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mockit.internal.injection.constructor.ConstructorSearch Maven / Gradle / Ivy
/*
* Copyright (c) 2006 Rogério Liesenfeld
* This file is subject to the terms of the MIT license (see LICENSE.txt).
*/
package mockit.internal.injection.constructor;
import java.lang.annotation.*;
import java.lang.reflect.*;
import java.util.*;
import javax.annotation.*;
import static java.lang.reflect.Modifier.*;
import mockit.internal.injection.*;
import mockit.internal.state.*;
import mockit.internal.util.*;
import static mockit.internal.injection.InjectionPoint.*;
public final class ConstructorSearch
{
private static final int CONSTRUCTOR_ACCESS = PUBLIC + PROTECTED + PRIVATE;
@Nonnull private final InjectionState injectionState;
@Nonnull private final TestedClass testedClass;
@Nonnull private final String testedClassDesc;
@Nonnull public List parameterProviders;
private final boolean withFullInjection;
@Nullable private Constructor constructor;
@Nullable private StringBuilder searchResults;
public ConstructorSearch(
@Nonnull InjectionState injectionState, @Nonnull TestedClass testedClass, boolean withFullInjection)
{
this.injectionState = injectionState;
this.testedClass = testedClass;
Class declaredClass = testedClass.getDeclaredClass();
testedClassDesc = new ParameterNameExtractor().extractNames(declaredClass);
parameterProviders = new ArrayList();
this.withFullInjection = withFullInjection;
}
@Nullable
public Constructor findConstructorToUse()
{
constructor = null;
Class declaredClass = testedClass.targetClass;
Constructor[] constructors = declaredClass.getDeclaredConstructors();
if (!findSingleAnnotatedConstructor(constructors)) {
findSatisfiedConstructorWithMostParameters(constructors);
}
return constructor;
}
private boolean findSingleAnnotatedConstructor(@Nonnull Constructor[] constructors)
{
for (Constructor c : constructors) {
if (kindOfInjectionPoint(c) != KindOfInjectionPoint.NotAnnotated) {
List providersFound = findParameterProvidersForConstructor(c);
if (providersFound != null) {
parameterProviders = providersFound;
constructor = c;
}
return true;
}
}
return false;
}
private void findSatisfiedConstructorWithMostParameters(@Nonnull Constructor[] constructors)
{
sortConstructorsWithMostAccessibleFirst(constructors);
Constructor unresolvedConstructor = null;
List incompleteProviders = null;
for (Constructor candidateConstructor : constructors) {
List providersFound = findParameterProvidersForConstructor(candidateConstructor);
if (providersFound != null) {
if (withFullInjection && containsUnresolvedProvider(providersFound)) {
if (
unresolvedConstructor == null ||
isLargerConstructor(candidateConstructor, providersFound, unresolvedConstructor, incompleteProviders)
) {
unresolvedConstructor = candidateConstructor;
incompleteProviders = providersFound;
}
}
else if (
constructor == null ||
isLargerConstructor(candidateConstructor, providersFound, constructor, parameterProviders)
) {
constructor = candidateConstructor;
parameterProviders = providersFound;
}
}
}
selectConstructorWithUnresolvedParameterIfMoreAccessible(unresolvedConstructor, incompleteProviders);
}
private static void sortConstructorsWithMostAccessibleFirst(@Nonnull Constructor[] constructors)
{
if (constructors.length > 1) {
Arrays.sort(constructors, CONSTRUCTOR_COMPARATOR);
}
}
private static final Comparator> CONSTRUCTOR_COMPARATOR = new Comparator>() {
@Override
public int compare(Constructor c1, Constructor c2) { return compareAccessibility(c1, c2); }
};
private static int compareAccessibility(@Nonnull Constructor c1, @Nonnull Constructor c2)
{
int m1 = getModifiers(c1);
int m2 = getModifiers(c2);
if (m1 == m2) return 0;
if (m1 == PUBLIC) return -1;
if (m2 == PUBLIC) return 1;
if (m1 == PROTECTED) return -1;
if (m2 == PROTECTED) return 1;
if (m2 == PRIVATE) return -1;
return 1;
}
private static boolean containsUnresolvedProvider(@Nonnull List providersFound)
{
for (InjectionProvider provider : providersFound) {
if (provider instanceof ConstructorParameter && provider.getValue(null) == null) {
return true;
}
}
return false;
}
private boolean isLargerConstructor(
@Nonnull Constructor candidateConstructor, @Nonnull List providersFound,
@Nonnull Constructor previousSatisfiableConstructor, @Nonnull List previousProviders)
{
return
getModifiers(candidateConstructor) == getModifiers(previousSatisfiableConstructor) &&
providersFound.size() >= previousProviders.size();
}
private static int getModifiers(@Nonnull Constructor c) { return CONSTRUCTOR_ACCESS & c.getModifiers(); }
@Nullable
private List findParameterProvidersForConstructor(@Nonnull Constructor candidate)
{
Type[] parameterTypes = candidate.getGenericParameterTypes();
Annotation[][] parameterAnnotations = candidate.getParameterAnnotations();
int n = parameterTypes.length;
List providersFound = new ArrayList(n);
boolean varArgs = candidate.isVarArgs();
if (varArgs) {
n--;
}
printCandidateConstructorNameIfRequested(candidate);
String constructorDesc = "" + mockit.external.asm.Type.getConstructorDescriptor(candidate);
for (int i = 0; i < n; i++) {
Type parameterType = parameterTypes[i];
injectionState.setTypeOfInjectionPoint(parameterType);
String parameterName = ParameterNames.getName(testedClassDesc, constructorDesc, i);
Annotation[] appliedAnnotations = parameterAnnotations[i];
InjectionProvider provider = findOrCreateInjectionProvider(parameterType, parameterName, appliedAnnotations);
if (provider == null || providersFound.contains(provider)) {
printParameterOfCandidateConstructorIfRequested(parameterName, provider);
return null;
}
providersFound.add(provider);
}
if (varArgs) {
Type parameterType = parameterTypes[n];
InjectionProvider injectable = hasInjectedValuesForVarargsParameter(parameterType);
if (injectable != null) {
providersFound.add(injectable);
}
}
return providersFound;
}
@Nullable
private InjectionProvider findOrCreateInjectionProvider(
@Nonnull Type parameterType, @Nullable String parameterName, @Nonnull Annotation[] parameterAnnotations)
{
String qualifiedName = getQualifiedName(parameterAnnotations);
if (parameterName == null && qualifiedName == null) {
return null;
}
boolean qualified = qualifiedName != null;
String targetName = qualified ? qualifiedName : parameterName;
InjectionProvider provider = injectionState.getProviderByTypeAndOptionallyName(targetName, testedClass);
if (provider != null) {
return provider;
}
InjectionPoint injectionPoint = new InjectionPoint(parameterType, targetName, qualifiedName);
Object valueForParameter = injectionState.getTestedValue(testedClass, injectionPoint);
if (valueForParameter == null && !withFullInjection) {
return null;
}
return new ConstructorParameter(parameterType, parameterAnnotations, targetName, valueForParameter);
}
@Nullable
private InjectionProvider hasInjectedValuesForVarargsParameter(@Nonnull Type parameterType)
{
Type varargsElementType = getTypeOfInjectionPointFromVarargsParameter(parameterType);
injectionState.setTypeOfInjectionPoint(varargsElementType);
return injectionState.findNextInjectableForInjectionPoint(testedClass);
}
private void selectConstructorWithUnresolvedParameterIfMoreAccessible(
@Nullable Constructor unresolvedConstructor, List incompleteProviders)
{
if (
unresolvedConstructor != null &&
(constructor == null || compareAccessibility(unresolvedConstructor, constructor) < 0)
) {
constructor = unresolvedConstructor;
parameterProviders = incompleteProviders;
}
}
// Methods used only when no satisfiable constructor is found //////////////////////////////////////////////////////
@Nonnull
public String getDescription()
{
searchResults = new StringBuilder();
findConstructorToUse();
String contents = searchResults.toString();
searchResults = null;
return contents;
}
private void printCandidateConstructorNameIfRequested(@Nonnull Constructor candidate)
{
if (searchResults != null) {
String constructorDesc = candidate.toGenericString().replace("java.lang.", "");
searchResults.append("\r\n ").append(constructorDesc).append("\r\n");
}
}
private void printParameterOfCandidateConstructorIfRequested(
@Nullable String parameterName, @Nullable InjectionProvider injectableFound)
{
if (searchResults != null) {
searchResults.append(" disregarded because ");
if (parameterName == null) {
searchResults.append("parameter names are not available");
}
else {
searchResults.append(
"no tested/injectable value was found for parameter \"").append(parameterName).append('"');
if (injectableFound != null) {
searchResults.append(" that hadn't been used already");
}
}
}
}
}