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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.
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/*
 * Copyright (c) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.util;

import java.util.*;

import org.jetbrains.annotations.*;

import mockit.internal.state.*;

public final class MethodFormatter
{
   @NotNull private final StringBuilder out;
   @NotNull private final List parameterTypes;
   @Nullable private final String classDesc;
   @NotNull private String methodDesc;

   // Auxiliary fields for handling method parameters:
   private int parameterIndex;
   private int typeDescPos;
   private char typeCode;
   private int arrayDimensions;

   public MethodFormatter(@Nullable String classDesc)
   {
      out = new StringBuilder();
      parameterTypes = new ArrayList(5);
      this.classDesc = classDesc;
      methodDesc = "";
   }

   public MethodFormatter(@NotNull String classDesc, @NotNull String methodNameAndDesc)
   {
      this(classDesc);
      methodDesc = methodNameAndDesc;
      appendFriendlyMethodSignature();
   }

   @Override
   public String toString() { return out.toString(); }

   @NotNull public List getParameterTypes() { return parameterTypes; }

   @NotNull public String friendlyMethodSignatures(@NotNull Collection methodNamesAndDescs)
   {
      String sep = "";

      for (String methodNameAndDesc : methodNamesAndDescs) {
         out.append(sep);
         methodDesc = methodNameAndDesc;
         appendFriendlyMethodSignature();
         sep = ",\n";
      }

      return out.toString();
   }

   private void appendFriendlyMethodSignature()
   {
      String friendlyDesc = methodDesc;

      if (classDesc != null) {
         String className = classDesc.replace('/', '.');
         out.append(className).append('#');

         String constructorName = getConstructorName(className);
         friendlyDesc = friendlyDesc.replace("", constructorName);
      }

      int leftParenNextPos = friendlyDesc.indexOf('(') + 1;
      int rightParenPos = friendlyDesc.indexOf(')');

      if (leftParenNextPos < rightParenPos) {
         out.append(friendlyDesc.substring(0, leftParenNextPos));
         String concatenatedParameterTypes = friendlyDesc.substring(leftParenNextPos, rightParenPos);
         parameterIndex = 0;
         appendFriendlyTypes(concatenatedParameterTypes);
         out.append(')');
      }
      else {
         out.append(friendlyDesc.substring(0, rightParenPos + 1));
      }
   }

   @NotNull private String getConstructorName(@NotNull String className)
   {
      int p = className.lastIndexOf('.');
      String constructorName = p < 0 ? className : className.substring(p + 1);

      //noinspection ReuseOfLocalVariable
      p = constructorName.lastIndexOf('$');

      if (p > 0) {
         constructorName = constructorName.substring(p + 1);
      }

      return constructorName;
   }

   private void appendFriendlyTypes(@NotNull String typeDescs)
   {
      String sep = "";

      for (String typeDesc : typeDescs.split(";")) {
         out.append(sep);

         if (typeDesc.charAt(0) == 'L') {
            appendParameterType(friendlyReferenceType(typeDesc));
            appendParameterName();
         }
         else {
            appendFriendlyPrimitiveTypes(typeDesc);
         }

         sep = ", ";
      }
   }

   @NotNull private String friendlyReferenceType(@NotNull String typeDesc)
   {
      return typeDesc.substring(1).replace("java/lang/", "").replace('/', '.');
   }

   private void appendParameterType(@NotNull String friendlyTypeDesc)
   {
      out.append(friendlyTypeDesc);
      parameterTypes.add(friendlyTypeDesc);
   }

   private void appendParameterName()
   {
      if (classDesc != null) {
         String name = ParameterNames.getName(classDesc, methodDesc, parameterIndex);

         if (name != null) {
            out.append(' ').append(name);
         }
      }

      parameterIndex++;
   }

   private void appendFriendlyPrimitiveTypes(String typeDesc)
   {
      String sep = "";

      for (typeDescPos = 0; typeDescPos < typeDesc.length(); typeDescPos++) {
         typeCode = typeDesc.charAt(typeDescPos);
         advancePastArrayDimensionsIfAny(typeDesc);

         out.append(sep);

         String paramType = getTypeNameForTypeDesc(typeDesc) + getArrayBrackets();
         appendParameterType(paramType);
         appendParameterName();

         sep = ", ";
      }
   }

   @SuppressWarnings("OverlyComplexMethod")
   @NotNull private String getTypeNameForTypeDesc(@NotNull String typeDesc)
   {
      String paramType;

      switch (typeCode) {
         case 'B': return "byte";
         case 'C': return "char";
         case 'D': return "double";
         case 'F': return "float";
         case 'I': return "int";
         case 'J': return "long";
         case 'S': return "short";
         case 'V': return "void";
         case 'Z': return "boolean";
         case 'L':
            paramType = friendlyReferenceType(typeDesc.substring(typeDescPos));
            typeDescPos = typeDesc.length();
            break;
         default:
            paramType = typeDesc.substring(typeDescPos);
            typeDescPos = typeDesc.length();
      }

      return paramType;
   }

   private void advancePastArrayDimensionsIfAny(@NotNull String param)
   {
      arrayDimensions = 0;

      while (typeCode == '[') {
         typeDescPos++;
         typeCode = param.charAt(typeDescPos);
         arrayDimensions++;
      }
   }

   @NotNull private String getArrayBrackets()
   {
      @SuppressWarnings("NonConstantStringShouldBeStringBuffer")
      String result = "";

      for (int i = 0; i < arrayDimensions; i++) {
         //noinspection StringContatenationInLoop
         result += "[]";
      }

      return result;
   }
}