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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.expectations.transformation;

import java.util.*;

import org.jetbrains.annotations.*;

import static mockit.external.asm4.Opcodes.*;

import mockit.internal.expectations.transformation.InvocationBlockModifier.Capture;

final class ArgumentCapturing
{
   boolean justAfterWithCaptureInvocation;
   @Nullable private List captures;
   private boolean parameterForCapture;
   @Nullable private String capturedTypeDesc;

   void registerCapturingMatcherIfApplicable(@NotNull String methodName, @NotNull String methodDesc)
   {
      justAfterWithCaptureInvocation = "withCapture".equals(methodName);
      parameterForCapture = justAfterWithCaptureInvocation && !methodDesc.contains("List");
   }

   void registerTypeToCaptureIfApplicable(int opcode, @NotNull String type)
   {
      if (opcode == CHECKCAST && parameterForCapture) {
         capturedTypeDesc = type;
      }
   }

   void registerAssignmentToCaptureVariableIfApplicable(@NotNull InvocationBlockModifier modifier, int opcode, int var)
   {
      if (opcode >= ISTORE && opcode <= ASTORE && parameterForCapture) {
         Capture capture = modifier.createCapture(opcode, var, capturedTypeDesc);
         addCapture(capture);
         parameterForCapture = false;
         capturedTypeDesc = null;
      }
   }

   private void addCapture(@NotNull Capture capture)
   {
      if (captures == null) {
         captures = new ArrayList();
      }

      captures.add(capture);
   }

   void updateCaptureIfAny(int originalIndex, int newIndex)
   {
      if (captures != null) {
         for (int i = captures.size() - 1; i >= 0; i--) {
            Capture capture = captures.get(i);

            if (capture.fixParameterIndex(originalIndex, newIndex)) {
               break;
            }
         }
      }
   }

   void generateCallsToSetArgumentTypesToCaptureIfAny()
   {
      if (captures != null) {
         for (Capture capture : captures) {
            capture.generateCallToSetArgumentTypeIfNeeded();
         }
      }
   }

   void generateCallsToCaptureMatchedArgumentsIfPending()
   {
      if (captures != null) {
         for (Capture capture : captures) {
            capture.generateCodeToStoreCapturedValue();
         }

         captures = null;
      }
   }
}