use of cn.taketoday.expression.EvaluationException in project today-infrastructure by TAKETODAY.
the class StandardComponentsTests method testStandardOperatorOverloader.
@Test
public void testStandardOperatorOverloader() throws EvaluationException {
OperatorOverloader oo = new StandardOperatorOverloader();
assertThat(oo.overridesOperation(Operation.ADD, null, null)).isFalse();
assertThatExceptionOfType(EvaluationException.class).isThrownBy(() -> oo.operate(Operation.ADD, 2, 3));
}
use of cn.taketoday.expression.EvaluationException in project today-infrastructure by TAKETODAY.
the class SetValueTests method setValue.
protected void setValue(String expression, Object value) {
try {
Expression e = parser.parseExpression(expression);
assertThat(e).isNotNull();
if (DEBUG) {
SpelUtilities.printAbstractSyntaxTree(System.out, e);
}
StandardEvaluationContext lContext = TestScenarioCreator.getTestEvaluationContext();
assertThat(e.isWritable(lContext)).as("Expression is not writeable but should be").isTrue();
e.setValue(lContext, value);
assertThat(e.getValue(lContext, value.getClass())).as("Retrieved value was not equal to set value").isEqualTo(value);
} catch (EvaluationException | ParseException ex) {
throw new AssertionError("Unexpected Exception: " + ex.getMessage(), ex);
}
}
use of cn.taketoday.expression.EvaluationException in project today-infrastructure by TAKETODAY.
the class ReflectiveConstructorResolver method resolve.
/**
* Locate a constructor on the type. There are three kinds of match that might occur:
* <ol>
* <li>An exact match where the types of the arguments match the types of the constructor
* <li>An in-exact match where the types we are looking for are subtypes of those defined on the constructor
* <li>A match where we are able to convert the arguments into those expected by the constructor, according to the
* registered type converter.
* </ol>
*/
@Override
@Nullable
public ConstructorExecutor resolve(EvaluationContext context, String typeName, List<TypeDescriptor> argumentTypes) throws AccessException {
try {
TypeConverter typeConverter = context.getTypeConverter();
Class<?> type = context.getTypeLocator().findType(typeName);
Constructor<?>[] ctors = type.getConstructors();
Arrays.sort(ctors, Comparator.comparingInt(Constructor::getParameterCount));
Constructor<?> closeMatch = null;
Constructor<?> matchRequiringConversion = null;
for (Constructor<?> ctor : ctors) {
int paramCount = ctor.getParameterCount();
List<TypeDescriptor> paramDescriptors = new ArrayList<>(paramCount);
for (int i = 0; i < paramCount; i++) {
paramDescriptors.add(new TypeDescriptor(new MethodParameter(ctor, i)));
}
ReflectionHelper.ArgumentsMatchInfo matchInfo = null;
if (ctor.isVarArgs() && argumentTypes.size() >= paramCount - 1) {
// *sigh* complicated
// Basically.. we have to have all parameters match up until the varargs one, then the rest of what is
// being provided should be
// the same type whilst the final argument to the method must be an array of that (oh, how easy...not) -
// or the final parameter
// we are supplied does match exactly (it is an array already).
matchInfo = ReflectionHelper.compareArgumentsVarargs(paramDescriptors, argumentTypes, typeConverter);
} else if (paramCount == argumentTypes.size()) {
// worth a closer look
matchInfo = ReflectionHelper.compareArguments(paramDescriptors, argumentTypes, typeConverter);
}
if (matchInfo != null) {
if (matchInfo.isExactMatch()) {
return new ReflectiveConstructorExecutor(ctor);
} else if (matchInfo.isCloseMatch()) {
closeMatch = ctor;
} else if (matchInfo.isMatchRequiringConversion()) {
matchRequiringConversion = ctor;
}
}
}
if (closeMatch != null) {
return new ReflectiveConstructorExecutor(closeMatch);
} else if (matchRequiringConversion != null) {
return new ReflectiveConstructorExecutor(matchRequiringConversion);
} else {
return null;
}
} catch (EvaluationException ex) {
throw new AccessException("Failed to resolve constructor", ex);
}
}
use of cn.taketoday.expression.EvaluationException in project today-infrastructure by TAKETODAY.
the class ReflectiveMethodResolver method resolve.
/**
* Locate a method on a type. There are three kinds of match that might occur:
* <ol>
* <li>an exact match where the types of the arguments match the types of the constructor
* <li>an in-exact match where the types we are looking for are subtypes of those defined on the constructor
* <li>a match where we are able to convert the arguments into those expected by the constructor,
* according to the registered type converter
* </ol>
*/
@Override
@Nullable
public MethodExecutor resolve(EvaluationContext context, Object targetObject, String name, List<TypeDescriptor> argumentTypes) throws AccessException {
try {
TypeConverter typeConverter = context.getTypeConverter();
Class<?> type = (targetObject instanceof Class ? (Class<?>) targetObject : targetObject.getClass());
ArrayList<Method> methods = new ArrayList<>(getMethods(type, targetObject));
// If a filter is registered for this type, call it
MethodFilter filter = (this.filters != null ? this.filters.get(type) : null);
if (filter != null) {
List<Method> filtered = filter.filter(methods);
methods = (filtered instanceof ArrayList ? (ArrayList<Method>) filtered : new ArrayList<>(filtered));
}
// Sort methods into a sensible order
if (methods.size() > 1) {
methods.sort((m1, m2) -> {
int m1pl = m1.getParameterCount();
int m2pl = m2.getParameterCount();
// vararg methods go last
if (m1pl == m2pl) {
if (!m1.isVarArgs() && m2.isVarArgs()) {
return -1;
} else if (m1.isVarArgs() && !m2.isVarArgs()) {
return 1;
} else {
return 0;
}
}
return Integer.compare(m1pl, m2pl);
});
}
// Resolve any bridge methods
for (int i = 0; i < methods.size(); i++) {
methods.set(i, BridgeMethodResolver.findBridgedMethod(methods.get(i)));
}
// Remove duplicate methods (possible due to resolved bridge methods)
Set<Method> methodsToIterate = new LinkedHashSet<>(methods);
Method closeMatch = null;
int closeMatchDistance = Integer.MAX_VALUE;
Method matchRequiringConversion = null;
boolean multipleOptions = false;
for (Method method : methodsToIterate) {
if (method.getName().equals(name)) {
int paramCount = method.getParameterCount();
List<TypeDescriptor> paramDescriptors = new ArrayList<>(paramCount);
for (int i = 0; i < paramCount; i++) {
paramDescriptors.add(new TypeDescriptor(new MethodParameter(method, i)));
}
ReflectionHelper.ArgumentsMatchInfo matchInfo = null;
if (method.isVarArgs() && argumentTypes.size() >= (paramCount - 1)) {
// *sigh* complicated
matchInfo = ReflectionHelper.compareArgumentsVarargs(paramDescriptors, argumentTypes, typeConverter);
} else if (paramCount == argumentTypes.size()) {
// Name and parameter number match, check the arguments
matchInfo = ReflectionHelper.compareArguments(paramDescriptors, argumentTypes, typeConverter);
}
if (matchInfo != null) {
if (matchInfo.isExactMatch()) {
return new ReflectiveMethodExecutor(method, type);
} else if (matchInfo.isCloseMatch()) {
if (this.useDistance) {
int matchDistance = ReflectionHelper.getTypeDifferenceWeight(paramDescriptors, argumentTypes);
if (closeMatch == null || matchDistance < closeMatchDistance) {
// This is a better match...
closeMatch = method;
closeMatchDistance = matchDistance;
}
} else {
// Take this as a close match if there isn't one already
if (closeMatch == null) {
closeMatch = method;
}
}
} else if (matchInfo.isMatchRequiringConversion()) {
if (matchRequiringConversion != null) {
multipleOptions = true;
}
matchRequiringConversion = method;
}
}
}
}
if (closeMatch != null) {
return new ReflectiveMethodExecutor(closeMatch, type);
} else if (matchRequiringConversion != null) {
if (multipleOptions) {
throw new SpelEvaluationException(SpelMessage.MULTIPLE_POSSIBLE_METHODS, name);
}
return new ReflectiveMethodExecutor(matchRequiringConversion, type);
} else {
return null;
}
} catch (EvaluationException ex) {
throw new AccessException("Failed to resolve method", ex);
}
}
use of cn.taketoday.expression.EvaluationException in project today-framework by TAKETODAY.
the class ExpressionLanguageScenarioTests method testScenario_UsingStandardInfrastructure.
/**
* Scenario: using the standard infrastructure and running simple expression evaluation.
*/
@Test
public void testScenario_UsingStandardInfrastructure() {
try {
// Create a parser
SpelExpressionParser parser = new SpelExpressionParser();
// Parse an expression
Expression expr = parser.parseRaw("new String('hello world')");
// Evaluate it using a 'standard' context
Object value = expr.getValue();
// They are reusable
value = expr.getValue();
assertThat(value).isEqualTo("hello world");
assertThat(value.getClass()).isEqualTo(String.class);
} catch (EvaluationException | ParseException ex) {
throw new AssertionError(ex.getMessage(), ex);
}
}
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