org.apache.wicket.request.flow.ResetResponseException.java Source code

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Here is the source code for org.apache.wicket.request.flow.ResetResponseException.java

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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.wicket.request.flow;

import org.apache.wicket.request.ILogData;
import org.apache.wicket.request.ILoggableRequestHandler;
import org.apache.wicket.request.IRequestCycle;
import org.apache.wicket.request.IRequestHandler;
import org.apache.wicket.request.IRequestHandlerDelegate;
import org.apache.wicket.request.RequestHandlerExecutor.ReplaceHandlerException;
import org.apache.wicket.request.handler.logger.DelegateLogData;
import org.apache.wicket.request.handler.logger.NoLogData;

/**
 * An exception that resets the response before executing the specified request handler
 * 
 * @author Igor Vaynberg (ivaynberg)
 * @author Jonathan Locke
 */
public abstract class ResetResponseException extends ReplaceHandlerException {
    private static final long serialVersionUID = 1L;

    /**
     * Construct.
     * 
     * @param handler
     */
    protected ResetResponseException(final IRequestHandler handler) {
        super(new ResponseResettingDecorator(handler), true);
    }

    private static class ResponseResettingDecorator
            implements IRequestHandler, IRequestHandlerDelegate, ILoggableRequestHandler {
        private final IRequestHandler delegate;

        private DelegateLogData logData;

        /**
         * Construct.
         * 
         * @param delegate
         */
        public ResponseResettingDecorator(final IRequestHandler delegate) {
            this.delegate = delegate;
        }

        @Override
        public void detach(final IRequestCycle requestCycle) {
            delegate.detach(requestCycle);

            if (logData == null) {
                ILogData delegateData;
                if (delegate instanceof ILoggableRequestHandler)
                    delegateData = ((ILoggableRequestHandler) delegate).getLogData();
                else
                    delegateData = new NoLogData();
                logData = new DelegateLogData(delegateData);
            }
        }

        @Override
        public void respond(final IRequestCycle requestCycle) {
            requestCycle.getResponse().reset();
            delegate.respond(requestCycle);
        }

        @Override
        public IRequestHandler getDelegateHandler() {
            return delegate;
        }

        /** {@inheritDoc} */
        @Override
        public DelegateLogData getLogData() {
            return logData;
        }
    }
}