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/afp/modca/PageGroup.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: PageGroup.java 1378049 2012-08-28 09:59:04Z mehdi $ */

package org.apache.fop.afp.modca;

import java.io.IOException;
import java.io.OutputStream;

import org.apache.fop.afp.Factory;

/**
 * A page group is used in the data stream to define a named, logical grouping
 * of sequential pages. Page groups are delimited by begin-end structured fields
 * that carry the name of the page group. Page groups are defined so that the
 * pages that comprise the group can be referenced or processed as a single
 * entity. Page groups are often processed in stand-alone fashion; that is, they
 * are indexed, retrieved, and presented outside the context of the containing
 * document.
 */
public class PageGroup extends AbstractResourceEnvironmentGroupContainer {

    /**
     * Constructor for the PageGroup.
     *
     * @param factory the resource manager
     * @param name the name of the page group
     */
    public PageGroup(Factory factory, String name) {
        super(factory, name);
    }

    /**
     * Creates a TagLogicalElement on the page.
     *
     * @param state
     *              the state of the TLE
     */
    public void createTagLogicalElement(TagLogicalElement.State state) {
        TagLogicalElement tle = factory.createTagLogicalElement(state);
        if (!getTagLogicalElements().contains(tle)) {
            getTagLogicalElements().add(tle);
        }
    }

    /**
     * Method to mark the end of the page group.
     */
    public void endPageGroup() {
        complete = true;
    }

    /** {@inheritDoc} */
    protected void writeStart(OutputStream os) throws IOException {
        byte[] data = new byte[17];
        copySF(data, Type.BEGIN, Category.PAGE_GROUP);
        os.write(data);
    }

    /** {@inheritDoc} */
    protected void writeEnd(OutputStream os) throws IOException {
        byte[] data = new byte[17];
        copySF(data, Type.END, Category.PAGE_GROUP);
        os.write(data);
    }

    /** {@inheritDoc} */
    public String toString() {
        return this.getName();
    }
}

⏎ org/apache/fop/afp/modca/PageGroup.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)