TableClass.java example

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/*
 * $Id$
 *
 * Copyright (C) 2003-2015 JNode.org
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; If not, write to the Free Software Foundation, Inc., 
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
package org.jnode.awt.font.truetype;

import gnu.java.security.action.SetAccessibleAction;
import java.lang.reflect.Constructor;
import java.security.AccessController;
import java.security.PrivilegedAction;

import org.jnode.awt.font.truetype.tables.CMapTable;
import org.jnode.awt.font.truetype.tables.GlyphTable;
import org.jnode.awt.font.truetype.tables.HeadTable;
import org.jnode.awt.font.truetype.tables.HorizontalHeaderTable;
import org.jnode.awt.font.truetype.tables.HorizontalMetricsTable;
import org.jnode.awt.font.truetype.tables.LocationsTable;
import org.jnode.awt.font.truetype.tables.MaxPTable;
import org.jnode.awt.font.truetype.tables.NameTable;
import org.jnode.awt.font.truetype.tables.OS2Table;
import org.jnode.awt.font.truetype.tables.PostTable;
import org.jnode.awt.font.truetype.tables.TTFTable;

/**
 * Enumeration of all supported true type table classes.
 *
 * @author Ewout Prangsma (epr@users.sourceforge.net)
 */
enum TableClass {

    CMAP("cmap", CMapTable.class),
    GLYF("glyf", GlyphTable.class),
    HEAD("head", HeadTable.class),
    HHEA("hhea", HorizontalHeaderTable.class),
    HMTX("hmtx", HorizontalMetricsTable.class),
    LOCA("loca", LocationsTable.class),
    MAXP("maxp", MaxPTable.class),
    NAME("name", NameTable.class),
    OS2("OS/2", OS2Table.class),
    POST("post", PostTable.class);

    private final String tag;
    private final Class<? extends TTFTable> clazz;
    private static final Class<?>[] CONS_TYPES = {TTFFontData.class, TTFInput.class};

    private TableClass(String tag, Class<? extends TTFTable> clazz) {
        this.tag = tag;
        this.clazz = clazz;
    }

    /**
     * Gets the tag of this table class.
     *
     * @return
     */
    public final String getTag() {
        return tag;
    }

    /**
     * Gets the table class by its tag.
     *
     * @param tag
     * @return Null if not found.
     */
    public static final TableClass getByTag(String tag) {
        for (TableClass tc : values()) {
            if (tc.tag.equals(tag)) {
                return tc;
            }
        }
        return null;
    }

    /**
     * Create a new table of this class.
     *
     * @param font
     * @param in
     * @return
     */
    final TTFTable create(final TTFFontData font, final TTFInput in) {
/* 
 * that code should be equivalent but it is not : there a SecurityException that is thrown
 * even if the permissions is actually given to the plugin
 * TODO fix a Security bug ?
        return (TTFTable) AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {
                try {
                    final Constructor c = clazz
                            .getDeclaredConstructor(CONS_TYPES);
                    c.setAccessible(true);
                    return (TTFTable) c.newInstance(new Object[] { font, in });
                } catch (Exception e) {
                    e.printStackTrace();
                    return null;
                }
            }
        });
*/
        try {
            final Constructor<?> c = clazz.getDeclaredConstructor(CONS_TYPES);
            AccessController.doPrivileged((PrivilegedAction<?>) new SetAccessibleAction(c));
            return (TTFTable) c.newInstance(new Object[]{font, in});
        } catch (Exception e1) {
            e1.printStackTrace();
            return null;
        }
    }
}