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/fonts/AFPFontAttributes.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: AFPFontAttributes.java 746664 2009-02-22 12:40:44Z jeremias $ */

package org.apache.fop.afp.fonts;

/**
 * This class encapsulates the font attributes that need to be included
 * in the AFP data stream. This class does not assist in converting the
 * font attributes to AFP code pages and character set values.
 */
public class AFPFontAttributes {

    /** the font reference */
    private int fontReference;

    /** the font key */
    private final String fontKey;

    /** the font */
    private final AFPFont font;

    /** the point size */
    private final int pointSize;

    /**
     * Constructor for the AFPFontAttributes
     *
     * @param fontKey the font key
     * @param font the font
     * @param pointSize the point size
     */
    public AFPFontAttributes(String fontKey, AFPFont font, int pointSize) {
        this.fontKey = fontKey;
        this.font = font;
        this.pointSize = pointSize;
    }

    /**
     * Return the font
     *
     * @return the font
     */
    public AFPFont getFont() {
        return font;
    }

    /**
     * Return the FontKey attribute
     *
     * @return the FontKey attribute
     */
    public String getFontKey() {
        return fontKey + pointSize;
    }

    /**
     * Return the point size attribute
     *
     * @return the point size attribute
     */
    public int getPointSize() {
        return pointSize;
    }

    /**
     * Return the FontReference attribute
     *
     * @return the FontReference attribute
     */
    public int getFontReference() {
        return fontReference;
    }

    /**
     * Sets the FontReference attribute
     *
     * @param fontReference the FontReference to set
     */
    public void setFontReference(int fontReference) {
        this.fontReference = fontReference;
    }

    /** {@inheritDoc} */
    public String toString() {
        return "fontReference=" + fontReference
            + ", fontKey=" + fontKey
            + ", font=" + font
            + ", pointSize=" + pointSize;
    }
}

⏎ org/apache/fop/afp/fonts/AFPFontAttributes.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)