JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2003, 2006, Oracle and/or its affiliates. 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.font;

import java.io.File;
import java.awt.Font;
import java.util.HashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.Locale;

public class FontFamily {

    private static ConcurrentHashMap<String, FontFamily>
        familyNameMap = new ConcurrentHashMap<String, FontFamily>();
    private static HashMap<String, FontFamily> allLocaleNames;

    protected String familyName;
    protected Font2D plain;
    protected Font2D bold;
    protected Font2D italic;
    protected Font2D bolditalic;
    protected boolean logicalFont = false;
    protected int familyRank;

    public static FontFamily getFamily(String name) {
        return familyNameMap.get(name.toLowerCase(Locale.ENGLISH));
    }

    public static String[] getAllFamilyNames() {
        return null;
    }

    /* Only for use by FontManager.deRegisterBadFont(..).
     * If this was the only font in the family, the family is removed
     * from the map
     */
    static void remove(Font2D font2D) {

        String name = font2D.getFamilyName(Locale.ENGLISH);
        FontFamily family = getFamily(name);
        if (family == null) {
            return;
        }
        if (family.plain == font2D) {
            family.plain = null;
        }
        if (family.bold == font2D) {
            family.bold = null;
        }
        if (family.italic == font2D) {
            family.italic = null;
        }
        if (family.bolditalic == font2D) {
            family.bolditalic = null;
        }
        if (family.plain == null && family.bold == null &&
            family.plain == null && family.bold == null) {
            familyNameMap.remove(name);
        }
    }

    public FontFamily(String name, boolean isLogFont, int rank) {
        logicalFont = isLogFont;
        familyName = name;
        familyRank = rank;
        familyNameMap.put(name.toLowerCase(Locale.ENGLISH), this);
    }

    /* Create a family for created fonts which aren't listed in the
     * main map.
     */
    FontFamily(String name) {
        logicalFont = false;
        familyName = name;
        familyRank = Font2D.DEFAULT_RANK;
    }

    public String getFamilyName() {
        return familyName;
    }

    public int getRank() {
        return familyRank;
    }

    private boolean isFromSameSource(Font2D font) {
        if (!(font instanceof FileFont)) {
            return false;
        }

        FileFont existingFont = null;
        if (plain instanceof FileFont) {
            existingFont = (FileFont)plain;
        } else if (bold instanceof FileFont) {
            existingFont = (FileFont)bold;
        } else if (italic instanceof FileFont) {
             existingFont = (FileFont)italic;
        } else if (bolditalic instanceof FileFont) {
             existingFont = (FileFont)bolditalic;
        }
        // A family isn't created until there's a font.
        // So if we didn't find a file font it means this
        // isn't a file-based family.
        if (existingFont == null) {
            return false;
        }
        File existDir = (new File(existingFont.platName)).getParentFile();

        FileFont newFont = (FileFont)font;
        File newDir = (new File(newFont.platName)).getParentFile();
        return java.util.Objects.equals(newDir, existDir);
    }

    public void setFont(Font2D font, int style) {
        /* Allow a lower-rank font only if its a file font
         * from the exact same source as any previous font.
         */
        if ((font.getRank() > familyRank) && !isFromSameSource(font)) {
            if (FontUtilities.isLogging()) {
                FontUtilities.getLogger()
                                  .warning("Rejecting adding " + font +
                                           " of lower rank " + font.getRank() +
                                           " to family " + this +
                                           " of rank " + familyRank);
            }
            return;
        }

        switch (style) {

        case Font.PLAIN:
            plain = font;
            break;

        case Font.BOLD:
            bold = font;
            break;

        case Font.ITALIC:
            italic = font;
            break;

        case Font.BOLD|Font.ITALIC:
            bolditalic = font;
            break;

        default:
            break;
        }
    }

    public Font2D getFontWithExactStyleMatch(int style) {

        switch (style) {

        case Font.PLAIN:
            return plain;

        case Font.BOLD:
            return bold;

        case Font.ITALIC:
            return italic;

        case Font.BOLD|Font.ITALIC:
            return bolditalic;

        default:
            return null;
        }
    }

    /* REMIND: if the callers of this method are operating in an
     * environment in which not all fonts are registered, the returned
     * font may be a algorithmically styled one, where in fact if loadfonts
     * were executed, a styled font may be located. Our present "solution"
     * to this is to register all fonts in a directory and assume that this
     * registered all the styles of a font, since they would all be in the
     * same location.
     */
    public Font2D getFont(int style) {

        switch (style) {

        case Font.PLAIN:
            return plain;

        case Font.BOLD:
            if (bold != null) {
                return bold;
            } else if (plain != null && plain.canDoStyle(style)) {
                    return plain;
            } else {
                return null;
            }

        case Font.ITALIC:
            if (italic != null) {
                return italic;
            } else if (plain != null && plain.canDoStyle(style)) {
                    return plain;
            } else {
                return null;
            }

        case Font.BOLD|Font.ITALIC:
            if (bolditalic != null) {
                return bolditalic;
            } else if (italic != null && italic.canDoStyle(style)) {
                    return italic;
            } else if (bold != null && bold.canDoStyle(style)) {
                    return italic;
            } else if (plain != null && plain.canDoStyle(style)) {
                    return plain;
            } else {
                return null;
            }
        default:
            return null;
        }
    }

    /* Only to be called if getFont(style) returns null
     * This method will only return null if the family is completely empty!
     * Note that it assumes the font of the style you need isn't in the
     * family. The logic here is that if we must substitute something
     * it might as well be from the same family.
     */
     Font2D getClosestStyle(int style) {

        switch (style) {
            /* if you ask for a plain font try to return a non-italic one,
             * then a italic one, finally a bold italic one */
        case Font.PLAIN:
            if (bold != null) {
                return bold;
            } else if (italic != null) {
                return italic;
            } else {
                return bolditalic;
            }

            /* if you ask for a bold font try to return a non-italic one,
             * then a bold italic one, finally an italic one */
        case Font.BOLD:
            if (plain != null) {
                return plain;
            } else if (bolditalic != null) {
                return bolditalic;
            } else {
                return italic;
            }

            /* if you ask for a italic font try to return a  bold italic one,
             * then a plain one, finally an bold one */
        case Font.ITALIC:
            if (bolditalic != null) {
                return bolditalic;
            } else if (plain != null) {
                return plain;
            } else {
                return bold;
            }

        case Font.BOLD|Font.ITALIC:
            if (italic != null) {
                return italic;
            } else if (bold != null) {

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