FontCheckDummy.java

/*
 * Copyright 2002-2004 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package build.tools.fontchecker;

import java.awt.*;
import java.awt.image.*;
import java.io.*;

/**
 * FontCheckDummy (not unlike Crash Test Dummy).
 *
 * <PRE>
 * FontCheckDummy is the "child" process. Its task is to verify
 * integrity of system fonts. Since unexpected crashes are known
 * to occur when certain fonts are manipulated, the process is
 * "monitored" by the parent process, which might have to restart
 * the "child" if it crashes.
 * </PRE>
 *
 * @author Ilya Bagrak
 */
public class FontCheckDummy implements FontCheckerConstants {

    /**
     * Input stream from parent process.
     */
    private BufferedReader is;

    /**
     * Output stream to parent process.
     */
    private BufferedOutputStream os;

    /**
     * Image on which font characters will be drawn.
     */
    private BufferedImage bi;

    /**
     * graphics object on which characters will be drawn.
     */
    private Graphics graphics;

    /**
     * This constructor wraps the process's standard output and input streams
     * to enable easier communication with parent process. It also initializes
     * the graphics object used for drawing font characters.
     * <BR><BR>
     * @see FontCheckerConstants
     */
    public FontCheckDummy() {
        is = new BufferedReader(new InputStreamReader(System.in));
        os = new BufferedOutputStream(System.out);
        /* make suffficient space for 12 point font */
        bi = new BufferedImage(40, 40, BufferedImage.TYPE_INT_RGB);
        graphics = bi.getGraphics();
        try {
            os.write(CHILD_STARTED_OK);
            os.flush();
        } catch (IOException e) {
            System.exit(-1);
        }
    }

    /**
     * Initializes an instance of Font from given font path.
     * <BR>
     * This methods attempts to create an instance of font from
     * a string that represents path to the font file.
     * <BR><BR>
     * @param fontPath string representing path to font file
     * @param flag indicating whether or not checking of non-TrueType fonts
     * is necessary
     */
    private void testFont(String fontPath, boolean checkNonTTF) {

        FontFileFilter fff = new FontFileFilter(checkNonTTF);
        File fontFile = new File(fontPath);
        if (!fontFile.canRead()) {
            try {
                os.write(ERR_FONT_NOT_FOUND);
                os.flush();
            } catch (IOException e) {
                System.exit(-1);
            }
        }
        Font font = null;
        try {
            File file = new File(fontPath);
            font = Font.createFont(fff.getFontType(fontPath), file);
        } catch (FontFormatException e1) {
        } catch (IOException e2) {
        }
        if (font == null) {
             return;
        }
        font = font.deriveFont(Font.PLAIN, 12);
        String name = font.getFontName();
        String family = font.getFamily();

        char[] testChars = { '0' };
        if (font.canDisplay(testChars[0])) {
            graphics.setFont(font);
            graphics.drawChars(testChars, 0, 1, 20, 20);
        }
        try {
            os.write(ERR_FONT_OK);
            os.flush();
        } catch (IOException e) {
            System.exit(-1);
        }
    }

    /**
     * Begins synchronous communication betweeen parent and child processes.
     * <BR>
     * This method begins communication between parent and child processes.
     * FontCheckDummy reads a line of text from input stream (@see #is).
     */
    public void run() {
        String command = null;
        while (true) {
            try {
                command = is.readLine();
            } catch (IOException e) {
                System.exit(-1);
            }
            if (command != null && command.length() >= 1) {
                int cmd = Integer.parseInt(command.substring(0,1));
                if (cmd == EXITCOMMAND) {
                    return;
                }
                boolean checkNonTTF = ((cmd == 1) ? true : false);
                String fontPath = command.substring(1);
                testFont(fontPath, checkNonTTF);
            } else {
                return;
            }
        }
    }

    public static void main(String[] args) {
        try {
            /* Background app. */
            System.setProperty("java.awt.headless", "true");
            System.setProperty("sun.java2d.noddraw", "true");
            new FontCheckDummy().run();
        } catch (Throwable t) {
        }
        System.exit(0);
    }
}