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Instrumentation of Java libraries using OpenTelemetry.

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/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package io.opentelemetry.javaagent.tooling;

import java.util.Map;
import java.util.TreeMap;
import org.objectweb.asm.commons.Remapper;

public class ShadingRemapper extends Remapper {
  public static class Rule {
    private final String from;
    private final String to;

    public Rule(String from, String to) {
      // Strip prefix added to prevent the build-time relocation from changing the names
      if (from.startsWith("#")) {
        from = from.substring(1);
      }
      if (to.startsWith("#")) {
        to = to.substring(1);
      }
      this.from = from.replace('.', '/');
      this.to = to.replace('.', '/');
    }
  }

  public static Rule rule(String from, String to) {
    return new Rule(from, to);
  }

  private final TreeMap map = new TreeMap<>();

  public ShadingRemapper(Rule... rules) {
    for (Rule rule : rules) {
      map.put(rule.from, rule.to);
    }
  }

  @Override
  public String map(String internalName) {
    Map.Entry e = map.floorEntry(internalName);
    if (e != null && internalName.startsWith(e.getKey())) {
      return e.getValue() + internalName.substring(e.getKey().length());
    }
    return super.map(internalName);
  }
}