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/*
* Copyright 2007 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package java.util;
/**
* Skeletal implementation of the List interface. [Sun
* docs]
*
* @param the element type.
*/
public abstract class AbstractList extends AbstractCollection implements
List {
private class IteratorImpl implements Iterator {
/*
* i is the index of the item that will be returned on the next call to
* next() last is the index of the item that was returned on the previous
* call to next() or previous (for ListIterator), -1 if no such item exists.
*/
int i = 0, last = -1;
public boolean hasNext() {
return i < AbstractList.this.size();
}
public E next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
return AbstractList.this.get(last = i++);
}
public void remove() {
if (last < 0) {
throw new IllegalStateException();
}
AbstractList.this.remove(last);
i = last;
last = -1;
}
}
/**
* Implementation of ListIterator for abstract lists.
*/
private final class ListIteratorImpl extends IteratorImpl implements
ListIterator {
/*
* i is the index of the item that will be returned on the next call to
* next() last is the index of the item that was returned on the previous
* call to next() or previous (for ListIterator), -1 if no such item exists.
*/
private ListIteratorImpl() {
// Nothing to do
}
private ListIteratorImpl(int start) {
int size = AbstractList.this.size();
if (start < 0 || start > size) {
indexOutOfBounds(start, size);
}
i = start;
}
public void add(E o) {
AbstractList.this.add(i++, o);
last = -1;
}
public boolean hasPrevious() {
return i > 0;
}
public int nextIndex() {
return i;
}
public E previous() {
if (!hasPrevious()) {
throw new NoSuchElementException();
}
return AbstractList.this.get(last = --i);
}
public int previousIndex() {
return i - 1;
}
public void set(E o) {
if (last == -1) {
throw new IllegalStateException();
}
AbstractList.this.set(last, o);
}
}
private static class SubList extends AbstractList {
private final List wrapped;
private final int fromIndex;
private int size;
public SubList(List wrapped, int fromIndex, int toIndex) {
this.wrapped = wrapped;
this.fromIndex = fromIndex;
size = getSize(fromIndex, toIndex);
if (fromIndex > toIndex) {
throw new IllegalArgumentException("fromIndex: " + fromIndex +
" > toIndex: " + toIndex);
}
if (fromIndex < 0) {
throw new IndexOutOfBoundsException("fromIndex: " + fromIndex +
" < 0");
}
if (toIndex > wrapped.size()) {
throw new IndexOutOfBoundsException("toIndex: " + toIndex +
" > wrapped.size() " + wrapped.size());
}
}
@Override
public void add(int index, E element) {
checkIndexForAdd(index);
size++;
wrapped.add(fromIndex + index, element);
}
@Override
public E get(int index) {
checkIndex(index);
return wrapped.get(fromIndex + index);
}
@Override
public E remove(int index) {
checkIndex(index);
E result = wrapped.remove(fromIndex + index);
size--;
return result;
}
@Override
public E set(int index, E element) {
checkIndex(index);
return wrapped.set(fromIndex + index, element);
}
@Override
public int size() {
return size;
}
private void checkIndex(int index) {
checkIndex(index, size);
}
private void checkIndexForAdd(int index) {
checkIndex(index, size + 1);
}
private int getSize(int fromIndex, int toIndex) {
return toIndex - fromIndex;
}
}
protected static void checkIndex(int index, int size) {
if (index < 0 || index >= size) {
indexOutOfBounds(index, size);
}
}
/**
* Throws an indexOutOfBoundsException.
*/
protected static void indexOutOfBounds(int index, int size) {
throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + size);
}
protected AbstractList() {
}
@Override
public boolean add(E obj) {
add(size(), obj);
return true;
}
public void add(int index, E element) {
throw new UnsupportedOperationException("Add not supported on this list");
}
public boolean addAll(int index, Collection c) {
Iterator iter = c.iterator();
boolean changed = false;
while (iter.hasNext()) {
add(index++, iter.next());
changed = true;
}
return changed;
}
@Override
public void clear() {
removeRange(0, size());
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if (!(o instanceof List)) {
return false;
}
List other = (List) o;
if (size() != other.size()) {
return false;
}
Iterator iter = iterator();
Iterator iterOther = other.iterator();
while (iter.hasNext()) {
E elem = iter.next();
Object elemOther = iterOther.next();
if (!(elem == null ? elemOther == null : elem.equals(elemOther))) {
return false;
}
}
return true;
}
public abstract E get(int index);
@Override
public int hashCode() {
int k = 1;
final int coeff = 31;
Iterator iter = iterator();
while (iter.hasNext()) {
E obj = iter.next();
k = coeff * k + (obj == null ? 0 : obj.hashCode());
k = ~~k;
}
return k;
}
public int indexOf(Object toFind) {
for (int i = 0, n = size(); i < n; ++i) {
if (toFind == null ? get(i) == null : toFind.equals(get(i))) {
return i;
}
}
return -1;
}
@Override
public Iterator iterator() {
return new IteratorImpl();
}
public int lastIndexOf(Object toFind) {
for (int i = size() - 1; i > -1; --i) {
if (toFind == null ? get(i) == null : toFind.equals(get(i))) {
return i;
}
}
return -1;
}
public ListIterator listIterator() {
return listIterator(0);
}
public ListIterator listIterator(int from) {
return new ListIteratorImpl(from);
}
public E remove(int index) {
throw new UnsupportedOperationException("Remove not supported on this list");
}
public E set(int index, E o) {
throw new UnsupportedOperationException("Set not supported on this list");
}
public List subList(int fromIndex, int toIndex) {
return new SubList(this, fromIndex, toIndex);
}
protected void removeRange(int fromIndex, int endIndex) {
ListIterator iter = listIterator(fromIndex);
for (int i = fromIndex; i < endIndex; ++i) {
iter.next();
iter.remove();
}
}
}
