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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.interfacedef.java.impl;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Interface;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.java.JavaOperation;
/**
* Contains methods for mapping between an operation in a
* {@link org.apache.tuscany.spi.model.ServiceContract} and a method defined by
* a Java interface
*
* @version $Rev$ $Date$
*/
public final class JavaInterfaceUtil {
private JavaInterfaceUtil() {
}
/**
* Return the method on the implementation class that matches the operation.
*
* @param implClass the implementation class or interface
* @param operation the operation to match
* @return the method described by the operation
* @throws NoSuchMethodException if no such method exists
* @Deprecated
*/
public static Method findMethod(Class<?> implClass, Operation operation) throws NoSuchMethodException {
String name = operation.getName();
if (operation instanceof JavaOperation) {
name = ((JavaOperation)operation).getJavaMethod().getName();
}
Interface interface1 = operation.getInterface();
int numParams = operation.getInputType().getLogical().size();
if (interface1 != null && interface1.isRemotable()) {
List<Method> matchingMethods = new ArrayList<Method>();
for (Method m : implClass.getMethods()) {
if (m.getName().equals(name) && m.getParameterTypes().length == numParams) {
matchingMethods.add(m);
}
}
// TUSCANY-2180 If there is only one method then we just match on the name
// (this is the same as the existing behaviour)
if (matchingMethods.size() == 1) {
return matchingMethods.get(0);
}
if (matchingMethods.size() > 1) {
// TUSCANY-2180 We need to check the parameter types too
Class<?>[] paramTypes = getPhysicalTypes(operation);
return implClass.getMethod(name, paramTypes);
}
// No matching method found
throw new NoSuchMethodException("No matching method for operation " + operation.getName()
+ " is found on "
+ implClass);
}
Class<?>[] paramTypes = getPhysicalTypes(operation);
return implClass.getMethod(name, paramTypes);
}
/**
* @Deprecated
*/
private static Class<?>[] getPhysicalTypes(Operation operation) {
DataType<List<DataType>> inputType = operation.getInputType();
if (inputType == null) {
return new Class<?>[] {};
}
List<DataType> types = inputType.getLogical();
Class<?>[] javaTypes = new Class<?>[types.size()];
for (int i = 0; i < javaTypes.length; i++) {
DataType<?> type = types.get(i);
javaTypes[i] = getClassOfDataType(type);
}
return javaTypes;
}
/**
* Get the Java Type that represent the DataType informed
* When dataType.getGenericType() is GenericArrayType or WildcardType the Physical type is used,
* because the physical type have the correct information about this DataType.
* @param dataType DataType
* @return The Class<?> that represent the DataType
*/
private static Class<?> getClassOfDataType(DataType<?> dataType){
Type generic = dataType.getGenericType();
boolean isGeneric = (generic != null
&& generic != dataType.getPhysical()
&& (generic instanceof TypeVariable<?>
|| generic instanceof ParameterizedType));
Class<?> javaType = null;
if (isGeneric) {
javaType = getClassOfSimpleGeneric(generic);
}else {
Type physical = dataType.getPhysical();
javaType = getClassOfPhysical(physical);
}
if (javaType == null) {
throw new UnsupportedOperationException();
}
return javaType;
}
/**
* Return Class<?> of Type Generic informed
* @param generic The Generic Type
* @return The Class<?> that represent the Generic
*/
private static Class<?> getClassOfSimpleGeneric(Type generic){
Class<?> javaType = null;
if (generic instanceof TypeVariable<?>){
javaType = (Class<?>)Object.class;
} else if (generic instanceof ParameterizedType){
javaType = (Class<?>)((ParameterizedType)generic).getRawType();
}
return javaType;
}
/**
* Return Class<?> of Type Physical informed
* @param physical The Physical
* @return The Class<?> that represent the Physical
*/
private static Class<?> getClassOfPhysical(Type physical){
Class<?> javaType = null;
if (physical instanceof Class<?>) {
javaType = (Class<?>)physical;
}
return javaType;
}
/**
* Searches a collection of operations for a match against the given method
*
* @param method the method to match
* @param operations the operations to match against
* @return a matching operation or null
* @Deprecated
*/
public static Operation findOperation(Method method, Collection<Operation> operations) {
for (Operation operation : operations) {
if (match(operation, method)) {
return operation;
}
}
return null;
}
/**
* Determines if the given operation matches the given method
*
* @return true if the operation matches, false if does not
*/
private static boolean match(Operation operation, Method method) {
Class<?>[] params = method.getParameterTypes();
DataType<List<DataType>> inputType = operation.getInputType();
List<DataType> types = inputType.getLogical();
boolean found = true;
if (types.size() == params.length && method.getName().equals(operation.getName())) {
for (int i = 0; i < params.length; i++) {
Class<?> clazz = params[i];
if (!clazz.equals(operation.getInputType().getLogical().get(i).getPhysical())) {
found = false;
}
}
} else {
found = false;
}
return found;
}
private static String getPackageName(Class<?> cls) {
String name = cls.getName();
int index = name.lastIndexOf('.');
return index == -1 ? "" : name.substring(0, index);
}
public static String getNamespace(Class<?> cls) {
String packageName = getPackageName(cls);
if ("".equals(packageName)) {
return "";
}
StringBuffer ns = new StringBuffer("http://");
String[] names = packageName.split("\\.");
for (int i = names.length - 1; i >= 0; i--) {
ns.append(names[i]);
if (i != 0) {
ns.append('.');
}
}
ns.append('/');
return ns.toString();
}
}
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