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JMockit is a Java toolkit for automated developer testing. It contains mocking/faking APIs and a code coverage tool, 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 JMockit developers
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.expectations.transformation;

import java.util.*;
import javax.annotation.*;

import mockit.asm.*;
import static mockit.asm.Opcodes.*;

public final class ArgumentCapturing
{
   private static final Map varIndexToTypeDesc = new HashMap<>();

   @Nonnull private final InvocationBlockModifier modifier;
   @Nullable private List captures;
   private boolean parameterForCapture;
   @Nullable private String capturedTypeDesc;

   ArgumentCapturing(@Nonnull InvocationBlockModifier modifier) { this.modifier = modifier; }

   boolean registerMatcher(boolean withCaptureMethod, @Nonnull String methodDesc, @Nonnegative int lastLoadedVarIndex) {
      if (withCaptureMethod && "(Ljava/lang/Object;)Ljava/util/List;".equals(methodDesc)) {
         return false;
      }

      if (withCaptureMethod) {
         if (methodDesc.contains("List")) {
            if (lastLoadedVarIndex > 0) {
               int parameterIndex = modifier.argumentMatching.getMatcherCount();
               Capture capture = new Capture(modifier, lastLoadedVarIndex, parameterIndex);
               addCapture(capture);
            }

            parameterForCapture = false;
         }
         else {
            parameterForCapture = true;
         }
      }
      else {
         parameterForCapture = false;
      }

      return true;
   }

   void registerTypeToCaptureIfApplicable(@Nonnegative int opcode, @Nonnull String typeDesc) {
      if (opcode == CHECKCAST && parameterForCapture) {
         capturedTypeDesc = typeDesc;
      }
   }

   static void registerTypeToCaptureIntoListIfApplicable(@Nonnegative int varIndex, @Nonnull String signature) {
      if (signature.startsWith("Ljava/util/List<")) {
         String typeDesc = signature.substring(16, signature.length() - 2);
         int p = typeDesc.indexOf('<');

         if (p > 0) {
            typeDesc = typeDesc.substring(0, p) + ';';
         }

         ReferenceType type = ReferenceType.createFromTypeDescriptor(typeDesc);
         varIndexToTypeDesc.put(varIndex, type.getInternalName());
      }
   }

   void registerAssignmentToCaptureVariableIfApplicable(@Nonnegative int opcode, @Nonnegative int varIndex) {
      if (opcode >= ISTORE && opcode <= ASTORE && parameterForCapture) {
         int parameterIndex = modifier.argumentMatching.getMatcherCount() - 1;
         Capture capture = new Capture(modifier, opcode, varIndex, capturedTypeDesc, parameterIndex);
         addCapture(capture);
         parameterForCapture = false;
         capturedTypeDesc = null;
      }
   }

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

      captures.add(capture);
   }

   void updateCaptureIfAny(@Nonnegative int originalIndex, @Nonnegative 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;
      }
   }

   @Nullable
   public static String extractArgumentType(@Nonnegative int varIndex) {
      return varIndexToTypeDesc.remove(varIndex);
   }
}