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/fonts/substitute/FontSubstitutions.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: FontSubstitutions.java 1762060 2016-09-23 12:57:46Z ssteiner $ */

package org.apache.fop.fonts.substitute;

import java.util.Iterator;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.apache.fop.fonts.FontInfo;
import org.apache.fop.fonts.FontTriplet;

/**
 * Font substitutions
 */
public class FontSubstitutions extends java.util.ArrayList<FontSubstitution> {

    private static final long serialVersionUID = -9173104935431899722L;

    /** logging instance */
    protected static final Log log = LogFactory.getLog(FontSubstitutions.class);

    /**
     * Adjusts a given fontInfo using this font substitution catalog
     * @param fontInfo font info
     */
    public void adjustFontInfo(FontInfo fontInfo) {
        for (Iterator<FontSubstitution> subsIt = super.iterator(); subsIt.hasNext();) {
            FontSubstitution substitution = subsIt.next();

            // find the best matching font triplet
            FontQualifier toQualifier = substitution.getToQualifier();
            FontTriplet fontTriplet = toQualifier.bestMatch(fontInfo);
            if (fontTriplet == null) {
                log.error("Unable to match font substitution for destination qualifier "
                        + toQualifier);
                continue;
            }
            String internalFontKey = fontInfo.getInternalFontKey(fontTriplet);

            FontQualifier fromQualifier = substitution.getFromQualifier();
            List<FontTriplet> tripletList = fromQualifier.getTriplets();
            for (Object aTripletList : tripletList) {
                FontTriplet triplet = (FontTriplet) aTripletList;
                fontInfo.addFontProperties(internalFontKey, triplet);
            }
        }
    }
}

⏎ org/apache/fop/fonts/substitute/FontSubstitutions.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)