content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.tooling.bytebuddy;
  
  import io.opentelemetry.javaagent.extension.matcher.internal.DelegatingMatcher;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  import javax.annotation.Nullable;
  import net.bytebuddy.matcher.ElementMatcher;
  
  /**
   * A fail-safe matcher catches exceptions that are thrown by a delegate matcher and returns {@code
   * false}.
   *
   * <p>Logs exception if it was thrown.
   *
   * @param <T> The type of the matched entity.
   * @see net.bytebuddy.matcher.FailSafeMatcher
   */
  public class LoggingFailSafeMatcher<T> extends ElementMatcher.Junction.AbstractBase<T>
      implements DelegatingMatcher {
  
    private static final Logger logger = Logger.getLogger(LoggingFailSafeMatcher.class.getName());
  
    /** The delegate matcher that might throw an exception. */
    private final ElementMatcher<? super T> matcher;
  
    /** The text description to log if exception happens. */
    private final String description;
  
    /**
     * Creates a new fail-safe element matcher.
     *
     * @param matcher The delegate matcher that might throw an exception.
     * @param description Descriptive string to log along with exception.
     */
    public LoggingFailSafeMatcher(ElementMatcher<? super T> matcher, String description) {
      this.matcher = matcher;
      this.description = description;
    }
  
    @Override
    public boolean matches(T target) {
      try {
        return matcher.matches(target);
      } catch (Throwable e) {
        logger.log(Level.FINE, description, e);
        return false;
      }
    }
  
    @Override
    public String toString() {
      return "failSafe(try(" + matcher + ") or false)";
    }
  
    @Override
    public boolean equals(@Nullable Object obj) {
      if (obj == this) {
        return true;
      }
      if (!(obj instanceof LoggingFailSafeMatcher)) {
        return false;
      }
      LoggingFailSafeMatcher<?> other = (LoggingFailSafeMatcher<?>) obj;
      return matcher.equals(other.matcher);
    }
  
    @Override
    public int hashCode() {
      return matcher.hashCode();
    }
  
    @Override
    public ElementMatcher<?> getDelegate() {
      return matcher;
    }
  }
  