xmlconfiguration.java

jetty SERVER連接資料庫用的軟體

            {
                if ("String".equals(type))
                    aClass = java.lang.String.class;
                else if ("URL".equals(type))
                    aClass = java.net.URL.class;
                else if ("InetAddress".equals(type))
                    aClass = java.net.InetAddress.class;
                else
                    aClass = Loader.loadClass(XmlConfiguration.class, type,true);
            }
        }

        Object al=null;
        
        Iterator iter = node.iterator("Item");
        while(iter.hasNext())
        {
            XmlParser.Node item= (XmlParser.Node)iter.next();
            String nid = item.getAttribute("id");
            Object v = value(obj, item);
            al=LazyList.add(al,(v==null&&aClass.isPrimitive())?ZERO:v);
            if (nid != null) 
                _idMap.put(nid, v);
        }
        
        Object array =  LazyList.toArray(al,aClass);
        if (id != null) 
            _idMap.put(id, array);
        return array; 
    }
    
    /* ------------------------------------------------------------ */
    /*
     * Create a new map object.
     *
     */
    private Object newMap(Object obj, XmlParser.Node node) throws Exception
    {
        String id = node.getAttribute("id");

        Map map = new HashMap();
        if (id != null) _idMap.put(id, map);

        for (int i = 0; i < node.size(); i++)
        {
            Object o = node.get(i);
            if (o instanceof String) continue;
            XmlParser.Node entry = (XmlParser.Node) o;
            if (!entry.getTag().equals("Entry")) throw new IllegalStateException("Not an Entry");
            
            
            XmlParser.Node key=null;
            XmlParser.Node value=null;

            for (int j = 0; j < entry.size(); j++)
            {
                o = entry.get(j);
                if (o instanceof String) continue;
                XmlParser.Node item = (XmlParser.Node) o;
                if (!item.getTag().equals("Item")) throw new IllegalStateException("Not an Item");
                if (key==null) 
                    key=item;
                else
                    value=item;
            }
            
            if (key==null || value==null)
                throw new IllegalStateException("Missing Item in Entry");
            String kid = key.getAttribute("id");
            String vid = value.getAttribute("id");
             
            Object k = value(obj, key);
            Object v = value(obj, value);
            map.put(k,v);
            
            if (kid != null) _idMap.put(kid, k);
            if (vid != null) _idMap.put(vid, v);
        }

        return map;
    }

    /* ------------------------------------------------------------ */
    /*
     * Create a new value object.
     *
     * @param obj @param node @return @exception Exception
     */
    private Object propertyObj(Object obj, XmlParser.Node node) throws Exception
    {
        String id = node.getAttribute("id");
        String name = node.getAttribute("name");
        Object defval = node.getAttribute("default");
        Object prop=null;
        if (_propertyMap!=null && _propertyMap.containsKey(name))
        {
            prop=_propertyMap.get(name);
        }
        else if (defval != null)
            prop=defval;

        if (id != null) 
            _idMap.put(id, prop);
        if (prop!=null)
            configure(prop, node, 0);
        return prop;
    }
    
    /* ------------------------------------------------------------ */
    /*
     * Get the value of an element. If no value type is specified, then white space is trimmed out
     * of the value. If it contains multiple value elements they are added as strings before being
     * converted to any specified type. @param node
     */
    private Object value(Object obj, XmlParser.Node node) throws Exception
    {
        Object value = null;

        // Get the type
        String type = node.getAttribute("type");

        // Try a ref lookup
        String ref = node.getAttribute("ref");
        if (ref != null)
        {
            value = _idMap.get(ref);
        }
        else
        {
            // handle trivial case
            if (node.size() == 0)
            {
                if ("String".equals(type)) return "";
                return null;
            }

            // Trim values
            int first = 0;
            int last = node.size() - 1;

            // Handle default trim type
            if (type == null || !"String".equals(type))
            {
                // Skip leading white
                Object item = null;
                while (first <= last)
                {
                    item = node.get(first);
                    if (!(item instanceof String)) break;
                    item = ((String) item).trim();
                    if (((String) item).length() > 0) break;
                    first++;
                }

                // Skip trailing white
                while (first < last)
                {
                    item = node.get(last);
                    if (!(item instanceof String)) break;
                    item = ((String) item).trim();
                    if (((String) item).length() > 0) break;
                    last--;
                }

                // All white, so return null
                if (first > last) return null;
            }

            if (first == last)
                //  Single Item value
                value = itemValue(obj, node.get(first));
            else
            {
                // Get the multiple items as a single string
                StringBuffer buf = new StringBuffer();
                synchronized (buf)
                {
                    for (int i = first; i <= last; i++)
                    {
                        Object item = node.get(i);
                        buf.append(itemValue(obj, item));
                    }
                    value = buf.toString();
                }
            }
        }

        // Untyped or unknown
        if (value == null)
        {
            if ("String".equals(type)) return "";
            return null;
        }

        // Try to type the object
        if (type == null)
        {
            if (value != null && value instanceof String) return ((String) value).trim();
            return value;
        }

        if ("String".equals(type) || "java.lang.String".equals(type)) return value.toString();

        Class pClass = TypeUtil.fromName(type);
        if (pClass != null) return TypeUtil.valueOf(pClass, value.toString());

        if ("URL".equals(type) || "java.net.URL".equals(type))
        {
            if (value instanceof URL) return value;
            try
            {
                return new URL(value.toString());
            }
            catch (MalformedURLException e)
            {
                throw new InvocationTargetException(e);
            }
        }

        if ("InetAddress".equals(type) || "java.net.InetAddress".equals(type))
        {
            if (value instanceof InetAddress) return value;
            try
            {
                return InetAddress.getByName(value.toString());
            }
            catch (UnknownHostException e)
            {
                throw new InvocationTargetException(e);
            }
        }

        throw new IllegalStateException("Unknown type " + type);
    }

    /* ------------------------------------------------------------ */
    /*
     * Get the value of a single element. @param obj @param item @return @exception Exception
     */
    private Object itemValue(Object obj, Object item) throws Exception
    {
        // String value
        if (item instanceof String) return item;

        XmlParser.Node node = (XmlParser.Node) item;
        String tag = node.getTag();
        if ("Call".equals(tag)) return call(obj, node);
        if ("Get".equals(tag)) return get(obj, node);
        if ("New".equals(tag)) return newObj(obj, node);
        if ("Ref".equals(tag)) return refObj(obj, node);
        if ("Array".equals(tag)) return newArray(obj, node);
        if ("Map".equals(tag)) return newMap(obj, node);
        if ("Property".equals(tag)) return propertyObj(obj,node);

        if ("SystemProperty".equals(tag))
        {
            String name = node.getAttribute("name");
            String defaultValue = node.getAttribute("default");
            return System.getProperty(name, defaultValue);
        }
        
        Log.warn("Unknown value tag: " + node, new Throwable());
        return null;
    }

    /* ------------------------------------------------------------ */
    /* ------------------------------------------------------------ */
    /* ------------------------------------------------------------ */
    /* ------------------------------------------------------------ */
    /** 
     * Run the XML configurations as a main application.
     * The command line is used to obtain properties files (must be named '*.properties') and XmlConfiguration
     * files.
     * <p>
     * Any property file on the command line is added to a combined Property instance that is passed to
     * each configuration file via {@link XmlConfiguration#setProperties(Map)}.
     * <p>
     * Each configuration file on the command line is used to create a new XmlConfiguration instance and the
     * {@link XmlConfiguration#configure()} method is used to create the configured object.  If the resulting 
     * object is an instance of {@link LifeCycle}, then it is started.
     * <p>
     * Any IDs created in a configuration are passed to the next configuration file on the command line using
     * {@link #getIdMap()} and {@link #setIdMap(Map)}. This allows objects with IDs created in one config file to
     * be referenced in subsequent config files on the command line.
     * 
     * @param args array of property and xml configuration filenames or {@link Resource}s.
     */
    public static void main(String[] args)
    {
        try
        {
            Properties properties=new Properties();
            XmlConfiguration last=null;
            Object[] obj = new Object[args.length];
            for (int i = 0; i < args.length; i++)
            {
                if (args[i].toLowerCase().endsWith(".properties"))
                {
                    properties.load(Resource.newResource(args[i]).getInputStream());
                }
                else
                {
                    XmlConfiguration configuration = new XmlConfiguration(Resource.newResource(args[i]).getURL());
                    if (last!=null)
                        configuration.getIdMap().putAll(last.getIdMap());
                    if (properties.size()>0)
                        configuration.setProperties(properties);
                    obj[i] = configuration.configure();
                    last=configuration;
                }
            }

            for (int i = 0; i < args.length; i++)
            {
                if (obj[i] instanceof LifeCycle)
                {
                    LifeCycle lc = (LifeCycle)obj[i];
                    if (!lc.isRunning())
                        lc.start();
                }
            }
        }
        catch (Exception e)
        {
            Log.warn(Log.EXCEPTION, e);
        }
        
    }
    
}