/*
* 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.sling.engine.impl.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.request.RequestProgressTracker;
import org.apache.sling.engine.impl.request.RequestData;
public abstract class AbstractSlingFilterChain implements FilterChain {
private Filter[] filters;
private int current;
protected AbstractSlingFilterChain(Filter[] filters) {
this.filters = filters;
this.current = -1;
}
public void doFilter(ServletRequest request, ServletResponse response)
throws ServletException, IOException {
this.current++;
// the previous filter may have wrapped non-Sling request and response
// wrappers (e.g. WebCastellum does this), so we have to make
// sure the request and response are Sling types again
SlingHttpServletRequest slingRequest = toSlingRequest(request);
SlingHttpServletResponse slingResponse = toSlingResponse(response);
if (this.current < this.filters.length) {
// continue filtering with the next filter
Filter filter = this.filters[this.current];
trackFilter(slingRequest, filter);
filter.doFilter(slingRequest, slingResponse, this);
} else {
this.render(slingRequest, slingResponse);
}
}
protected abstract void render(SlingHttpServletRequest request,
SlingHttpServletResponse response) throws IOException,
ServletException;
// ---------- internal helper
private void trackFilter(ServletRequest request, Filter filter) {
RequestData data = RequestData.getRequestData(request);
if (data != null) {
RequestProgressTracker tracker = data.getRequestProgressTracker();
tracker.log("Calling filter: {0}",
this.filters[this.current].getClass().getName());
}
}
private SlingHttpServletRequest toSlingRequest(ServletRequest request) {
if (request instanceof SlingHttpServletRequest) {
return (SlingHttpServletRequest) request;
}
// wrap
return RequestData.toSlingHttpServletRequest(request);
}
private SlingHttpServletResponse toSlingResponse(ServletResponse response) {
if (response instanceof SlingHttpServletResponse) {
return (SlingHttpServletResponse) response;
}
// wrap
return RequestData.toSlingHttpServletResponse(response);
}
}