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## org.apache.fop.area
Class RenderPagesModel

    java.lang.Object
      org.apache.fop.area.AreaTreeModel
          org.apache.fop.area.RenderPagesModel

Direct Known Subclasses:
  CachedRenderPagesModel

public class RenderPagesModel
extends AreaTreeModel

This uses the AreaTreeModel to store the pages Each page is either rendered if ready or prepared for later rendering. Once a page is rendered it is cleared to release the contents but the PageViewport is retained. So even though the pages are stored the contents are discarded.

Field Summary
`protected java.util.List` | `prepared` Pages that have been prepared but not rendered yet.
`protected Renderer` | `renderer` The renderer that will render the pages.

Fields inherited from class org.apache.fop.area.AreaTreeModel
`currentPageSequence, log`

Constructor Summary
`RenderPagesModel(FOUserAgent userAgent, java.lang.String outputFormat, FontInfo fontInfo, java.io.OutputStream stream)` Create a new render pages model with the given renderer.

Method Summary
`void` | `addPage(PageViewport page)` Add a page to the render page model.
`protected boolean` | `checkPreparedPages(PageViewport newPageViewport, boolean renderUnresolved)` Check prepared pages
`void` | `endDocument()` End the document.
`void` | `handleOffDocumentItem(OffDocumentItem oDI)` Handle an OffDocumentItem
`protected void` | `preparePage(PageViewport page)` Prepare a page.
`protected void` | `renderPage(PageViewport pageViewport)` Renders the given page and notified about unresolved IDs if any.
`void` | `startPageSequence(PageSequence pageSequence)` Start a page sequence on this model.

Methods inherited from class org.apache.fop.area.AreaTreeModel
`getCurrentPageSequence, getPage, getPageCount, getPageSequenceCount`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### renderer

    protected Renderer renderer

  The renderer that will render the pages.

### prepared

    protected java.util.List prepared

  Pages that have been prepared but not rendered yet.

Constructor Detail

### RenderPagesModel

    public RenderPagesModel(FOUserAgent userAgent,
                            java.lang.String outputFormat,
                            FontInfo fontInfo,
                            java.io.OutputStream stream)
                     throws FOPException

  Create a new render pages model with the given renderer.

Parameters:
  `userAgent` - FOUserAgent object for process
  `outputFormat` - the MIME type of the output format to use (ex. "application/pdf").
  `fontInfo` - FontInfo object
  `stream` - OutputStream
Throws:
  `FOPException` - if the renderer cannot be properly initialized

Method Detail

### startPageSequence

    public void startPageSequence(PageSequence pageSequence)

  Start a page sequence on this model.

  Overrides:
    `startPageSequence` in class `AreaTreeModel`
  Parameters:
    `pageSequence` - the page sequence about to start

### addPage

    public void addPage(PageViewport page)

  Add a page to the render page model. If the page is finished it can be rendered immediately. If the page needs resolving then if the renderer supports out of order rendering it can prepare the page. Otherwise the page is added to a queue.

  Overrides:
    `addPage` in class `AreaTreeModel`
  Parameters:
    `page` - the page to add to the model

### checkPreparedPages

    protected boolean checkPreparedPages(PageViewport newPageViewport,
                                         boolean renderUnresolved)

  Check prepared pages

  Parameters:
    `newPageViewport` - the new page being added
    `renderUnresolved` - render pages with unresolved idref's (done at end-of-document processing)
  Returns:
    true if the current page should be rendered false if the renderer doesn't support out of order rendering and there are pending pages

### renderPage

    protected void renderPage(PageViewport pageViewport)

  Renders the given page and notified about unresolved IDs if any.

  Parameters:
    `pageViewport` - the page to be rendered.

### preparePage

    protected void preparePage(PageViewport page)

  Prepare a page. An unresolved page can be prepared if the renderer supports it and the page will be rendered later.

  Parameters:
    `page` - the page to prepare

### handleOffDocumentItem

    public void handleOffDocumentItem(OffDocumentItem oDI)

  Handle an OffDocumentItem

  Overrides:
    `handleOffDocumentItem` in class `AreaTreeModel`
  Parameters:
    `oDI` - the extension to handle

### endDocument

    public void endDocument()
                     throws org.xml.sax.SAXException

  End the document. Render any end document OffDocumentItems Signal the end of the document for any processing.

  Overrides:
    `endDocument` in class `AreaTreeModel`
  Throws:
    `org.xml.sax.SAXException` - if a problem was encountered.

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