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1 files changed, 501 insertions, 0 deletions

diff --git a/libjava/java/lang/reflect/Method.java b/libjava/java/lang/reflect/Method.java
new file mode 100644
index 000000000..878210abb
--- /dev/null
+++ b/libjava/java/lang/reflect/Method.java
@@ -0,0 +1,501 @@
+// Method.java - Represent method of class or interface.
+
+/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2006, 2007  Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+ 
+package java.lang.reflect;
+
+import gnu.gcj.RawData;
+import gnu.java.lang.reflect.MethodSignatureParser;
+import java.lang.annotation.Annotation;
+
+/**
+ * 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>
+ * @author Tom Tromey <tromey@redhat.com>
+ * @see Member
+ * @see Class
+ * @see java.lang.Class#getMethod(String,Class[])
+ * @see java.lang.Class#getDeclaredMethod(String,Class[])
+ * @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, GenericDeclaration
+{
+  static final int METHOD_MODIFIERS
+    = Modifier.ABSTRACT | Modifier.FINAL | Modifier.NATIVE
+      | Modifier.PRIVATE | Modifier.PROTECTED | Modifier.PUBLIC
+      | Modifier.STATIC | Modifier.STRICT | Modifier.SYNCHRONIZED;
+
+  /**
+   * This class is uninstantiable.
+   */
+  private Method ()
+  {
+  }
+
+  /**
+   * 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 native String getName ();
+
+  /**
+   * Return the raw modifiers for this method.
+   * @return the method's modifiers
+   */
+  private native int getModifiersInternal();
+
+  /**
+   * 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 int getModifiers()
+  {
+    return getModifiersInternal() & METHOD_MODIFIERS;
+  }
+
+  /**
+   * Return true if this method is a bridge method.  A bridge method
+   * is generated by the compiler in some situations involving
+   * generics and inheritance.
+   * @since 1.5
+   */
+  public boolean isBridge()
+  {
+    return (getModifiersInternal() & Modifier.BRIDGE) != 0;
+  }
+
+  /**
+   * Return true if this method is synthetic, false otherwise.
+   * @since 1.5
+   */
+  public boolean isSynthetic()
+  {
+    return (getModifiersInternal() & Modifier.SYNTHETIC) != 0;
+  }
+
+  /**
+   * Return true if this is a varargs method, that is if
+   * the method takes a variable number of arguments.
+   * @since 1.5
+   */
+  public boolean isVarArgs()
+  {
+    return (getModifiersInternal() & Modifier.VARARGS) != 0;
+  }
+
+  /**
+   * Gets the return type of this method.
+   * @return the type of this method
+   */
+  public Class<?> getReturnType ()
+  {
+    if (return_type == null)
+      getType();
+    return return_type;
+  }
+
+  /**
+   * 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 Class<?>[] getParameterTypes ()
+  {
+    if (parameter_types == null)
+      getType();
+    return (Class<?>[]) parameter_types.clone();
+  }
+
+  // Just like getParameterTypes, but don't clone the array.
+  // Package private for use by VMProxy.
+  final Class<?>[] internalGetParameterTypes ()
+  {
+    if (parameter_types == null)
+      getType();
+    return (Class<?>[]) parameter_types;
+  }
+
+  /**
+   * 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 Class<?>[] getExceptionTypes ()
+  {
+    if (exception_types == null)
+      getType();
+    return (Class<?>[]) exception_types.clone();
+  }
+
+  // Just like getExceptionTypes, but don't clone the array.
+  // Package private for use by VMProxy.
+  final Class<?>[] internalGetExceptionTypes ()
+  {
+    if (exception_types == null)
+      getType();
+    return (Class<?>[]) exception_types;
+  }
+
+  /**
+   * Compare two objects to see if they are semantically equivalent.
+   * Two Methods are semantically equivalent if they have the same declaring
+   * class, name, and parameter list.  This ignores different exception
+   * clauses or return types.
+   *
+   * @param o the object to compare to
+   * @return <code>true</code> if they are equal; <code>false</code> if not
+   */
+  public boolean equals (Object obj)
+  {
+    if (! (obj instanceof Method))
+      return false;
+    Method m = (Method) obj;
+    return declaringClass == m.declaringClass && offset == m.offset;
+  }
+
+  /**
+   * 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()
+  {
+    if (parameter_types == null)
+      getType ();
+
+    StringBuffer b = new StringBuffer ();
+    int mods = getModifiers();
+    if (mods != 0)
+      {
+	Modifier.toString(mods, b);
+	b.append(" ");
+      }
+    appendClassName (b, return_type);
+    b.append(" ");
+    appendClassName (b, declaringClass);
+    b.append(".");
+    b.append(getName());
+    b.append("(");
+    for (int i = 0; i < parameter_types.length; ++i)
+      {
+	appendClassName (b, parameter_types[i]);
+	if (i < parameter_types.length - 1)
+	  b.append(",");
+      }
+    b.append(")");
+    if (exception_types.length > 0)
+      {
+	b.append(" throws ");
+	for (int i = 0; i < exception_types.length; ++i)
+	  {
+	    appendClassName (b, exception_types[i]);
+	    if (i < exception_types.length - 1)
+	      b.append(",");
+	  }
+      }
+    return b.toString();
+  }
+
+  public String toGenericString()
+  {
+    // 128 is a reasonable buffer initial size for constructor
+    StringBuilder sb = new StringBuilder(128);
+    Modifier.toString(getModifiers(), sb).append(' ');
+    Constructor.addTypeParameters(sb, getTypeParameters());
+    sb.append(getGenericReturnType()).append(' ');
+    sb.append(getDeclaringClass().getName()).append('.');
+    sb.append(getName()).append('(');
+    Type[] types = getGenericParameterTypes();
+    if (types.length > 0)
+      {
+        sb.append(types[0]);
+        for (int i = 1; i < types.length; i++)
+          sb.append(',').append(types[i]);
+      }
+    sb.append(')');
+    types = getGenericExceptionTypes();
+    if (types.length > 0)
+      {
+        sb.append(" throws ").append(types[0]);
+        for (int i = 1; i < types.length; i++)
+          sb.append(',').append(types[i]);
+      }
+    return sb.toString();
+  }
+
+  /**
+   * 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 native Object invoke (Object obj, Object... args)
+    throws IllegalAccessException, IllegalArgumentException,
+    InvocationTargetException;
+
+  /**
+   * Returns an array of <code>TypeVariable</code> objects that represents
+   * the type variables declared by this constructor, in declaration order.
+   * An array of size zero is returned if this class has no type
+   * variables.
+   *
+   * @return the type variables associated with this class. 
+   * @throws GenericSignatureFormatError if the generic signature does
+   *         not conform to the format specified in the Virtual Machine
+   *         specification, version 3.
+   * @since 1.5
+   */
+  public TypeVariable<Method>[] getTypeParameters()
+  {
+    String sig = getSignature();
+    if (sig == null)
+      return new TypeVariable[0];
+    MethodSignatureParser p = new MethodSignatureParser(this, sig);
+    return p.getTypeParameters();
+  }
+
+  /**
+   * Return the String in the Signature attribute for this method. If there
+   * is no Signature attribute, return null.
+   */
+  private native String getSignature();
+
+  /**
+   * Returns an array of <code>Type</code> objects that represents
+   * the exception types declared by this method, in declaration order.
+   * An array of size zero is returned if this method declares no
+   * exceptions.
+   *
+   * @return the exception types declared by this method. 
+   * @throws GenericSignatureFormatError if the generic signature does
+   *         not conform to the format specified in the Virtual Machine
+   *         specification, version 3.
+   * @since 1.5
+   */
+  public Type[] getGenericExceptionTypes()
+  {
+    String sig = getSignature();
+    if (sig == null)
+      return getExceptionTypes();
+    MethodSignatureParser p = new MethodSignatureParser(this, sig);
+    return p.getGenericExceptionTypes();
+  }
+
+  /**
+   * Returns an array of <code>Type</code> objects that represents
+   * the parameter list for this method, in declaration order.
+   * An array of size zero is returned if this method takes no
+   * parameters.
+   *
+   * @return a list of the types of the method's parameters
+   * @throws GenericSignatureFormatError if the generic signature does
+   *         not conform to the format specified in the Virtual Machine
+   *         specification, version 3.
+   * @since 1.5
+   */
+  public Type[] getGenericParameterTypes()
+  {
+    String sig = getSignature();
+    if (sig == null)
+      return getParameterTypes();
+    MethodSignatureParser p = new MethodSignatureParser(this, sig);
+    return p.getGenericParameterTypes();
+  }
+
+  /**
+   * Returns the return type of this method.
+   *
+   * @return the return type of this method
+   * @throws GenericSignatureFormatError if the generic signature does
+   *         not conform to the format specified in the Virtual Machine
+   *         specification, version 3.
+   * @since 1.5
+   */
+  public Type getGenericReturnType()
+  {
+    String sig = getSignature();
+    if (sig == null)
+      return getReturnType();
+    MethodSignatureParser p = new MethodSignatureParser(this, sig);
+    return p.getGenericReturnType();
+  }
+
+  /**
+   * If this method is an annotation method, returns the default
+   * value for the method.  If there is no default value, or if the
+   * method is not a member of an annotation type, returns null.
+   * Primitive types are wrapped.
+   *
+   * @throws TypeNotPresentException if the method returns a Class,
+   * and the class cannot be found
+   *
+   * @since 1.5
+   */
+  public native Object getDefaultValue();
+
+  public <T extends Annotation> T getAnnotation(Class<T> annoClass)
+  {
+    Annotation[] annos = getDeclaredAnnotations();
+    for (int i = 0; i < annos.length; ++i)
+      if (annos[i].annotationType() == annoClass)
+	return (T) annos[i];
+    return null;
+  }
+
+  public Annotation[] getDeclaredAnnotations()
+  {
+    Annotation[] result = getDeclaredAnnotationsInternal();
+    if (result == null)
+      result = new Annotation[0];
+    return result;
+  }
+
+  public Annotation[][] getParameterAnnotations()
+  {
+    // FIXME: should check that we have the right number
+    // of parameters ...?
+    Annotation[][] result = getParameterAnnotationsInternal();
+    if (result == null)
+      result = new Annotation[0][0];
+    return result;
+  }
+
+  private native Annotation[] getDeclaredAnnotationsInternal();
+  private native Annotation[][] getParameterAnnotationsInternal();
+
+  private native void getType ();
+
+  // Append a class name to a string buffer.  We try to print the
+  // fully-qualified name, the way that a Java programmer would expect
+  // it to be written.  Weirdly, Class has no appropriate method for
+  // this.
+  static void appendClassName (StringBuffer buf, Class k)
+  {
+    if (k.isArray ())
+      {
+	appendClassName (buf, k.getComponentType ());
+	buf.append ("[]");
+      }
+    else
+      {
+	// This is correct for primitive and reference types.  Really
+	// we'd like `Main$Inner' to be printed as `Main.Inner', I
+	// think, but that is a pain.
+	buf.append (k.getName ());
+      }
+  }
+
+  // Declaring class.
+  private Class declaringClass;
+
+  // Exception types.
+  Class[] exception_types;
+  // Name cache.  (Initially null.)
+  private String name;
+  // Parameter types.
+  Class[] parameter_types;
+  // Return type.
+  Class return_type;
+
+  // Offset in bytes from the start of declaringClass's methods array.
+  private int offset;
+}