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/*
* MetaInfo.java
*
* comments here.
*
* @author Michiaki Tatsubori
* @version %VERSION% %DATE%
* @see java.lang.Object
*
* COPYRIGHT 1999 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
*/
package io.devnulllabs.openjava.mop;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
import java.lang.reflect.Field;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.StringTokenizer;
/**
* The class <code>MetaInfo</code>
* <p>
* For example
* <pre>
* </pre>
* <p>
*
* @author Michiaki Tatsubori
* @version 1.0
* @since $Id: MetaInfo.java,v 1.2 2003/02/19 02:55:01 tatsubori Exp $
* @see java.lang.Object
*/
public final class MetaInfo
{
public static final String METACLASS_KEY = "instantiates";
public static final String DEFAULT_METACLASS = "openjava.mop.OJClass";
public static final String SUFFIX = "OJMI";
public static final String FIELD_NAME = "dict";
private Hashtable table = new Hashtable();
private String packname;
private String simpleclassname;
public MetaInfo( String metaclassname, String classname ) {
table.put( METACLASS_KEY, metaclassname );
this.simpleclassname = Environment.toSimpleName( classname );
this.packname = Environment.toPackageName( classname );
}
public MetaInfo(String classname) {
this(defaultMetaclass(classname), classname);
}
static String defaultMetaclass(String classname) {
Class mc = OJSystem.getMetabind(classname);
if (mc != null) return mc.getName();
return DEFAULT_METACLASS;
}
private String qualifiedClassName() {
if (packname == null || packname.equals( "" )) return simpleclassname;
return packname + "." + simpleclassname;
}
public MetaInfo( Class clazz ) {
this( clazz.getName() );
String minfoname = clazz.getName() + SUFFIX;
try {
Class minfo = Class.forName( minfoname );
Field f = minfo.getField( FIELD_NAME );
String[][] dict = (String[][]) f.get( null );
for (int i = 0; i < dict.length; ++i) {
table.put( dict[i][0], dict[i][1] );
}
} catch ( ClassNotFoundException e ) {
table.put(METACLASS_KEY, defaultMetaclass(clazz.getName()));
} catch ( Exception e ) {
System.err.println( "meta information class " + minfoname +
" has an illegal structure. : " + e );
table.put(METACLASS_KEY, defaultMetaclass(clazz.getName()));
}
}
public void write( Writer destout ) throws IOException {
PrintWriter out = new PrintWriter( destout );
out.println( "/*this file is generated by OpenJava system.*/" );
out.println( makePack() );
out.println( "public final class " + simpleclassname + SUFFIX );
out.println( "{" );
out.println( "public static final String[][] " + FIELD_NAME + "={" );
Enumeration key_i = keys();
Enumeration value_i = elements();
if (key_i.hasMoreElements()) {
out.print( " " );
printSet( out, key_i.nextElement(), value_i.nextElement() );
}
while (key_i.hasMoreElements()) {
out.print( "," );
printSet( out, key_i.nextElement(), value_i.nextElement() );
}
out.println( "};" );
out.println( "}" );
out.flush();
}
private String makePack() {
if (packname == null || packname.equals( "" )) return "";
return "package " + packname + ";";
}
private void printSet( PrintWriter out, Object keyobj, Object valueobj ) {
String key = (String) keyobj, value = (String) valueobj;
out.print( "{\"" );
out.print( toFlattenString( key ) );
out.print( "\",\"" );
out.print( toFlattenString( value ) );
out.println( "\"}" );
}
public String put( String key, String value ) {
return (String) table.put( key, value );
}
public String get( String key ) {
return (String) table.get( key );
}
public Enumeration keys() {
return table.keys();
}
public Enumeration elements() {
return table.elements();
}
public static String toFlattenString( String src_str ) {
StringBuffer result = null;
/* cancel double quotes and back slashs */
StringTokenizer canceller
= new StringTokenizer( src_str, "\\\"", true );
result = new StringBuffer();
while (canceller.hasMoreTokens()) {
String buf = canceller.nextToken();
if(buf.equals( "\\" ) || buf.equals( "\"" )){
result.append( "\\" );
}
result.append( buf );
}
/* remove new line chars */
StringTokenizer lnremover
= new StringTokenizer( result.toString(), "\n\r", false );
result = new StringBuffer();
while (lnremover.hasMoreTokens()) {
result.append( " " + lnremover.nextToken() );
}
return result.toString().trim();
}
}
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