package nl.tudelft.simulation.immutablecollections;

import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Vector;

/**
 * An immutable wrapper for a Vector.
 * <p>
 * Copyright (c) 2013-2018 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights
 * reserved. <br>
 * BSD-style license. See <a href="http://www.simulation.tudelft.nl/dsol/3.0/license.html">DSOL License</a>.
 * </p>
 * $LastChangedDate: 2015-07-24 02:58:59 +0200 (Fri, 24 Jul 2015) $, @version $Revision: 1147 $, by $Author: averbraeck
 * $, initial version May 7, 2016 <br>
 * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
 * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
 * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
 * @param <E> the type of content of this List
 */
public class ImmutableVector<E> extends ImmutableAbstractList<E>
{
    /** */
    private static final long serialVersionUID = 20160507L;

    /**
     * @param collection the collection to use for the immutable vector.
     */
    public ImmutableVector(final Collection<? extends E> collection)
    {
        super(new Vector<E>(collection), Immutable.COPY);
    }

    /**
     * @param vector the vector to use for the immutable vector.
     * @param copyOrWrap COPY stores a safe, internal copy of the collection; WRAP stores a pointer to the original
     *            collection
     */
    public ImmutableVector(final Vector<E> vector, final Immutable copyOrWrap)
    {
        super(copyOrWrap == Immutable.COPY ? new Vector<E>(vector) : vector, copyOrWrap);
    }

    /**
     * @param collection the immutable collection to use for the immutable vector.
     */
    public ImmutableVector(final ImmutableAbstractCollection<? extends E> collection)
    {
        super(new Vector<E>(collection.getCollection()), Immutable.COPY);
    }

    /**
     * @param vector the vector to use for the immutable vector.
     * @param copyOrWrap COPY stores a safe, internal copy of the collection; WRAP stores a pointer to the original
     *            collection
     */
    public ImmutableVector(final ImmutableVector<E> vector, final Immutable copyOrWrap)
    {
        this(copyOrWrap == Immutable.COPY ? new Vector<E>(vector.getCollection()) : vector.getCollection(), copyOrWrap);
    }

    /** {@inheritDoc} */
    @Override
    public final List<E> toList()
    {
        return new Vector<E>(getCollection());
    }

    /**
     * Returns a modifiable copy of this immutable vector.
     * @return a modifiable copy of this immutable vector.
     */
    public final Vector<E> toVector()
    {
        return new Vector<E>(getCollection());
    }

    /** {@inheritDoc} */
    @Override
    protected Vector<E> getCollection()
    {
        return (Vector<E>) super.getCollection();
    }

    /** {@inheritDoc} */
    @Override
    public final ImmutableList<E> subList(final int fromIndex, final int toIndex)
    {
        return new ImmutableVector<E>(getCollection().subList(fromIndex, toIndex));
    }

    /**
     * Copies the components of this immutable vector into the specified array. The item at index {@code k} in this
     * immutable vector is copied into component {@code k} of {@code anArray}.
     * @param anArray the array into which the components get copied
     * @throws NullPointerException if the given array is null
     * @throws IndexOutOfBoundsException if the specified array is not large enough to hold all the components of this
     *             immutable vector
     * @throws ArrayStoreException if a component of this immutable vector is not of a runtime type that can be stored
     *             in the specified array
     * @see #toArray(Object[])
     */
    public final void copyInto(final Object[] anArray)
    {
        getCollection().copyInto(anArray);
    }

    /**
     * Returns the current capacity of this immutable vector.
     * @return the current capacity of this immutable vector.
     */
    public final int capacity()
    {
        return getCollection().capacity();
    }

    /**
     * Returns an enumeration of the components of this vector. The returned {@code Enumeration} object will generate
     * all items in this vector. The first item generated is the item at index {@code 0}, then the item at index
     * {@code 1}, and so on.
     * @return an enumeration of the components of this vector
     * @see Iterator
     */
    public final Enumeration<E> elements()
    {
        return getCollection().elements();
    }

    /**
     * Returns the index of the first occurrence of the specified element in this immutable vector, searching forwards
     * from {@code index}, or returns -1 if the element is not found. More formally, returns the lowest index {@code i}
     * such that
     * <tt>(i&nbsp;&gt;=&nbsp;index&nbsp;&amp;&amp;&nbsp;(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i))))</tt>,
     * or -1 if there is no such index.
     * @param o element to search for
     * @param index index to start searching from
     * @return the index of the first occurrence of the element in this immutable vector at position {@code index} or
     *         later in the vector; {@code -1} if the element is not found.
     * @throws IndexOutOfBoundsException if the specified index is negative
     * @see Object#equals(Object)
     */
    public final int indexOf(final Object o, final int index)
    {
        return getCollection().indexOf(o, index);
    }

    /**
     * Returns the index of the last occurrence of the specified element in this immutable vector, searching backwards
     * from {@code index}, or returns -1 if the element is not found. More formally, returns the highest index {@code i}
     * such that
     * <tt>(i&nbsp;&lt;=&nbsp;index&nbsp;&amp;&amp;&nbsp;(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i))))</tt>,
     * or -1 if there is no such index.
     * @param o element to search for
     * @param index index to start searching backwards from
     * @return the index of the last occurrence of the element at position less than or equal to {@code index} in this
     *         immutable vector; -1 if the element is not found.
     * @throws IndexOutOfBoundsException if the specified index is greater than or equal to the current size of this
     *             immutable vector
     */
    public final int lastIndexOf(final Object o, final int index)
    {
        return getCollection().lastIndexOf(o, index);
    }

    /**
     * Returns the component at the specified index.
     * <p>
     * This method is identical in functionality to the {@link #get(int)} method (which is part of the {@link List}
     * interface).
     * @param index an index into this immutable vector
     * @return the component at the specified index
     * @throws ArrayIndexOutOfBoundsException if the index is out of range ({@code index < 0 || index >= size()})
     */
    public final E elementAt(final int index)
    {
        return getCollection().elementAt(index);
    }

    /**
     * Returns the first component (the item at index {@code 0}) of this immutable vector.
     * @return the first component of this immutable vector
     * @throws NoSuchElementException if this immutable vector has no components
     */
    public final E firstElement()
    {
        return getCollection().firstElement();
    }

    /**
     * Returns the last component of the immutable vector.
     * @return the last component of the immutable vector, i.e., the component at index
     *         <code>size()&nbsp;-&nbsp;1</code>.
     * @throws NoSuchElementException if this immutable vector is empty
     */
    public final E lastElement()
    {
        return getCollection().lastElement();
    }

    /** {@inheritDoc} */
    @Override
    public final String toString()
    {
        List<E> list = getCollection();
        if (null == list)
        {
            return "ImmutableVector []";
        }
        return "ImmutableVector [" + list.toString() + "]";
    }

}