/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.lang.impl;
import org.crsh.lang.spi.Compiler;
import org.crsh.lang.spi.Language;
import org.crsh.lang.spi.Repl;
import org.crsh.plugin.CRaSHPlugin;
import org.crsh.plugin.PluginContext;
import org.crsh.shell.impl.command.ShellSession;
import java.lang.reflect.Constructor;
import java.util.concurrent.atomic.AtomicReference;
/**
* A command manager that is able to load a command manager via reflection.
*
* @author Julien Viet
*/
public class LanguageProxy extends CRaSHPlugin<Language> implements Language {
/** . */
private final AtomicReference<Language> real = new AtomicReference<Language>();
/** . */
private final String name;
/** . */
private final String className;
public LanguageProxy(String name, String className) {
this.name = name;
this.className = className;
}
@Override
public Language getImplementation() {
return this;
}
@Override
public void init() {
try {
Class<Language> mgrClass = (Class<Language>)getClass().getClassLoader().loadClass(className);
Constructor<Language> mgrCtor = mgrClass.getConstructor(PluginContext.class);
Language mgr = mgrCtor.newInstance(getContext());
real.set(mgr);
}
catch (Exception e) {
log.info("Plugin is inactive");
}
catch (NoClassDefFoundError e) {
log.info("Plugin is inactive");
}
}
@Override
public String getName() {
return name;
}
@Override
public String getDisplayName() {
return real.get() != null ? real.get().getDisplayName() : "";
}
@Override
public boolean isActive() {
return real.get() != null;
}
@Override
public Repl getRepl() {
Language lang = real.get();
if (lang != null) {
return lang.getRepl();
} else {
throw new IllegalStateException(name + " language is not available");
}
}
@Override
public Compiler getCompiler() {
Language lang = real.get();
if (lang != null) {
return lang.getCompiler();
} else {
throw new IllegalStateException(name + " language is not available");
}
}
@Override
public void init(ShellSession session) {
Language lang = real.get();
if (lang != null) {
lang.init(session);
} else {
throw new IllegalStateException(name + " language is not available");
}
}
@Override
public void destroy(ShellSession session) {
Language lang = real.get();
if (lang != null) {
lang.destroy(session);
} else {
throw new IllegalStateException(name + " language is not available");
}
}
}