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/FontType.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: FontType.java 1877382 2020-05-05 09:30:52Z ssteiner $ */

package org.apache.fop.fonts;

/**
 * This class enumerates all supported font types.
 */
public class FontType {

    /**
     * Collective identifier for "other" font types
     */
    public static final FontType OTHER       = new FontType("Other", 0);
    /**
     * Adobe Type 0 fonts (composite font)
     */
    public static final FontType TYPE0       = new FontType("Type0", 1);
    /**
     * Adobe Type 1 fonts
     */
    public static final FontType TYPE1       = new FontType("Type1", 2);
    /**
     * Adobe Multiple Master Type 1 fonts
     */
    public static final FontType MMTYPE1     = new FontType("MMType1", 3);
    /**
     * Adobe Type 3 fonts ("user-defined" fonts)
     */
    public static final FontType TYPE3       = new FontType("Type3", 4);
    /**
     * TrueType fonts
     */
    public static final FontType TRUETYPE    = new FontType("TrueType", 5);

    public static final FontType TYPE1C       = new FontType("Type1C", 6);

    public static final FontType CIDTYPE0       = new FontType("CIDFontType0", 7);

    private final String name;
    private final int value;


    /**
     * Construct a font type.
     * @param name a font type name
     * @param value a font type value
     */
    protected FontType(String name, int value) {
        this.name = name;
        this.value = value;
    }


    /**
     * Returns the FontType by name.
     * @param name Name of the font type to look up
     * @return the font type
     */
    public static FontType byName(String name) {
        if (name.equalsIgnoreCase(FontType.OTHER.getName())) {
            return FontType.OTHER;
        } else if (name.equalsIgnoreCase(FontType.TYPE0.getName())) {
            return FontType.TYPE0;
        } else if (name.equalsIgnoreCase(FontType.TYPE1.getName())) {
            return FontType.TYPE1;
        } else if (name.equalsIgnoreCase(FontType.MMTYPE1.getName())) {
            return FontType.MMTYPE1;
        } else if (name.equalsIgnoreCase(FontType.TYPE3.getName())) {
            return FontType.TYPE3;
        } else if (name.equalsIgnoreCase(FontType.TRUETYPE.getName())) {
            return FontType.TRUETYPE;
        } else {
            throw new IllegalArgumentException("Invalid font type: " + name);
        }
    }


    /**
     * Returns the FontType by value.
     * @param value Value of the font type to look up
     * @return the font type
     */
    public static FontType byValue(int value) {
        if (value == FontType.OTHER.getValue()) {
            return FontType.OTHER;
        } else if (value == FontType.TYPE0.getValue()) {
            return FontType.TYPE0;
        } else if (value == FontType.TYPE1.getValue()) {
            return FontType.TYPE1;
        } else if (value == FontType.MMTYPE1.getValue()) {
            return FontType.MMTYPE1;
        } else if (value == FontType.TYPE3.getValue()) {
            return FontType.TYPE3;
        } else if (value == FontType.TRUETYPE.getValue()) {
            return FontType.TRUETYPE;
        } else {
            throw new IllegalArgumentException("Invalid font type: " + value);
        }
    }

    /**
     * Returns the name
     *
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * Returns the value
     *
     * @return the value
     */
    public int getValue() {
        return value;
    }

    @Override
    public String toString() {
        return name;
    }

}

⏎ org/apache/fop/fonts/FontType.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)