PC World Komputer 1996 May/PCW596.iso/wtest/clico/sunsoft/java/solaris.taz/solaris/hotjava/classsrc/awt/FontTable.java

Java Source | 1995-05-15 | 4.5 KB | 170 lines

/*
 * @(#)FontTable.java    1.11 95/04/10 Sami Shaio
 *
 * Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies. Please refer to the file "copyright.html"
 * for further important copyright and licensing information.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */
package awt;

import java.lang.*;
import java.util.*;

/**
 * A class that creates font objects. Fonts are addressed by names in
 * the FontTable. These names may not be the actual name of the font.
 * By default, the names "Helvetica", "TimesRoman", "ZapfDingbats",
 * "Dialog", "DialogInput", and "Courier" are always available.
 * "Dialog" is bound to a native font that is appropriate for dialog
 * components such as buttons or menus. In each font category, the
 * sizes 8, 10, 12, 14, 24, 36 are always available. Other sizes may
 * be specified and will work if the requested font is bound to a
 * scalable font on the local platform or if the platform can do
 * font-scaling. If scaling is not available, then the closest match
 * is returned.
 *
 * @version 1.11 10 Apr 1995
 * @author Sami Shaio
 */
public class FontTable {
    static Hashtable    fontTable;

    static {
    fontTable = new Hashtable(20);
    }

    /**
     * Return a platform-specific font given a generic name. See Font
     * class for the appropriate values for style.
     */
    public Font getFont(String name, int style, int height) {
    String  fName = compoundName(name, style, height);
    Font    f = (Font)(fontTable.get(fName));

    if (f==null) {
        try {
        f = new Font(name, style, height);
        } catch (Exception e) {
        return null;
        }
        fontTable.put(fName, f);
    }

    return f;
    }

    /**
     * Return a platform-specific font given a name of the form
     * <generic_name>:style:size where style can be "plain",
     * "bold", "italic" or "bolditalic".
     */
    public Font getFont(String compoundName) {
    Font        f;
    FontSpec    fspec = parseCompoundName(compoundName);

    f = (Font)(fontTable.get(compoundName));
    if (f==null) {
        try {
        f = new Font(fspec.family, fspec.style, fspec.height);
        } catch (Exception e) {
        return null;
        }
        fontTable.put(compoundName, f);
    }

    return f;
    }

    /**
     * List the number of fonts on the native platform.
     */
    public int getNativeFontCount() {
    throw new Exception("UNIMPLEMENTED");
    }

    /**
     * Return the name of the native font with the given index.
     */
    public String getNativeFont(int index) {
    throw new Exception("UNIMPLEMENTED");
    }

    /** Returns a string representation of a font-name, style and height.*/
    public String compoundName(String name, int style, int height) {
    String cn = name + ":";

    switch (style & ~Font.UNDERLINE) {
      case Font.BOLD:
        cn = cn + "bold";
        break;
      case Font.ITALIC:
        cn = cn + "italic";
        break;
      case Font.BOLD+Font.ITALIC:
        cn = cn + "bolditalic";
        break;
      case Font.PLAIN:
      default:
        cn = cn + "plain";
        break;
    }

    cn = cn + ":" + height;

    return cn;
    }

    public static FontSpec    parseCompoundName(String cname) {
    int        separator = cname.indexOf('-');
    int        pseparator;
    FontSpec    fspec = new FontSpec();
    String        field;

    if (separator == -1) {
        separator = cname.indexOf(':');
    } else {
        separator = cname.substring(0, separator).indexOf(':');
    }
    if (separator != -1) {
        fspec.family = cname.substring(0, separator);
    } else {
        return null;
    }
    pseparator = separator + 1;
    separator = cname.indexOf(':', pseparator);
    if (separator != -1) {
        field = cname.substring(pseparator, separator);
        if (field.equals("plain")) {
        fspec.style = Font.PLAIN;
        } else if (field.equals("bold")) {
        fspec.style = Font.BOLD;
        } else if (field.equals("italic")) {
        fspec.style = Font.ITALIC;
        } else if (field.equals("bolditalic")) {
        fspec.style = Font.BOLD+Font.ITALIC;
        }
        field = cname.substring(separator + 1);
    } else {
        fspec.style = Font.PLAIN;
        field = cname.substring(pseparator);
    }

    fspec.height = Integer.parseInt(field);

    return fspec;
    }
}