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Barcode4J is a flexible generator for barcodes written in Java inclusive extensions to support Apache FOP 0.93 and later.

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/*
 * Copyright 2002-2004 Jeremias Maerki.
 * 
 * Licensed 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.
 */
package org.krysalis.barcode4j;

/**
 * This interface defines methods to build classic 1D barcodes.
 * 
 * @author Jeremias Maerki
 * @version $Id: ClassicBarcodeLogicHandler.java,v 1.2 2004/09/04 20:25:54 jmaerki Exp $
 */
public interface ClassicBarcodeLogicHandler extends BarcodeLogicHandler {
    
    /**
     * This method is called when a new group of bars is about to start. A
     * group of bars may be generated by a character (or group of characters) 
     * of the message to be encoded or by a start/end control group.
     * @param type a constant indicating the type of group. The meaning of the
     * integer values is implementation-dependant.
     * @param submsg In case of parts of the message to be encoded this 
     * parameter holds the character or characters being encoded.
     */
    void startBarGroup(BarGroup type, String submsg);
    
    /**
     * This method indicates a new bar to be painted.
     * @param black True if the bar is to be painted black, False if 
     * white/transparent
     * @param weight logical weight of the bar.  Concrete implementations are
     * free to define this to be height or width.  For example, 1 may be interpreted 
     * as "narrow bar", 2 as "wide bar" for certain barcodes.  While other barcodes
     * might define 1 to be "short bar", 2 as "tall bar".
     * Also, this should not be confused with the effective painting width, or the 
     * actual physical size of the bar. 
     */
    void addBar(boolean black, int weight);
    
    /**
     * This method indicates the end of a previously started bar group. The
     * method calls to startBarGroup and endBarGroup form a stack.
     */
    void endBarGroup();
    
}