public class LazyDynaList extends ArrayList<Object>
There are two main purposes for this class:
List
with either DynaBean, java.util.Map
or POJO Beans.All elements added to the List are stored as DynaBean's:
java.util.Map elements are "wrapped" in a LazyDynaMap.
WrapDynaBean.
DynaBean's are stored un-changed.
toArray()The toArray() method returns an array of the
elements of the appropriate type. If the LazyDynaList
is populated with java.util.Map objects a
Map[] array is returned.
If the list is populated with POJO Beans an appropriate
array of the POJO Beans is returned. Otherwise a DynaBean[]
array is returned.
toDynaBeanArray()The toDynaBeanArray() method returns a
DynaBean[] array of the elements in the List.
N.B.All the elements in the List must be the
same type. If the DynaClass or Class
of the LazyDynaList's elements is
not specified, then it will be automatically set to the type
of the first element populated.
If you have an array of java.util.Map[] - you can put that into
a LazyDynaList.
TreeMap[] myArray = .... // your Map[]
List lazyList = new LazyDynaList(myArray);
New elements of the appropriate Map type are automatically populated:
// get(index) automatically grows the list
DynaBean newElement = (DynaBean)lazyList.get(lazyList.size());
newElement.put("someProperty", "someValue");
Once you've finished you can get back an Array of the elements of the appropriate type:
// Retrieve the array from the list
TreeMap[] myArray = (TreeMap[])lazyList.toArray());
Alternatively you can create an empty List and specify the Class for List's elements. The LazyDynaList uses the Class to automatically populate elements:
// e.g. For Maps
List lazyList = new LazyDynaList(TreeMap.class);
// e.g. For POJO Beans
List lazyList = new LazyDynaList(MyPojo.class);
// e.g. For DynaBeans
List lazyList = new LazyDynaList(MyDynaBean.class);
Alternatively you can create an empty List and specify the DynaClass for List's elements. The LazyDynaList uses the DynaClass to automatically populate elements:
// e.g. For Maps
DynaClass dynaClass = new LazyDynaMap(new HashMap());
List lazyList = new LazyDynaList(dynaClass);
// e.g. For POJO Beans
DynaClass dynaClass = (new WrapDynaBean(myPojo)).getDynaClass();
List lazyList = new LazyDynaList(dynaClass);
// e.g. For DynaBeans
DynaClass dynaClass = new BasicDynaClass(properties);
List lazyList = new LazyDynaList(dynaClass);
N.B. You may wonder why control the type
using a DynaClass rather than the Class
as in the previous example - the reason is that some DynaBean
implementations don't have a default empty constructor and
therefore need to be instantiated using the DynaClass.newInstance()
method.
A slight variation - set the element type using either
the setElementType(Class) method or the
setElementDynaClass(DynaClass) method - then populate
with the normal java.util.List methods(i.e.
add(), addAll() or set()).
// Create a new LazyDynaList (100 element capacity)
LazyDynaList lazyList = new LazyDynaList(100);
// Either Set the element type...
lazyList.setElementType(TreeMap.class);
// ...or the element DynaClass...
lazyList.setElementDynaClass(new MyCustomDynaClass());
// Populate from a collection
lazyList.addAll(myCollection);
modCount| Constructor and Description |
|---|
LazyDynaList()
Default Constructor.
|
LazyDynaList(Class<?> elementType)
Construct a LazyDynaList with a
specified type for its elements.
|
LazyDynaList(Collection<?> collection)
Construct a LazyDynaList populated with the
elements of a Collection.
|
LazyDynaList(DynaClass elementDynaClass)
Construct a LazyDynaList with a
specified DynaClass for its elements.
|
LazyDynaList(int capacity)
Construct a LazyDynaList with the
specified capacity.
|
LazyDynaList(Object[] array)
Construct a LazyDynaList populated with the
elements of an Array.
|
| Modifier and Type | Method and Description |
|---|---|
void |
add(int index,
Object element)
Insert an element at the specified index position.
|
boolean |
add(Object element)
Add an element to the List.
|
boolean |
addAll(Collection<?> collection)
Add all the elements from a Collection to the list.
|
boolean |
addAll(int index,
Collection<?> collection)
Insert all the elements from a Collection into the
list at a specified position.
|
Object |
get(int index)
Return the element at the specified position.
|
Object |
set(int index,
Object element)
Set the element at the specified position.
|
void |
setElementDynaClass(DynaClass elementDynaClass)
Set the element Type and DynaClass.
|
void |
setElementType(Class<?> elementType)
Set the element Type and DynaClass.
|
Object[] |
toArray()
Converts the List to an Array.
|
<T> T[] |
toArray(T[] model)
Converts the List to an Array of the specified type.
|
DynaBean[] |
toDynaBeanArray()
Converts the List to an DynaBean Array.
|
clear, clone, contains, ensureCapacity, forEach, indexOf, isEmpty, iterator, lastIndexOf, listIterator, listIterator, remove, remove, removeAll, removeIf, removeRange, replaceAll, retainAll, size, sort, spliterator, subList, trimToSizeequals, hashCodecontainsAll, toStringfinalize, getClass, notify, notifyAll, wait, wait, waitcontainsAll, equals, hashCodeparallelStream, streampublic LazyDynaList()
public LazyDynaList(int capacity)
capacity - The initial capacity of the list.public LazyDynaList(DynaClass elementDynaClass)
elementDynaClass - The DynaClass of the List's elements.public LazyDynaList(Class<?> elementType)
elementType - The Type of the List's elements.public LazyDynaList(Collection<?> collection)
collection - The Collection to populate the List from.public LazyDynaList(Object[] array)
array - The Array to populate the List from.public void add(int index, Object element)
Insert an element at the specified index position.
If the index position is greater than the current size of the List, then the List is automatically grown to the appropriate size.
public boolean addAll(Collection<?> collection)
Add all the elements from a Collection to the list.
public boolean addAll(int index, Collection<?> collection)
Insert all the elements from a Collection into the list at a specified position.
If the index position is greater than the current size of the List, then the List is automatically grown to the appropriate size.
public Object get(int index)
Return the element at the specified position.
If the position requested is greater than the current size of the List, then the List is automatically grown (and populated) to the appropriate size.
public Object set(int index, Object element)
Set the element at the specified position.
If the position requested is greater than the current size of the List, then the List is automatically grown (and populated) to the appropriate size.
public Object[] toArray()
Converts the List to an Array.
The type of Array created depends on the contents of the List:
public <T> T[] toArray(T[] model)
Converts the List to an Array of the specified type.
toArray in interface Collection<Object>toArray in interface List<Object>toArray in class ArrayList<Object>T - The type of the array elementsmodel - The model for the type of array to returnpublic DynaBean[] toDynaBeanArray()
Converts the List to an DynaBean Array.
public void setElementType(Class<?> elementType)
Set the element Type and DynaClass.
elementType - The type of the elements.IllegalArgumentException - if the List already
contains elements or the DynaClass is null.public void setElementDynaClass(DynaClass elementDynaClass)
Set the element Type and DynaClass.
elementDynaClass - The DynaClass of the elements.IllegalArgumentException - if the List already
contains elements or the DynaClass is null.Copyright © 2000–2019 The Apache Software Foundation. All rights reserved.