// Copyright 2011, Google Inc. All Rights Reserved.
//
// Licensed 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 com.google.api.ads.common.lib.soap;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Base class for SOAP client handlers. Calling {@link #invoke(SoapCall)} will
* perform the method retrieved from {@link SoapCall#getSoapClientMethod()} on
* the {@link SoapCall#getSoapClient()} with the arguments retrieved from
* {@link SoapCall#getSoapArgs()}.
*
* @param <T> the SOAP client type
*
* @see SoapClientHandlerInterface
*/
public abstract class SoapClientHandler<T> implements SoapClientHandlerInterface<T> {
/**
* Default constructor.
*/
protected SoapClientHandler() {}
/**
* Processes the arguments such that they will be ready to be passed into the
* supplied SOAP client method. This method can be overridden in the case that
* a particular framework must additionally process the arguments.
* <p>
* In the default implementation of processing arguments, if the number of
* arguments is too small, the argument list will be padded with {@code null}.
* If {@code args} is {@code null}, {@code null} will be returned.
* </p>
*
* @param soapClientMethod the SOAP client method that will be called with the
* {@code args}
* @param args the arguments that will be processed
* @return the arguments ready to be passed into the {@code soapClientMethod}.
*/
protected Object[] processSoapArguments(Method soapClientMethod, Object[] args) {
List<Object> argsList = new ArrayList<Object>();
if (args != null) {
Collections.addAll(argsList, args);
} else {
return null;
}
int curretNumArgs = argsList.size();
while (curretNumArgs < soapClientMethod.getParameterTypes().length) {
argsList.add(null);
curretNumArgs++;
}
return argsList.toArray(new Object[0]);
}
/**
* Gets the method from the SOAP client that matches the supplied method.
* <p>
* In the default implementation, only the method name and return type
* will be matched.
* </p>
*
* @param soapClient the SOAP client within which to search for the method
* @param method the method to match
* @return the SOAP client's matching method
* @throws NoSuchMethodException thrown if the SOAP client does not contain
* the requested method.
*
* TODO(api.arogal): Needs to check parameter types as well as name/return.
*/
@Override
public Method getSoapClientMethod(T soapClient, Method method) throws NoSuchMethodException {
for (Method soapClientMethod : soapClient.getClass().getMethods()) {
if (method.getName().equals(soapClientMethod.getName())
&& method.getReturnType().equals(soapClientMethod.getReturnType())) {
return soapClientMethod;
}
}
throw new NoSuchMethodException("No method named " + method.getName() + " with return type "
+ method.getReturnType() + " found.");
}
/**
* Takes a {@link SoapCall} object and invokes the method by reflection.
*
* @param soapCall contains the SOAP method, SOAP client, and args to be
* called
* @return the response from the SOAP web service
* @throws Exception thrown if calling the operation on the remote service
* fails
*/
protected Object invoke(SoapCall<T> soapCall) throws Exception {
Method soapClientMethod = soapCall.getSoapClientMethod();
Object[] soapArgs = soapCall.getSoapArgs();
soapArgs = processSoapArguments(soapClientMethod, soapArgs);
return soapClientMethod.invoke(soapCall.getSoapClient(), soapArgs);
}
}