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/*******************************************************************************
* Copyright (c) 2003, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.framework.internal.core;
import java.io.*;
import java.util.Hashtable;
import java.util.Vector;
import org.eclipse.osgi.framework.debug.Debug;
/**
* This class maps aliases.
*/
public class AliasMapper {
private static Hashtable processorAliasTable;
private static Hashtable osnameAliasTable;
/**
* Constructor.
*
*/
public AliasMapper() {
}
/**
* Return the master alias for the processor.
*
* @param processor Input name
* @return aliased name (if any)
*/
public String aliasProcessor(String processor) {
processor = processor.toLowerCase();
if (processorAliasTable == null) {
InputStream in = getClass().getResourceAsStream(Constants.OSGI_PROCESSOR_ALIASES);
if (in != null) {
try {
processorAliasTable = initAliases(in);
} finally {
try {
in.close();
} catch (IOException ee) {
}
}
}
}
if (processorAliasTable != null) {
String alias = (String) processorAliasTable.get(processor);
if (alias != null) {
processor = alias;
}
}
return (processor);
}
/**
* Return the master alias for the osname.
*
* @param osname Input name
* @return aliased name (if any)
*/
public Object aliasOSName(String osname) {
osname = osname.toLowerCase();
if (osnameAliasTable == null) {
InputStream in = getClass().getResourceAsStream(Constants.OSGI_OSNAME_ALIASES);
if (in != null) {
try {
osnameAliasTable = initAliases(in);
} finally {
try {
in.close();
} catch (IOException ee) {
}
}
}
}
if (osnameAliasTable != null) {
Object aliasObject = osnameAliasTable.get(osname);
//String alias = (String) osnameAliasTable.get(osname);
if (aliasObject != null)
if (aliasObject instanceof String) {
osname = (String) aliasObject;
} else {
return (Vector) aliasObject;
}
}
return (osname);
}
/**
* Read alias data and populate a Hashtable.
*
* @param in InputStream from which to read alias data.
* @return Hashtable of aliases.
*/
protected static Hashtable initAliases(InputStream in) {
Hashtable aliases = new Hashtable(37);
try {
BufferedReader br;
try {
br = new BufferedReader(new InputStreamReader(in, "UTF8")); //$NON-NLS-1$
} catch (UnsupportedEncodingException e) {
br = new BufferedReader(new InputStreamReader(in));
}
while (true) {
String line = br.readLine();
if (line == null) /* EOF */{
break; /* done */
}
Tokenizer tokenizer = new Tokenizer(line);
String master = tokenizer.getString("# \t"); //$NON-NLS-1$
if (master != null) {
aliases.put(master.toLowerCase(), master);
parseloop: while (true) {
String alias = tokenizer.getString("# \t"); //$NON-NLS-1$
if (alias == null) {
break parseloop;
}
String lowerCaseAlias = alias.toLowerCase();
Object storedMaster = aliases.get(lowerCaseAlias);
if (storedMaster == null) {
aliases.put(lowerCaseAlias, master);
} else if (storedMaster instanceof String) {
Vector newMaster = new Vector();
newMaster.add(storedMaster);
newMaster.add(master);
aliases.put(lowerCaseAlias, newMaster);
} else {
((Vector) storedMaster).add(master);
aliases.put(lowerCaseAlias, storedMaster);
}
}
}
}
} catch (IOException e) {
if (Debug.DEBUG && Debug.DEBUG_GENERAL) {
Debug.printStackTrace(e);
}
}
return (aliases);
}
}
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