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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.pdf;
// Java
import java.util.List;
import java.util.ArrayList;
/**
* class representing a /Pages object.
*
* A /Pages object is an ordered collection of pages (/Page objects)
* (Actually, /Pages can contain further /Pages as well but this
* implementation doesn't allow this)
*/
public class PDFPages extends PDFObject {
/**
* the /Page objects
*/
protected List kids = new ArrayList();
/**
* the number of /Page objects
*/
protected int count = 0;
// private PDFPages parent;
/**
* create a /Pages object. NOTE: The PDFPages
* object must be created before the PDF document is
* generated, but it is not written to the stream immediately.
* It must also be allocated an object ID (so that the kids
* can refer to the parent) so that the XRef table needs to
* be updated before this object is written.
*
* @param objnum the object's number
*/
public PDFPages(int objnum) {
setObjectNumber(objnum);
}
/**
* add a /Page object.
*
* @param page the PDFPage to add.
*/
public void addPage(PDFPage page) {
page.setParent(this);
this.incrementCount();
}
/**
* Use this method to notify the PDFPages object that a child page
* @param page the child page
*/
public void notifyKidRegistered(PDFPage page) {
int idx = page.getPageIndex();
if (idx >= 0) {
while (idx > this.kids.size() - 1) {
this.kids.add(null);
}
if (this.kids.get(idx) != null) {
throw new IllegalStateException("A page already exists at index "
+ idx + " (zero-based).");
}
this.kids.set(idx, page.referencePDF());
} else {
this.kids.add(page.referencePDF());
}
}
/**
* get the count of /Page objects
*
* @return the number of pages
*/
public int getCount() {
return this.count;
}
/**
* increment the count of /Page objects
*/
public void incrementCount() {
this.count++;
// log.debug("Incrementing count to " + this.getCount());
}
/**
* {@inheritDoc}
*/
public String toPDFString() {
StringBuffer sb = new StringBuffer(64);
sb.append(getObjectID()).
append("<< /Type /Pages\n/Count ").
append(this.getCount()).
append("\n/Kids [");
for (int i = 0; i < kids.size(); i++) {
Object kid = kids.get(i);
if (kid == null) {
throw new IllegalStateException("Gap in the kids list!");
}
sb.append(kid).append(" ");
}
sb.append("] >>\nendobj\n");
return sb.toString();
}
}
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