src/main/java/org/apache/sling/launchpad/testservices/filters/TestFilter.java

package org.apache.sling.launchpad.testservices.filters;

import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/*
 * 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.
 */
/**
 * Example/test Filter.
 */
abstract class TestFilter implements Filter {
    
    private FilterConfig filterConfig;
    
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        String header = getHeaderName();
        AtomicInteger current = (AtomicInteger) ((HttpServletRequest)request).getAttribute(header);
        if (current == null) {
            current = new AtomicInteger(0);
            ((HttpServletRequest)request).setAttribute(header, current);
        }

        ((HttpServletResponse) response).setHeader(header, String.valueOf(current.incrementAndGet()));
        chain.doFilter(request, response);
    }

    public void destroy() {
    }

    protected abstract String getHeaderName();
}