What Is fop.jar? I got it from the fop-2.7-bin.zip.

fop.jar in fop-2.7-bin.zip is the JAR file for FOP 2.7, which is a print formatter driven by XSL formatting objects (XSL-FO). You can obtain fop.jar from the build folder of the fop-2.7-bin.zip file.

Below is the information about the fop.jar (2.2) file:

JAR File Size and Download Location:

JAR name: fop.jar, fop-2.7.jar
Target JDK version: 1.7
File name: fop.jar
File size: 4442817 bytes
Release date: 20-Jan-2022
Download: Apache FOP Website

Java source code files for fop.jar:

⏎ org/apache/fop/area/PageSequence.java

/*
 * 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: PageSequence.java 1395692 2012-10-08 17:47:48Z vhennebert $ */

package org.apache.fop.area;

import java.util.List;
import java.util.Locale;

/**
 * Represents a page sequence in the area tree.
 */
public class PageSequence extends AreaTreeObject {

    private List<PageViewport> pages = new java.util.ArrayList<PageViewport>();
    private LineArea title;

    private Locale locale;

    /**
     * Main constructor
     * @param title the title for the page-sequence, may be null
     */
    public PageSequence(LineArea title) {
        setTitle(title);
    }

    /**
     * @return the title of the page sequence in form of a line area, or null if there's no title
     */
    public LineArea getTitle() {
        return this.title;
    }

    /**
     * Sets the page sequence's title.
     * @param title the title
     */
    public void setTitle(LineArea title) {
        this.title = title;
    }

    /**
     * Adds a new page to the page sequence
     * @param page the page to be added
     */
    public void addPage(PageViewport page) {
        this.pages.add(page);
    }

    /**
     * @return the number of pages currently in this page sequence
     */
    public int getPageCount() {
        return this.pages.size();
    }

    /**
     * Returns the page at the given index.
     * @param idx the index of the requested page
     * @return the requested page or null if it was not found
     */
    public PageViewport getPage(int idx) {
        return this.pages.get(idx);
    }

    /**
     * Indicates whether a page is the first in this page sequence.
     * @param page the page to be inspected
     * @return true if the page is the first in this page sequence, false otherwise
     */
    public boolean isFirstPage(PageViewport page) {
        return page.equals(getPage(0));
    }

    /**
     * Sets the locale that applies to this page-sequence.
     *
     * @param locale the locale to set
     */
    public void setLocale(Locale locale) {
        this.locale = locale;
    }

    /**
     * Returns the locale of this page-sequence.
     *
     * @return the locale, {@code null} if not set
     */
    public Locale getLocale() {
        return locale;
    }

}

⏎ org/apache/fop/area/PageSequence.java

Or download all of them as a single archive file:

File name: fop-2.7-src.zip
File size: 3401312 bytes
Release date: 2022-01-20
Download 

⇒ "fop" Command in fop-2.7-bin.zip

⇐ What Is fop-2.7-bin.zip

⇑ Download and Installing of FOP 2.x

⇑⇑ FAQ for FOP (Formatting Object Processor)