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package com.fitbur.failsafe;

import java.util.List;

import com.fitbur.failsafe.function.BiPredicate;
import com.fitbur.failsafe.function.Predicate;

/**
 * Utility for creating predicates.
 * 
 * @author Jonathan Halterman
 */
final class Predicates {
  /**
   * Returns a predicate that evaluates whether the {@code result} equals an execution result.
   */
  static BiPredicate resultPredicateFor(final Object result) {
    return new BiPredicate() {
      @Override
      public boolean test(Object t, Throwable u) {
        return result == null ? t == null : result.equals(t);
      }
    };
  }

  /**
   * Returns a predicate that evaluates the {@code failurePredicate} against a failure.
   */
  @SuppressWarnings("unchecked")
  static BiPredicate failurePredicateFor(final Predicate failurePredicate) {
    return new BiPredicate() {
      @Override
      public boolean test(Object t, Throwable u) {
        return u != null && ((Predicate) failurePredicate).test(u);
      }
    };
  }

  /**
   * Returns a predicate that evaluates the {@code resultPredicate} against a result.
   */
  @SuppressWarnings("unchecked")
  static  BiPredicate resultPredicateFor(final Predicate resultPredicate) {
    return new BiPredicate() {
      @Override
      public boolean test(Object t, Throwable u) {
        return ((Predicate