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XmlConfiguration.java

// ========================================================================
// $Id: XmlConfiguration.java,v 1.28 2005/08/13 08:12:14 gregwilkins Exp $
// Copyright 1999-2004 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at 
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================

package org.mortbay.xml;

import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.mortbay.log.LogFactory;
import org.mortbay.util.InetAddrPort;
import org.mortbay.util.Loader;
import org.mortbay.util.LogSupport;
import org.mortbay.util.Resource;
import org.mortbay.util.TypeUtil;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/* ------------------------------------------------------------ */
/**
 * Configure Objects from XML. This class reads an XML file conforming to the configure.dtd DTD and
 * uses it to configure and object by calling set, put or other methods on the object.
 * 
 * @version $Id: XmlConfiguration.java,v 1.28 2005/08/13 08:12:14 gregwilkins Exp $
 * @author Greg Wilkins (gregw)
 */
00052 public class XmlConfiguration
{
    private static Log log = LogFactory.getLog(XmlConfiguration.class);

    private static Class[] __primitives = { Boolean.TYPE, Character.TYPE, Byte.TYPE, Short.TYPE,
            Integer.TYPE, Long.TYPE, Float.TYPE, Double.TYPE, Void.TYPE};

    private static Class[] __primitiveHolders = { Boolean.class, Character.class, Byte.class,
            Short.class, Integer.class, Long.class, Float.class, Double.class, Void.class};

    /* ------------------------------------------------------------ */
    private static XmlParser __parser;
    private XmlParser.Node _config;
    private Map _idMap = new HashMap();

    /* ------------------------------------------------------------ */
    private synchronized static void initParser() throws IOException
    {
        if (__parser != null) return;

        __parser = new XmlParser();
        URL config13URL = XmlConfiguration.class.getClassLoader().getResource(
                "org/mortbay/xml/configure_1_3.dtd");
        __parser.redirectEntity("configure.dtd", config13URL);
        __parser.redirectEntity("configure_1_3.dtd", config13URL);
        __parser.redirectEntity("http://jetty.mortbay.org/configure_1_3.dtd", config13URL);
        __parser.redirectEntity("http://jetty.mortbay.org/configure.dtd", config13URL);
        __parser.redirectEntity("-//Mort Bay Consulting//DTD Configure 1.3//EN", config13URL);
        __parser.redirectEntity("-//Mort Bay Consulting//DTD Configure//EN", config13URL);

        URL config12URL = XmlConfiguration.class.getClassLoader().getResource(
                "org/mortbay/xml/configure_1_2.dtd");
        __parser.redirectEntity("configure_1_2.dtd", config12URL);
        __parser.redirectEntity("http://jetty.mortbay.org/configure_1_2.dtd", config12URL);
        __parser.redirectEntity("-//Mort Bay Consulting//DTD Configure 1.2//EN", config12URL);

        URL config11URL = XmlConfiguration.class.getClassLoader().getResource(
                "org/mortbay/xml/configure_1_1.dtd");
        __parser.redirectEntity("configure_1_1.dtd", config11URL);
        __parser.redirectEntity("http://jetty.mortbay.org/configure_1_1.dtd", config11URL);
        __parser.redirectEntity("-//Mort Bay Consulting//DTD Configure 1.1//EN", config11URL);

        URL config10URL = XmlConfiguration.class.getClassLoader().getResource(
                "org/mortbay/xml/configure_1_0.dtd");
        __parser.redirectEntity("configure_1_0.dtd", config10URL);
        __parser.redirectEntity("http://jetty.mortbay.org/configure_1_0.dtd", config10URL);
        __parser.redirectEntity("-//Mort Bay Consulting//DTD Configure 1.0//EN", config10URL);
    }

    /* ------------------------------------------------------------ */
    /**
     * Constructor. Reads the XML configuration file.
     * 
     * @param configuration
     */
00107     public XmlConfiguration(URL configuration) throws SAXException, IOException
    {
        initParser();
        synchronized (__parser)
        {
            _config = __parser.parse(configuration.toString());
        }
    }

    /* ------------------------------------------------------------ */
    /**
     * Constructor.
     * 
     * @param configuration String of XML configuration commands excluding the normal XML preamble.
     *            The String should start with a " <Configure ...." element.
     * @exception SAXException
     * @exception IOException
     */
00125     public XmlConfiguration(String configuration) throws SAXException, IOException
    {
        initParser();
        configuration = "<?xml version=\"1.0\"  encoding=\"ISO-8859-1\"?>\n<!DOCTYPE Configure PUBLIC \"-//Mort Bay Consulting//DTD Configure 1.2//EN\" \"http://jetty.mortbay.org/configure_1_2.dtd\">"
                + configuration;
        InputSource source = new InputSource(new StringReader(configuration));
        synchronized (__parser)
        {
            _config = __parser.parse(source);
        }
    }

    /* ------------------------------------------------------------ */
    /**
     * Constructor.
     * 
     * @param configuration An input stream containing a complete e.g. configuration file
     * @exception SAXException
     * @exception IOException
     */
00145     public XmlConfiguration(InputStream configuration) throws SAXException, IOException
    {
        initParser();
        InputSource source = new InputSource(configuration);
        synchronized (__parser)
        {
            _config = __parser.parse(source);
        }
    }

    /* ------------------------------------------------------------ */
    /**
     * Configure an object. If the object is of the approprate class, the XML configuration script
     * is applied to the object.
     * 
     * @param obj The object to be configured.
     * @exception ClassNotFoundException
     * @exception NoSuchMethodException
     * @exception InvocationTargetException
     * @throws IllegalAccessException
     * @throws InstantiationException
     */
00167     public void configure(Object obj) throws ClassNotFoundException, NoSuchMethodException,
            InvocationTargetException, InstantiationException, IllegalAccessException
    {
        //Check the class of the object
        Class oClass = nodeClass(_config);
        if (oClass != null)
        {
            if (obj != null && !oClass.isInstance(obj))
                    throw new IllegalArgumentException("Object is not of type " + oClass);
            if (obj == null) obj = oClass.newInstance();
        }
        configure(obj, _config, 0);
    }

    /* ------------------------------------------------------------ */
    /**
     * Create a new object and configure it. A new object is created and configured.
     * 
     * @return The newly created configured object.
     * @exception ClassNotFoundException
     * @exception NoSuchMethodException
     * @exception InvocationTargetException
     * @exception InstantiationException
     * @exception IllegalAccessException
     */
00192     public Object newInstance() throws ClassNotFoundException, NoSuchMethodException,
            InvocationTargetException, InstantiationException, IllegalAccessException
    {
        Class oClass = nodeClass(_config);
        Object obj = null;
        if (oClass != null) obj = oClass.newInstance();
        configure(obj, _config, 0);
        return obj;
    }

    /* ------------------------------------------------------------ */
    private Class nodeClass(XmlParser.Node node) throws ClassNotFoundException
    {
        String className = node.getAttribute("class");
        if (className == null) return null;

        return Loader.loadClass(XmlConfiguration.class, className);
    }

    /* ------------------------------------------------------------ */
    /*
     * Recursive configuration step. This method applies the remaining Set, Put and Call elements to
     * the current object. @param obj @param cfg @param i @exception ClassNotFoundException
     * @exception NoSuchMethodException @exception InvocationTargetException
     */
    private void configure(Object obj, XmlParser.Node cfg, int i) throws ClassNotFoundException,
            NoSuchMethodException, InvocationTargetException, IllegalAccessException
    {
        XmlParser.Node node = null;
        try
        {
            for (; i < cfg.size(); i++)
            {
                Object o = cfg.get(i);
                if (o instanceof String) continue;
                node = (XmlParser.Node) o;

                String tag = node.getTag();
                if ("Set".equals(tag))
                    set(obj, node);
                else if ("Put".equals(tag))
                    put(obj, node);
                else if ("Call".equals(tag))
                    call(obj, node);
                else if ("Get".equals(tag))
                    get(obj, node);
                else if ("New".equals(tag))
                    newObj(obj, node);
                else if ("Ref".equals(tag))
                    refObj(obj, node);
                else
                    throw new IllegalStateException("Unknown tag: " + tag);
            }
        }
        catch(InvocationTargetException e)
        {
            log.warn("Exception at "+node.toString(),e.getTargetException());
            throw e;
        }
        catch (Error e)
        {
            log.debug(node);
            throw e;
        }
        catch (Exception e)
        {
            log.debug(node);
            if (e instanceof NoSuchMethodException) throw (NoSuchMethodException) e;
            if (e instanceof InvocationTargetException) throw (InvocationTargetException) e;
            if (e instanceof IllegalAccessException) throw (IllegalAccessException) e;
            if (e instanceof RuntimeException) throw (RuntimeException) e;
        }
    }

    /* ------------------------------------------------------------ */
    /*
     * Call a set method. This method makes a best effort to find a matching set method. The type of
     * the value is used to find a suitable set method by 1. Trying for a trivial type match. 2.
     * Looking for a native type match. 3. Trying all correctly named methods for an auto
     * conversion. 4. Attempting to construct a suitable value from original value. @param obj
     * @param node
     */
    private void set(Object obj, XmlParser.Node node) throws ClassNotFoundException,
            NoSuchMethodException, InvocationTargetException, IllegalAccessException
    {
        String attr = node.getAttribute("name");
        String name = "set" + attr.substring(0, 1).toUpperCase() + attr.substring(1);
        Object value = value(obj, node);
        Object[] arg = { value};

        Class oClass = nodeClass(node);
        if (oClass != null)
            obj = null;
        else
            oClass = obj.getClass();

        Class[] vClass = { Object.class};
        if (value != null) vClass[0] = value.getClass();

        if (log.isDebugEnabled())
                log.debug(obj + "." + name + "(" + vClass[0] + " " + value + ")");

        // Try for trivial match
        try
        {
            Method set = oClass.getMethod(name, vClass);
            set.invoke(obj, arg);
            return;
        }
        catch (IllegalArgumentException e)
        {
            LogSupport.ignore(log, e);
        }
        catch (IllegalAccessException e)
        {
            LogSupport.ignore(log, e);
        }
        catch (NoSuchMethodException e)
        {
            LogSupport.ignore(log, e);
        }

        // Try for native match
        try
        {
            Field type = vClass[0].getField("TYPE");
            vClass[0] = (Class) type.get(null);
            Method set = oClass.getMethod(name, vClass);
            set.invoke(obj, arg);
            return;
        }
        catch (NoSuchFieldException e)
        {
            LogSupport.ignore(log, e);
        }
        catch (IllegalArgumentException e)
        {
            LogSupport.ignore(log, e);
        }
        catch (IllegalAccessException e)
        {
            LogSupport.ignore(log, e);
        }
        catch (NoSuchMethodException e)
        {
            LogSupport.ignore(log, e);
        }

        // Try a field
        try
        {
            Field field = oClass.getField(attr);
            if (Modifier.isPublic(field.getModifiers()))
            {
                field.set(obj, value);
                return;
            }
        }
        catch (NoSuchFieldException e)
        {
            LogSupport.ignore(log, e);
        }

        // Search for a match by trying all the set methods
        Method[] sets = oClass.getMethods();
        Method set = null;
        for (int s = 0; sets != null && s < sets.length; s++)
        {
            if (name.equals(sets[s].getName()) && sets[s].getParameterTypes().length == 1)
            {
                // lets try it
                try
                {
                    set = sets[s];
                    sets[s].invoke(obj, arg);
                    return;
                }
                catch (IllegalArgumentException e)
                {
                    LogSupport.ignore(log, e);
                }
                catch (IllegalAccessException e)
                {
                    LogSupport.ignore(log, e);
                }
            }
        }

        // Try converting the arg to the last set found.
        if (set != null)
        {
            try
            {
                Class sClass = set.getParameterTypes()[0];
                if (sClass.isPrimitive())
                {
                    for (int t = 0; t < __primitives.length; t++)
                    {
                        if (sClass.equals(__primitives[t]))
                        {
                            sClass = __primitiveHolders[t];
                            break;
                        }
                    }
                }
                Constructor cons = sClass.getConstructor(vClass);
                arg[0] = cons.newInstance(arg);
                set.invoke(obj, arg);
                return;
            }
            catch (NoSuchMethodException e)
            {
                LogSupport.ignore(log, e);
            }
            catch (IllegalAccessException e)
            {
                LogSupport.ignore(log, e);
            }
            catch (InstantiationException e)
            {
                LogSupport.ignore(log, e);
            }
        }

        // No Joy
        throw new NoSuchMethodException(oClass + "." + name + "(" + vClass[0] + ")");
    }

    /* ------------------------------------------------------------ */
    /*
     * Call a put method.
     * 
     * @param obj @param node
     */
    private void put(Object obj, XmlParser.Node node) throws NoSuchMethodException,
            ClassNotFoundException, InvocationTargetException, IllegalAccessException
    {
        if (!(obj instanceof Map))
                throw new IllegalArgumentException("Object for put is not a Map: " + obj);
        Map map = (Map) obj;

        String name = node.getAttribute("name");
        Object value = value(obj, node);
        map.put(name, value);
        if (log.isDebugEnabled()) log.debug(obj + ".put(" + name + "+" + value + ")");
    }

    /* ------------------------------------------------------------ */
    /*
     * Call a get method. Any object returned from the call is passed to the configure method to
     * consume the remaining elements. @param obj @param node @return @exception
     * NoSuchMethodException @exception ClassNotFoundException @exception InvocationTargetException
     */
    private Object get(Object obj, XmlParser.Node node) throws NoSuchMethodException,
            ClassNotFoundException, InvocationTargetException, IllegalAccessException
    {
        Class oClass = nodeClass(node);
        if (oClass != null)
            obj = null;
        else
            oClass = obj.getClass();

        String name = node.getAttribute("name");
        String id = node.getAttribute("id");
        if (log.isDebugEnabled()) log.debug("get " + name);

        try
        {
            // try calling a getXxx method.
            Method method = oClass.getMethod("get" + name.substring(0, 1).toUpperCase()
                    + name.substring(1), (java.lang.Class[]) null);
            obj = method.invoke(obj, (java.lang.Object[]) null);
            configure(obj, node, 0);
        }
        catch (NoSuchMethodException nsme)
        {
            try
            {
                Field field = oClass.getField(name);
                obj = field.get(obj);
                configure(obj, node, 0);
            }
            catch (NoSuchFieldException nsfe)
            {
                throw nsme;
            }
        }
        if (id != null) _idMap.put(id, obj);
        return obj;
    }

    /* ------------------------------------------------------------ */
    /*
     * Call a method. A method is selected by trying all methods with matching names and number of
     * arguments. Any object returned from the call is passed to the configure method to consume the
     * remaining elements. Note that if this is a static call we consider only methods declared
     * directly in the given class. i.e. we ignore any static methods in superclasses. @param obj
     * @param node @return @exception NoSuchMethodException @exception ClassNotFoundException
     * @exception InvocationTargetException
     */
    private Object call(Object obj, XmlParser.Node node) throws NoSuchMethodException,
            ClassNotFoundException, InvocationTargetException, IllegalAccessException
    {
        String id = node.getAttribute("id");
        Class oClass = nodeClass(node);
        if (oClass != null)
            obj = null;
        else if (obj != null) oClass = obj.getClass();
        if (oClass == null) throw new IllegalArgumentException(node.toString());

        int size = 0;
        int argi = node.size();
        for (int i = 0; i < node.size(); i++)
        {
            Object o = node.get(i);
            if (o instanceof String) continue;
            if (!((XmlParser.Node) o).getTag().equals("Arg"))
            {
                argi = i;
                break;
            }
            size++;
        }

        Object[] arg = new Object[size];
        for (int i = 0, j = 0; j < size; i++)
        {
            Object o = node.get(i);
            if (o instanceof String) continue;
            arg[j++] = value(obj, (XmlParser.Node) o);
        }

        String method = node.getAttribute("name");
        if (log.isDebugEnabled()) log.debug("call " + method);

        // Lets just try all methods for now
        Method[] methods = oClass.getMethods();
        for (int c = 0; methods != null && c < methods.length; c++)
        {
            if (!methods[c].getName().equals(method)) continue;
            if (methods[c].getParameterTypes().length != size) continue;
            if (Modifier.isStatic(methods[c].getModifiers()) != (obj == null)) continue;
            if ((obj == null) && methods[c].getDeclaringClass() != oClass) continue;

            Object n = null;
            boolean called = false;
            try
            {
                n = methods[c].invoke(obj, arg);
                called = true;
            }
            catch (IllegalAccessException e)
            {
                LogSupport.ignore(log, e);
            }
            catch (IllegalArgumentException e)
            {
                LogSupport.ignore(log, e);
            }
            if (called)
            {
                if (id != null) _idMap.put(id, n);
                configure(n, node, argi);
                return n;
            }
        }

        throw new IllegalStateException("No Method: " + node + " on " + oClass);
    }

    /* ------------------------------------------------------------ */
    /*
     * Create a new value object.
     * 
     * @param obj @param node @return @exception NoSuchMethodException @exception
     * ClassNotFoundException @exception InvocationTargetException
     */
    private Object newObj(Object obj, XmlParser.Node node) throws NoSuchMethodException,
            ClassNotFoundException, InvocationTargetException, IllegalAccessException
    {
        Class oClass = nodeClass(node);
        String id = node.getAttribute("id");
        int size = 0;
        int argi = node.size();
        for (int i = 0; i < node.size(); i++)
        {
            Object o = node.get(i);
            if (o instanceof String) continue;
            if (!((XmlParser.Node) o).getTag().equals("Arg"))
            {
                argi = i;
                break;
            }
            size++;
        }

        Object[] arg = new Object[size];
        for (int i = 0, j = 0; j < size; i++)
        {
            Object o = node.get(i);
            if (o instanceof String) continue;
            arg[j++] = value(obj, (XmlParser.Node) o);
        }

        if (log.isDebugEnabled()) log.debug("new " + oClass);

        // Lets just try all constructors for now
        Constructor[] constructors = oClass.getConstructors();
        for (int c = 0; constructors != null && c < constructors.length; c++)
        {
            if (constructors[c].getParameterTypes().length != size) continue;

            Object n = null;
            boolean called = false;
            try
            {
                n = constructors[c].newInstance(arg);
                called = true;
            }
            catch (IllegalAccessException e)
            {
                LogSupport.ignore(log, e);
            }
            catch (InstantiationException e)
            {
                LogSupport.ignore(log, e);
            }
            catch (IllegalArgumentException e)
            {
                LogSupport.ignore(log, e);
            }
            if (called)
            {
                if (id != null) _idMap.put(id, n);
                configure(n, node, argi);
                return n;
            }
        }

        throw new IllegalStateException("No Constructor: " + node + " on " + obj);
    }

    /* ------------------------------------------------------------ */
    /*
     * Reference an id value object.
     * 
     * @param obj @param node @return @exception NoSuchMethodException @exception
     * ClassNotFoundException @exception InvocationTargetException
     */
    private Object refObj(Object obj, XmlParser.Node node) throws NoSuchMethodException,
            ClassNotFoundException, InvocationTargetException, IllegalAccessException
    {
        String id = node.getAttribute("id");
        obj = _idMap.get(id);
        if (obj == null) throw new IllegalStateException("No object for id=" + id);
        configure(obj, node, 0);
        return obj;
    }

    /* ------------------------------------------------------------ */
    /*
     * Create a new array object.
     * 
     * @param obj @param node @return @exception NoSuchMethodException @exception
     * ClassNotFoundException @exception InvocationTargetException
     */
    private Object newArray(Object obj, XmlParser.Node node) throws NoSuchMethodException,
            ClassNotFoundException, InvocationTargetException, IllegalAccessException
    {
        // Get the type
        Class aClass = java.lang.Object.class;
        String type = node.getAttribute("type");
        String id = node.getAttribute("id");
        if (type != null)
        {
            aClass = TypeUtil.fromName(type);
            if (aClass == null)
            {
                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 if ("InetAddrPort".equals(type))
                    aClass = org.mortbay.util.InetAddrPort.class;
                else
                    aClass = Loader.loadClass(XmlConfiguration.class, type);
            }
        }

        Object array = Array.newInstance(aClass, node.size());
        if (id != null) _idMap.put(id, obj);

        for (int i = 0; i < node.size(); i++)
        {
            Object o = node.get(i);
            if (o instanceof String) continue;
            XmlParser.Node item = (XmlParser.Node) o;
            if (!item.getTag().equals("Item")) throw new IllegalStateException("Not an Item");
            id = item.getAttribute("id");
            Object v = value(obj, item);
            if (v != null) Array.set(array, i, v);
            if (id != null) _idMap.put(id, v);
        }

        return array;
    }

    /* ------------------------------------------------------------ */
    /*
     * 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 NoSuchMethodException,
            ClassNotFoundException, InvocationTargetException, IllegalAccessException
    {
        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);
            }
        }

        if ("InetAddrPort".equals(type) || "org.mortbay.util.InetAddrPort".equals(type))
        {
            if (value instanceof InetAddrPort) return value;
            try
            {
                return new InetAddrPort(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
     * ClassNotFoundException
     */
    private Object itemValue(Object obj, Object item) throws NoSuchMethodException,
            ClassNotFoundException, InvocationTargetException, IllegalAccessException
    {
        // 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 ("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;
    }

    /* ------------------------------------------------------------ */
    /* ------------------------------------------------------------ */
    /* ------------------------------------------------------------ */
    public static void main(String[] arg)
    {
        try
        {
            for (int i = 0; i < arg.length; i++)
                new XmlConfiguration(Resource.newResource(arg[i]).getURL()).newInstance();
        }
        catch (Exception e)
        {
            log.warn(LogSupport.EXCEPTION, e);
        }
    }
}


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