Class AbstractEventList<E>
- java.lang.Object
-
- ca.odell.glazedlists.AbstractEventList<E>
-
- All Implemented Interfaces:
EventList<E>
,java.lang.Iterable<E>
,java.util.Collection<E>
,java.util.List<E>
- Direct Known Subclasses:
BasicEventList
,DebugList
,TransformedList
public abstract class AbstractEventList<E> extends java.lang.Object implements EventList<E>
A convenience class that implements common functionality for allEventList
s.If you are creating a custom
EventList
, consider extending the more feature-richTransformedList
.Documentation Note: Javadoc tags have been copied from the
List
API because thejavadoc
tool does not inherit external descriptions.- Author:
- Jesse Wilson
-
-
Field Summary
Fields Modifier and Type Field Description protected ListEventPublisher
publisher
the publisher manages the distribution of changesprotected ReadWriteLock
readWriteLock
the read/write lock provides mutual exclusion to accessprotected ListEventAssembler<E>
updates
the change event and notification system
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Constructor Summary
Constructors Modifier Constructor Description protected
AbstractEventList()
Create anAbstractEventList
that sends events with the defaultListEventPublisher
.protected
AbstractEventList(ListEventPublisher publisher)
Creates anAbstractEventList
that sends events using the specifiedListEventPublisher
.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description void
add(int index, E value)
Inserts the specified element at the specified position in this list (optional operation).boolean
add(E value)
Appends the specified element to the end of this list (optional operation).boolean
addAll(int index, java.util.Collection<? extends E> values)
Inserts all of the elements in the specified collection into this list at the specified position (optional operation).boolean
addAll(java.util.Collection<? extends E> values)
Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection's iterator (optional operation).void
addListEventListener(ListEventListener<? super E> listChangeListener)
Registers the specified listener to receive change updates for this list.void
clear()
Removes all of the elements from this list (optional operation).boolean
contains(java.lang.Object object)
Returns true if this list contains the specified element.boolean
containsAll(java.util.Collection<?> values)
Returns true if this list contains all of the elements of the specified collection.boolean
equals(java.lang.Object object)
Compares the specified object with this list for equality.abstract E
get(int index)
Returns the element at the specified position in this list.ListEventPublisher
getPublisher()
Get the publisher used to distributeListEvent
s.ReadWriteLock
getReadWriteLock()
Gets the lock required to share this list between multiple threads.int
hashCode()
Returns the hash code value for this list.int
indexOf(java.lang.Object object)
Returns the index in this list of the first occurrence of the specified element, or -1 if this list does not contain this element.boolean
isEmpty()
Returns true if this list contains no elements.java.util.Iterator<E>
iterator()
Returns an iterator over the elements in this list in proper sequence.int
lastIndexOf(java.lang.Object object)
Returns the index in this list of the last occurrence of the specified element, or -1 if this list does not contain this element.java.util.ListIterator<E>
listIterator()
Returns a list iterator of the elements in this list (in proper sequence).java.util.ListIterator<E>
listIterator(int index)
Returns a list iterator of the elements in this list (in proper sequence), starting at the specified position in this list.E
remove(int index)
Removes the element at the specified position in this list (optional operation).boolean
remove(java.lang.Object toRemove)
Removes the first occurrence in this list of the specified element (optional operation).boolean
removeAll(java.util.Collection<?> values)
Removes from this list all the elements that are contained in the specified collection (optional operation).void
removeListEventListener(ListEventListener<? super E> listChangeListener)
Removes the specified listener from receiving change updates for this list.boolean
retainAll(java.util.Collection<?> values)
Retains only the elements in this list that are contained in the specified collection (optional operation).E
set(int index, E value)
Replaces the element at the specified position in this list with the specified element (optional operation).abstract int
size()
Returns the number of elements in this list.java.util.List<E>
subList(int fromIndex, int toIndex)
Returns a view of the portion of this list between the specified fromIndex, inclusive, and toIndex, exclusive.java.lang.Object[]
toArray()
Returns an array containing all of the elements in this list in proper sequence.<T> T[]
toArray(T[] array)
Returns an array containing all of the elements in this list in proper sequence; the runtime type of the returned array is that of the specified array.java.lang.String
toString()
Returns a string representation of this collection.
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Field Detail
-
updates
protected ListEventAssembler<E> updates
the change event and notification system
-
readWriteLock
protected ReadWriteLock readWriteLock
the read/write lock provides mutual exclusion to access
-
publisher
protected ListEventPublisher publisher
the publisher manages the distribution of changes
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Constructor Detail
-
AbstractEventList
protected AbstractEventList(ListEventPublisher publisher)
Creates anAbstractEventList
that sends events using the specifiedListEventPublisher
.- Parameters:
publisher
- the channel for event distribution. If this is null, then a newListEventPublisher
will be created.
-
AbstractEventList
protected AbstractEventList()
Create anAbstractEventList
that sends events with the defaultListEventPublisher
.
-
-
Method Detail
-
getPublisher
public ListEventPublisher getPublisher()
Get the publisher used to distributeListEvent
s. It's always defined.- Specified by:
getPublisher
in interfaceEventList<E>
-
getReadWriteLock
public ReadWriteLock getReadWriteLock()
Gets the lock required to share this list between multiple threads. It's always defined.- Specified by:
getReadWriteLock
in interfaceEventList<E>
- Returns:
- a re-entrant
ReadWriteLock
that guarantees thread safe access to this list.
-
addListEventListener
public void addListEventListener(ListEventListener<? super E> listChangeListener)
Registers the specified listener to receive change updates for this list.- Specified by:
addListEventListener
in interfaceEventList<E>
- Parameters:
listChangeListener
- event listener != null
-
removeListEventListener
public void removeListEventListener(ListEventListener<? super E> listChangeListener)
Removes the specified listener from receiving change updates for this list.- Specified by:
removeListEventListener
in interfaceEventList<E>
- Parameters:
listChangeListener
- event listener != null
-
size
public abstract int size()
Returns the number of elements in this list. If this list contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.
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isEmpty
public boolean isEmpty()
Returns true if this list contains no elements.
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contains
public boolean contains(java.lang.Object object)
Returns true if this list contains the specified element. More formally, returns true if and only if this list contains at least one element e such that (o==null ? e==null : o.equals(e)).- Specified by:
contains
in interfacejava.util.Collection<E>
- Specified by:
contains
in interfacejava.util.List<E>
- Parameters:
object
- element whose presence in this list is to be tested.- Returns:
- true if this list contains the specified element.
- Throws:
java.lang.ClassCastException
- if the type of the specified element is incompatible with this list (optional).java.lang.NullPointerException
- if the specified element is null and this list does not support null elements (optional).
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iterator
public java.util.Iterator<E> iterator()
Returns an iterator over the elements in this list in proper sequence.The returned
Iterator
will become inconsistent if theEventList
that it views is modified. To overcome this problem, uselistIterator()
. When used concurrently, the returnedIterator
requires locking via this list'sReadWriteLock
.
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toArray
public java.lang.Object[] toArray()
Returns an array containing all of the elements in this list in proper sequence. Obeys the general contract of the Collection.toArray method.
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toArray
public <T> T[] toArray(T[] array)
Returns an array containing all of the elements in this list in proper sequence; the runtime type of the returned array is that of the specified array. Obeys the general contract of the Collection.toArray(Object[]) method.- Specified by:
toArray
in interfacejava.util.Collection<E>
- Specified by:
toArray
in interfacejava.util.List<E>
- Parameters:
array
- the array into which the elements of this list are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.- Returns:
- an array containing the elements of this list.
- Throws:
java.lang.ArrayStoreException
- if the runtime type of the specified array is not a supertype of the runtime type of every element in this list.java.lang.NullPointerException
- if the specified array is null.
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add
public boolean add(E value)
Appends the specified element to the end of this list (optional operation).Lists that support this operation may place limitations on what elements may be added to this list. In particular, some lists will refuse to add null elements, and others will impose restrictions on the type of elements that may be added. List classes should clearly specify in their documentation any restrictions on what elements may be added.
- Specified by:
add
in interfacejava.util.Collection<E>
- Specified by:
add
in interfacejava.util.List<E>
- Parameters:
value
- element to be appended to this list.- Returns:
- true (as per the general contract of the Collection.add method).
- Throws:
java.lang.UnsupportedOperationException
- if the add method is not supported by this list.java.lang.ClassCastException
- if the class of the specified element prevents it from being added to this list.java.lang.NullPointerException
- if the specified element is null and this list does not support null elements.java.lang.IllegalArgumentException
- if some aspect of this element prevents it from being added to this list.
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remove
public boolean remove(java.lang.Object toRemove)
Removes the first occurrence in this list of the specified element (optional operation). If this list does not contain the element, it is unchanged. More formally, removes the element with the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))) (if such an element exists).- Specified by:
remove
in interfacejava.util.Collection<E>
- Specified by:
remove
in interfacejava.util.List<E>
- Parameters:
toRemove
- element to be removed from this list, if present.- Returns:
- true if this list contained the specified element.
- Throws:
java.lang.ClassCastException
- if the type of the specified element is incompatible with this list (optional).java.lang.NullPointerException
- if the specified element is null and this list does not support null elements (optional).java.lang.UnsupportedOperationException
- if the remove method is not supported by this list.
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containsAll
public boolean containsAll(java.util.Collection<?> values)
Returns true if this list contains all of the elements of the specified collection.- Specified by:
containsAll
in interfacejava.util.Collection<E>
- Specified by:
containsAll
in interfacejava.util.List<E>
- Parameters:
values
- collection to be checked for containment in this list.- Returns:
- true if this list contains all of the elements of the specified collection.
- Throws:
java.lang.ClassCastException
- if the types of one or more elements in the specified collection are incompatible with this list (optional).java.lang.NullPointerException
- if the specified collection contains one or more null elements and this list does not support null elements (optional).java.lang.NullPointerException
- if the specified collection is null.- See Also:
contains(Object)
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addAll
public boolean addAll(java.util.Collection<? extends E> values)
Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection's iterator (optional operation). The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress. (Note that this will occur if the specified collection is this list, and it's nonempty.)- Specified by:
addAll
in interfacejava.util.Collection<E>
- Specified by:
addAll
in interfacejava.util.List<E>
- Parameters:
values
- collection whose elements are to be added to this list.- Returns:
- true if this list changed as a result of the call.
- Throws:
java.lang.UnsupportedOperationException
- if the addAll method is not supported by this list.java.lang.ClassCastException
- if the class of an element in the specified collection prevents it from being added to this list.java.lang.NullPointerException
- if the specified collection contains one or more null elements and this list does not support null elements, or if the specified collection is null.java.lang.IllegalArgumentException
- if some aspect of an element in the specified collection prevents it from being added to this list.- See Also:
add(Object)
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addAll
public boolean addAll(int index, java.util.Collection<? extends E> values)
Inserts all of the elements in the specified collection into this list at the specified position (optional operation). Shifts the element currently at that position (if any) and any subsequent elements to the right (increases their indices). The new elements will appear in this list in the order that they are returned by the specified collection's iterator. The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress. (Note that this will occur if the specified collection is this list, and it's nonempty.)- Specified by:
addAll
in interfacejava.util.List<E>
- Parameters:
index
- index at which to insert first element from the specified collection.values
- elements to be inserted into this list.- Returns:
- true if this list changed as a result of the call.
- Throws:
java.lang.UnsupportedOperationException
- if the addAll method is not supported by this list.java.lang.ClassCastException
- if the class of one of elements of the specified collection prevents it from being added to this list.java.lang.NullPointerException
- if the specified collection contains one or more null elements and this list does not support null elements, or if the specified collection is null.java.lang.IllegalArgumentException
- if some aspect of one of elements of the specified collection prevents it from being added to this list.java.lang.IndexOutOfBoundsException
- if the index is out of range (index < 0 || index > size()).
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removeAll
public boolean removeAll(java.util.Collection<?> values)
Removes from this list all the elements that are contained in the specified collection (optional operation).- Specified by:
removeAll
in interfacejava.util.Collection<E>
- Specified by:
removeAll
in interfacejava.util.List<E>
- Parameters:
values
- collection that defines which elements will be removed from this list.- Returns:
- true if this list changed as a result of the call.
- Throws:
java.lang.UnsupportedOperationException
- if the removeAll method is not supported by this list.java.lang.ClassCastException
- if the types of one or more elements in this list are incompatible with the specified collection (optional).java.lang.NullPointerException
- if this list contains one or more null elements and the specified collection does not support null elements (optional).java.lang.NullPointerException
- if the specified collection is null.- See Also:
remove(Object)
,contains(Object)
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retainAll
public boolean retainAll(java.util.Collection<?> values)
Retains only the elements in this list that are contained in the specified collection (optional operation). In other words, removes from this list all the elements that are not contained in the specified collection.- Specified by:
retainAll
in interfacejava.util.Collection<E>
- Specified by:
retainAll
in interfacejava.util.List<E>
- Parameters:
values
- collection that defines which elements this set will retain.- Returns:
- true if this list changed as a result of the call.
- Throws:
java.lang.UnsupportedOperationException
- if the retainAll method is not supported by this list.java.lang.ClassCastException
- if the types of one or more elements in this list are incompatible with the specified collection (optional).java.lang.NullPointerException
- if this list contains one or more null elements and the specified collection does not support null elements (optional).java.lang.NullPointerException
- if the specified collection is null.- See Also:
remove(Object)
,contains(Object)
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clear
public void clear()
Removes all of the elements from this list (optional operation). This list will be empty after this call returns (unless it throws an exception).
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equals
public boolean equals(java.lang.Object object)
Compares the specified object with this list for equality. Returns true if and only if the specified object is also a list, both lists have the same size, and all corresponding pairs of elements in the two lists are equal. (Two elements e1 and e2 are equal if (e1==null ? e2==null : e1.equals(e2)).) In other words, two lists are defined to be equal if they contain the same elements in the same order. This definition ensures that the equals method works properly across different implementations of the List interface.
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hashCode
public int hashCode()
Returns the hash code value for this list. The hash code of a list is defined to be the result of the following calculation:hashCode = 1; Iterator i = list.iterator(); while (i.hasNext()) { Object obj = i.next(); hashCode = 31*hashCode + (obj==null ? 0 : obj.hashCode()); }
This ensures that list1.equals(list2) implies that list1.hashCode()==list2.hashCode() for any two lists, list1 and list2, as required by the general contract of Object.hashCode.- Specified by:
hashCode
in interfacejava.util.Collection<E>
- Specified by:
hashCode
in interfacejava.util.List<E>
- Overrides:
hashCode
in classjava.lang.Object
- Returns:
- the hash code value for this list.
- See Also:
Object.hashCode()
,Object.equals(Object)
,equals(Object)
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get
public abstract E get(int index)
Returns the element at the specified position in this list.- Specified by:
get
in interfacejava.util.List<E>
- Parameters:
index
- index of element to return.- Returns:
- the element at the specified position in this list.
- Throws:
java.lang.IndexOutOfBoundsException
- if the index is out of range (index < 0 || index >= size()).
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set
public E set(int index, E value)
Replaces the element at the specified position in this list with the specified element (optional operation).- Specified by:
set
in interfacejava.util.List<E>
- Parameters:
index
- index of element to replace.value
- element to be stored at the specified position.- Returns:
- the element previously at the specified position.
- Throws:
java.lang.UnsupportedOperationException
- if the set method is not supported by this list.java.lang.ClassCastException
- if the class of the specified element prevents it from being added to this list.java.lang.NullPointerException
- if the specified element is null and this list does not support null elements.java.lang.IllegalArgumentException
- if some aspect of the specified element prevents it from being added to this list.java.lang.IndexOutOfBoundsException
- if the index is out of range (index < 0 || index >= size()).
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add
public void add(int index, E value)
Inserts the specified element at the specified position in this list (optional operation). Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).- Specified by:
add
in interfacejava.util.List<E>
- Parameters:
index
- index at which the specified element is to be inserted.value
- element to be inserted.- Throws:
java.lang.UnsupportedOperationException
- if the add method is not supported by this list.java.lang.ClassCastException
- if the class of the specified element prevents it from being added to this list.java.lang.NullPointerException
- if the specified element is null and this list does not support null elements.java.lang.IllegalArgumentException
- if some aspect of the specified element prevents it from being added to this list.java.lang.IndexOutOfBoundsException
- if the index is out of range (index < 0 || index > size()).
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remove
public E remove(int index)
Removes the element at the specified position in this list (optional operation). Shifts any subsequent elements to the left (subtracts one from their indices). Returns the element that was removed from the list.- Specified by:
remove
in interfacejava.util.List<E>
- Parameters:
index
- the index of the element to removed.- Returns:
- the element previously at the specified position.
- Throws:
java.lang.UnsupportedOperationException
- if the remove method is not supported by this list.java.lang.IndexOutOfBoundsException
- if the index is out of range (index < 0 || index >= size()).
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indexOf
public int indexOf(java.lang.Object object)
Returns the index in this list of the first occurrence of the specified element, or -1 if this list does not contain this element. More formally, returns the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.- Specified by:
indexOf
in interfacejava.util.List<E>
- Parameters:
object
- element to search for.- Returns:
- the index in this list of the first occurrence of the specified element, or -1 if this list does not contain this element.
- Throws:
java.lang.ClassCastException
- if the type of the specified element is incompatible with this list (optional).java.lang.NullPointerException
- if the specified element is null and this list does not support null elements (optional).
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lastIndexOf
public int lastIndexOf(java.lang.Object object)
Returns the index in this list of the last occurrence of the specified element, or -1 if this list does not contain this element. More formally, returns the highest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.- Specified by:
lastIndexOf
in interfacejava.util.List<E>
- Parameters:
object
- element to search for.- Returns:
- the index in this list of the last occurrence of the specified element, or -1 if this list does not contain this element.
- Throws:
java.lang.ClassCastException
- if the type of the specified element is incompatible with this list (optional).java.lang.NullPointerException
- if the specified element is null and this list does not support null elements (optional).
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listIterator
public java.util.ListIterator<E> listIterator()
Returns a list iterator of the elements in this list (in proper sequence).Unlike the
ListIterator
from a regularList
, theEventList
'sListIterator
will remain consistent even if theEventList
is changed externally. Note that when used concurrently, the returnedListIterator
requires locking via this list'sReadWriteLock
.- Specified by:
listIterator
in interfacejava.util.List<E>
- Returns:
- a list iterator of the elements in this list (in proper sequence).
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listIterator
public java.util.ListIterator<E> listIterator(int index)
Returns a list iterator of the elements in this list (in proper sequence), starting at the specified position in this list. The specified index indicates the first element that would be returned by an initial call to the next method. An initial call to the previous method would return the element with the specified index minus one.Unlike the
ListIterator
from a regularList
, theEventList
'sListIterator
will remain consistent even if theEventList
is changed externally. Note that when used concurrently, the returnedListIterator
requires locking via this list'sReadWriteLock
.- Specified by:
listIterator
in interfacejava.util.List<E>
- Parameters:
index
- index of first element to be returned from the list iterator (by a call to the next method).- Returns:
- a list iterator of the elements in this list (in proper sequence), starting at the specified position in this list.
- Throws:
java.lang.IndexOutOfBoundsException
- if the index is out of range (index < 0 || index > size()).
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subList
public java.util.List<E> subList(int fromIndex, int toIndex)
Returns a view of the portion of this list between the specified fromIndex, inclusive, and toIndex, exclusive. (If fromIndex and toIndex are equal, the returned list is empty.)Unlike the standard
List.subList()
method, theList
returned by this method will continue to be consistent even if theEventList
it views is modified, structurally or otherwise. The returnedList
can always be safely cast toEventList
. Note that when used concurrently, the returnedList
requires locking via this list'sReadWriteLock
.This method eliminates the need for explicit range operations (of the sort that commonly exist for arrays). Any operation that expects a list can be used as a range operation by passing a subList view instead of a whole list. For example, the following idiom removes a range of elements from a list:
list.subList(from, to).clear();
Similar idioms may be constructed for indexOf and lastIndexOf, and all of the algorithms in the Collections class can be applied to a subList.- Specified by:
subList
in interfacejava.util.List<E>
- Parameters:
fromIndex
- low endpoint (inclusive) of the subList.toIndex
- high endpoint (exclusive) of the subList.- Returns:
- a view of the specified range within this list.
- Throws:
java.lang.IndexOutOfBoundsException
- for an illegal endpoint index value (fromIndex < 0 || toIndex > size || fromIndex > toIndex).
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toString
public java.lang.String toString()
Returns a string representation of this collection. The string representation consists of a list of the collection's elements in the order they are returned by its iterator, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (comma and space). Elements are converted to strings as by String.valueOf(Object).This implementation creates an empty string buffer, appends a left square bracket, and iterates over the collection appending the string representation of each element in turn. After appending each element except the last, the string ", " is appended. Finally a right bracket is appended. A string is obtained from the string buffer, and returned.
- Overrides:
toString
in classjava.lang.Object
- Returns:
- a string representation of this collection.
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