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Fixed an NPE in ImplicitPropertyAccessor due to putting null value in ConcurrentHashMap

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This commit is contained in:
Abhinav Sarkar 2012-05-18 00:27:51 +05:30
parent 2c3d0f10d9
commit 410dcdada2
4 changed files with 22 additions and 10 deletions
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3
src/main/java/net/abhinavsarkar/spelhelper/ImplicitConstructorResolver.java
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@ -27,8 +27,7 @@ import org.springframework.expression.ConstructorResolver;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.spel.support.ReflectiveConstructorResolver;
final class ImplicitConstructorResolver implements
ConstructorResolver {
final class ImplicitConstructorResolver implements ConstructorResolver {
private final ReflectiveConstructorResolver delegate = new ReflectiveConstructorResolver();

9
src/main/java/net/abhinavsarkar/spelhelper/ImplicitMethodResolver.java
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@ -39,20 +39,21 @@ final class ImplicitMethodResolver implements MethodResolver {
private final ReflectiveMethodResolver delegate = new ReflectiveMethodResolver();
private static final MethodExecutor NULL_ME = new MethodExecutor() {
@Override
public TypedValue execute(final EvaluationContext context, final Object target,
final Object... arguments) throws AccessException {
return null;
throw new UnsupportedOperationException("This method should never be called");
}
};
private static final class ImplicitMethodExecutor implements
MethodExecutor {
private static final class ImplicitMethodExecutor implements MethodExecutor {
private final MethodExecutor executor;
public ImplicitMethodExecutor(final MethodExecutor executor) {
this.executor = executor;
}
@Override
public TypedValue execute(final EvaluationContext context, final Object target,
final Object... arguments) throws AccessException {
Object[] modifiedArguments = new Object[arguments.length + 1];
@ -66,7 +67,7 @@ final class ImplicitMethodResolver implements MethodResolver {
public MethodExecutor resolve(
final EvaluationContext context, final Object targetObject,
final String name, final List<TypeDescriptor> argumentTypes)
throws AccessException {
throws AccessException {
if (targetObject == null) {
return null;
}

14
src/main/java/net/abhinavsarkar/spelhelper/ImplicitPropertyAccessor.java
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@ -34,13 +34,22 @@ final class ImplicitPropertyAccessor extends ReadOnlyGenericPropertyAccessor {
private static final ConcurrentHashMap<String, MethodExecutor> CACHE =
new ConcurrentHashMap<String, MethodExecutor>();
private static final MethodExecutor NULL_ME = new MethodExecutor() {
@Override
public TypedValue execute(final EvaluationContext context, final Object target,
final Object... arguments) throws AccessException {
throw new UnsupportedOperationException("This method should never be called");
}
};
@Override
public boolean canRead(final EvaluationContext context,
final Object target, final String name)
throws AccessException {
Assert.notNull(target, "target is null");
String cacheKey = target.getClass().getName() + "." + name;
if (CACHE.containsKey(cacheKey)) {
return CACHE.get(cacheKey) != null;
return CACHE.get(cacheKey) != NULL_ME;
}
for (MethodResolver mr : context.getMethodResolvers()) {
@ -52,10 +61,11 @@ final class ImplicitPropertyAccessor extends ReadOnlyGenericPropertyAccessor {
}
}
CACHE.putIfAbsent(cacheKey, null);
CACHE.putIfAbsent(cacheKey, NULL_ME);
return false;
}
@Override
public TypedValue read(final EvaluationContext context,
final Object target, final String name)
throws AccessException {

6
src/main/java/net/abhinavsarkar/spelhelper/ReadOnlyGenericPropertyAccessor.java
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@ -23,19 +23,21 @@ import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.PropertyAccessor;
abstract class ReadOnlyGenericPropertyAccessor implements
PropertyAccessor {
abstract class ReadOnlyGenericPropertyAccessor implements PropertyAccessor {
@Override
public final boolean canWrite(final EvaluationContext context,
final Object target, final String name) throws AccessException {
return false;
}
@Override
@SuppressWarnings("rawtypes")
public final Class[] getSpecificTargetClasses() {
return null;
}
@Override
public final void write(final EvaluationContext context, final Object target,
final String name, final Object newValue) throws AccessException {
throw new AccessException(MessageFormat.format(