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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
//
// Copyright (c) 2014, Burton Computer Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// 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.
//
//     Neither the name of the Burton Computer Corporation nor the names
//     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
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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package org.javimmutable.collections.array.bit32;

import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.Holder;
import org.javimmutable.collections.Holders;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.cursors.SingleValueCursor;

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

@Immutable
public class SingleBit32Array
        extends Bit32Array
        implements JImmutableMap.Entry
{
    private final int index;
    private final T value;

    SingleBit32Array(int index,
                     T value)
    {
        this.index = index;
        this.value = value;
    }

    @Override
    @Nullable
    public T getValueOr(int index,
                        @Nullable T defaultValue)
    {
        checkIndex(index);
        return (this.index == index) ? value : defaultValue;
    }

    @Nonnull
    @Override
    public Holder find(int index)
    {
        checkIndex(index);
        return (this.index == index) ? Holders.of(value) : Holders.of();
    }

    @Nonnull
    @Override
    public Bit32Array assign(int index,
                                @Nullable T value)
    {
        checkIndex(index);
        if (this.index == index) {
            return (this.value != value) ? new SingleBit32Array(index, value) : this;
        } else {
            return new StandardBit32Array(this.index, this.value, index, value);
        }
    }

    @Nonnull
    @Override
    public Bit32Array delete(int index)
    {
        checkIndex(index);
        return (this.index == index) ? Bit32Array.of() : this;
    }

    @Override
    public int size()
    {
        return 1;
    }

    @Override
    public int firstIndex()
    {
        return index;
    }

    @Nonnull
    @Override
    public Integer getKey()
    {
        return index;
    }

    @Override
    public T getValue()
    {
        return value;
    }

    @Override
    public boolean isEmpty()
    {
        return false;
    }

    @Override
    @Nonnull
    public Cursor> cursor()
    {
        return SingleValueCursor.>of(this);
    }
}