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- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.area;
-
- // XML
- import org.xml.sax.SAXException;
-
- /**
- * This is the model for the area tree object.
- * The model implementation can handle the page sequence,
- * page and extensions.
- * The methods to access the page viewports can only
- * assume the PageViewport is valid as it remains for
- * the life of the area tree model.
- */
- public abstract class AreaTreeModel {
- /**
- * Start a page sequence on this model.
- * @param title the title of the new page sequence
- */
- public abstract void startPageSequence(LineArea title);
-
- /**
- * Add a page to this moel.
- * @param page the page to add to the model.
- */
- public abstract void addPage(PageViewport page);
-
- /**
- * Handle an area tree extension
- * @param ext the extension to handle
- * @param when when the extension should be handled
- */
- public abstract void handleExtension(TreeExt ext, int when);
-
- /**
- * Signal the end of the document for any processing.
- */
- public abstract void endDocument() throws SAXException;
-
- /**
- * Get the page sequence count.
- * @return the number of page sequences in the document.
- */
- public abstract int getPageSequenceCount();
-
- /**
- * Get the page count.
- * @param seq the page sequence to count.
- * @return returns the number of pages in a page sequence
- */
- public abstract int getPageCount(int seq);
-
- /**
- * Get the page for a position in the document.
- * @param seq the page sequence number
- * @param count the page count in the sequence
- * @return the PageViewport for the particular page
- */
- public abstract PageViewport getPage(int seq, int count);
-
- }
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