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

package io.opentelemetry.sdk.metrics.internal.view;

import java.util.function.Predicate;
import java.util.regex.Pattern;

/**
 * Re-usable string predicates.
 *
 * This class is internal and is hence not for public use. Its APIs are unstable and can change
 * at any time.
 */
public final class StringPredicates {
  private StringPredicates() {}

  /** A string predicate that matches all strings. */
  public static final Predicate ALL = value -> true;

  /** A string predicate that does exact string matching. */
  public static Predicate exact(String match) {
    return match::equals;
  }

  /** A string predicate that matches against a regular expression. */
  public static Predicate regex(Pattern pattern) {
    return input -> (input != null) && pattern.matcher(input).matches();
  }
}