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/*
* Copyright 1999-2005 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;
// Java
import java.util.List;
// XML
import org.xml.sax.SAXException;
// Apache
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* This is the model for the area tree object.
* The model implementation can handle the page sequence,
* page and off-document items.
* 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 class AreaTreeModel {
private List pageSequenceList = null;
private int currentPageSequenceIndex = -1;
private List currentPageSequencePageList;
private List offDocumentItems = new java.util.ArrayList();
protected static Log log = LogFactory.getLog(AreaTreeModel.class);
/**
* Create a new store pages model
*/
public AreaTreeModel() {
pageSequenceList = new java.util.ArrayList();
}
/**
* Start a page sequence on this model.
* @param title the title of the new page sequence
*/
public void startPageSequence(LineArea title) {
currentPageSequencePageList = new java.util.ArrayList();
pageSequenceList.add(currentPageSequencePageList);
currentPageSequenceIndex = pageSequenceList.size() - 1;
}
/**
* Add a page to this model.
* @param page the page to add to the model.
*/
public void addPage(PageViewport page) {
currentPageSequencePageList.add(page);
int pageIndex = 0;
for (int i = 0; i < currentPageSequenceIndex; i++) {
pageIndex += ((List)pageSequenceList.get(i)).size();
}
pageIndex += currentPageSequencePageList.size() - 1;
page.setPageIndex(pageIndex);
}
/**
* Handle an OffDocumentItem
* @param ext the extension to handle
*/
public void handleOffDocumentItem(OffDocumentItem ext) {};
/**
* Signal the end of the document for any processing.
* @throws SAXException if a problem was encountered.
*/
public void endDocument() throws SAXException {};
/**
* Get the page sequence count.
* @return the number of page sequences in the document.
*/
public int getPageSequenceCount() {
return pageSequenceList.size();
}
/**
* Get the page count.
* @param seq the page sequence to count.
* @return returns the number of pages in a page sequence
*/
public int getPageCount(int seq) {
List sequence = (List) pageSequenceList.get(seq - 1);
return sequence.size();
}
/**
* 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 PageViewport getPage(int seq, int count) {
List sequence = (List) pageSequenceList.get(seq - 1);
return (PageViewport) sequence.get(count);
}
}
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