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Library providing immutable/persistent collection classes for
Java. While collections are immutable they provide methods for
adding and removing values by creating new modified copies of
themselves. Each copy shares almost all of its structure with
other copies to minimize memory consumption.
///###////////////////////////////////////////////////////////////////////////
//
// Burton Computer Corporation
// http://www.burton-computer.com
//
// Copyright (c) 2017, Burton Computer Corporation
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
//
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// of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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package org.javimmutable.collections;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import java.util.Iterator;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collector;
/**
* Interface for containers that store items in list form with individual items available
* for get() and assign() using their indexes. Items inserted into the list are always
* added at either the front or the end of the list and indexes of items are always in
* the range 0 through size() - 1.
*/
@Immutable
public interface JImmutableList
extends Insertable>,
Indexed,
Cursorable,
IterableStreamable,
InvariantCheckable
{
interface Builder
extends MutableBuilder>
{
}
/**
* @return number of values in the list
*/
int size();
/**
* Retrieves the value at the specified index (which must be within the bounds
* of the list).
*
* @throws IndexOutOfBoundsException if index is out of bounds
*/
@Override
T get(int index);
/**
* Replaces the value at the specified index (which must be within current
* bounds of the list) with the new value.
*
* @throws IndexOutOfBoundsException if index is out of bounds
*/
@Nonnull
JImmutableList assign(int index,
@Nullable T value);
/**
* Adds a value to the end of the list. May be invoked on an empty list.
*/
@Nonnull
@Override
JImmutableList insert(@Nullable T value);
/**
* Adds the values to the end of the list in the same order they appear in the Iterable. May be invoked on an empty list.
*/
@Nonnull
JImmutableList insert(@Nonnull Iterable values);
/**
* Adds a value to the front of the list. May be invoked on an empty list.
* Synonym for insert()
*/
@Nonnull
JImmutableList insertFirst(@Nullable T value);
/**
* Adds a value to the end of the list. May be invoked on an empty list.
* Synonym for insert().
*/
@Nonnull
JImmutableList insertLast(@Nullable T value);
/**
* Adds the values to the end of the list in the same order they appear in the Iterable. May be invoked on an empty list.
*
* @return instance of list containing the collection
*/
@Nonnull
@Override
JImmutableList insertAll(@Nonnull Iterable values);
/**
* Adds the values to the end of the list in the same order they appear in the Iterable. May be invoked on an empty list.
*
* @return instance of list containing the collection
*/
@Nonnull
@Override
JImmutableList insertAll(@Nonnull Cursor values);
/**
* Adds the values to the end of the list in the same order they appear in the Iterable. May be invoked on an empty list.
*
* @return instance of list containing the collection
*/
@Nonnull
@Override
JImmutableList insertAll(@Nonnull Iterator values);
/**
* Adds the values to the beginning of the list in the same order they appear in the Iterable. May be invoked on an empty list.
*
* @return instance of list containing the collection
*/
@Nonnull
JImmutableList insertAllFirst(@Nonnull Iterable values);
/**
* Adds the values to the beginning of the list in the same order they appear in the Iterable. May be invoked on an empty list.
*
* @return instance of list containing the collection
*/
@Nonnull
JImmutableList insertAllFirst(@Nonnull Cursor values);
/**
* Adds the values to the beginning of the list in the same order they appear in the Iterable. May be invoked on an empty list.
*
* @return instance of list containing the collection
*/
@Nonnull
JImmutableList insertAllFirst(@Nonnull Iterator values);
/**
* Adds the values to the end of the list in the same order they appear in the Iterable. May be invoked on an empty list.
* Synonym for insertAll()
*
* @return instance of list containing the collection
*/
@Nonnull
JImmutableList insertAllLast(@Nonnull Iterable values);
/**
* Adds the values to the end of the list in the same order they appear in the Iterable. May be invoked on an empty list.
* Synonym for insertAll()
*
* @return instance of list containing the collection
*/
@Nonnull
JImmutableList insertAllLast(@Nonnull Cursor values);
/**
* Adds the values to the end of the list in the same order they appear in the Iterable. May be invoked on an empty list.
* Synonym for insertAll()
*
* @return instance of list containing the collection
*/
@Nonnull
JImmutableList insertAllLast(@Nonnull Iterator values);
/**
* Removes the first value from the list and reduces size by 1. size() must be greater than zero
*
* @return new JImmutableList without last value
* @throws IndexOutOfBoundsException if list is already empty
*/
@Nonnull
JImmutableList deleteFirst();
/**
* Removes the last value from the list and reduces size by 1. size() must be greater than zero
*
* @return new JImmutableList without last value
* @throws IndexOutOfBoundsException if list is already empty
*/
@Nonnull
JImmutableList deleteLast();
/**
* @return true only if list contains no values
*/
boolean isEmpty();
/**
* @return an equivalent collection with no values
*/
@Nonnull
JImmutableList deleteAll();
/**
* Returns an unmodifiable List implementation backed by this list.
*/
@Nonnull
List getList();
/**
* Returns a list of the same type as this containing only those elements for which
* predicate returns true. Implementations are optimized assuming predicate will
* return false more often than true.
*
* @param predicate decides whether to include an element
* @return list of same type as this containing only those elements for which predicate returns true
*/
@Nonnull
default JImmutableList select(@Nonnull Predicate predicate)
{
JImmutableList answer = deleteAll();
for (T value : this) {
if (predicate.test(value)) {
answer = answer.insert(value);
}
}
return answer.size() == size() ? this : answer;
}
/**
* Returns a list of the same type as this containing all those elements for which
* predicate returns false. Implementations can be optimized assuming predicate will
* return false more often than true.
*
* @param predicate decides whether to include an element
* @return list of same type as this containing only those elements for which predicate returns false
*/
@Nonnull
default JImmutableList reject(@Nonnull Predicate predicate)
{
return select(predicate.negate());
}
/**
* Returns a Collector that creates a list of the same type as this containing all
* of the collected values inserted after whatever starting values this already contained.
*/
@Nonnull
default Collector> listCollector()
{
return GenericCollector.ordered(this, deleteAll(), a -> a.isEmpty(), (a, v) -> a.insert(v), (a, b) -> a.insertAll(b));
}
}