dbforum.java

这是学习Java必须读懂两套源代码

            for (int i=0; i<users.length; i++) {
                users[i] = ((Integer)userList.get(i)).intValue();
            }
        }
        catch( SQLException sqle ) {
            System.err.println("Error in DbForum.java:" + sqle);
            sqle.printStackTrace();
        }
        finally {
            try {  pstmt.close(); }
            catch (Exception e) { e.printStackTrace(); }
            try {  con.close();   }
            catch (Exception e) { e.printStackTrace(); }
        }
        return users;
    }

    public void addGroupPermission(Group group, int permissionType)
            throws UnauthorizedException
    {
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = con.prepareStatement(ADD_GROUP_PERM);
            pstmt.setInt(1,id);
            pstmt.setInt(2,group.getID());
            pstmt.setInt(3,permissionType);
            pstmt.execute();
            //Remove user permissions from cache since they've changed. Because
            //of the way that user perm cache is handled, it is easiest to
            //simply remove all the user perm cache for the forum. This is ok
            //since happens infrequently.
            factory.getCacheManager().remove(
                DbCacheManager.USER_PERMS_CACHE,
                new Integer(id)
            );
        }
        catch( SQLException sqle ) {
            System.err.println("Error in DbForum.java:" + sqle);
            sqle.printStackTrace();
        }
        finally {
            try {  pstmt.close(); }
            catch (Exception e) { e.printStackTrace(); }
            try {  con.close();   }
            catch (Exception e) { e.printStackTrace(); }
        }
    }

    public void removeGroupPermission(Group group, int permissionType)
            throws UnauthorizedException
    {
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = con.prepareStatement(REMOVE_GROUP_PERM);
            pstmt.setInt(1,id);
            pstmt.setInt(2,group.getID());
            pstmt.setInt(3,permissionType);
            pstmt.execute();
            //Remove user permissions from cache since they've changed. Because
            //of the way that user perm cache is handled, it is easiest to
            //simply remove all the user perm cache for the forum. This is ok
            //since happens infrequently.
            factory.getCacheManager().remove(
                DbCacheManager.USER_PERMS_CACHE,
                new Integer(id)
            );
        }
        catch( SQLException sqle ) {
            System.err.println("Error in DbForum.java:" + sqle);
            sqle.printStackTrace();
        }
        finally {
            try {  pstmt.close(); }
            catch (Exception e) { e.printStackTrace(); }
            try {  con.close();   }
            catch (Exception e) { e.printStackTrace(); }
        }
    }

    public int[] groupsWithPermission(int permissionType)
            throws UnauthorizedException
    {
        int [] groups = new int[0];
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = con.prepareStatement(GROUPS_WITH_PERM);
            pstmt.setInt(1,id);
            pstmt.setInt(2,permissionType);
            ResultSet rs = pstmt.executeQuery();
            ArrayList groupList = new ArrayList();
            while (rs.next()) {
                groupList.add(new Integer(rs.getInt("groupID")));
            }
            groups = new int[groupList.size()];
            for (int i=0; i<groups.length; i++) {
                groups[i] = ((Integer)groupList.get(i)).intValue();
            }
        }
        catch( SQLException sqle ) {
            System.err.println("Error in DbForum.groupsWithPermission:" + sqle);
            sqle.printStackTrace();
        }
        finally {
            try {  pstmt.close(); }
            catch (Exception e) { e.printStackTrace(); }
            try {  con.close();   }
            catch (Exception e) { e.printStackTrace(); }
        }
        return groups;
    }

    public ForumMessage applyFilters(ForumMessage message) {
        //Loop through filters and apply them
        for (int i=0; i < filters.length; i++) {
            message = filters[i].clone(message);
        }
        return message;
    }

    public ForumMessageFilter[] getForumMessageFilters()
            throws UnauthorizedException
    {
        ForumMessageFilter [] dbFilters = new ForumMessageFilter[filters.length];
        for (int i=0; i<filters.length; i++) {
            dbFilters[i] = new DbForumMessageFilter((ForumMessage)filters[i], this);
        }
        return dbFilters;
    }

    public void addForumMessageFilter(ForumMessageFilter filter)
            throws UnauthorizedException
    {
        ArrayList newFilters = new ArrayList(filters.length+1);
        for (int i=0; i<filters.length; i++) {
            newFilters.add(filters[i]);
        }
        newFilters.add(filter);
        ForumMessageFilter[] newArray = new ForumMessageFilter[newFilters.size()];
        for (int i=0; i<newArray.length; i++) {
            newArray[i] = (ForumMessageFilter)newFilters.get(i);
        }
        //Finally, overwrite filters with the new array
        filters = newArray;
        saveFiltersToDb();
    }

    public void addForumMessageFilter(ForumMessageFilter filter, int index)
            throws UnauthorizedException
    {
        ArrayList newFilters = new ArrayList(filters.length+1);
        for (int i=0; i<filters.length; i++) {
            newFilters.add(filters[i]);
        }
        newFilters.add(index, filter);
        ForumMessageFilter[] newArray = new ForumMessageFilter[newFilters.size()];
        for (int i=0; i<newArray.length; i++) {
            newArray[i] = (ForumMessageFilter)newFilters.get(i);
        }
        //Finally, overwrite filters with the new array
        filters = newArray;
        saveFiltersToDb();
    }

    public void removeForumMessageFilter(int index)
            throws UnauthorizedException
    {
        ArrayList newFilters = new ArrayList(filters.length);
        for (int i=0; i<filters.length; i++) {
            newFilters.add(filters[i]);
        }
        newFilters.remove(index);
        ForumMessageFilter[] newArray = new ForumMessageFilter[newFilters.size()];
        for (int i=0; i<newArray.length; i++) {
            newArray[i] = (ForumMessageFilter)newFilters.get(i);
        }
        //Finally, overwrite filters with the new array
        filters = newArray;
        saveFiltersToDb();
    }

    public ForumPermissions getPermissions(Authorization authorization) {
        int userID = authorization.getUserID();

        //Get the user perm cache for this forum
        Cache userPermCache = (Cache)factory.getCacheManager().get(
            DbCacheManager.USER_PERMS_CACHE,
            new Integer(id)
        );

        //Simple case: if cache is turned on and the user is already cached,
        //we can simply return the cached permissions.
        if (userPermCache != null) {
            ForumPermissions permissions =
                    (ForumPermissions)userPermCache.get(new Integer(userID));
            if (permissions != null) {
                return permissions;
            }
        }

        //Not so simple case: cache is not turned on or the user permissions
        //have not been cached yet.
        boolean isAnonymous = (userID == -1);
        boolean isUser = !isAnonymous;

        ForumPermissions finalPermissions = ForumPermissions.none();

        //Step 1 - Get permissions for the User. This includes anonymous
        //perms, "special user" perms, and the specific perms for the user.
        if (isUser) {
            ForumPermissions userPermissions = factory.getUserPermissions(userID, id);
            //Combine permissions
            finalPermissions = new ForumPermissions(finalPermissions, userPermissions);
        }
        //Add in anonymous perms.
        ForumPermissions anonyPermissions = null;
        if (userPermCache != null) {
            anonyPermissions = (ForumPermissions)userPermCache.get(new Integer(-1));
        }
        //Otherwise, do our own lookup.
        if (anonyPermissions == null) {
            anonyPermissions = factory.getUserPermissions(-1, id);
            //Add to cache so it will be there next time.
            if (userPermCache != null) {
                userPermCache.add(new Integer(-1), anonyPermissions);
            }
        }
        //Combine permissions
        finalPermissions = new ForumPermissions(finalPermissions, anonyPermissions);

        //If they are a valid user, figure out "any user" permissions.
        if (isUser) {
            ForumPermissions specialUserPermissions = null;
            //Check for cache
            if (userPermCache != null) {
                specialUserPermissions = (ForumPermissions)userPermCache.get(new Integer(0));
            }
            //Otherwise, do our own lookup.
            if (specialUserPermissions == null) {
                specialUserPermissions = factory.getUserPermissions(0, id);
                //Add to cache so it will be there next time.
                if (userPermCache != null) {
                    userPermCache.add(new Integer(0), specialUserPermissions);
                }
            }
            //Combine permissions
            finalPermissions = new ForumPermissions(finalPermissions, specialUserPermissions);
        }

        //Step 2 -- get Permissions for all groups the user is in.
        int [] groups = ((DbProfileManager)factory.getProfileManager()).getUserGroups(userID);
        for (int i=0; i<groups.length; i++) {
            ForumPermissions groupPermissions = factory.getGroupPermissions(groups[i], id);
            finalPermissions = new ForumPermissions(finalPermissions, groupPermissions);
        }

        //Finally, add user to cache so it will be there next time.
        if (isUser && userPermCache != null) {
            userPermCache.add(new Integer(userID), finalPermissions);
        }

        return finalPermissions;
    }

    public boolean hasPermission(int type) {
        return true;
    }

    //FROM THE CACHEABLE INTERFACE//

    public int getSize() {
        //Approximate the size of the object in bytes by calculating the size
        //of each field.
        int size = 0;
        size += CacheSizes.sizeOfObject();              //overhead of object
        size += CacheSizes.sizeOfInt();                 //id
        size += CacheSizes.sizeOfString(name);          //name
        size += CacheSizes.sizeOfString(description);   //description
        size += CacheSizes.sizeOfDate();                //creation date
        size += CacheSizes.sizeOfDate();                //modified date
        size += CacheSizes.sizeOfInt();                 //moderated
        size += filters.length * 8;                     //each filter is 8 bytes
        size += CacheSizes.sizeOfProperties(properties);//properties object
        size += CacheSizes.sizeOfObject();              //save lock

        return size;
    }

    //OTHER METHODS

    /**
     * Returns a String representation of the Forum object using the forum name.
     *
     * @return a String representation of the Forum object.
     */
    public String toString() {
        return name;
    }

    public int hashCode() {
        return id;
    }

    public boolean equals(Object object) {
        if (this == object) {
            return true;
        }
        if (object != null && object instanceof DbForum) {
            return id == ((DbForum)object).getID();
        }
        else {
            return false;
        }
    }

    /**