/*

  * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code 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

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 package sun.invoke.util;

 import java.lang.invoke.MethodType;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * Utility routines for dealing with bytecode-level signatures.

  * @author jrose

  */

 public class BytecodeDescriptor {

     private BytecodeDescriptor() { }  // cannot instantiate

     public static List<Class<?>> parseMethod(String bytecodeSignature, ClassLoader loader) {

         return parseMethod(bytecodeSignature, 0, bytecodeSignature.length(), loader);

     }

     static List<Class<?>> parseMethod(String bytecodeSignature,

             int start, int end, ClassLoader loader) {

         if (loader == null)

             loader = ClassLoader.getSystemClassLoader();

         String str = bytecodeSignature;

         int[] i = {start};

         ArrayList<Class<?>> ptypes = new ArrayList<Class<?>>();

         if (i[0] < end && str.charAt(i[0]) == '(') {

             ++i[0];  // skip '('

             while (i[0] < end && str.charAt(i[0]) != ')') {

                 Class<?> pt = parseSig(str, i, end, loader);

                 if (pt == null || pt == void.class)

                     parseError(str, "bad argument type");

                 ptypes.add(pt);

             }

             ++i[0];  // skip ')'

         } else {

             parseError(str, "not a method type");

         }

         Class<?> rtype = parseSig(str, i, end, loader);

         if (rtype == null || i[0] != end)

             parseError(str, "bad return type");

         ptypes.add(rtype);

         return ptypes;

     }

     static private void parseError(String str, String msg) {

         throw new IllegalArgumentException("bad signature: "+str+": "+msg);

     }

     static private Class<?> parseSig(String str, int[] i, int end, ClassLoader loader) {

         if (i[0] == end)  return null;

         char c = str.charAt(i[0]++);

         if (c == 'L') {

             int begc = i[0], endc = str.indexOf(';', begc);

             if (endc < 0)  return null;

             i[0] = endc+1;

             String name = str.substring(begc, endc).replace('/', '.');

             try {

                 return loader.loadClass(name);

             } catch (ClassNotFoundException ex) {

                 throw new TypeNotPresentException(name, ex);

             }

         } else if (c == '[') {

             Class<?> t = parseSig(str, i, end, loader);

             if (t != null)

                 t = java.lang.reflect.Array.newInstance(t, 0).getClass();

             return t;

         } else {

             return Wrapper.forBasicType(c).primitiveType();

         }

     }

     public static String unparse(Class<?> type) {

         StringBuilder sb = new StringBuilder();

         unparseSig(type, sb);

         return sb.toString();

     }

     public static String unparse(MethodType type) {

         return unparseMethod(type.returnType(), type.parameterList());

     }

     public static String unparse(Object type) {

         if (type instanceof Class<?>)

             return unparse((Class<?>) type);

         if (type instanceof MethodType)

             return unparse((MethodType) type);

         return (String) type;

     }

     public static String unparseMethod(Class<?> rtype, List<Class<?>> ptypes) {

         StringBuilder sb = new StringBuilder();

         sb.append('(');

         for (Class<?> pt : ptypes)

             unparseSig(pt, sb);

         sb.append(')');

         unparseSig(rtype, sb);

         return sb.toString();

     }

     static private void unparseSig(Class<?> t, StringBuilder sb) {

         char c = Wrapper.forBasicType(t).basicTypeChar();

         if (c != 'L') {

             sb.append(c);

         } else {

             boolean lsemi = (!t.isArray());

             if (lsemi)  sb.append('L');

             sb.append(t.getName().replace('.', '/'));

             if (lsemi)  sb.append(';');

         }

     }

 }