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Apache CXF Observability using Micrometer Observation

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.cxf.tracing.micrometer;

import java.net.URI;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.cxf.helpers.CastUtils;
import org.apache.cxf.message.Message;
import org.apache.cxf.message.MessageUtils;
import org.apache.cxf.tracing.AbstractTracingProvider;

class ParsedMessage extends AbstractTracingProvider {
    private Message message;

    ParsedMessage(Message message) {
        this.message = message;
    }

    String safeGet(String key) {
        if (!message.containsKey(key)) {
            return null;
        }
        Object value = message.get(key);
        return (value instanceof String) ? value.toString() : null;
    }

    URI getUri() {
        return getUri(message);
    }

    Message getEffectiveMessage() {
        boolean isRequestor = MessageUtils.isRequestor(message);
        boolean isOutbound = MessageUtils.isOutbound(message);
        if (isRequestor) {
            return isOutbound ? message : message.getExchange().getOutMessage();
        }
        return isOutbound ? message.getExchange().getInMessage() : message;
    }

    Map> getHeaders() {
        Map> headers = CastUtils.cast((Map) message.get(Message.PROTOCOL_HEADERS));

        if (headers == null) {
            return Collections.emptyMap();
        }

        return headers;
    }

    String getFirstHeader(String key) {
        Map> headers = getHeaders();
        if (headers.containsKey(key)) {
            return headers.get(key).get(0);
        }
        return null;
    }

    void addHeader(String key, String value) {
        Map> headers = CastUtils.cast((Map) message.get(Message.PROTOCOL_HEADERS));
        if (headers == null) {
            headers = new HashMap<>();
            message.put(Message.PROTOCOL_HEADERS, headers);
        }
        headers.put(key, Arrays.asList(value));
    }
}