Method addAll

vm/JavaAPI/src/java/util/ArrayList.java:185–232

Inserts the objects in the specified collection at the specified location in this List. The objects are added in the order they are returned from the collection's iterator. @param location the index at which to insert. @param collection the collection of objects. @return {@cod

(int location, Collection<? extends E> collection)

     *             when {@code location < 0 || > size()}
     */
    @Override
    public boolean addAll(int location, Collection<? extends E> collection) {
        if (location < 0 || location > size) {
            throw new IndexOutOfBoundsException("Index out of bounds");
        }

        Object[] dumparray = toObjectArray(collection);
        int growSize = dumparray.length;
        // REVIEW: Why do this check here rather than check
        //         collection.size() earlier? RI behaviour?
        if (growSize == 0) {
            return false;
        }

        if (location == 0) {
            growAtFront(growSize);
            firstIndex -= growSize;
        } else if (location == size) {
            if (firstIndex + size > array.length - growSize) {
                growAtEnd(growSize);
            }
        } else { // must be case: (0 < location && location < size)
            if (array.length - size < growSize) {
                growForInsert(location, growSize);
            } else if (firstIndex + size > array.length - growSize
                       || (firstIndex > 0 && location < size / 2)) {
                int newFirst = firstIndex - growSize;
                if (newFirst < 0) {
                    int index = location + firstIndex;
                    System.arraycopy(array, index, array, index - newFirst,
                            size - location);
                    newFirst = 0;
                }
                System.arraycopy(array, firstIndex, array, newFirst, location);
                firstIndex = newFirst;
            } else {
                int index = location + firstIndex;
                System.arraycopy(array, index, array, index + growSize, size
                        - location);
            }
        }

        System.arraycopy(dumparray, 0, this.array, location + firstIndex,
                growSize);
        size += growSize;
        modCount++;
        return true;
    }

    /**
     * Adds the objects in the specified collection to this {@code ArrayList}.