font.java

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        }

        if ((inp_style & ((STYLE_UNDERLINED << 1) - 1)) != inp_style) {
            throw new IllegalArgumentException("Illegal style");
        }

        if ((inp_size != SIZE_SMALL) 
            && (inp_size != SIZE_MEDIUM)
            && (inp_size != SIZE_LARGE)) {
            throw new IllegalArgumentException("Unsupported size");
        }

        synchronized (Display.LCDUILock) {
            /* IMPL_NOTE: this makes garbage.  But hashtables need Object keys. */
            Integer key = new Integer(inp_face | inp_style | inp_size);
            Font f = (Font)table.get(key);
            if (f == null) {
                f = new Font(inp_face, inp_style, inp_size);
                table.put(key, f);
            }

            return f;
        }
    }

    /**
     * Gets the style of the font. The value is an <code>OR'ed</code>
     * combination of
     * <code>STYLE_BOLD</code>, <code>STYLE_ITALIC</code>, and
     * <code>STYLE_UNDERLINED</code>; or the value is
     * zero (<code>STYLE_PLAIN</code>).
     * @return style of the current font
     *
     * @see #isPlain()
     * @see #isBold()
     * @see #isItalic()
     */
    public int getStyle() {
        // SYNC NOTE: return of atomic value, no locking necessary
        return style;
    };

    /**
     * Gets the size of the font.
     *
     * @return one of <code>SIZE_SMALL</code>, <code>SIZE_MEDIUM</code>,
     * <code>SIZE_LARGE</code>
     */
    public int getSize() {
        // SYNC NOTE: return of atomic value, no locking necessary
        return size;
    }

    /**
     * Gets the face of the font.
     *
     * @return one of <code>FACE_SYSTEM</code>,
     * <code>FACE_PROPORTIONAL</code>, <code>FACE_MONOSPACE</code>
     */
    public int getFace() { 
        // SYNC NOTE: return of atomic value, no locking necessary
        return face;
    }

    /**
     * Returns <code>true</code> if the font is plain.
     * @see #getStyle()
     * @return <code>true</code> if font is plain
     */
    public boolean isPlain() {
        // SYNC NOTE: return of atomic value, no locking necessary
        return style == STYLE_PLAIN;
    }

    /**
     * Returns <code>true</code> if the font is bold.
     * @see #getStyle()
     * @return <code>true</code> if font is bold
     */
    public boolean isBold() {
        // SYNC NOTE: return of atomic value, no locking necessary
        return (style & STYLE_BOLD) == STYLE_BOLD;
    }
 
    /**
     * Returns <code>true</code> if the font is italic.
     * @see #getStyle()
     * @return <code>true</code> if font is italic
     */
    public boolean isItalic() {
        // SYNC NOTE: return of atomic value, no locking necessary
        return (style & STYLE_ITALIC) == STYLE_ITALIC;
    }

    /**
     * Returns <code>true</code> if the font is underlined.
     * @see #getStyle()
     * @return <code>true</code> if font is underlined
     */
    public boolean isUnderlined() {
        // SYNC NOTE: return of atomic value, no locking necessary
        return (style & STYLE_UNDERLINED) == STYLE_UNDERLINED;
    }
        
    /**
     * Gets the standard height of a line of text in this font. This value
     * includes sufficient spacing to ensure that lines of text painted this
     * distance from anchor point to anchor point are spaced as intended by the
     * font designer and the device. This extra space (leading) occurs below 
     * the text.
     * @return standard height of a line of text in this font (a 
     * non-negative value)
     */
    public int getHeight() {
        // SYNC NOTE: return of atomic value, no locking necessary
        return height;
    }

    /**
     * Gets the distance in pixels from the top of the text to the text's
     * baseline.
     * @return the distance in pixels from the top of the text to the text's
     * baseline
     */
    public int getBaselinePosition() {
        // SYNC NOTE: return of atomic value, no locking necessary
        return baseline;
    }

    /**
     * Gets the advance width of the specified character in this Font.
     * The advance width is the horizontal distance that would be occupied if
     * <code>ch</code> were to be drawn using this <code>Font</code>, 
     * including inter-character spacing following
     * <code>ch</code> necessary for proper positioning of subsequent text.
     * 
     * @param ch the character to be measured
     * @return the total advance width (a non-negative value)
     */
    public native int charWidth(char ch);

    /**
     * Returns the advance width of the characters in <code>ch</code>, 
     * starting at the specified offset and for the specified number of
     * characters (length).
     * The advance width is the horizontal distance that would be occupied if
     * the characters were to be drawn using this <code>Font</code>,
     * including inter-character spacing following
     * the characters necessary for proper positioning of subsequent text.
     *
     * <p>The <code>offset</code> and <code>length</code> parameters must
     * specify a valid range of characters
     * within the character array <code>ch</code>. The <code>offset</code>
     * parameter must be within the
     * range <code>[0..(ch.length)]</code>, inclusive.
     * The <code>length</code> parameter must be a non-negative
     * integer such that <code>(offset + length) &lt;= ch.length</code>.</p>
     *
     * @param ch the array of characters
     * @param offset the index of the first character to measure
     * @param length the number of characters to measure
     * @return the width of the character range
     * @throws ArrayIndexOutOfBoundsException if <code>offset</code> and
     * <code>length</code> specify an
     * invalid range
     * @throws NullPointerException if <code>ch</code> is <code>null</code>
     */
    public native int charsWidth(char[] ch, int offset, int length);

    /**
     * Gets the total advance width for showing the specified
     * <code>String</code>
     * in this <code>Font</code>.
     * The advance width is the horizontal distance that would be occupied if
     * <code>str</code> were to be drawn using this <code>Font</code>, 
     * including inter-character spacing following
     * <code>str</code> necessary for proper positioning of subsequent text.
     * 
     * @param str the <code>String</code> to be measured
     * @return the total advance width
     * @throws NullPointerException if <code>str</code> is <code>null</code>
     */
    public native int stringWidth(java.lang.String str);

    /**
     * Gets the total advance width for showing the specified substring in this
     * <code>Font</code>.
     * The advance width is the horizontal distance that would be occupied if
     * the substring were to be drawn using this <code>Font</code>,
     * including inter-character spacing following
     * the substring necessary for proper positioning of subsequent text.
     *
     * <p>
     * The <code>offset</code> and <code>len</code> parameters must
     * specify a valid range of characters
     * within <code>str</code>. The <code>offset</code> parameter must
     * be within the
     * range <code>[0..(str.length())]</code>, inclusive.
     * The <code>len</code> parameter must be a non-negative
     * integer such that <code>(offset + len) &lt;= str.length()</code>.
     * </p>
     *
     * @param str the <code>String</code> to be measured
     * @param offset zero-based index of first character in the substring
     * @param len length of the substring
     * @return the total advance width
     * @throws StringIndexOutOfBoundsException if <code>offset</code> and
     * <code>length</code> specify an
     * invalid range
     * @throws NullPointerException if <code>str</code> is <code>null</code>
     */
    public native int substringWidth(String str, int offset, int len);


    // private implementation //

    /** The face of this Font */
    private int face;
    /** The style of this Font */
    private int style;
    /** The point size of this Font */
    private int size;
    /** The baseline of this Font */
    private int baseline;
    /** The height of this Font */
    private int height;

    /**
     * The "default" font, constructed from the 'system' face,
     * plain style, and 'medium' size point.
     */
    private static Font DEFAULT_FONT;

    /**
     * A hashtable used to maintain a store of created Fonts
     * so they are not re-created in the future
     */
    private static java.util.Hashtable table = new java.util.Hashtable(4);

    /**
     * Natively initialize this Font object's peer
     *
     * @param inp_face The face to initialize the native Font
     * @param inp_style The style to initialize the native Font
     * @param inp_size The point size to initialize the native Font
     */
    private native void init(int inp_face, int inp_style, int inp_size);
}