/*
 * Copyright 2013-2021 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.cloud.sleuth.instrument.rsocket;

import io.netty.buffer.ByteBuf;
import io.netty.util.CharsetUtil;
import io.rsocket.metadata.CompositeMetadata;

import org.springframework.cloud.sleuth.propagation.Propagator;

class ByteBufGetter implements Propagator.Getter<ByteBuf> {

	@Override
	public String get(ByteBuf carrier, String key) {
		final CompositeMetadata compositeMetadata = new CompositeMetadata(carrier, false);
		for (CompositeMetadata.Entry entry : compositeMetadata) {
			if (key.equals(entry.getMimeType())) {
				return entry.getContent().toString(CharsetUtil.UTF_8);
			}
		}
		return null;
	}

}
