/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * Licensed 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 io.undertow.server.handlers;

import java.util.Collections;
import java.util.Map;
import java.util.Set;

import org.xnio.conduits.StreamSinkConduit;
import io.undertow.conduits.StoredResponseStreamSinkConduit;
import io.undertow.server.ConduitWrapper;
import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.builder.HandlerBuilder;
import io.undertow.util.ConduitFactory;

A handler that buffers the full response and attaches it to the exchange. This makes use of StoredResponseStreamSinkConduit 
 This will be made available once the response is fully complete, so should generally be read in an ExchangeCompletionListener 
Author:
Stuart Douglas/**
 * A handler that buffers the full response and attaches it to the exchange. This makes use of
 * {@link StoredResponseStreamSinkConduit}
 * <p>
 * This will be made available once the response is fully complete, so should generally
 * be read in an {@link io.undertow.server.ExchangeCompletionListener}
 *
 * @author Stuart Douglas
 */
public class StoredResponseHandler implements HttpHandler {

    private final HttpHandler next;

    public StoredResponseHandler(HttpHandler next) {
        this.next = next;
    }

    @Override
    public void handleRequest(HttpServerExchange exchange) throws Exception {
        exchange.addResponseWrapper(new ConduitWrapper<StreamSinkConduit>() {
            @Override
            public StreamSinkConduit wrap(ConduitFactory<StreamSinkConduit> factory, HttpServerExchange exchange) {
                return new StoredResponseStreamSinkConduit(factory.create(), exchange);
            }
        });
        next.handleRequest(exchange);
    }

    @Override
    public String toString() {
        return "store-response()";
    }

    public static class Builder implements HandlerBuilder {

        @Override
        public String name() {
            return "store-response";
        }

        @Override
        public Map<String, Class<?>> parameters() {
            return Collections.emptyMap();
        }

        @Override
        public Set<String> requiredParameters() {
            return Collections.emptySet();
        }

        @Override
        public String defaultParameter() {
            return null;
        }

        @Override
        public HandlerWrapper build(Map<String, Object> config) {
            return new HandlerWrapper() {
                @Override
                public HttpHandler wrap(HttpHandler handler) {
                    return new StoredResponseHandler(handler);
                }
            };
        }
    }

}