/*
* *************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
* *************************************************************************************
*/
package com.espertech.esper.util;
import com.espertech.esper.client.dataflow.EPDataFlowOperatorParameterProvider;
import com.espertech.esper.client.dataflow.EPDataFlowOperatorParameterProviderContext;
import com.espertech.esper.dataflow.annotations.DataFlowOpParameter;
import com.espertech.esper.epl.core.EngineImportService;
import com.espertech.esper.epl.expression.*;
import com.espertech.esper.event.WriteablePropertyDescriptor;
import com.espertech.esper.event.bean.PropertyHelper;
import com.espertech.esper.event.property.MappedProperty;
import com.espertech.esper.event.property.Property;
import com.espertech.esper.event.property.PropertyParser;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
public class PopulateUtil {
private final static String CLASS_PROPERTY_NAME = "class";
private final static String SYSTEM_PROPETIES_NAME = "systemProperties".toLowerCase();
private static Log log = LogFactory.getLog(PopulateUtil.class);
public static Object instantiatePopulateObject(Map<String, Object> objectProperties, Class topClass, EngineImportService engineImportService) throws ExprValidationException {
Class applicableClass = topClass;
if (topClass.isInterface()) {
applicableClass = findInterfaceImplementation(objectProperties, topClass, engineImportService);
}
Object top;
try {
top = applicableClass.newInstance();
}
catch (RuntimeException e) {
throw new ExprValidationException("Exception instantiating class " + applicableClass.getName() + ": " + e.getMessage(), e);
}
catch (InstantiationException e) {
throw new ExprValidationException(getMessageExceptionInstantiating(applicableClass), e);
}
catch (IllegalAccessException e) {
throw new ExprValidationException("Illegal access to construct class " + applicableClass.getName() + ": " + e.getMessage(), e);
}
populateObject(topClass.getSimpleName(), 0, topClass.getSimpleName(), objectProperties, top, engineImportService, null, null);
return top;
}
public static void populateObject(String operatorName, int operatorNum, String dataFlowName, Map<String, Object> objectProperties, Object top, EngineImportService engineImportService, EPDataFlowOperatorParameterProvider optionalParameterProvider, Map<String, Object> optionalParameterURIs)
throws ExprValidationException
{
Class applicableClass = top.getClass();
Set<WriteablePropertyDescriptor> writables = PropertyHelper.getWritableProperties(applicableClass);
Set<Field> annotatedFields = JavaClassHelper.findAnnotatedFields(top.getClass(), DataFlowOpParameter.class);
Set<Method> annotatedMethods = JavaClassHelper.findAnnotatedMethods(top.getClass(), DataFlowOpParameter.class);
// find catch-all methods
Set<Method> catchAllMethods = new LinkedHashSet<Method>();
if (annotatedMethods != null) {
for (Method method : annotatedMethods) {
DataFlowOpParameter anno = (DataFlowOpParameter) JavaClassHelper.getAnnotations(DataFlowOpParameter.class, method.getDeclaredAnnotations()).get(0);
if (anno.all()) {
if (method.getParameterTypes().length == 2 && method.getParameterTypes()[0] == String.class && method.getParameterTypes()[1] == Object.class) {
catchAllMethods.add(method);
continue;
}
throw new ExprValidationException("Invalid annotation for catch-call");
}
}
}
// map provided values
for (Map.Entry<String, Object> property : objectProperties.entrySet()) {
boolean found = false;
String propertyName = property.getKey();
// invoke catch-all setters
for (Method method : catchAllMethods) {
try {
method.invoke(top, new Object[] {propertyName, property.getValue()});
}
catch (IllegalAccessException e) {
throw new ExprValidationException("Illegal access invoking method for property '" + propertyName + "' for class " + applicableClass.getName() + " method " + method.getName(), e);
}
catch (InvocationTargetException e) {
throw new ExprValidationException("Exception invoking method for property '" + propertyName + "' for class " + applicableClass.getName() + " method " + method.getName() + ": " + e.getTargetException().getMessage(), e);
}
found = true;
}
if (propertyName.toLowerCase().equals(CLASS_PROPERTY_NAME)) {
continue;
}
// use the writeable property descriptor (appropriate setter method) from writing the property
WriteablePropertyDescriptor descriptor = findDescriptor(applicableClass, propertyName, writables);
if (descriptor != null) {
Object coerceProperty = coerceProperty(propertyName, applicableClass, property.getValue(), descriptor.getType(), engineImportService, false);
try {
descriptor.getWriteMethod().invoke(top, new Object[] {coerceProperty});
}
catch (IllegalArgumentException e) {
throw new ExprValidationException("Illegal argument invoking setter method for property '" + propertyName + "' for class " + applicableClass.getName() + " method " + descriptor.getWriteMethod().getName() + " provided value " + coerceProperty, e);
}
catch (IllegalAccessException e) {
throw new ExprValidationException("Illegal access invoking setter method for property '" + propertyName + "' for class " + applicableClass.getName() + " method " + descriptor.getWriteMethod().getName(), e);
}
catch (InvocationTargetException e) {
throw new ExprValidationException("Exception invoking setter method for property '" + propertyName + "' for class " + applicableClass.getName() + " method " + descriptor.getWriteMethod().getName() + ": " + e.getTargetException().getMessage(), e);
}
continue;
}
// find the field annotated with {@link @GraphOpProperty}
for (Field annotatedField : annotatedFields) {
DataFlowOpParameter anno = (DataFlowOpParameter) JavaClassHelper.getAnnotations(DataFlowOpParameter.class, annotatedField.getDeclaredAnnotations()).get(0);
if (anno.name().equals(propertyName) || annotatedField.getName().equals(propertyName)) {
Object coerceProperty = coerceProperty(propertyName, applicableClass, property.getValue(), annotatedField.getType(), engineImportService, true);
try {
annotatedField.setAccessible(true);
annotatedField.set(top, coerceProperty);
}
catch (Exception e) {
throw new ExprValidationException("Failed to set field '" + annotatedField.getName() + "': " + e.getMessage(), e);
}
found = true;
break;
}
}
if (found) {
continue;
}
throw new ExprValidationException("Failed to find writable property '" + propertyName + "' for class " + applicableClass.getName());
}
// second pass: if a parameter URI - value pairs were provided, check that
if (optionalParameterURIs != null) {
for (Field annotatedField : annotatedFields) {
try {
annotatedField.setAccessible(true);
String uri = operatorName + "/" + annotatedField.getName();
if (optionalParameterURIs.containsKey(uri)) {
Object value = optionalParameterURIs.get(uri);
annotatedField.set(top, value);
if (log.isDebugEnabled()) {
log.debug("Found parameter '" + uri + "' for data flow " + dataFlowName + " setting " + value);
}
}
else {
if (log.isDebugEnabled()) {
log.debug("Not found parameter '" + uri + "' for data flow " + dataFlowName);
}
}
}
catch (Exception e) {
throw new ExprValidationException("Failed to set field '" + annotatedField.getName() + "': " + e.getMessage(), e);
}
}
}
// third pass: if a parameter provider is provided, use that
if (optionalParameterProvider != null) {
for (Field annotatedField : annotatedFields) {
try {
annotatedField.setAccessible(true);
Object provided = annotatedField.get(top);
Object value = optionalParameterProvider.provide(new EPDataFlowOperatorParameterProviderContext(operatorName, annotatedField.getName(), top, operatorNum, provided, dataFlowName));
if (value != null) {
annotatedField.set(top, value);
}
}
catch (Exception e) {
throw new ExprValidationException("Failed to set field '" + annotatedField.getName() + "': " + e.getMessage(), e);
}
}
}
}
private static Class findInterfaceImplementation(Map<String, Object> properties, Class topClass, EngineImportService engineImportService) throws ExprValidationException {
String message = "Failed to find implementation for interface " + topClass.getName();
// Allow to populate the special "class" field
if (!properties.containsKey(CLASS_PROPERTY_NAME)) {
throw new ExprValidationException(message + ", for interfaces please specified the '" + CLASS_PROPERTY_NAME + "' field that provides the class name either as a simple class name or fully qualified");
}
Class clazz = null;
String className = (String) properties.get(CLASS_PROPERTY_NAME);
try {
clazz = JavaClassHelper.getClassForName(className);
}
catch (ClassNotFoundException e) {
if (!className.contains(".")) {
className = topClass.getPackage().getName() + "." + className;
try {
clazz = JavaClassHelper.getClassForName(className);
}
catch (ClassNotFoundException ex) {
}
}
if (clazz == null) {
throw new ExprValidationPropertyException(message + ", could not find class by name '" + className + "'");
}
}
if (!JavaClassHelper.isSubclassOrImplementsInterface(clazz, topClass)) {
throw new ExprValidationException(message + ", class " + JavaClassHelper.getClassNameFullyQualPretty(clazz) + " does not implement the interface");
}
return clazz;
}
private static Object coerceProperty(String propertyName, Class containingType, Object value, Class type, EngineImportService engineImportService, boolean forceNumeric) throws ExprValidationException {
if (value instanceof ExprNode && type != ExprNode.class) {
if (value instanceof ExprIdentNode) {
ExprIdentNode identNode = (ExprIdentNode) value;
Property prop;
try {
prop = PropertyParser.parse(identNode.getFullUnresolvedName(), false);
}
catch (Exception ex) {
throw new ExprValidationException("Failed to parse property '" + identNode.getFullUnresolvedName() + "'");
}
if (!(prop instanceof MappedProperty)) {
throw new ExprValidationException("Unrecognized property '" + identNode.getFullUnresolvedName() + "'");
}
MappedProperty mappedProperty = (MappedProperty) prop;
if (mappedProperty.getPropertyNameAtomic().toLowerCase().equals(SYSTEM_PROPETIES_NAME)) {
return System.getProperty(mappedProperty.getKey());
}
}
else {
ExprNode exprNode = (ExprNode) value;
ExprEvaluator evaluator = exprNode.getExprEvaluator();
if (evaluator == null) {
throw new ExprValidationException("Failed to evaluate expression '" + exprNode.toExpressionString() + "'");
}
value = evaluator.evaluate(null, true, null);
}
}
if (value == null) {
return null;
}
if (value.getClass() == type) {
return value;
}
if (JavaClassHelper.isAssignmentCompatible(value.getClass(), type)) {
if (forceNumeric && JavaClassHelper.getBoxedType(value.getClass()) != JavaClassHelper.getBoxedType(type) && JavaClassHelper.isNumeric(type) && JavaClassHelper.isNumeric(value.getClass())) {
value = JavaClassHelper.coerceBoxed((Number) value, JavaClassHelper.getBoxedType(type));
}
return value;
}
if (JavaClassHelper.isSubclassOrImplementsInterface(value.getClass(), type)) {
return value;
}
if (type.isArray()) {
if (!(value instanceof Collection)) {
throw new ExprValidationException("Property '" + propertyName + "' of class " + JavaClassHelper.getClassNameFullyQualPretty(containingType) + " expects an array but receives a value of type " + value.getClass().getName());
}
Object[] items = ((Collection) value).toArray();
Object coercedArray = Array.newInstance(type.getComponentType(), items.length);
for (int i = 0; i < items.length; i++) {
Object coercedValue = coerceProperty(propertyName + " (array element)", type, items[i], type.getComponentType(), engineImportService, false);
Array.set(coercedArray, i, coercedValue);
}
return coercedArray;
}
if (!(value instanceof Map)) {
throw new ExprValidationException("Property '" + propertyName + "' of class " + JavaClassHelper.getClassNameFullyQualPretty(containingType) + " expects an " + JavaClassHelper.getClassNameFullyQualPretty(type) + " but receives a value of type " + value.getClass().getName());
}
Map<String, Object> props = (Map<String, Object>) value;
return instantiatePopulateObject(props, type, engineImportService);
}
private static WriteablePropertyDescriptor findDescriptor(Class clazz, String propertyName, Set<WriteablePropertyDescriptor> writables)
throws ExprValidationException {
for (WriteablePropertyDescriptor desc : writables) {
if (desc.getPropertyName().toLowerCase().equals(propertyName.toLowerCase())) {
return desc;
}
}
return null;
}
private static String getMessageExceptionInstantiating(Class clazz) {
return "Exception instantiating class " + clazz.getName() + ", please make sure the class has a public no-arg constructor (and for inner classes is declared static)";
}
}