de.intarsys.pdf.encoding.MappedEncoding Maven / Gradle / Ivy
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This is a fork of http://sourceforge.net/projects/jpodlib/ as development seems to be frozen.
We're providing some bug fixes along with deployments to maven.
/*
* Copyright (c) 2007, intarsys consulting GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of intarsys nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package de.intarsys.pdf.encoding;
import de.intarsys.pdf.cos.COSObject;
import java.util.HashMap;
import java.util.Map;
/**
* A MappedEncoding is an explicit map from a codepoint to a character.
*
*
* A MappedEncoding can be constructed individually (as in a DifferenceEncoding)
* or be one of the predefined well known encodings that are implemented using
* unique instances.
*
*/
public class MappedEncoding extends Encoding {
/**
* The number of 1:1 mappings from character to code points.
*
*
* This is done for the first 256 bytes of character to cache the most often
* used chars.
*
*/
private static final int ARRAY_MAPPING_SIZE = 256;
/**
* encode characters indexes
*/
private Map indexedEncoding = new HashMap();
/**
* encode character names
*/
private Map namedEncoding = new HashMap();
/**
* encode characters performance optimization
*/
private int[] fastEncoding = new int[ARRAY_MAPPING_SIZE];
/**
* decode codepoints
*/
private int[] indexDecoding = new int[ARRAY_MAPPING_SIZE];
/**
* decode character names. This is for performance reasons as it is needed
* for computing a text's width.
*/
private String[] nameDecoding = new String[ARRAY_MAPPING_SIZE];
{
for (int i = 0; i < ARRAY_MAPPING_SIZE; i++) {
fastEncoding[i] = -1;
}
for (int i = 0; i < indexDecoding.length; i++) {
indexDecoding[i] = -1;
}
for (int i = 0; i < nameDecoding.length; i++) {
nameDecoding[i] = GlyphNameMap.GLYPH_NOTDEF;
}
}
/**
* When constructing manually, one can define a map from
* {@code codePoint} to {@code name} with this method.
*
* @param codePoint The codePoint from 0..255 where the character should be
* mapped.
* @param name The name of the character to be mapped.
*/
public void addEncoding(int codePoint, String name) {
int unicode = GlyphNameMap.Standard.getUnicode(name);
defineEntry(codePoint, unicode, name);
}
/**
* Add a known complete tuple. THis is used if we do not have a name/unicode
* standard map (for example in symbolic fonts).
*
* @param codePoint The codePoint from 0..255 where the character should be
* mapped.
* @param name The name of the character to be mapped.
* @param character The character value
*/
public void addEncoding(int codePoint, String name, int character) {
defineEntry(codePoint, character, name);
}
@Override
public COSObject cosGetObject() {
return null;
}
/**
* Define an entry that establishes a relationship between codepoint,
* character and Adobe glyph name.
*
* @param codepoint The codepoint.
* @param character The character.
* @param name The Adobe glyph name.
*/
protected void defineEntry(int codepoint, int character, String name) {
// byte/name association
nameDecoding[codepoint] = name;
Integer codePointInteger = Integer.valueOf(codepoint);
namedEncoding.put(name, codePointInteger);
// byte character association
indexDecoding[codepoint] = character;
indexedEncoding.put(Integer.valueOf(character), codePointInteger);
//
if ((character >= 0) && (character < ARRAY_MAPPING_SIZE)) {
fastEncoding[character] = codepoint;
}
}
@Override
public int getDecoded(int byteValue) {
return indexDecoding[byteValue];
}
@Override
public int getEncoded(int character) {
if ((character >= 0) && (character < ARRAY_MAPPING_SIZE)) {
return fastEncoding[character];
} else {
Integer ii = (Integer) indexedEncoding.get(Integer.valueOf(character));
if (ii == null) {
return -1;
}
return ii.intValue();
}
}
@Override
public int getEncoded(String name) {
Integer codePoint = (Integer) namedEncoding.get(name);
if (codePoint == null) {
return -1;
} else {
return codePoint.intValue();
}
}
@Override
public String getGlyphName(int codePoint) {
if ((codePoint < 0) || (codePoint > 255)) {
return GlyphNameMap.GLYPH_NOTDEF;
}
return nameDecoding[codePoint];
}
/**
* The internal representation of the decoding map from codepoints to
* characters.
*
* @return The internal representation of the decoding map from codepoints
* to characters.
*/
protected int[] getIndexDecoding() {
return indexDecoding;
}
/**
* The internal representation of the encoding map from characters to
* codepoints.
*
* @return The internal representation of the encoding map from characters
* to codepoints.
*/
protected Map getIndexedEncoding() {
return indexedEncoding;
}
@Override
public String getName() {
return "MappedEncoding";
}
/**
* The internal representation of the decoding map from codePoint to
* character name.
*
* @return The internal representation of the decoding map from codePoint to
* character name.
*/
protected String[] getNameDecoding() {
return nameDecoding;
}
/**
* The internal representation of the encoding map from characters names to
* codepoint.
*
* @return The internal representation of the encoding map from characters
* names to codepoint.
*/
protected Map getNamedEncoding() {
return namedEncoding;
}
}