public PageCursor(UsageMap _enclosing)
{
this._enclosing = _enclosing;
_forwardDirHandler = new UsageMap.PageCursor.ForwardDirHandler(this);
_reverseDirHandler = new UsageMap.PageCursor.ReverseDirHandler(this);
this.Reset();
}
/// <exception cref="System.IO.IOException"></exception>
public ReferenceHandler(UsageMap _enclosing) : base(_enclosing)
{
this._enclosing = _enclosing;
int numUsagePages = (this._enclosing.GetRowEnd() - this._enclosing.GetRowStart()
- 1) / 4;
this._enclosing.SetStartOffset(this._enclosing.GetFormat().OFFSET_USAGE_MAP_PAGE_DATA
);
this._enclosing.SetPageRange(0, (numUsagePages * this.GetMaxPagesPerUsagePage()));
// there is no "start page" for a reference usage map, so we get an
// extra page reference on top of the number of page references that fit
// in the table
for (int i = 0; i < numUsagePages; i++)
{
int mapPageNum = this._enclosing.GetTableBuffer().GetInt(this.CalculateMapPagePointerOffset
(i));
if (mapPageNum > 0)
{
ByteBuffer mapPageBuffer = this._mapPageHolder.SetPage(this._enclosing.GetPageChannel
(), mapPageNum);
byte pageType = mapPageBuffer.Get();
if (pageType != PageTypes.USAGE_MAP)
{
throw new IOException("Looking for usage map at page " + mapPageNum + ", but page type is "
+ pageType);
}
mapPageBuffer.Position(this._enclosing.GetFormat().OFFSET_USAGE_MAP_PAGE_DATA);
this._enclosing.ProcessMap(mapPageBuffer, (this.GetMaxPagesPerUsagePage() * i));
}
}
}
/// <exception cref="System.IO.IOException"></exception>
internal InlineHandler(UsageMap _enclosing, bool assumeOutOfRangeBitsOn) : base(_enclosing
)
{
this._enclosing = _enclosing;
this._assumeOutOfRangeBitsOn = assumeOutOfRangeBitsOn;
this._maxInlinePages = (this.GetInlineDataEnd() - this.GetInlineDataStart()) * 8;
int startPage = this._enclosing.GetTableBuffer().GetInt(this._enclosing.GetRowStart
() + 1);
this.SetInlinePageRange(startPage);
this._enclosing.ProcessMap(this._enclosing.GetTableBuffer(), 0);
}
public Handler(UsageMap _enclosing)
{
this._enclosing = _enclosing;
}