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/AttributeValue.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: AttributeValue.java 679326 2008-07-24 09:35:34Z vhennebert $ */

package org.apache.fop.fonts.substitute;

import java.util.StringTokenizer;

/**
 * Encapsulates a font attribute value
 */
public class AttributeValue extends java.util.ArrayList {

    private static final long serialVersionUID = 748610847500940557L;

    /**
     * Returns an <code>AttributeValue</code> object holding the
     * value of the specified <code>String</code>.
     *
     * @param valuesString the value to be parsed
     * @return     an <code>AttributeValue</code> object holding the value
     *             represented by the string argument.
     */
    public static AttributeValue valueOf(String valuesString) {
        AttributeValue attribute = new AttributeValue();
        StringTokenizer stringTokenizer = new StringTokenizer(valuesString, ",");
        if (stringTokenizer.countTokens() > 1) {
            while (stringTokenizer.hasMoreTokens()) {
                String token = stringTokenizer.nextToken().trim();
                AttributeValue tokenAttribute = AttributeValue.valueOf(token);
                attribute.addAll(tokenAttribute);
            }
        } else {
            String token = stringTokenizer.nextToken().trim();
            Object value = null;
            try {
                value = Integer.valueOf(token);
            } catch (NumberFormatException ex) {
                value = FontWeightRange.valueOf(token);
                if (value == null) {
                    value = token;
                }
            }
            if (value != null) {
                attribute.add(value);
            }
        }
        return attribute;
    }
}

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