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+/* java.lang.reflect.Method - reflection of Java methods
+   Copyright (C) 1998, 2001, 2002 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.lang.reflect;
+
+import java.util.Arrays;
+
+/**
+ * The Method class represents a member method of a class. It also allows
+ * dynamic invocation, via reflection. This works for both static and
+ * instance methods. Invocation on Method objects knows how to do
+ * widening conversions, but throws {@link IllegalArgumentException} if
+ * a narrowing conversion would be necessary. You can query for information
+ * on this Method regardless of location, but invocation access may be limited
+ * by Java language access controls. If you can't do it in the compiler, you
+ * can't normally do it here either.<p>
+ *
+ * <B>Note:</B> This class returns and accepts types as Classes, even
+ * primitive types; there are Class types defined that represent each
+ * different primitive type.  They are <code>java.lang.Boolean.TYPE,
+ * java.lang.Byte.TYPE,</code>, also available as <code>boolean.class,
+ * byte.class</code>, etc.  These are not to be confused with the
+ * classes <code>java.lang.Boolean, java.lang.Byte</code>, etc., which are
+ * real classes.<p>
+ *
+ * Also note that this is not a serializable class.  It is entirely feasible
+ * to make it serializable using the Externalizable interface, but this is
+ * on Sun, not me.
+ *
+ * @author John Keiser
+ * @author Eric Blake <ebb9@email.byu.edu>
+ * @see Member
+ * @see Class
+ * @see java.lang.Class#getMethod(String,Object[])
+ * @see java.lang.Class#getDeclaredMethod(String,Object[])
+ * @see java.lang.Class#getMethods()
+ * @see java.lang.Class#getDeclaredMethods()
+ * @since 1.1
+ * @status updated to 1.4
+ */
+public final class Method
+extends AccessibleObject implements Member
+{
+  Class declaringClass;
+  String name;
+  int slot;
+
+  /**
+   * This class is uninstantiable.
+   */
+  private Method(Class declaringClass, String name, int slot)
+  {
+    this.declaringClass = declaringClass;
+    this.name = name;
+    this.slot = slot;
+  }
+
+  /**
+   * Gets the class that declared this method, or the class where this method
+   * is a non-inherited member.
+   * @return the class that declared this member
+   */
+  public Class getDeclaringClass()
+  {
+    return declaringClass;
+  }
+
+  /**
+   * Gets the name of this method.
+   * @return the name of this method
+   */
+  public String getName()
+  {
+    return name;
+  }
+
+  /**
+   * Gets the modifiers this method uses.  Use the <code>Modifier</code>
+   * class to interpret the values.  A method can only have a subset of the
+   * following modifiers: public, private, protected, abstract, static,
+   * final, synchronized, native, and strictfp.
+   *
+   * @return an integer representing the modifiers to this Member
+   * @see Modifier
+   */
+  public native int getModifiers();
+
+  /**
+   * Gets the return type of this method.
+   * @return the type of this method
+   */
+  public native Class getReturnType();
+
+  /**
+   * Get the parameter list for this method, in declaration order. If the
+   * method takes no parameters, returns a 0-length array (not null).
+   *
+   * @return a list of the types of the method's parameters
+   */
+  public native Class[] getParameterTypes();
+
+  /**
+   * Get the exception types this method says it throws, in no particular
+   * order. If the method has no throws clause, returns a 0-length array
+   * (not null).
+   *
+   * @return a list of the types in the method's throws clause
+   */
+  public native Class[] getExceptionTypes();
+
+  /**
+   * Compare two objects to see if they are semantically equivalent.
+   * Two Methods are semantically equivalent if they have the same declaring
+   * class, name, parameter list, and return type.
+   *
+   * @param o the object to compare to
+   * @return <code>true</code> if they are equal; <code>false</code> if not
+   */
+  public boolean equals(Object o)
+  {
+      // Implementation note:
+      // The following is a correct but possibly slow implementation.
+      //
+      // This class has a private field 'slot' that could be used by
+      // the VM implementation to "link" a particular method to a Class.
+      // In that case equals could be simply implemented as:
+      //
+      // if (o instanceof Method)
+      // {
+      //    Method m = (Method)o;
+      //    return m.declaringClass == this.declaringClass
+      //           && m.slot == this.slot;
+      // }
+      // return false;
+      //
+      // If a VM uses the Method class as their native/internal representation
+      // then just using the following would be optimal:
+      //
+      // return this == o;
+      //
+    if (!(o instanceof Method))
+      return false;
+    Method that = (Method)o;
+    if (this.getDeclaringClass() != that.getDeclaringClass())
+      return false;
+    if (!this.getName().equals(that.getName()))
+      return false;
+    if (this.getReturnType() != that.getReturnType())
+      return false;
+    if (!Arrays.equals(this.getParameterTypes(), that.getParameterTypes()))
+      return false;
+    return true;
+  }
+
+  /**
+   * Get the hash code for the Method. The Method hash code is the hash code
+   * of its name XOR'd with the hash code of its class name.
+   *
+   * @return the hash code for the object
+   */
+  public int hashCode()
+  {
+    return getDeclaringClass().getName().hashCode() ^ getName().hashCode();
+  }
+
+  /**
+   * Get a String representation of the Method. A Method's String
+   * representation is "&lt;modifiers&gt; &lt;returntype&gt;
+   * &lt;methodname&gt;(&lt;paramtypes&gt;) throws &lt;exceptions&gt;", where
+   * everything after ')' is omitted if there are no exceptions.<br> Example:
+   * <code>public static int run(java.lang.Runnable,int)</code>
+   *
+   * @return the String representation of the Method
+   */
+  public String toString()
+  {
+    // 128 is a reasonable buffer initial size for constructor
+    StringBuffer sb = new StringBuffer(128);
+    Modifier.toString(getModifiers(), sb).append(' ');
+    sb.append(getUserTypeName(getReturnType().getName())).append(' ');
+    sb.append(getDeclaringClass().getName()).append('.');
+    sb.append(getName()).append('(');
+    Class[] c = getParameterTypes();
+    if (c.length > 0)
+      {
+        sb.append(getUserTypeName(c[0].getName()));
+        for (int i = 1; i < c.length; i++)
+          sb.append(',').append(getUserTypeName(c[i].getName()));
+      }
+    sb.append(')');
+    c = getExceptionTypes();
+    if (c.length > 0)
+      {
+        sb.append(" throws ").append(c[0].getName());
+        for (int i = 1; i < c.length; i++)
+          sb.append(',').append(c[i].getName());
+      }
+    return sb.toString();
+  }
+
+  private static String getUserTypeName(String typeSpec)
+  {
+    int pos = 0;
+    String typeName = "";
+    String arrayPart = "";
+
+    while (typeSpec.charAt(pos) == '[')
+      {
+	arrayPart += "[]";
+	++pos;
+      }
+
+    switch (typeSpec.charAt(pos))
+      {
+      case 'Z':
+	typeName = "boolean";
+	break;
+      case 'B':
+	typeName = "byte";
+	break;
+      case 'C':
+	typeName = "char";
+	break;
+      case 'D':
+	typeName = "double";
+	break;
+      case 'F':
+	typeName = "float";
+	break;
+      case 'I':
+	typeName = "int";
+	break;
+      case 'J':
+	typeName = "long";
+	break;
+      case 'S':
+	typeName = "short";
+	break;
+      case 'L':
+	typeName = typeSpec.substring(pos + 1, typeSpec.length() - 1);
+	break;
+      default:
+	typeName = typeSpec;
+	break;
+      }
+
+    return typeName + arrayPart;
+  }
+
+  /**
+   * Invoke the method. Arguments are automatically unwrapped and widened,
+   * and the result is automatically wrapped, if needed.<p>
+   *
+   * If the method is static, <code>o</code> will be ignored. Otherwise,
+   * the method uses dynamic lookup as described in JLS 15.12.4.4. You cannot
+   * mimic the behavior of nonvirtual lookup (as in super.foo()). This means
+   * you will get a <code>NullPointerException</code> if <code>o</code> is
+   * null, and an <code>IllegalArgumentException</code> if it is incompatible
+   * with the declaring class of the method. If the method takes 0 arguments,
+   * you may use null or a 0-length array for <code>args</code>.<p>
+   *
+   * Next, if this Method enforces access control, your runtime context is
+   * evaluated, and you may have an <code>IllegalAccessException</code> if
+   * you could not acces this method in similar compiled code. If the method
+   * is static, and its class is uninitialized, you trigger class
+   * initialization, which may end in a
+   * <code>ExceptionInInitializerError</code>.<p>
+   *
+   * Finally, the method is invoked. If it completes normally, the return value
+   * will be null for a void method, a wrapped object for a primitive return
+   * method, or the actual return of an Object method. If it completes
+   * abruptly, the exception is wrapped in an
+   * <code>InvocationTargetException</code>.
+   *
+   * @param o the object to invoke the method on
+   * @param args the arguments to the method
+   * @return the return value of the method, wrapped in the appropriate
+   *         wrapper if it is primitive
+   * @throws IllegalAccessException if the method could not normally be called
+   *         by the Java code (i.e. it is not public)
+   * @throws IllegalArgumentException if the number of arguments is incorrect;
+   *         if the arguments types are wrong even with a widening conversion;
+   *         or if <code>o</code> is not an instance of the class or interface
+   *         declaring this method
+   * @throws InvocationTargetException if the method throws an exception
+   * @throws NullPointerException if <code>o</code> is null and this field
+   *         requires an instance
+   * @throws ExceptionInInitializerError if accessing a static method triggered
+   *         class initialization, which then failed
+   */
+  public Object invoke(Object o, Object[] args)
+    throws IllegalAccessException, InvocationTargetException
+  {
+    return invokeNative(o, args, declaringClass, slot);
+  }
+
+  /*
+   * NATIVE HELPERS
+   */
+
+  private native Object invokeNative(Object o, Object[] args,
+                                     Class declaringClass, int slot)
+    throws IllegalAccessException, InvocationTargetException;
+}