com.github.methylene.args.predicate.ListPredicates Maven / Gradle / Ivy

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package com.github.methylene.args.predicate;

import com.github.methylene.args.Predicate;
import com.github.methylene.args.Token;

import java.util.Collections;
import java.util.List;
import java.util.regex.Pattern;

public class ListPredicates {

  public static Predicate> matches(final Predicate predicate) {
    return new Predicate>() {
      @Override
      public boolean matches(List tokens) {
        if (tokens == null)
          tokens = Collections.emptyList();
        for (Token token: tokens)
          if (!predicate.matches(token))
            return false;
        return true;
      }
    };
  }

  public static Predicate> matches(final Pattern pattern) {
    return matches(TokenPredicates.matches(StringPredicates.matches(pattern)));
  }

  public static Predicate> hasCardinality(final Predicate cardinality) {
    return new Predicate>() {
      @Override
      public boolean matches(List arg) {
        if (arg == null)
          arg = Collections.emptyList();
        return cardinality.matches(arg.size());
      }
    };
  }

  public static Predicate> isSingleValue() {
    return Predicates.and(isValue(), hasCardinality(IntegerPredicates.exactly(1)));
  }

  public static Predicate> isSingleFlag() {
    return Predicates.and(isFlag(), hasCardinality(IntegerPredicates.exactly(1)));
  }

  public static Predicate> isPresent() {
    return hasCardinality(IntegerPredicates.geq(1));
  }

  public static Predicate> isValue() {
    return matches(TokenPredicates.isValue());
  }

  public static Predicate> isFlag() {
    return matches(TokenPredicates.isFlag());
  }

}