Java Swing - LuaApi

 Java Swing - LuaApi

package jlib5.java;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class LuaApi {

    ScriptEngineManager sem ;
    ScriptEngine e;
    ScriptEngineFactory f;

    public LuaApi() {
        sem = new ScriptEngineManager();
        e = sem.getEngineByName("luaj");
        f = e.getFactory();
    }

    public void showVersion() {
        System.out.println( "Engine name: " +f.getEngineName() );
        System.out.println( "Engine Version: " +f.getEngineVersion() );
        System.out.println( "LanguageName: " +f.getLanguageName() );
        System.out.println( "Language Version: " +f.getLanguageVersion() );
    }

    public void set(String name, int value ) {
        e.put( name, value );
    }

    public Object get(String name) {
        return e.get( name );
    }

    public Object eval(String statement ) {
        try {
            return e.eval(statement);
        } catch (ScriptException ex) {
            ex.printStackTrace();
        }
        return null;
    }


    public boolean checkCondition(String statement) {
        String lua_statement = "if " + statement + " then rv=1 else rv=0 end";
        eval( lua_statement );
        int rv = (int)get("rv");
        return rv != 0;
    }

    public boolean checkJavaCondition(String statement) {
        String lua_statement = statement.replace("&&", " and " )
                .replace( "~=", "!=")
                .replace( "||", " or ");
        return checkCondition(lua_statement);
    }

    public static void main(String[] args) {
        LuaApi lua = new LuaApi();
        lua.showVersion();
        lua.set("a",1);
        lua.set("b",2);
        System.out.println( lua.checkCondition("a == 1 and b == 2") );
        System.out.println( lua.checkCondition("a == 1 and b == 1") );
    }
}