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Inverno HTTP 1.x/2 server module
There is a newer version: 1.11.0
/*
 * Copyright 2020 Jeremy KUHN
 *
 * 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.inverno.mod.http.server.internal.http2;

import io.inverno.mod.base.converter.ObjectConverter;
import io.inverno.mod.http.base.OutboundHeaders;
import io.inverno.mod.http.base.Parameter;
import io.inverno.mod.http.base.header.Header;
import io.inverno.mod.http.base.header.HeaderService;
import io.inverno.mod.http.base.internal.GenericParameter;
import io.netty.handler.codec.http2.DefaultHttp2Headers;
import io.netty.handler.codec.http2.Http2Headers;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * 
 * HTTP/2 response trailers implementation.
 * 
 * 
 * @author Jeremy Kuhn
 * @since 1.0
 */
class Http2ResponseTrailers implements OutboundHeaders {

	private final HeaderService headerService;
	private final ObjectConverter parameterConverter;
	
	private final Http2Headers underlyingTrailers;
	
	private boolean written;
	
	/**
	 * 
	 * Creates HTTP/2 response trailers.
	 * 
	 * 
	 * @param headerService the header service
	 * @param parameterConverter a string object converter 
	 */
	public Http2ResponseTrailers(HeaderService headerService, ObjectConverter parameterConverter) {
		this.headerService = headerService;
		this.parameterConverter = parameterConverter;
		
		this.underlyingTrailers = new DefaultHttp2Headers();
	}

	/**
	 * 
	 * Returns the underlying headers.
	 * 
	 * 
	 * @return the underlying headers
	 */
	Http2Headers getUnderlyingTrailers() {
		return this.underlyingTrailers;
	}

	public void setWritten(boolean written) {
		this.written = written;
	}
	
	@Override
	public boolean isWritten() {
		return this.written;
	}

	@Override
	public Http2ResponseTrailers add(CharSequence name, CharSequence value) {
		this.underlyingTrailers.add(name, value);
		return this;
	}

	@Override
	public Http2ResponseTrailers add(Header... trailers) {
		for(Header trailer : trailers) {
			this.underlyingTrailers.add(trailer.getHeaderName(), trailer.getHeaderValue());
		}
		return this;
	}

	@Override
	public Http2ResponseTrailers set(CharSequence name, CharSequence value) {
		this.underlyingTrailers.set(name, value);
		return this;
	}

	@Override
	public Http2ResponseTrailers set(Header... trailers) {
		for(Header trailer : trailers) {
			this.underlyingTrailers.set(trailer.getHeaderName(), trailer.getHeaderValue());
		}
		return this;
	}

	@Override
	public Http2ResponseTrailers remove(CharSequence... names) {
		for(CharSequence name : names) {
			this.underlyingTrailers.remove(name);
		}
		return this;
	}

	@Override
	public boolean contains(CharSequence name) {
		return this.underlyingTrailers.contains(name);
	}
	
	@Override
	public boolean contains(CharSequence name, CharSequence value) {
		return this.underlyingTrailers.contains(name, value, true);
	}
	
	@Override
	public Set getNames() {
		return this.underlyingTrailers.names().stream().map(CharSequence::toString).collect(Collectors.toSet());
	}

	@Override
	public Optional get(CharSequence name) {
		return Optional.of(this.underlyingTrailers.get(name)).map(Object::toString);
	}

	@Override
	public List getAll(CharSequence name) {
		return this.underlyingTrailers.getAll(name).stream().map(CharSequence::toString).collect(Collectors.toList());
	}

	@Override
	public List> getAll() {
		List> result = new LinkedList<>();
		this.underlyingTrailers.forEach(e -> {
			result.add(Map.entry(e.getKey().toString(), e.getValue().toString()));
		});
		return result;
	}

	@Override
	public  Optional getHeader(CharSequence name) {
		return this.get(name).map(value -> this.headerService.decode(name.toString(), value));
	}

	@Override
	public  List getAllHeader(CharSequence name) {
		return this.underlyingTrailers.getAll(name).stream().map(value -> this.headerService.decode(name.toString(), value.toString())).collect(Collectors.toList());
	}

	@Override
	public List getAllHeader() {
		List result = new LinkedList<>();
		this.underlyingTrailers.forEach(e -> {
			result.add(this.headerService.decode(e.getKey().toString(), e.getValue().toString()));
		});
		return result;
	}
	
	@Override
	public Optional getParameter(CharSequence name) {
		return this.get(name).map(value -> new GenericParameter(name.toString(), value, this.parameterConverter));
	}
	
	@Override
	public List getAllParameter(CharSequence name) {
		return this.underlyingTrailers.getAll(name).stream().map(value -> new GenericParameter(name.toString(), value.toString(), this.parameterConverter)).collect(Collectors.toList());
	}
	
	@Override
	public List getAllParameter() {
		List result = new LinkedList<>();
		this.underlyingTrailers.forEach(e -> {
			result.add(new GenericParameter(e.getKey().toString(), e.getValue().toString(), this.parameterConverter));
		});
		return result;
	}
}