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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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;
import org.xml.sax.SAXException;
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;
/** the current page sequence */
protected PageSequence currentPageSequence;
private List offDocumentItems = new java.util.ArrayList();
/** logger instance */
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 pageSequence the page sequence about to start
*/
public void startPageSequence(PageSequence pageSequence) {
if (pageSequence == null) {
throw new NullPointerException("pageSequence must not be null");
}
this.currentPageSequence = pageSequence;
pageSequenceList.add(currentPageSequence);
currentPageSequenceIndex = pageSequenceList.size() - 1;
}
/**
* Add a page to this model.
* @param page the page to add to the model.
*/
public void addPage(PageViewport page) {
currentPageSequence.addPage(page);
int pageIndex = 0;
for (int i = 0; i < currentPageSequenceIndex; i++) {
pageIndex += ((PageSequence)pageSequenceList.get(i)).getPageCount();
}
pageIndex += currentPageSequence.getPageCount() - 1;
page.setPageIndex(pageIndex);
page.setPageSequence(currentPageSequence);
}
/**
* 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 {};
/**
* Returns the currently active page-sequence.
* @return the currently active page-sequence
*/
public PageSequence getCurrentPageSequence() {
return this.currentPageSequence;
}
/**
* 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) {
PageSequence sequence = (PageSequence)pageSequenceList.get(seq - 1);
return sequence.getPageCount();
}
/**
* 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) {
PageSequence sequence = (PageSequence)pageSequenceList.get(seq - 1);
return sequence.getPage(count);
}
}
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