Examples with TypeConverter org.springframework.expression.TypeConverter used on opensource projects

Example 1 with TypeConverter

use of org.springframework.expression.TypeConverter in project spring-framework by spring-projects.

the class FunctionReference method executeFunctionJLRMethod.

/**
	 * Execute a function represented as a java.lang.reflect.Method.
	 * @param state the expression evaluation state
	 * @param method the method to invoke
	 * @return the return value of the invoked Java method
	 * @throws EvaluationException if there is any problem invoking the method
	 */
private TypedValue executeFunctionJLRMethod(ExpressionState state, Method method) throws EvaluationException {
    this.method = null;
    Object[] functionArgs = getArguments(state);
    if (!method.isVarArgs() && method.getParameterCount() != functionArgs.length) {
        throw new SpelEvaluationException(SpelMessage.INCORRECT_NUMBER_OF_ARGUMENTS_TO_FUNCTION, functionArgs.length, method.getParameterCount());
    }
    // Only static methods can be called in this way
    if (!Modifier.isStatic(method.getModifiers())) {
        throw new SpelEvaluationException(getStartPosition(), SpelMessage.FUNCTION_MUST_BE_STATIC, ClassUtils.getQualifiedMethodName(method), this.name);
    }
    argumentConversionOccurred = false;
    // Convert arguments if necessary and remap them for varargs if required
    if (functionArgs != null) {
        TypeConverter converter = state.getEvaluationContext().getTypeConverter();
        argumentConversionOccurred = ReflectionHelper.convertAllArguments(converter, functionArgs, method);
    }
    if (method.isVarArgs()) {
        functionArgs = ReflectionHelper.setupArgumentsForVarargsInvocation(method.getParameterTypes(), functionArgs);
    }
    try {
        ReflectionUtils.makeAccessible(method);
        Object result = method.invoke(method.getClass(), functionArgs);
        if (!argumentConversionOccurred) {
            this.method = method;
            this.exitTypeDescriptor = CodeFlow.toDescriptor(method.getReturnType());
        }
        return new TypedValue(result, new TypeDescriptor(new MethodParameter(method, -1)).narrow(result));
    } catch (Exception ex) {
        throw new SpelEvaluationException(getStartPosition(), ex, SpelMessage.EXCEPTION_DURING_FUNCTION_CALL, this.name, ex.getMessage());
    }
}

Example 2 with TypeConverter

use of org.springframework.expression.TypeConverter in project spring-framework by spring-projects.

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
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, new Comparator<Constructor<?>>() {

            @Override
            public int compare(Constructor<?> c1, Constructor<?> c2) {
                int c1pl = c1.getParameterCount();
                int c2pl = c2.getParameterCount();
                return (c1pl < c2pl ? -1 : (c1pl > c2pl ? 1 : 0));
            }
        });
        Constructor<?> closeMatch = null;
        Constructor<?> matchRequiringConversion = null;
        for (Constructor<?> ctor : ctors) {
            Class<?>[] paramTypes = ctor.getParameterTypes();
            List<TypeDescriptor> paramDescriptors = new ArrayList<>(paramTypes.length);
            for (int i = 0; i < paramTypes.length; i++) {
                paramDescriptors.add(new TypeDescriptor(new MethodParameter(ctor, i)));
            }
            ReflectionHelper.ArgumentsMatchInfo matchInfo = null;
            if (ctor.isVarArgs() && argumentTypes.size() >= paramTypes.length - 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 (paramTypes.length == 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);
    }
}

Example 3 with TypeConverter

use of org.springframework.expression.TypeConverter in project spring-framework by spring-projects.

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
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());
        List<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 ? filtered : new ArrayList<>(filtered));
        }
        // Sort methods into a sensible order
        if (methods.size() > 1) {
            Collections.sort(methods, new Comparator<Method>() {

                @Override
                public int compare(Method m1, Method m2) {
                    int m1pl = m1.getParameterCount();
                    int m2pl = m2.getParameterCount();
                    // varargs 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 (m1pl < m2pl ? -1 : (m1pl > m2pl ? 1 : 0));
                }
            });
        }
        // 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)) {
                Class<?>[] paramTypes = method.getParameterTypes();
                List<TypeDescriptor> paramDescriptors = new ArrayList<>(paramTypes.length);
                for (int i = 0; i < paramTypes.length; i++) {
                    paramDescriptors.add(new TypeDescriptor(new MethodParameter(method, i)));
                }
                ReflectionHelper.ArgumentsMatchInfo matchInfo = null;
                if (method.isVarArgs() && argumentTypes.size() >= (paramTypes.length - 1)) {
                    // *sigh* complicated
                    matchInfo = ReflectionHelper.compareArgumentsVarargs(paramDescriptors, argumentTypes, typeConverter);
                } else if (paramTypes.length == 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);
                    } 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);
        } else if (matchRequiringConversion != null) {
            if (multipleOptions) {
                throw new SpelEvaluationException(SpelMessage.MULTIPLE_POSSIBLE_METHODS, name);
            }
            return new ReflectiveMethodExecutor(matchRequiringConversion);
        } else {
            return null;
        }
    } catch (EvaluationException ex) {
        throw new AccessException("Failed to resolve method", ex);
    }
}

Example 4 with TypeConverter

use of org.springframework.expression.TypeConverter in project spring-framework by spring-projects.

the class OpPlus method convertTypedValueToString.

/**
	 * Convert operand value to string using registered converter or using
	 * {@code toString} method.
	 * @param value typed value to be converted
	 * @param state expression state
	 * @return {@code TypedValue} instance converted to {@code String}
	 */
private static String convertTypedValueToString(TypedValue value, ExpressionState state) {
    TypeConverter typeConverter = state.getEvaluationContext().getTypeConverter();
    TypeDescriptor typeDescriptor = TypeDescriptor.valueOf(String.class);
    if (typeConverter.canConvert(value.getTypeDescriptor(), typeDescriptor)) {
        return String.valueOf(typeConverter.convertValue(value.getValue(), value.getTypeDescriptor(), typeDescriptor));
    }
    return String.valueOf(value.getValue());
}

Example 5 with TypeConverter

use of org.springframework.expression.TypeConverter in project spring-framework by spring-projects.

the class StandardComponentsTests method testStandardTypeConverter.

@Test
public void testStandardTypeConverter() throws EvaluationException {
    TypeConverter tc = new StandardTypeConverter();
    tc.convertValue(3, TypeDescriptor.forObject(3), TypeDescriptor.valueOf(Double.class));
}