org.apache.camel.tracing.propagation.CamelMessagingHeadersExtractAdapter Maven / Gradle / Ivy

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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.camel.tracing.propagation;

import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.apache.camel.tracing.ExtractAdapter;

public final class CamelMessagingHeadersExtractAdapter implements ExtractAdapter {

    private final Map map = new HashMap<>();
    private final boolean jmsEncoding;

    public CamelMessagingHeadersExtractAdapter(final Map map, boolean jmsEncoding) {
        // Extract string valued map entries
        this.jmsEncoding = jmsEncoding;
        map.entrySet().stream().filter(e -> e.getValue() instanceof String || e.getValue() instanceof byte[]).forEach(e -> {
            if (e.getValue() instanceof byte[]) {
                this.map.put(decodeDash(e.getKey()), new String((byte[]) e.getValue(), StandardCharsets.UTF_8));
            } else {
                this.map.put(decodeDash(e.getKey()), (String) e.getValue());
            }
        });
    }

    @Override
    public Iterator> iterator() {
        return map.entrySet().iterator();
    }

    @Override
    public Object get(String key) {
        return this.map.get(key);
    }

    @Override
    public Set keys() {
        return map.keySet();
    }

    /**
     * Decode dashes (encoded in {@link CamelMessagingHeadersInjectAdapter} Dash encoding and decoding is required by
     * JMS. This is implemented here rather than specifically to JMS so that other Camel messaging endpoints can take
     * part in traces where the peer is using JMS.
     */
    private String decodeDash(String key) {
        if (jmsEncoding) {
            return key.replace(CamelMessagingHeadersInjectAdapter.JMS_DASH, "-");
        } else {
            return key;
        }
    }
}