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/**
* Copyright 2022 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 io.micrometer.tracing.internal;
import io.micrometer.common.util.StringUtils;
/**
* Utility class that provides the name in hyphen based notation.
*
* @author Adrian Cole
* @since 1.0.0
*/
public final class SpanNameUtil {
static final int MAX_NAME_LENGTH = 50;
private SpanNameUtil() {
}
/**
* Shortens the name of a span.
* @param name name to shorten
* @return shortened name
*/
public static String shorten(String name) {
if (!StringUtils.isNotBlank(name)) {
return name;
}
int maxLength = Math.min(name.length(), MAX_NAME_LENGTH);
return name.substring(0, maxLength);
}
/**
* Converts the name to a lower hyphen version.
* @param name name to change
* @return changed name
*/
public static String toLowerHyphen(String name) {
StringBuilder result = new StringBuilder();
for (int i = 0; i < name.length(); i++) {
char c = name.charAt(i);
if (Character.isUpperCase(c)) {
if (i != 0) {
result.append('-');
}
result.append(Character.toLowerCase(c));
}
else {
result.append(c);
}
}
return SpanNameUtil.shorten(result.toString());
}
}