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// 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.Request;
import com.yahoo.jdisc.Response;
import com.yahoo.jdisc.application.ResourcePool;
import com.yahoo.jdisc.http.filter.ResponseFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
*/
public final class ResponseFilterChain extends AbstractResource implements ResponseFilter {
private final List<ResponseFilter> filters = new ArrayList<>();
private final ResourcePool filterReferences = new ResourcePool();
private ResponseFilterChain(Iterable<? extends ResponseFilter> filters) {
for (ResponseFilter filter : filters) {
this.filters.add(filter);
filterReferences.retain(filter);
}
}
@Override
public void filter(Response response, Request request) {
for (ResponseFilter filter : filters) {
filter.filter(response, request);
}
}
@Override
protected void destroy() {
filterReferences.release();
}
public static ResponseFilter newInstance(ResponseFilter... filters) {
return newInstance(Arrays.asList(filters));
}
public static ResponseFilter newInstance(List<? extends ResponseFilter> filters) {
if (filters.size() == 0) {
return EmptyResponseFilter.INSTANCE;
}
if (filters.size() == 1) {
return filters.get(0);
}
return new ResponseFilterChain(filters);
}
}
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