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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.fonts;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.xmlgraphics.fonts.Glyphs;
import org.apache.fop.util.CharUtilities;
/**
* A simple implementation of the OneByteEncoding mostly used for encodings that are constructed
* on-the-fly.
*/
public class SimpleSingleByteEncoding implements SingleByteEncoding {
private final String name;
private final List<NamedCharacter> mapping = new ArrayList<NamedCharacter>();
private final Map<Character, Character> charMap = new HashMap<Character, Character>();
/**
* Main constructor.
* @param name the encoding's name
*/
public SimpleSingleByteEncoding(String name) {
this.name = name;
}
/** {@inheritDoc} */
public String getName() {
return this.name;
}
/** {@inheritDoc} */
public char mapChar(char c) {
Character nc = charMap.get(Character.valueOf(c));
if (nc != null) {
return nc.charValue();
}
return NOT_FOUND_CODE_POINT;
}
/** {@inheritDoc} */
public String[] getCharNameMap() {
String[] map = new String[getSize()];
Arrays.fill(map, Glyphs.NOTDEF);
for (int i = getFirstChar(); i <= getLastChar(); i++) {
NamedCharacter ch = this.mapping.get(i - 1);
map[i] = ch.getName();
}
return map;
}
/**
* Returns the index of the first defined character.
* @return the index of the first defined character (always 1 for this class)
*/
public int getFirstChar() {
return 1;
}
/**
* Returns the index of the last defined character.
* @return the index of the last defined character
*/
public int getLastChar() {
return this.mapping.size();
}
/**
* Returns the number of characters defined by this encoding.
* @return the number of characters
*/
public int getSize() {
return this.mapping.size() + 1;
}
/**
* Indicates whether the encoding is full (with 256 code points).
* @return true if the encoding is full
*/
public boolean isFull() {
return (getSize() == 256);
}
/**
* Adds a new character to the encoding.
* @param ch the named character
* @return the code point assigned to the character
*/
public char addCharacter(NamedCharacter ch) {
if (!ch.hasSingleUnicodeValue()) {
throw new IllegalArgumentException("Only NamedCharacters with a single Unicode value"
+ " are currently supported!");
}
if (isFull()) {
throw new IllegalStateException("Encoding is full!");
}
char newSlot = (char)(getLastChar() + 1);
this.mapping.add(ch);
this.charMap.put(Character.valueOf(ch.getSingleUnicodeValue()), Character.valueOf(newSlot));
return newSlot;
}
/**
* Returns the named character at a given code point in the encoding.
* @param codePoint the code point of the character
* @return the NamedCharacter (or null if no character is at this position)
*/
public NamedCharacter getCharacterForIndex(int codePoint) {
if (codePoint < 0 || codePoint > 255) {
throw new IllegalArgumentException("codePoint must be between 0 and 255");
}
if (codePoint <= getLastChar()) {
return this.mapping.get(codePoint - 1);
} else {
return null;
}
}
/** {@inheritDoc} */
public char[] getUnicodeCharMap() {
char[] map = new char[getLastChar() + 1];
for (int i = 0; i < getFirstChar(); i++) {
map[i] = CharUtilities.NOT_A_CHARACTER;
}
for (int i = getFirstChar(); i <= getLastChar(); i++) {
map[i] = getCharacterForIndex(i).getSingleUnicodeValue();
}
return map;
}
/** {@inheritDoc} */
@Override
public String toString() {
return getName() + " (" + getSize() + " chars)";
}
}
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