org.immutables.criteria.matcher.BooleanMatcher Maven / Gradle / Ivy

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/*
 * Copyright 2019 Immutables Authors and Contributors
 *
 * Licensed 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 org.immutables.criteria.matcher;


import org.immutables.criteria.expression.Expressions;
import org.immutables.criteria.expression.Operators;

/**
 * Very simple matcher for booleans just has {@code true} / {@code false} checks.
 *
 * @param  root criteria type
 */
public interface BooleanMatcher extends Matcher {

  default R isTrue() {
    return Matchers.extract(this).applyAndCreateRoot(e -> Expressions.call(Operators.EQUAL, e, Expressions.constant(Boolean.TRUE)));
  }

  default R isFalse() {
    return Matchers.extract(this).applyAndCreateRoot(e -> Expressions.call(Operators.EQUAL, e, Expressions.constant(Boolean.FALSE)));
  }

  default R is(boolean value) {
    return value ? isTrue() : isFalse();
  }

  /**
   * Self-type for this matcher
   */
  interface Self extends Template {}

  interface Template extends BooleanMatcher, WithMatcher, NotMatcher, Projection, Aggregation.Count {}

  @SuppressWarnings("unchecked")
  static  CriteriaCreator creator() {
    class Local extends AbstractContextHolder implements Self {
      private Local(CriteriaContext context) {
        super(context);
      }
    }

    return ctx -> (R) new Local(ctx);
  }

}