std2of5modulefactory.java

这是个国外JAVA爱好者写的条形码生成器

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package net.sourceforge.barbecue.linear.twoOfFive;

import net.sourceforge.barbecue.Module;

import java.util.Map;
import java.util.HashMap;

/**
 * Standard 2 of 5 barcode module definitions.
 *
 * @author <a href="mailto:[e-mail]">James Jenner</a>
 */
class Std2of5ModuleFactory {
    protected static final Map SET = new HashMap();
    
    public static final Module START_CHAR = new Module(new int[] {3, 1, 3, 1, 1, 1});
    public static final Module END_CHAR = new Module(new int[] {3, 1, 1, 1, 3, 1});
    
    private final static int CHECKSUM_WEIGHT_EVEN = 1;
    private final static int CHECKSUM_WEIGHT_ODD = 3;
    
    static {
        init();
    }
    
    /**
     * No public access.
     */
    protected Std2of5ModuleFactory() {
    }
    
    /**
     * Initialise the module definitions.
     */
    private static void init() {
        SET.put("0", new int[] {1, 1, 3, 3, 1});
        SET.put("1", new int[] {3, 1, 1, 1, 3});
        SET.put("2", new int[] {1, 3, 1, 1, 3});
        SET.put("3", new int[] {3, 3, 1, 1, 1});
        SET.put("4", new int[] {1, 1, 3, 1, 3});
        SET.put("5", new int[] {3, 1, 3, 1, 1});
        SET.put("6", new int[] {1, 3, 3, 1, 1});
        SET.put("7", new int[] {1, 1, 1, 3, 3});
        SET.put("8", new int[] {3, 1, 1, 3, 1});
        SET.put("9", new int[] {1, 3, 1, 3, 1});
    }
    
    /**
     * Returns the module that represents the specified character.
     * @param key The data character to get the encoding module for
     * @return The module that encodes the given char
     */
    public static Module getModule(String key) {
        /*
        Module module = null;
        module = (Module) SET.get(key);
        module.setSymbol(key);
        return module;
         */
        Module module = null;
        int[] bar = null;
        bar = (int[])SET.get(key);
        
        // this should always be true, but best to check just in case...
        if(bar != null && bar.length == 5) {
            
            // create the new module based on the selected bar val with the space as 1
            module = new Module(new int[] {
                bar[0], 1,
                bar[1], 1,
                bar[2], 1,
                bar[3], 1,
                bar[4], 1
            });

            module.setSymbol(key);
        }
        
        return module;
        
    }
    
    /**
     * Indicates whether the given character is valid for this barcode or not.
     * This basically just checks to see whether the key is in the list of
     * encoded characters.
     * @param key The key to check for validity
     * @return True if the key is valid, false otherwise
     */
    public static boolean isValid(String key) {
        return SET.containsKey(key);
    }
}