php/ext/java/reflect.java

/*
   +----------------------------------------------------------------------+
   | PHP version 4.0                                                      |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997, 1998, 1999 The PHP Group                         |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.0 of the PHP license,       |
   | that is bundled with this package in the file LICENSE, and is        |
   | available at through the world-wide-web at                           |
   | http://www.php.net/license.html.                                     |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Author: Sam Ruby (rubys@us.ibm.com)                                  |
   +----------------------------------------------------------------------+
 */

package net.php;

import java.lang.reflect.*;
import java.util.ResourceBundle;
import java.beans.*;

class reflect {

  static { loadLibrary("reflect"); }
  
  protected static void loadLibrary(String property) {
    try {
      ResourceBundle bundle = ResourceBundle.getBundle("net.php."+property);
      System.loadLibrary(bundle.getString("library"));
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  //
  // Native methods
  //
  private static native void setResultFromString(long result, String value);
  private static native void setResultFromLong(long result, long value);
  private static native void setResultFromDouble(long result, double value);
  private static native void setResultFromBoolean(long result, boolean value);
  private static native void setResultFromObject(long result, Object value);
  private static native void setException(long result, String value);
  public  static native void setEnv();

  //
  // Helper routines which encapsulate the native methods
  //
  static void setResult(long result, Object value) {
    if (value == null) return;

    if (value instanceof java.lang.String) {

      setResultFromString(result, (String)value);

    } else if (value instanceof java.lang.Number) {

       if (value instanceof java.lang.Integer ||
           value instanceof java.lang.Short ||
           value instanceof java.lang.Byte) {
         setResultFromLong(result, ((Number)value).longValue());
       } else {
         /* Float, Double, BigDecimal, BigInteger, Double, Long, ... */
         setResultFromDouble(result, ((Number)value).doubleValue());
       }

    } else if (value instanceof java.lang.Boolean) {

      setResultFromBoolean(result, ((Boolean)value).booleanValue());

    } else {

      setResultFromObject(result, value);

    }
  }

  static void setException(long result, Throwable e) {
    if (e instanceof InvocationTargetException) {
      Throwable t = ((InvocationTargetException)e).getTargetException();
      if (t!=null) e=t;
    }

    setException(result, e.toString());
  }

  //
  // Create an new instance of a given class
  //
  public static void CreateObject(String name, Object args[], long result) {
    try {
      Constructor cons[] = Class.forName(name).getConstructors();
      for (int i=0; i<cons.length; i++) {
        if (cons[i].getParameterTypes().length == args.length) {
          setResult(result, cons[i].newInstance(args));
          return;
        }
      }

      // for classes which have no visible constructor, return the class
      // useful for classes like java.lang.System and java.util.Calendar.
      if (args.length == 0) {
        setResult(result, Class.forName(name));
        return;
      }

      throw new InstantiationException("No matching constructor found");

    } catch (Exception e) {
      setException(result, e);
    }
  }

  //
  // Invoke a method on a given object
  //
  public static void Invoke
    (Object object, String method, Object args[], long result)
  {
    try {

      for (Class jclass = object.getClass();;jclass=(Class)object) {
        Method methods[] = jclass.getMethods();
        for (int i=0; i<methods.length; i++) {
          if (methods[i].getName().equalsIgnoreCase(method) &&
              methods[i].getParameterTypes().length == args.length) {
            setResult(result, methods[i].invoke(object, args));
            return;
          }
        }

        // try a second time with the object itself, if it is of type Class
        if (!(jclass instanceof Class) || (jclass==object)) break;
      }

      throw new NoSuchMethodException(method);

    } catch (Exception e) {
      setException(result, e);
    }
  }

  //
  // Get or Set a property
  //
  public static void GetSetProp
    (Object object, String prop, Object args[], long result)
  {
    try {

      for (Class jclass = object.getClass();;jclass=(Class)object) {
        BeanInfo beanInfo = Introspector.getBeanInfo(jclass);
        PropertyDescriptor props[] = beanInfo.getPropertyDescriptors();
        for (int i=0; i<props.length; i++) {
          if (props[i].getName().equalsIgnoreCase(prop)) {
            Method method;
            if (args!=null && args.length>0) {
              method=props[i].getWriteMethod();
            } else {
              method=props[i].getReadMethod();
            }
            setResult(result, method.invoke(object, args));
            return;
          }
        }

        Field jfields[] = jclass.getFields();
        for (int i=0; i<jfields.length; i++) {
          if (jfields[i].getName().equalsIgnoreCase(prop)) {
            if (args!=null && args.length>0) {
              jfields[i].set(object, args[0]);
            } else {
              setResult(result, jfields[i].get(object));
            }
            return;
          }
        }

        // try a second time with the object itself, if it is of type Class
        if (!(jclass instanceof Class) || (jclass==object)) break;
      }

    } catch (Exception e) {
      setException(result, e);
    }
  }

  //
  // Helper routines for the C implementation
  //
  public static Object MakeArg(boolean b) { return new Boolean(b); }
  public static Object MakeArg(long l)    { return new Long(l); }
  public static Object MakeArg(double d)  { return new Double(d); }
}