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.core.metamodel.facets.objectvalue.maxlen;
  
  import org.apache.causeway.core.metamodel.facetapi.Facet;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  import org.apache.causeway.core.metamodel.facets.SingleIntValueFacetAbstract;
  import org.apache.causeway.core.metamodel.interactions.ProposedHolder;
  import org.apache.causeway.core.metamodel.interactions.val.ValidityContext;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.object.MmUnwrapUtils;
  
  public abstract class MaxLengthFacetAbstract
  extends SingleIntValueFacetAbstract
  implements MaxLengthFacet {
  
      private static final Class<? extends Facet> type() {
          return MaxLengthFacet.class;
      }
  
      protected MaxLengthFacetAbstract(
              final int maxLength,
              final FacetHolder holder) {
          super(type(), holder, maxLength);
      }
  
      protected MaxLengthFacetAbstract(
              final int maxLength,
              final FacetHolder holder,
              final Facet.Precedence precedence) {
          super(type(), holder, maxLength, precedence);
      }
  
      /**
       * Whether the provided argument exceeds the {@link #value() maximum length}
       * .
       */
      @Override
      public boolean exceeds(final ManagedObject adapter) {
          final String str = MmUnwrapUtils.singleAsStringOrElse(adapter, null);
          if (str == null) return false;
  
          final int maxLength = value();
          return maxLength != 0 && str.length() > maxLength;
      }
  
      @Override
      public String invalidates(final ValidityContext context) {
          if (!(context instanceof ProposedHolder)) return null;
  
          var proposedHolder = (ProposedHolder) context;
          var proposedArgument = proposedHolder.proposed();
          if (!exceeds(proposedArgument)) return null;
  
          return "The value proposed exceeds the maximum length of " + value();
      }
  
      @Override
      protected String getAttributeNameForValue() {
          return "maxLength";
      }
  
      @Override
      protected String getAttributeValueForValue(final int value) {
          return value == 0 ? "unlimited" : String.valueOf(value);
      }
  }
  