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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;
-
- import java.util.ArrayList;
- import java.util.List;
-
- /**
- * 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("<< /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("] >>");
- return sb.toString();
- }
-
- }
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