import java.io.*;
import java.util.*;

public class KeyGenerator implements Serializable
{
    protected PrintWriter file;
    Database theSchema;
    CodeGenerator theGenerator;

    public KeyGenerator(CodeGenerator generator)
    {
        theGenerator = generator;
        theSchema = theGenerator.getTheSchema();
    }

    protected void OpenFile(String filename)
    {
        try {
            file = new PrintWriter( new FileWriter(filename) );
            theGenerator.RegisterFile(filename);
        }
        catch(IOException e) {
            System.err.println("GENJAVA-F-BADOUTPUT: " +
                               filename + " - " +
                               e.getMessage());
            System.exit(-1);
        }
    }

    public void Generate()
    {
        String filename = new String();

        filename = new String(Genjava.directory);
        filename += Genjava.filesep;
        filename += "Key.java";

        OpenFile( filename );
        file.println("import java.text.DecimalFormat;");
        file.println("import java.io.*;");
        file.println("import java.util.*;");
        file.println();
        file.println("public class Key implements Serializable");
        file.println("{");
        file.println();
        file.println("    protected int value = 0;");
        if( Genjava.cli_keysize == 12 ) {
            file.println("    public static final int size = 12;");
            file.println("    public static final int versize = 3;");
            file.println("    public static final int abbsize = 4;");
            file.println("    public static final int rowsize = 5;");
        }
        else {
            file.println("    public static final int size = 8;");
            file.println("    public static final int versize = 2;");
            file.println("    public static final int abbsize = 2;");
            file.println("    public static final int rowsize = 4;");
        }

        file.println("    protected final int abbmask = 0x000000FF;");
        file.println("    protected final int abbshift = 24;");
        file.println("    protected final int vermask = 0x000000FF;");
        file.println("    protected final int vershift = 16;");
        file.println("    protected final int rowmask = 0x0000FFFF;");
        file.println("    protected final int rowshift = 0;");
        file.println("    protected Database TheSchema;");
        file.println("    protected boolean Constructed;");
        file.println();
        file.println("    public Key(String strval, Database mySchema)");
        file.println("    {");
        file.println("        String buffer;");
        file.println("        int tmpint;");
        file.println();
        file.println("        Constructed = false;");
        file.println();
        file.println("        do {");
        file.println("            setTheSchema(mySchema);");
        file.println();
        file.println("            buffer = strval.substring( 0, Key.abbsize );");
        file.println("            if(!setAbb(buffer))");
        file.println("                break;");
        file.println();
        file.println("            buffer = strval.substring( Key.abbsize, ");
        file.println("                         Key.abbsize + Key.versize );");
        file.println("            tmpint = Integer.parseInt(buffer);");
        file.println("            if(!setVersion(tmpint))");
        file.println("                break;");
        file.println();
        file.println("            buffer = strval.substring( Key.abbsize + Key.versize, ");
        file.println("                         Key.size);");
        file.println("            tmpint = Integer.parseInt(buffer);");
        file.println("            if(!setRow(tmpint))");
        file.println("                break;");
        file.println();
        file.println("            Constructed = true;");
        file.println("        } while(false);");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Returns true if this key was able to be built successfully.");
        file.println("     * The usual cause for failure is if the table abbreviation found is invalid.");
        file.println("     */");
        file.println("    public boolean Valid()");
        file.println("    {");
        file.println("        return Constructed;");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Returns the integer encoding for the key");
        file.println("     */");
        file.println("    public int getValue()");
        file.println("    {");
        file.println("        return value;");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Returns > 0 if the integer key value is greater than that of otherkey,");
        file.println("     * Returns < 0 if the integer key value is less than that of otherkey,");
        file.println("     * Returns 0 if the integer key value is equal to that of otherkey,");
        file.println("     */");
        file.println("    public int compare( Key otherkey )");
        file.println("    {");
        file.println("        return ( value - otherkey.getValue() );");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Sets the version bytes of the key from its argument");
        file.println("     */");
        file.println("    public boolean setVersion(int r)");
        file.println("    {");
        file.println("        value &= ~(vermask << vershift);	// Clear field");
        file.println("        value |= (r & vermask) << vershift;");
        file.println("        return true;");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Retrieves the version bytes of the key");
        file.println("     */");
        file.println("    public int getVersion()");
        file.println("    {");
        file.println("        return (value >> vershift) & vermask;");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Sets the row number of the key from its argument");
        file.println("     */");
        file.println("    public boolean setRow(int r)");
        file.println("    {");
        file.println("        value &= ~(rowmask << rowshift);");
        file.println("        value |= (r & rowmask) << rowshift;");
        file.println("        return true;");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Retrieves the row number from the key");
        file.println("     */");
        file.println("    public int getRow()");
        file.println("    {");
        file.println("        return (value >> rowshift) & rowmask;");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Sets the table abbreviation portion of the key");
        file.println("     */");
        file.println("    public boolean setAbb(String ab)");
        file.println("    {");
        file.println("        int i;");
        file.println("        i = TheSchema.FindTblIdx(ab);");
        file.println();
        file.println("        if( i < 0 )");
        file.println("            return false;");
        file.println();
        file.println("        value &= ~(abbmask << abbshift);");
        file.println("        value |= (i & abbmask) << abbshift;");
        file.println("        return true;");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Retrieves the table abbreviation portion of the key");
        file.println("     */");
        file.println("    public String getAbb()");
        file.println("    {");
        file.println("        int i = (value >> abbshift) & abbmask;");
        file.println();
        file.println("        return TheSchema.FindTblAbbr(i);");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Retrieves a reference to the global schema");
        file.println("     */");
        file.println("    public Database getTheSchema()");
        file.println("    {");
        file.println("        return TheSchema;");
        file.println("    }");
        file.println();
        file.println("    /**");
        file.println("     * Modifies this object's reference to the global schema");
        file.println("     */");
        file.println("    public void setTheSchema(Database value)");
        file.println("    {");
        file.println("        TheSchema = value;");
        file.println("    }");
        file.println();
        file.println("    public String toString()");
        file.println("    {");
        file.println("        String retval;");
        if( Genjava.cli_keysize == 12 ) {
            file.println("        DecimalFormat threeDigits = new DecimalFormat( \"000\" );");
            file.println("        DecimalFormat fiveDigits = new DecimalFormat( \"00000\" );");
            file.println();
            file.println("        retval = getAbb();");
            file.println("        retval += twoDigits.format(getVersion());");
            file.println("        retval += fourDigits.format(getRow());");
        }
        else {
            file.println("        DecimalFormat twoDigits = new DecimalFormat( \"00\" );");
            file.println("        DecimalFormat fourDigits = new DecimalFormat( \"0000\" );");
            file.println();
            file.println("        retval = getAbb();");
            file.println("        retval += twoDigits.format(getVersion());");
            file.println("        retval += fourDigits.format(getRow());");
        }
        file.println("        return retval;");
        file.println("    }");
        file.println("}");

        file.close();
    }
}