contentlist.java

java的一个zip文件

     *
     * @param collection The collection to use.
     */
    void clearAndSet(Collection collection) {
        Content[] old = elementData;
        int oldSize = size;

        elementData = null;
        size = 0;

        if ((collection != null) && (collection.size() != 0)) {
            ensureCapacity(collection.size());
            try {
                addAll(0, collection);
            }
            catch (RuntimeException exception) {
                elementData = old;
                size = oldSize;
                throw exception;
            }
        }

        if (old != null) {
            for (int i = 0; i < oldSize; i++) {
                removeParent(old[i]);
            }
        }
        modCount++;
    }

    /**
     * Increases the capacity of this <code>ContentList</code> instance,
     * if necessary, to ensure that it can hold at least the number of
     * items specified by the minimum capacity argument.
     *
     * @param minCapacity the desired minimum capacity.
     */
    void ensureCapacity(int minCapacity) {
        if( elementData==null ) {
            elementData = new Content[Math.max(minCapacity, INITIAL_ARRAY_SIZE)];
        } else {
            int oldCapacity = elementData.length;
            if (minCapacity > oldCapacity) {
                Object oldData[] = elementData;
                int newCapacity = (oldCapacity * 3)/2 + 1;
                if (newCapacity < minCapacity)
                    newCapacity = minCapacity;
                elementData = new Content[newCapacity];
                System.arraycopy(oldData, 0, elementData, 0, size);
            }
        }
    }

    /**
     * Return the object at the specified offset.
     *
     * @param index The offset of the object.
     * @return The Object which was returned.
     */
    public Object get(int index) {
        if (index<0 || index>=size) {
            throw new IndexOutOfBoundsException("Index: " + index +
                                                " Size: " + size());
        }
        return elementData[index];
    }

    /**
     * Return a view of this list based on the given filter.
     *
     * @param filter <code>Filter</code> for this view.
     * @return a list representing the rules of the <code>Filter</code>.
     */
    List getView(Filter filter) {
        return new FilterList(filter);
    }

    /**
     * Return the index of the first Element in the list.  If the parent
     * is a <code>Document</code> then the element is the root element.
     * If the list contains no Elements, it returns -1.
     *
     * @return index of first element, or -1 if one doesn't exist
     */
    int indexOfFirstElement() {
        if( elementData!=null ) {
            for (int i = 0; i < size; i++) {
                if (elementData[i] instanceof Element) {
                    return i;
                }
            }
        }
        return -1;
    }

    /**
     * Return the index of the DocType element in the list. If the list contains
     * no DocType, it returns -1.
     *
     * @return                     index of the DocType, or -1 if it doesn't
     *                             exist
     */
    int indexOfDocType() {
        if (elementData != null) {
            for (int i = 0; i < size; i++) {
                if (elementData[i] instanceof DocType) {
                    return i;
                }
            }
        }
        return -1;
    }

    /**
     * Remove the object at the specified offset.
     *
     * @param index The offset of the object.
     * @return The Object which was removed.
     */
    public Object remove(int index) {
        if (index<0 || index>=size)
            throw new IndexOutOfBoundsException("Index: " + index +
                                                 " Size: " + size());

        Content old = elementData[index];
        removeParent(old);
        int numMoved = size - index - 1;
        if (numMoved > 0)
            System.arraycopy(elementData, index+1, elementData, index,numMoved);
        elementData[--size] = null; // Let gc do its work
        modCount++;
        return old;
    }


    /** Remove the parent of a Object */
    private static void removeParent(Content c) {
        c.setParent(null);
    }

    /**
     * Set the object at the specified location to the supplied
     * object.
     *
     * @param index The location to set the value to.
     * @param obj The location to set the value to.
     * @return The object which was replaced.
     * throws IndexOutOfBoundsException if index < 0 || index >= size()
     */
    public Object set(int index, Object obj) {
        if (index<0 || index>=size)
            throw new IndexOutOfBoundsException("Index: " + index +
                                                 " Size: " + size());

        if ((obj instanceof Element) && (parent instanceof Document)) {
            int root = indexOfFirstElement();
            if ((root >= 0) && (root != index)) {
                throw new IllegalAddException(
                  "Cannot add a second root element, only one is allowed");
            }
        }

        if ((obj instanceof DocType) && (parent instanceof Document)) {
            int docTypeIndex = indexOfDocType();
            if ((docTypeIndex >= 0) && (docTypeIndex != index)) {
                throw new IllegalAddException(
                        "Cannot add a second doctype, only one is allowed");
            }
        }

        Object old = remove(index);
        try {
            add(index, obj);
        }
        catch (RuntimeException exception) {
            add(index, old);
            throw exception;
        }
        return old;
    }

    /**
     * Return the number of items in this list
     *
     * @return The number of items in this list.
     */
    public int size() {
        return size;
    }

    /**
     * Return this list as a <code>String</code>
     *
     * @return The number of items in this list.
     */
    public String toString() {
        return super.toString();
    }

    /** Give access of ContentList.modCount to FilterList */
    private int getModCount() {
        return modCount;
    }

    /* * * * * * * * * * * * * FilterList * * * * * * * * * * * * * * * */
    /* * * * * * * * * * * * * FilterList * * * * * * * * * * * * * * * */

    /**
     * <code>FilterList</code> represents legal JDOM content, including content
     * for <code>Document</code>s or <code>Element</code>s.
     */

    class FilterList extends AbstractList implements java.io.Serializable {

        /** The Filter */
        Filter filter;

        /** Current number of items in this view */
        int count = 0;

        /** Expected modCount in our backing list */
        int expected = -1;

        // Implementation Note: Directly after size() is called, expected
        //       is sync'd with ContentList.modCount and count provides
        //       the true size of this view.  Before the first call to
        //       size() or if the backing list is modified outside this
        //       FilterList, both might contain bogus values and should
        //       not be used without first calling size();

        /**
         * Create a new instance of the FilterList with the specified Filter.
         */
        FilterList(Filter filter) {
            this.filter = filter;
        }

        /**
         * Inserts the specified object at the specified position in this list.
         * Shifts the object currently at that position (if any) and any
         * subsequent objects to the right (adds one to their indices).
         *
         * @param index The location to set the value to.
         * @param obj The object to insert into the list.
         * throws IndexOutOfBoundsException if index < 0 || index > size()
         */
        public void add(int index, Object obj) {
            if (filter.matches(obj)) {
                int adjusted = getAdjustedIndex(index);
                ContentList.this.add(adjusted, obj);
                expected++;
                count++;
            }
            else throw new IllegalAddException("Filter won't allow the " +
                                obj.getClass().getName() +
                                " '" + obj + "' to be added to the list");
        }

        /**
         * Return the object at the specified offset.
         *
         * @param index The offset of the object.
         * @return The Object which was returned.
         */
        public Object get(int index) {
            int adjusted = getAdjustedIndex(index);
            return ContentList.this.get(adjusted);
        }

        public Iterator iterator() {
            return new FilterListIterator(filter, 0);
        }

        public ListIterator listIterator() {
            return new FilterListIterator(filter, 0);
        }

        public ListIterator listIterator(int index) {
            return new FilterListIterator(filter,  index);
        }

        /**
         * Remove the object at the specified offset.
         *
         * @param index The offset of the object.
         * @return The Object which was removed.
         */
        public Object remove(int index) {
            int adjusted = getAdjustedIndex(index);
            Object old = ContentList.this.get(adjusted);
            if (filter.matches(old)) {
                old = ContentList.this.remove(adjusted);
                expected++;
                count--;
            }
            else {
                throw new IllegalAddException("Filter won't allow the " +
                                             (old.getClass()).getName() +
                                             " '" + old + "' (index " + index +
                                             ") to be removed");
            }
            return old;
        }

        /**
         * Set the object at the specified location to the supplied
         * object.
         *
         * @param index The location to set the value to.
         * @param obj The location to set the value to.
         * @return The object which was replaced.
         * throws IndexOutOfBoundsException if index < 0 || index >= size()
         */
        public Object set(int index, Object obj) {
            Object old = null;