/*
* 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.cocoon.components.serializers.encoding;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.util.Iterator;
import java.util.Collection;
/**
*
*
* @author <a href="mailto:pier@apache.org">Pier Fumagalli</a>, February 2003
* @version CVS $Id$
*/
public class Compiler extends CompiledCharset {
/** The class name to be generated. */
private String clazz = null;
/** The <code>CharsetEncoder</code> instance. */
private CharsetEncoder encoder = null;
/** Create a new instance of this <code>Compiler</code>. */
private Compiler(String name, String aliases[], CharsetEncoder encoder) {
super(name, aliases);
this.clazz = "cs_" + name.replace('-', '_').toUpperCase();
this.encoder = encoder;
this.compile();
}
/**
* Return true or false wether this encoding can encode the specified
* character or not.
* <p>
* This method is equivalent to the <code>allows(...)</code> method, but
* it will be called upon construction of the encoding table.
* </p>
*/
protected boolean compile(char c) {
return(this.encoder.canEncode((char)c));
}
/**
* Save this <code>Charset</code> into a Java source file.
*/
public void save()
throws IOException {
this.save(new File(System.getProperty("user.dir")));
}
/**
* Save this <code>Charset</code> into a Java source file.
*/
public void save(File directory)
throws IOException {
File file = new File(directory, this.clazz + ".java");
OutputStream out = new FileOutputStream(file);
this.save(out);
out.flush();
out.close();
}
/**
* Save this <code>Charset</code> as a Java source file to the specified
* <code>OutputStream</code>.
*/
public void save(OutputStream stream)
throws IOException {
PrintStream out = new PrintStream(new BufferedOutputStream(stream));
out.println("/*");
out.println(" * Copyright 1999-2004 The Apache Software Foundation.");
out.println(" *");
out.println(" * Licensed under the Apache License, Version 2.0 (the \"License\");");
out.println(" * you may not use this file except in compliance with the License.");
out.println(" * You may obtain a copy of the License at");
out.println(" *");
out.println(" * http://www.apache.org/licenses/LICENSE-2.0");
out.println(" *");
out.println(" * Unless required by applicable law or agreed to in writing, software");
out.println(" * distributed under the License is distributed on an \"AS IS\" BASIS,");
out.println(" * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.");
out.println(" * See the License for the specific language governing permissions and");
out.println(" * limitations under the License.");
out.println(" */");
out.println("/* Generated by " + this.getClass().getName() + " */");
out.println();
out.println("package org.apache.cocoon.components.serializers.encoding;");
out.println();
out.println("/**");
out.println(" * The <b>" + this.getName() + "</b> character set encoding representation.");
out.println(" *");
out.println(" * @author Generated by <code>" + this.getClass().getName() + "</code>");
out.println(" */");
out.println("class " + this.clazz + " extends CompiledCharset {");
out.println();
out.println(" /** The name of this charset (<b>" + this.getName() + "</b>). */");
out.println(" public static final String CS_NAME = \"" + this.getName() + "\";");
out.println();
out.println(" /** The array of alias names of this charset. */");
out.println(" public static final String CS_ALIASES[] = {");
String aliases[] = this.getAliases();
for (int x = 0; x < aliases.length; x++) out.println(" \"" + aliases[x] + "\",");
out.println(" };");
out.println();
out.println(" /** The array all characters encoded by this encoding. */");
out.print(" public static final byte CS_ENCODING[] = {");
for (int x = 0; x < this.encoding.length; x++) {
if ((x & 0x0F) == 0) {
out.println();
out.print(" ");
}
String value = Integer.toString(this.encoding[x]);
value = " ".substring(value.length()) + value;
out.print(value);
if ((x + 1) != this.encoding.length) out.print(",");
}
out.println();
out.println(" };");
out.println();
out.println(" /**");
out.println(" * Create a new instance of the <b>" + this.getName() + "</b> caracter");
out.println(" * encoding as a <code>Charset</code>.");
out.println(" */");
out.println(" public " + this.clazz + "() {");
out.println(" super(CS_NAME, CS_ALIASES, CS_ENCODING);");
out.println(" }");
out.println();
out.println(" /**");
out.println(" * Operation not supported.");
out.println(" */");
out.println(" public boolean compile(char c) {");
out.println(" throw new UnsupportedOperationException();");
out.println(" }");
out.println();
out.println("}");
out.flush();
}
/**
* Process a NIO <code>Charset</code> producing a java source file.
*/
public static Compiler process(Charset charset)
throws IOException {
CharsetEncoder encoder = charset.newEncoder();
String name = charset.displayName();
String aliases[] = new String[charset.aliases().size()];
Iterator iterator = charset.aliases().iterator();
for (int k = 0; k < aliases.length; k++) {
aliases[k] = iterator.next().toString();
}
return(new Compiler(name, aliases, encoder));
}
/**
* Compile all <code>java.nio.charset.Charset</code> classes and generate
* the main holding encodings table.
*/
public static void main(String args[])
throws IOException {
File directory = new File(System.getProperty("user.dir"));
if (args.length > 0) directory=new File(args[0]);
if (!directory.isDirectory()) {
throw new IOException("Invalid output directory \""
+ directory.getName() + "\"");
}
Collection charsets = Charset.availableCharsets().values();
Iterator iterator = charsets.iterator();
int pos = 0;
int len = charsets.size();
while (iterator.hasNext()) {
Charset charset = (Charset)iterator.next();
try {
Compiler compiler = process(charset);
compiler.save(directory);
System.out.println("Generating \"" + compiler.clazz + ".java\" "
+ "for \"" + compiler.getName() + "\" charset ("
+ (++pos) + " of " + len + ")");
} catch (Exception exception) {
System.err.println("Error generating charset \"" + charset + "\"");
System.err.print(exception.getClass().getName() + ": ");
System.err.println(exception.getMessage());
}
}
}
}