co.elastic.otel.profiler.StackFrame Maven / Gradle / Ivy

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/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. 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 co.elastic.otel.profiler;

import java.util.Objects;
import javax.annotation.Nullable;

public class StackFrame {
  @Nullable private final String className;
  private final String methodName;

  public static StackFrame of(@Nullable String className, String methodName) {
    return new StackFrame(className, methodName);
  }

  public StackFrame(@Nullable String className, String methodName) {
    this.className = className;
    this.methodName = methodName;
  }

  @Nullable
  public String getClassName() {
    return className;
  }

  public String getMethodName() {
    return methodName;
  }

  public int getSimpleClassNameOffset() {
    if (className != null) {
      return className.lastIndexOf('.') + 1;
    }
    return 0;
  }

  public void appendFileName(StringBuilder replaceBuilder) {
    final String unknownCodeSource = "";
    if (className != null) {
      int fileNameEnd = className.indexOf('$');
      if (fileNameEnd < 0) {
        fileNameEnd = className.length();
      }
      int classNameStart = className.lastIndexOf('.');
      if (classNameStart < fileNameEnd && fileNameEnd <= className.length()) {
        replaceBuilder.append(className, classNameStart + 1, fileNameEnd);
        replaceBuilder.append(".java");
      } else {
        replaceBuilder.append(unknownCodeSource);
      }
    } else {
      replaceBuilder.append(unknownCodeSource);
    }
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    StackFrame that = (StackFrame) o;

    if (!Objects.equals(className, that.className)) {
      return false;
    }
    return methodName.equals(that.methodName);
  }

  @Override
  public int hashCode() {
    int result = className != null ? className.hashCode() : 0;
    result = 31 * result + methodName.hashCode();
    return result;
  }

  @Override
  public String toString() {
    if (className == null) {
      return methodName;
    }
    return className + '.' + methodName;
  }
}