/*
* Copyright 2005-2010 the original author or authors.
*
* 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 org.springframework.ws.soap.security.callback;
import java.io.IOException;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;
/**
* Represents a chain of {@code CallbackHandler}s. For each callback, each of the handlers is called in term. If a
* handler throws a {@code UnsupportedCallbackException}, the next handler is tried.
*
* @author Arjen Poutsma
* @since 1.5.0
*/
public class CallbackHandlerChain extends AbstractCallbackHandler {
private final CallbackHandler[] callbackHandlers;
public CallbackHandlerChain(CallbackHandler[] callbackHandlers) {
this.callbackHandlers = callbackHandlers;
}
public CallbackHandler[] getCallbackHandlers() {
return callbackHandlers;
}
@Override
protected void handleInternal(Callback callback) throws IOException, UnsupportedCallbackException {
boolean allUnsupported = true;
for (CallbackHandler callbackHandler : callbackHandlers) {
try {
callbackHandler.handle(new Callback[]{callback});
allUnsupported = false;
}
catch (UnsupportedCallbackException ex) {
// if an UnsupportedCallbackException occurs, go to the next handler
}
}
if (allUnsupported) {
throw new UnsupportedCallbackException(callback);
}
}
}