org.apache.pdfbox.rendering.GlyphCache.java Source code

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Here is the source code for org.apache.pdfbox.rendering.GlyphCache.java

Source

/*
 * 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.PDFont;
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<Integer, GeneralPath>();

    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 = ((PDFont) font).getName();
                if (font instanceof PDType0Font) {
                    int cid = ((PDType0Font) font).codeToCID(code);
                    String cidHex = String.format("%04x", cid);
                    LOG.warn("No glyph for " + code + " (CID " + cidHex + ") in font " + fontName);
                } else {
                    LOG.warn("No glyph for " + code + " in font " + fontName);
                }
            }

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