content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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.apache.causeway.applib.spec;
  
  import org.apache.causeway.applib.annotation.Programmatic;
  import org.apache.causeway.applib.util.ReasonBuffer;
  
  /**
   * Adapter to make it easy to perform boolean algebra on {@link Specification}s.
   *
   * <p>
   * Subclasses represent the intersection of multiple {@link Specification}s. An
   * implementation should instantiate the {@link Specification}s to be satisfied
   * in its constructor.
   *
   * <p>
   * For example:
   *
   * <pre>
   * public class MilkAndSugarSpec extends SpecificationAnd {
   *     public MilkAndSugarSpec() {
   *         super(new MustBeMilkySpec(), new TwoLumpsOfSugarSpec());
   *     }
   * }
   * </pre>
   *
   * @see SpecificationOr
   * @see SpecificationNot
   * @since 1.x {@index}
   */
  public abstract class SpecificationAnd implements Specification {
  
      private final Specification[] specifications;
  
      public SpecificationAnd(final Specification... specifications) {
          this.specifications = specifications;
      }
  
      @Programmatic
      @Override
      public String satisfies(final Object obj) {
          final ReasonBuffer buf = new ReasonBuffer();
          for (final Specification specification : specifications) {
              final String reasonNotSatisfiedIfAny = specification.satisfies(obj);
              buf.append(reasonNotSatisfiedIfAny);
          }
          return buf.getReason(); // may be null if all were satisfied.
      }
  
  }
  