com.sun.pdfview.font.PDFCMap Maven / Gradle / Ivy
/*
* $Id: PDFCMap.java,v 1.3 2009/02/12 13:53:54 tomoke Exp $
*
* Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.sun.pdfview.font;
import java.io.IOException;
import java.util.HashMap;
import com.sun.pdfview.PDFObject;
/**
* A CMap maps from a character in a composite font to a font/glyph number
* pair in a CID font.
*
* @author jkaplan
*/
public abstract class PDFCMap {
/**
* A cache of known CMaps by name
*/
private static HashMap cache;
/** Creates a new instance of CMap */
protected PDFCMap() {}
/**
* Get a CMap, given a PDF object containing one of the following:
* a string name of a known CMap
* a stream containing a CMap definition
*/
public static PDFCMap getCMap(PDFObject map) throws IOException {
if (map.getType() == PDFObject.NAME) {
return getCMap(map.getStringValue());
} else if (map.getType() == PDFObject.STREAM) {
return parseCMap(map);
} else {
throw new IOException("CMap type not Name or Stream!");
}
}
/**
* Get a CMap, given a string name
*/
public static PDFCMap getCMap(String mapName) throws IOException {
if (cache == null) {
populateCache();
}
if (!cache.containsKey(mapName)) {
throw new IOException("Unknown CMap: " + mapName);
}
return (PDFCMap) cache.get(mapName);
}
/**
* Populate the cache with well-known types
*/
protected static void populateCache() {
cache = new HashMap();
// add the Identity-H map
cache.put("Identity-H", new PDFCMap() {
public char map(char src) {
return src;
}
});
}
/**
* Parse a CMap from a CMap stream
*/
protected static PDFCMap parseCMap(PDFObject map) throws IOException {
throw new IOException("Parsing CMap Files Unsupported!");
}
/**
* Map a given source character to a destination character
*/
public abstract char map(char src);
/**
* Get the font number assoicated with a given source character
*/
public int getFontID(char src) {
return 0;
}
}