// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.http.filter.chain;
import com.yahoo.jdisc.AbstractResource;
import com.yahoo.jdisc.application.ResourcePool;
import com.yahoo.jdisc.handler.ResponseHandler;
import com.yahoo.jdisc.http.HttpRequest;
import com.yahoo.jdisc.http.filter.RequestFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* @author Einar M R Rosenvinge
*/
public final class RequestFilterChain extends AbstractResource implements RequestFilter {
private final List filters = new ArrayList<>();
private final ResourcePool filterReferences = new ResourcePool();
private RequestFilterChain(Iterable extends RequestFilter> filters) {
for (RequestFilter filter : filters) {
this.filters.add(filter);
filterReferences.retain(filter);
}
}
@Override
public void filter(HttpRequest request, ResponseHandler responseHandler) {
ResponseHandlerGuard guard = new ResponseHandlerGuard(responseHandler);
for (int i = 0, len = filters.size(); i < len && !guard.isDone(); ++i) {
filters.get(i).filter(request, guard);
}
}
@Override
protected void destroy() {
filterReferences.release();
}
public static RequestFilter newInstance(RequestFilter... filters) {
return newInstance(Arrays.asList(filters));
}
public static RequestFilter newInstance(List extends RequestFilter> filters) {
if (filters.size() == 0) {
return EmptyRequestFilter.INSTANCE;
}
if (filters.size() == 1) {
return filters.get(0);
}
return new RequestFilterChain(filters);
}
}