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/layoutmgr/KnuthPossPosIter.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: KnuthPossPosIter.java 1067353 2011-02-05 00:13:18Z adelmelle $ */

package org.apache.fop.layoutmgr;

import java.util.List;

/**
 * A dedicated {@link PositionIterator} that is backed by an iterator
 * over a list of {@link KnuthElement}s.
 */
public class KnuthPossPosIter extends PositionIterator {

    private int iterCount;

    /**
     * Main constructor
     * @param elementList List of Knuth elements
     * @param startPos starting position, inclusive
     * @param endPos ending position, exclusive
     */
    public KnuthPossPosIter(List elementList, int startPos, int endPos) {
        super(elementList.listIterator(startPos));
        iterCount = endPos - startPos;
    }

    /**
     * Auxiliary constructor
     * @param elementList List of Knuth elements
     */
    public KnuthPossPosIter(List elementList) {
        this(elementList, 0, elementList.size());
    }

    // Check position < endPos

    /** {@inheritDoc} */
    @Override
    protected boolean checkNext() {
        if (iterCount > 0) {
            return super.checkNext();
        } else {
            endIter();
            return false;
        }
    }

    /** {@inheritDoc} */
    @Override
    public Position next() {
        --iterCount;
        return super.next();
    }

    /**
     * Peek at next, returning as ListElement.
     * @return peek at next as ListElement
     */
    public ListElement getKE() {
        return (ListElement) peekNext();
    }

    /** {@inheritDoc} */
    @Override
    protected LayoutManager getLM(Object nextObj) {
        return ((ListElement) nextObj).getLayoutManager();
    }

    /** {@inheritDoc} */
    @Override
    protected Position getPos(Object nextObj) {
        return ((ListElement) nextObj).getPosition();
    }
}

⏎ org/apache/fop/layoutmgr/KnuthPossPosIter.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)