element at the specified position. If `index` points behind the list, the `ObjectBinding` contains `null`.
      Parameters:
        `index` - the index of the element
      Returns:
        the `ObjectBinding`
      Throws:
        `IllegalArgumentException` - if `index < 0`

    - #### valueAt

          public ObjectBinding<E> valueAt​(ObservableIntegerValue index)

      Creates a new `ObjectBinding` that contains the element at the specified position. If `index` points outside of the list, the `ObjectBinding` contains `null`.
      Parameters:
        `index` - the index of the element
      Returns:
        the `ObjectBinding`
      Throws:
        `NullPointerException` - if `index` is `null`

    - #### isEqualTo

          public BooleanBinding isEqualTo​(ObservableList<?> other)

      Creates a new `BooleanBinding` that holds `true` if this list is equal to another `ObservableList`.
      Parameters:
        `other` - the other `ObservableList`
      Returns:
        the new `BooleanBinding`
      Throws:
        `NullPointerException` - if `other` is `null`

    - #### isNotEqualTo

          public BooleanBinding isNotEqualTo​(ObservableList<?> other)

      Creates a new `BooleanBinding` that holds `true` if this list is not equal to another `ObservableList`.
      Parameters:
        `other` - the other `ObservableList`
      Returns:
        the new `BooleanBinding`
      Throws:
        `NullPointerException` - if `other` is `null`

    - #### isNull

          public BooleanBinding isNull()

      Creates a new `BooleanBinding` that holds `true` if the wrapped list is `null`.
      Returns:
        the new `BooleanBinding`

    - #### isNotNull

          public BooleanBinding isNotNull()

      Creates a new `BooleanBinding` that holds `true` if the wrapped list is not `null`.
      Returns:
        the new `BooleanBinding`

    - #### asString

          public StringBinding asString()

      Creates a `StringBinding` that holds the value of the `ListExpression` turned into a `String`. If the value of this `ListExpression` changes, the value of the `StringBinding` will be updated automatically.
      Returns:
        the new `StringBinding`

    - #### size

          public int size()

      Specified by:
        `size` in interface `Collection<E>`
      Specified by:
        `size` in interface `List<E>`

    - #### isEmpty

          public boolean isEmpty()

      Gets the value of the property empty.
      Specified by:
        `isEmpty` in interface `Collection<E>`
      Specified by:
        `isEmpty` in interface `List<E>`
      Property description:
        A boolean property that is `true`, if the list is empty.

    - #### contains

          public boolean contains​(Object obj)

      Specified by:
        `contains` in interface `Collection<E>`
      Specified by:
        `contains` in interface `List<E>`

    - #### iterator

          public Iterator<E> iterator()

      Specified by:
        `iterator` in interface `Collection<E>`
      Specified by:
        `iterator` in interface `Iterable<E>`
      Specified by:
        `iterator` in interface `List<E>`

    - #### toArray

          public Object[] toArray()

      Specified by:
        `toArray` in interface `Collection<E>`
      Specified by:
        `toArray` in interface `List<E>`

    - #### toArray

          public <T> T[] toArray​(T[] array)

      Specified by:
        `toArray` in interface `Collection<E>`
      Specified by:
        `toArray` in interface `List<E>`

    - #### add

          public boolean add​(E element)

      Specified by:
        `add` in interface `Collection<E>`
      Specified by:
        `add` in interface `List<E>`

    - #### remove

          public boolean remove​(Object obj)

      Specified by:
        `remove` in interface `Collection<E>`
      Specified by:
        `remove` in interface `List<E>`

    - #### containsAll

          public boolean containsAll​(Collection<?> objects)

      Specified by:
        `containsAll` in interface `Collection<E>`
      Specified by:
        `containsAll` in interface `List<E>`

    - #### addAll

          public boolean addAll​(Collection<? extends E> elements)

      Specified by:
        `addAll` in interface `Collection<E>`
      Specified by:
        `addAll` in interface `List<E>`

    - #### addAll

          public boolean addAll​(int i,
                                Collection<? extends E> elements)

      Specified by:
        `addAll` in interface `List<E>`

    - #### removeAll

          public boolean removeAll​(Collection<?> objects)

      Specified by:
        `removeAll` in interface `Collection<E>`
      Specified by:
        `removeAll` in interface `List<E>`

    - #### retainAll

          public boolean retainAll​(Collection<?> objects)

      Specified by:
        `retainAll` in interface `Collection<E>`
      Specified by:
        `retainAll` in interface `List<E>`

    - #### clear

          public void clear()

      Specified by:
        `clear` in interface `Collection<E>`
      Specified by:
        `clear` in interface `List<E>`

    - #### get

          public E get​(int i)

      Specified by:
        `get` in interface `List<E>`

    - #### set

          public E set​(int i,
                       E element)

      Specified by:
        `set` in interface `List<E>`

    - #### add

          public void add​(int i,
                          E element)

      Specified by:
        `add` in interface `List<E>`

    - #### remove

          public E remove​(int i)

      Specified by:
        `remove` in interface `List<E>`

    - #### indexOf

          public int indexOf​(Object obj)

      Specified by:
        `indexOf` in interface `List<E>`

    - #### lastIndexOf

          public int lastIndexOf​(Object obj)

      Specified by:
        `lastIndexOf` in interface `List<E>`

    - #### listIterator

          public ListIterator<E> listIterator()

      Specified by:
        `listIterator` in interface `List<E>`

    - #### listIterator

          public ListIterator<E> listIterator​(int i)

      Specified by:
        `listIterator` in interface `List<E>`

    - #### subList

          public List<E> subList​(int from,
                                 int to)

      Specified by:
        `subList` in interface `List<E>`

    - #### addAll

          public boolean addAll​(E... elements)

      Description copied from interface: `ObservableList`
      A convenience method for var-arg addition of elements.
      Specified by:
        `addAll` in interface `ObservableList<E>`
      Parameters:
        `elements` - the elements to add
      Returns:
        true (as specified by Collection.add(E))

    - #### setAll

          public boolean setAll​(E... elements)

      Description copied from interface: `ObservableList`
      Clears the ObservableList and adds all the elements passed as var-args.
      Specified by:
        `setAll` in interface `ObservableList<E>`
      Parameters:
        `elements` - the elements to set
      Returns:
        true (as specified by Collection.add(E))

    - #### setAll

          public boolean setAll​(Collection<? extends E> elements)

      Description copied from interface: `ObservableList`
      Clears the ObservableList and adds all elements from the collection.
      Specified by:
        `setAll` in interface `ObservableList<E>`
      Parameters:
        `elements` - the collection with elements that will be added to this observableArrayList
      Returns:
        true (as specified by Collection.add(E))

    - #### removeAll

          public boolean removeAll​(E... elements)

      Description copied from interface: `ObservableList`
      A convenience method for var-arg usage of the `removeAll` method.
      Specified by:
        `removeAll` in interface `ObservableList<E>`
      Parameters:
        `elements` - the elements to be removed
      Returns:
        true if list changed as a result of this call

    - #### retainAll

          public boolean retainAll​(E... elements)

      Description copied from interface: `ObservableList`
      A convenience method for var-arg usage of the `retainAll` method.
      Specified by:
        `retainAll` in interface `ObservableList<E>`
      Parameters:
        `elements` - the elements to be retained
      Returns:
        true if list changed as a result of this call

    - #### remove

          public void remove​(int from,
                             int to)

      Description copied from interface: `ObservableList`
      A simplified way of calling `sublist(from, to).clear()`. As this is a common operation, ObservableList has this method for convenient usage.
      Specified by:
        `remove` in interface `ObservableList<E>`
      Parameters:
        `from` - the start of the range to remove (inclusive)
        `to` - the end of the range to remove (exclusive)