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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.

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// Burton Computer Corporation
// http://www.burton-computer.com
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// Copyright (c) 2014, Burton Computer Corporation
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package org.javimmutable.collections;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;

/**
 * Extension of PersistentList that allows insertion and deletion at arbitrary
 * indexes within the list.
 *
 * @param 
 */
@Immutable
public interface JImmutableRandomAccessList
        extends JImmutableList
{
    /**
     * Replaces the value at the specified index (which must be within current
     * bounds of the list) with the new value.
     *
     * @param index
     * @param value
     * @return
     * @throws IndexOutOfBoundsException if index is out of bounds
     */
    @Nonnull
    JImmutableRandomAccessList assign(int index,
                                         @Nullable T value);

    /**
     * Adds a value to the end of the list.  May be invoked on an empty list.
     *
     * @param value
     * @return
     */
    @Nonnull
    JImmutableRandomAccessList insert(@Nullable T value);

    /**
     * Insert value at index (which must be within 0 to size).
     * Shifts all values at and after index one position to the right and adds 1
     * to size of the list.
     *
     * @param index
     * @param value
     * @return
     */
    @Nonnull
    JImmutableRandomAccessList insert(int index,
                                         @Nullable T value);

    /**
     * Adds a value to the front of the list.  May be invoked on an empty list.
     * Synonym for insert()
     *
     * @param value
     * @return
     */
    @Nonnull
    JImmutableRandomAccessList insertFirst(@Nullable T value);

    /**
     * Adds a value to the end of the list.  May be invoked on an empty list.
     * Synonym for insert().
     *
     * @param value
     * @return
     */
    @Nonnull
    JImmutableRandomAccessList insertLast(@Nullable T value);

    /**
     * Removes the first value from the list and reduces size by 1.  size() must be greater than zero
     *
     * @return new PersistentList without last value
     * @throws IndexOutOfBoundsException if list is already empty
     */
    @Nonnull
    JImmutableRandomAccessList deleteFirst();

    /**
     * Removes the last value from the list and reduces size by 1.  size() must be greater than zero
     *
     * @return new PersistentList without last value
     * @throws IndexOutOfBoundsException if list is already empty
     */
    @Nonnull
    JImmutableRandomAccessList deleteLast();

    /**
     * Delete value at index (which must be within the current bounds of the list).
     * Shifts all values at and after index one position to the left and subtracts 1
     * from size of the list.
     *
     * @param index
     * @return
     */
    @Nonnull
    JImmutableRandomAccessList delete(int index);

    /**
     * @return an equivalent collection with no values
     */
    @Nonnull
    JImmutableRandomAccessList deleteAll();
}