package it.unimi.dsi.fastutil.ints;
import java.util.Iterator;
import java.util.NoSuchElementException;
public final class IntBigListIterators {
private IntBigListIterators() {
}
public static class EmptyBigListIterator implements IntBigListIterator, java.io.Serializable, Cloneable {
private static final long serialVersionUID = -7046029254386353129L;
protected EmptyBigListIterator() {
}
@Override
public boolean hasNext() {
return false;
}
@Override
public boolean hasPrevious() {
return false;
}
@Override
public int nextInt() {
throw new NoSuchElementException();
}
@Override
public int previousInt() {
throw new NoSuchElementException();
}
@Override
public long nextIndex() {
return 0;
}
@Override
public long previousIndex() {
return -1;
}
@Override
public long skip(long n) {
return 0;
};
@Override
public long back(long n) {
return 0;
};
@Override
public Object clone() {
return EMPTY_BIG_LIST_ITERATOR;
}
private Object readResolve() {
return EMPTY_BIG_LIST_ITERATOR;
}
}
public static final EmptyBigListIterator EMPTY_BIG_LIST_ITERATOR = new EmptyBigListIterator();
private static class SingletonBigListIterator implements IntBigListIterator {
private final int element;
private int curr;
public SingletonBigListIterator(final int element) {
this.element = element;
}
@Override
public boolean hasNext() {
return curr == 0;
}
@Override
public boolean hasPrevious() {
return curr == 1;
}
@Override
public int nextInt() {
if (!hasNext())
throw new NoSuchElementException();
curr = 1;
return element;
}
@Override
public int previousInt() {
if (!hasPrevious())
throw new NoSuchElementException();
curr = 0;
return element;
}
@Override
public long nextIndex() {
return curr;
}
@Override
public long previousIndex() {
return curr - 1;
}
}
public static IntBigListIterator singleton(final int element) {
return new SingletonBigListIterator(element);
}
public static class UnmodifiableBigListIterator implements IntBigListIterator {
protected final IntBigListIterator i;
public UnmodifiableBigListIterator(final IntBigListIterator i) {
this.i = i;
}
@Override
public boolean hasNext() {
return i.hasNext();
}
@Override
public boolean hasPrevious() {
return i.hasPrevious();
}
@Override
public int nextInt() {
return i.nextInt();
}
@Override
public int previousInt() {
return i.previousInt();
}
@Override
public long nextIndex() {
return i.nextIndex();
}
@Override
public long previousIndex() {
return i.previousIndex();
}
}
public static IntBigListIterator unmodifiable(final IntBigListIterator i) {
return new UnmodifiableBigListIterator(i);
}
public static class BigListIteratorListIterator implements IntBigListIterator {
protected final IntListIterator i;
protected BigListIteratorListIterator(final IntListIterator i) {
this.i = i;
}
private int intDisplacement(long n) {
if (n < Integer.MIN_VALUE || n > Integer.MAX_VALUE)
throw new IndexOutOfBoundsException("This big iterator is restricted to 32-bit displacements");
return (int) n;
}
@Override
public void set(int ok) {
i.set(ok);
}
@Override
public void add(int ok) {
i.add(ok);
}
@Override
public int back(int n) {
return i.back(n);
}
@Override
public long back(long n) {
return i.back(intDisplacement(n));
}
@Override
public void remove() {
i.remove();
}
@Override
public int skip(int n) {
return i.skip(n);
}
@Override
public long skip(long n) {
return i.skip(intDisplacement(n));
}
@Override
public boolean hasNext() {
return i.hasNext();
}
@Override
public boolean hasPrevious() {
return i.hasPrevious();
}
@Override
public int nextInt() {
return i.nextInt();
}
@Override
public int previousInt() {
return i.previousInt();
}
@Override
public long nextIndex() {
return i.nextIndex();
}
@Override
public long previousIndex() {
return i.previousIndex();
}
}
public static IntBigListIterator asBigListIterator(final IntListIterator i) {
return new BigListIteratorListIterator(i);
}
}