# FontCache.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.pdmodel.font;

    import java.lang.ref.SoftReference;
    import java.util.Map;
    import java.util.concurrent.ConcurrentHashMap;
    import org.apache.fontbox.FontBoxFont;

    /**
     * An in-memory cache for system fonts. This allows PDFBox to manage caching for a {@link FontProvider}.
     * PDFBox is free to purge this cache at will.
     *
     * @author John Hewson
     */
    public final class FontCache
    {
        private final Map<FontInfo, SoftReference<FontBoxFont>> cache = new ConcurrentHashMap<>();

        /**
         * Adds the given FontBox font to the cache.
         */
        public void addFont(FontInfo info, FontBoxFont font)
        {
            cache.put(info, new SoftReference<>(font));
        }

        /**
         * Returns the FontBox font associated with the given FontInfo.
         */
        public FontBoxFont getFont(FontInfo info)
        {
            SoftReference<FontBoxFont> reference = cache.get(info);
            return reference != null ? reference.get() : null;
        }
    }