# GlyphCache.java

    /*
     * Licensed to the Apache Software Foundation (ASF) under one or more
     * contributor license agreements.  See the NOTICE file distributed with
     * this work for additional information regarding copyright ownership.
     * The ASF licenses this file to You under the Apache License, Version 2.0
     * (the "License"); you may not use this file except in compliance with
     * the License.  You may obtain a copy of the License at
     *
     *      http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */
    package org.apache.pdfbox.rendering;

    import java.awt.geom.GeneralPath;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.pdfbox.pdmodel.font.PDFontLike;
    import org.apache.pdfbox.pdmodel.font.PDSimpleFont;
    import org.apache.pdfbox.pdmodel.font.PDType0Font;
    import org.apache.pdfbox.pdmodel.font.PDVectorFont;

    /**
     * A simple glyph outline cache.
     *
     * @author John Hewson
     */
    final class GlyphCache
    {
        private static final Log LOG = LogFactory.getLog(GlyphCache.class);

        private final PDVectorFont font;
        private final Map<Integer, GeneralPath> cache = new HashMap<>();

        GlyphCache(PDVectorFont font)
        {
            this.font = font;
        }

        public GeneralPath getPathForCharacterCode(int code)
        {
            GeneralPath path = cache.get(code);
            if (path != null)
            {
                return path;
            }

            try
            {
                if (!font.hasGlyph(code))
                {
                    String fontName = ((PDFontLike) font).getName();
                    if (font instanceof PDType0Font)
                    {
                        int cid = ((PDType0Font) font).codeToCID(code);
                        String cidHex = String.format("%04x", cid);
                        LOG.warn("No glyph for code " + code + " (CID " + cidHex + ") in font " + fontName);
                    }
                    else if (font instanceof PDSimpleFont)
                    {
                        PDSimpleFont simpleFont = (PDSimpleFont) font;
                        LOG.warn("No glyph for code " + code + " in " + font.getClass().getSimpleName()
                                + " " + fontName + " (embedded or system font used: "
                                + simpleFont.getFontBoxFont().getName() + ")");
                        if (code == 10 && simpleFont.isStandard14())
                        {
                            // PDFBOX-4001 return empty path for line feed on std14
                            path = new GeneralPath();
                            cache.put(code, path);
                            return path;
                        }
                    }
                    else
                    {
                        LOG.warn("No glyph for code " + code + " in font " + fontName);
                    }
                }

                path = font.getNormalizedPath(code);
                cache.put(code, path);
                return path;
            }
            catch (IOException e)
            {
                // todo: escalate this error?
                String fontName = ((PDFontLike) font).getName();
                LOG.error("Glyph rendering failed for code " + code + " in font " + fontName, e);
                return new GeneralPath();
            }
        }
    }