forked from infracloudio/cassandra-jaeger-tracing
/
StandardTextMap.java
93 lines (82 loc) · 3.11 KB
/
StandardTextMap.java
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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 io.infracloud.cassandra.tracing;
import io.opentracing.propagation.TextMap;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
public class StandardTextMap implements TextMap {
public static final StandardTextMap EMPTY_MAP = new StandardTextMap();
private static final Charset charset = StandardCharsets.UTF_8;
private final Map<String, String> map = new HashMap<>();
protected StandardTextMap() {
}
protected StandardTextMap(Map<String, ByteBuffer> custom_payload) {
for (Map.Entry<String, ByteBuffer> entry : custom_payload.entrySet()) {
String key = entry.getKey();
String value = charset.decode(entry.getValue()).toString();
put(key, value);
}
}
/**
* An alternative constructor. Due to type erasure compatibility I cannot make
* an overloaded constructor in Java
*/
static public StandardTextMap from_bytes(Map<String, byte[]> custom_payload) {
final Map<String, ByteBuffer> my_map = new HashMap<>();
for (Map.Entry<String, byte[]> entry : custom_payload.entrySet()) {
my_map.put(entry.getKey(), ByteBuffer.wrap(entry.getValue()));
}
return new StandardTextMap(my_map);
}
public void injectToByteMap(Map<String, byte[]> my_map) {
for (Map.Entry<String, String> entry : map.entrySet()) {
my_map.put(entry.getKey(), entry.getValue().getBytes(charset));
}
}
@Override
public Iterator<Map.Entry<String, String>> iterator() {
return map.entrySet().iterator();
}
/**
* This is for debug use only
*
* @return string representation of contents of the text map
*/
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append("StandardTextMap<");
for (Map.Entry<String, String> entry : map.entrySet()) {
sb.append(entry.getKey());
sb.append("=");
sb.append(entry.getValue());
sb.append(",");
}
sb.deleteCharAt(sb.length() - 1);
sb.append(">");
return sb.toString();
}
@Override
public void put(String s, String s1) {
map.put(s, s1);
}
}