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+/* TypeSignature.java -- Class used to compute type signatures
+   Copyright (C) 1998, 2000, 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 gnu.java.lang.reflect;
+
+import gnu.java.lang.CPStringBuilder;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.Member;
+import java.lang.reflect.Method;
+
+/**
+ * This class provides static methods that can be used to compute
+ * type-signatures of <code>Class</code>s or <code>Member</code>s.
+ * More specific methods are also provided for computing the
+ * type-signature of <code>Constructor</code>s and
+ * <code>Method</code>s.  Methods are also provided to go in the
+ * reverse direction.
+ *
+ * @author Eric Blake (ebb9@email.byu.edu)
+ */
+public class TypeSignature
+{
+  /**
+   * Returns a <code>String</code> representing the type-encoding of a class.
+   * The .class file format has different encodings for classes, depending
+   * on whether it must be disambiguated from primitive types or not; hence
+   * the descriptor parameter to choose between them. If you are planning
+   * on decoding primitive types along with classes, then descriptor should
+   * be true for correct results. Type-encodings are computed as follows:
+   *
+   * <pre>
+   * boolean -> "Z"
+   * byte    -> "B"
+   * char    -> "C"
+   * double  -> "D"
+   * float   -> "F"
+   * int     -> "I"
+   * long    -> "J"
+   * short   -> "S"
+   * void    -> "V"
+   * arrays  -> "[" + descriptor format of component type
+   * object  -> class format: fully qualified name with '.' replaced by '/'
+   *            descriptor format: "L" + class format + ";"
+   * </pre>
+   *
+   * @param type the class name to encode
+   * @param descriptor true to return objects in descriptor format
+   * @return the class name, as it appears in bytecode constant pools
+   * @see #getClassForEncoding(String)
+   */
+  public static String getEncodingOfClass(String type, boolean descriptor)
+  {
+    if (! descriptor || type.charAt(0) == '[')
+      return type.replace('.', '/');
+    if (type.equals("boolean"))
+      return "Z";
+    if (type.equals("byte"))
+      return "B";
+    if (type.equals("short"))
+      return "S";
+    if (type.equals("char"))
+      return "C";
+    if (type.equals("int"))
+      return "I";
+    if (type.equals("long"))
+      return "J";
+    if (type.equals("float"))
+      return "F";
+    if (type.equals("double"))
+      return "D";
+    if (type.equals("void"))
+      return "V";
+    return 'L' + type.replace('.', '/') + ';';
+  }
+
+  /**
+   * Gets the descriptor encoding for a class.
+   *
+   * @param clazz the class to encode
+   * @param descriptor true to return objects in descriptor format
+   * @return the class name, as it appears in bytecode constant pools
+   * @see #getEncodingOfClass(String, boolean)
+   */
+  public static String getEncodingOfClass(Class clazz, boolean descriptor)
+  {
+    return getEncodingOfClass(clazz.getName(), descriptor);
+  }
+
+  /**
+   * Gets the descriptor encoding for a class.
+   *
+   * @param clazz the class to encode
+   * @return the class name, as it appears in bytecode constant pools
+   * @see #getEncodingOfClass(String, boolean)
+   */
+  public static String getEncodingOfClass(Class clazz)
+  {
+    return getEncodingOfClass(clazz.getName(), true);
+  }
+
+
+  /**
+   * This function is the inverse of <code>getEncodingOfClass</code>. This
+   * accepts both object and descriptor formats, but must know which style
+   * of string is being passed in (usually, descriptor should be true). In
+   * descriptor format, "I" is treated as int.class, in object format, it
+   * is treated as a class named I in the unnamed package. This method is
+   * strictly equivalent to {@link #getClassForEncoding(java.lang.String, boolean, java.lang.ClassLoader)}
+   * with a class loader equal to <code>null</code>. In that case, it
+   * uses the default class loader on the calling stack.
+   *
+   * @param type_code the class name to decode
+   * @param descriptor if the string is in descriptor format
+   * @return the corresponding Class object
+   * @throws ClassNotFoundException if the class cannot be located
+   * @see #getEncodingOfClass(Class, boolean)
+   */
+  public static Class getClassForEncoding(String type_code, boolean descriptor)
+    throws ClassNotFoundException
+  {
+    return getClassForEncoding(type_code, descriptor, null);
+  }
+
+  /**
+   * This function is the inverse of <code>getEncodingOfClass</code>. This
+   * accepts both object and descriptor formats, but must know which style
+   * of string is being passed in (usually, descriptor should be true). In
+   * descriptor format, "I" is treated as int.class, in object format, it
+   * is treated as a class named I in the unnamed package.
+   *
+   * @param type_code The class name to decode.
+   * @param descriptor If the string is in descriptor format.
+   * @param loader The class loader when resolving generic object name. If
+   * <code>loader</code> is null then it uses the default class loader on the
+   * calling stack.
+   * @return the corresponding Class object.
+   * @throws ClassNotFoundException if the class cannot be located.
+   * @see #getEncodingOfClass(Class, boolean)
+   * @see #getClassForEncoding(String, boolean)
+   */
+  public static Class getClassForEncoding(String type_code, boolean descriptor,
+		 			  ClassLoader loader)
+    throws ClassNotFoundException
+  {
+    if (descriptor)
+      {
+        switch (type_code.charAt(0))
+          {
+          case 'B':
+            return byte.class;
+          case 'C':
+            return char.class;
+          case 'D':
+            return double.class;
+          case 'F':
+            return float.class;
+          case 'I':
+            return int.class;
+          case 'J':
+            return long.class;
+          case 'S':
+            return short.class;
+          case 'V':
+            return void.class;
+          case 'Z':
+            return boolean.class;
+          default:
+            throw new ClassNotFoundException("Invalid class name: "
+                                             + type_code);
+          case 'L':
+            type_code = type_code.substring(1, type_code.length() - 1);
+            // Fallthrough.
+          case '[':
+          }
+      }
+    return Class.forName(type_code.replace('/', '.'), true, loader);
+  }
+
+  /**
+   * Gets the Class object for a type name.
+   *
+   * @param type_code the class name to decode
+   * @return the corresponding Class object
+   * @throws ClassNotFoundException if the class cannot be located
+   * @see #getClassForEncoding(String, boolean)
+   */
+  public static Class getClassForEncoding(String type_code)
+    throws ClassNotFoundException
+  {
+    return getClassForEncoding(type_code, true);
+  }
+
+  /**
+   * Returns a <code>String</code> representing the type-encoding of a
+   * method.  The type-encoding of a method is:
+   *
+   * "(" + parameter type descriptors + ")" + return type descriptor
+   *
+   * XXX This could be faster if it were implemented natively.
+   *
+   * @param m the method to encode
+   * @return the encoding
+   */
+  public static String getEncodingOfMethod(Method m)
+  {
+    Class[] paramTypes = m.getParameterTypes();
+    CPStringBuilder buf = new CPStringBuilder("(");
+    for (int i = 0; i < paramTypes.length; i++)
+      buf.append(getEncodingOfClass(paramTypes[i].getName(), true));
+    buf.append(')').append(getEncodingOfClass(m.getReturnType().getName(),
+                                              true));
+    return buf.toString();
+  }
+
+  /**
+   * Returns a <code>String</code> representing the type-encoding of a
+   * constructor. The type-encoding of a method is:
+   *
+   * "(" + parameter type descriptors + ")V"
+   *
+   * XXX This could be faster if it were implemented natively.
+   *
+   * @param c the constructor to encode
+   * @return the encoding
+   */
+  public static String getEncodingOfConstructor(Constructor c)
+  {
+    Class[] paramTypes = c.getParameterTypes();
+    CPStringBuilder buf = new CPStringBuilder("(");
+    for (int i = 0; i < paramTypes.length; i++)
+      buf.append(getEncodingOfClass(paramTypes[i].getName(), true));
+    buf.append(")V");
+    return buf.toString();
+  }
+
+  /**
+   * Returns a <code>String</code> representing the type-encoding of a
+   * class member. This appropriately handles Constructors, Methods, and
+   * Fields.
+   *
+   * @param mem the member to encode
+   * @return the encoding
+   */
+  public static String getEncodingOfMember(Member mem)
+  {
+    if (mem instanceof Constructor)
+      return getEncodingOfConstructor((Constructor) mem);
+    if (mem instanceof Method)
+      return getEncodingOfMethod((Method) mem);
+    else // Field
+      return getEncodingOfClass(((Field) mem).getType().getName(), true);
+  }
+} // class TypeSignature