javolution.util.FastTable Maven / Gradle / Ivy
/*
* Javolution - Java(TM) Solution for Real-Time and Embedded Systems
* Copyright (C) 2012 - Javolution (http://javolution.org/)
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software is
* freely granted, provided that this notice is preserved.
*/
package javolution.util;
import static javolution.lang.Realtime.Limit.CONSTANT;
import static javolution.lang.Realtime.Limit.LINEAR;
import static javolution.lang.Realtime.Limit.LOG_N;
import static javolution.lang.Realtime.Limit.N_LOG_N;
import static javolution.lang.Realtime.Limit.N_SQUARE;
import java.util.Collection;
import java.util.Deque;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.RandomAccess;
import javolution.lang.Realtime;
import javolution.util.function.Consumer;
import javolution.util.function.Equalities;
import javolution.util.function.Equality;
import javolution.util.function.Function;
import javolution.util.internal.table.AtomicTableImpl;
import javolution.util.internal.table.FastTableImpl;
import javolution.util.internal.table.MappedTableImpl;
import javolution.util.internal.table.QuickSort;
import javolution.util.internal.table.ReversedTableImpl;
import javolution.util.internal.table.SharedTableImpl;
import javolution.util.internal.table.SubTableImpl;
import javolution.util.internal.table.UnmodifiableTableImpl;
import javolution.util.service.TableService;
/**
* A high-performance table (fractal-based) with {@link Realtime real-time}
* behavior.
*
* The fractal-based implementation ensures that add/insertion/deletion operations
* worst execution time is always in less than O(log(size)).
* For comparison {@code ArrayList.add} is in O(size) due to resize.
*
*
* 
*
*
* Instances of this class can advantageously replace {@link java.util.ArrayList ArrayList},
* {@link java.util.LinkedList LinkedList} or {@link java.util.ArrayDeque ArrayDeque}
* in terms of adaptability, space or performance.
* Fast tables can be concurrently iterated / modified using their {@link #shared() shared}/{@link #atomic() atomic}
* views. They inherit all the fast collection views and support the {@link #subTable subTable} view over a portion of the table.
* [code]
* FastTable names = FastTable.of("John Deuff", "Otto Graf", "Sim Kamil");
* names.sort(Equalities.LEXICAL_CASE_INSENSITIVE); // Sorts the names in place (different from sorted() which returns a sorted view).
* names.subTable(0, names.size() / 2).clear(); // Removes the first half of the table (see java.util.List.subList specification).
* names.filtered(str -> str.startsWith("A")).clear(); // Removes all the names starting with "A" (Java 8 notation).
* names.filtered(str -> str.startsWith("A")).parallel().clear(); // Same as above but performed concurrently.
* [/code]
*
* As for any {@link FastCollection fast collection}, iterations can be
* performed using closures.
* [code]
* FastTable persons = ...;
* Person findWithName(final String name) {
* return persons.filtered(new Predicate() {
* public boolean test(Person person) {
* return (person.getName().equals(name));
* }
* }).any(Person.class);
* }[/code]
*
* The notation is shorter with Java 8.
* [code]
* Person findWithName(String name) {
* return persons.filtered(person -> person.getName().equals(name)).any(Person.class);
* }[/code]
*
* FastTable iteration order is the {@link #add insertion} order; specialization may
* have a different order, for example the iteration order of {@link FastSortedTable}
* is based on the table sorting order.
*
* @author Jean-Marie Dautelle
* @version 6.0, July 21, 2013
*/
public class FastTable extends FastCollection implements List,
Deque, RandomAccess {
private static final long serialVersionUID = 0x600L; // Version.
/**
* Holds the actual service implementation.
*/
private final TableService service;
/**
* Returns a new table holding the same elements as the specified
* array (convenience method).
*/
public static FastTable of(E... elements) {
FastTable table = new FastTable();
for (E e : elements) table.add(e);
return table;
}
/**
* Returns a new table holding the same elements as the specified
* collection (convenience method).
*/
public static FastTable of(Collection that) {
FastTable table = new FastTable();
table.addAll(that);
return table;
}
/**
* Creates an empty table whose capacity increments/decrements smoothly
* without large resize operations to best fit the table current size.
*/
public FastTable() {
this(Equalities.STANDARD);
}
/**
* Creates an empty table using the specified comparator for element
* equality.
*/
public FastTable(Equality comparator) {
service = new FastTableImpl(comparator);
}
/**
* Creates a fast table backed up by the specified service implementation.
*/
protected FastTable(TableService service) {
this.service = service;
}
////////////////////////////////////////////////////////////////////////////
// Views.
//
@Override
public FastTable atomic() {
return new FastTable(new AtomicTableImpl(service));
}
@Override
public FastTable reversed() {
return new FastTable(new ReversedTableImpl(service));
}
@Override
public FastTable shared() {
return new FastTable(new SharedTableImpl(service));
}
@Override
public FastTable unmodifiable() {
return new FastTable(new UnmodifiableTableImpl(service));
}
@Override
public FastTable mapped(
Function function) {
return new FastTable(new MappedTableImpl(service(), function));
}
/**
* Returns a view over a portion of the table (equivalent to
* {@link java.util.List#subList(int, int)}).
*/
public FastTable subTable(int fromIndex, int toIndex) {
return new FastTable(
new SubTableImpl(service, fromIndex, toIndex));
}
////////////////////////////////////////////////////////////////////////////
// Change in time limit behavior.
//
@Override
@Realtime(limit = CONSTANT)
public boolean isEmpty() {
return service.isEmpty();
}
@Override
@Realtime(limit = CONSTANT)
public int size() {
return service.size();
}
@Override
@Realtime(limit = CONSTANT)
public void clear() {
service.clear();
}
////////////////////////////////////////////////////////////////////////////
// List Interface.
//
/** Inserts the specified element at the specified position in this table. */
@Override
@Realtime(limit = LOG_N)
public void add(int index, E element) {
service.add(index, element);
}
/** Inserts all of the elements in the specified collection into this table
* at the specified position. */
@Override
@Realtime(limit = N_LOG_N)
public boolean addAll(final int index, Collection elements) {
return service.addAll(index, elements);
}
/** Removes the element at the specified position in this table. */
@Override
@Realtime(limit = LOG_N)
public E remove(int index) {
return service.remove(index);
}
/** Returns the element at the specified position in this table. */
@Override
@Realtime(limit = CONSTANT)
public E get(int index) {
return service.get(index);
}
/** Replaces the element at the specified position in this table with the specified element. */
@Override
@Realtime(limit = CONSTANT)
public E set(int index, E element) {
return service.set(index, element);
}
/** Returns the index of the first occurrence of the specified element in this table,
* or -1 if this table does not contain the element. */
@Override
@Realtime(limit = LINEAR)
public int indexOf(Object element) {
return service.indexOf(element);
}
/** Returns the index of the last occurrence of the specified element in this table,
* or -1 if this table does not contain the element. */
@Override
@Realtime(limit = LINEAR)
public int lastIndexOf(final Object element) {
return service.lastIndexOf(element);
}
/** Returns a list iterator over the elements in this table. */
@Override
@Realtime(limit = CONSTANT)
public ListIterator listIterator() {
return service.listIterator();
}
/** Returns a list iterator over the elements in this table, starting
* at the specified position in the table. */
@Override
@Realtime(limit = CONSTANT)
public ListIterator listIterator(int index) {
return service.listIterator(index);
}
////////////////////////////////////////////////////////////////////////////
// Deque Interface.
//
/** Inserts the specified element at the front of this table. */
@Override
@Realtime(limit = CONSTANT)
public void addFirst(E element) {
service.addFirst(element);
}
/** Inserts the specified element at the end of this table. */
@Override
@Realtime(limit = CONSTANT)
public void addLast(E element) {
service.addLast(element);
}
/** Retrieves, but does not remove, the first element of this table. */
@Override
@Realtime(limit = CONSTANT)
public E getFirst() {
return service.getFirst();
}
/** Retrieves, but does not remove, the last element of this table. */
@Override
@Realtime(limit = CONSTANT)
public E getLast() {
return service.getLast();
}
/** Retrieves, but does not remove, the first element of this table,
* or returns null if this table is empty. */
@Override
@Realtime(limit = CONSTANT)
public E peekFirst() {
return service.peekFirst();
}
/** Retrieves, but does not remove, the last element of this table,
* or returns null if this table is empty. */
@Override
@Realtime(limit = CONSTANT)
public E peekLast() {
return service.peekLast();
}
/** Retrieves and removes the first element of this table,
* or returns null if this table is empty. */
@Override
@Realtime(limit = CONSTANT)
public E pollFirst() {
return service.pollFirst();
}
/** . */
@Override
@Realtime(limit = CONSTANT)
public E pollLast() {
return service.pollLast();
}
/** Retrieves and removes the last element of this table,
* or returns null if this table is empty. */
@Override
@Realtime(limit = CONSTANT)
public E removeFirst() {
return service.removeFirst();
}
/** Retrieves and removes the last element of this table. */
@Override
@Realtime(limit = CONSTANT)
public E removeLast() {
return service.removeLast();
}
/** Inserts the specified element at the front of this table. */
@Override
@Realtime(limit = CONSTANT)
public boolean offerFirst(E e) {
return service.offerFirst(e);
}
/** Inserts the specified element at the end of this table. */
@Override
@Realtime(limit = CONSTANT)
public boolean offerLast(E e) {
return service.offerLast(e);
}
/** Removes the first occurrence of the specified element from this table. */
@Override
@Realtime(limit = LINEAR)
public boolean removeFirstOccurrence(Object o) {
return service.removeFirstOccurrence(o);
}
/** Removes the last occurrence of the specified element from this table. */
@Override
@Realtime(limit = LINEAR)
public boolean removeLastOccurrence(Object o) {
return service.removeLastOccurrence(o);
}
/** Inserts the specified element into the queue represented by this table. */
@Override
@Realtime(limit = CONSTANT)
public boolean offer(E e) {
return service.offer(e);
}
/** Retrieves and removes the head of the queue represented by this table. */
@Override
@Realtime(limit = CONSTANT)
public E remove() {
return service.remove();
}
/** Retrieves and removes the head of the queue represented by this table. */
@Override
@Realtime(limit = CONSTANT)
public E poll() {
return service.poll();
}
/** Retrieves, but does not remove, the head of the queue represented by this table. */
@Override
@Realtime(limit = CONSTANT)
public E element() {
return service.element();
}
/** Retrieves, but does not remove, the head of the queue represented by this table. */
@Override
@Realtime(limit = CONSTANT)
public E peek() {
return service.peek();
}
/** Pushes an element onto the stack represented by this table. */
@Override
@Realtime(limit = CONSTANT)
public void push(E e) {
service.push(e);
}
/** Pops an element from the stack represented by this table. */
@Override
@Realtime(limit = CONSTANT)
public E pop() {
return service.pop();
}
/** Returns an iterator over the elements in this table in reverse sequential order. */
@Override
@Realtime(limit = CONSTANT)
public Iterator descendingIterator() {
return service.descendingIterator();
}
////////////////////////////////////////////////////////////////////////////
// Misc.
//
/**
* Sorts this table in place (quick sort).
*/
@Realtime(limit = N_SQUARE)
public void sort() {
update(new Consumer>() {
@Override
public void accept(TableService table) {
QuickSort qs = new QuickSort(table, table.comparator());
qs.sort();
}
});
}
/**
* Replaced by {@link #subTable(int, int)}. The term "List" for an
* interface with random access is disturbing !
*/
@Override
@Deprecated
public FastTable subList(int fromIndex, int toIndex) {
return subTable(fromIndex, toIndex);
}
@Override
protected TableService service() {
return service;
}
}