/*
    * Copyright 2009 the original author or authors.
    * 
    * 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.openehealth.ipf.commons.ihe.xds.core.validate.query;
  
  import static org.apache.commons.lang3.Validate.notNull;
  import org.openehealth.ipf.commons.ihe.xds.core.ebxml.EbXMLAdhocQueryRequest;
  import org.openehealth.ipf.commons.ihe.xds.core.transform.requests.QueryParameter;
  import org.openehealth.ipf.commons.ihe.xds.core.transform.requests.query.QuerySlotHelper;
  import static org.openehealth.ipf.commons.ihe.xds.core.validate.ValidationMessage.*;
  import static org.openehealth.ipf.commons.ihe.xds.core.validate.ValidatorAssertions.metaDataAssert;
  import org.openehealth.ipf.commons.ihe.xds.core.validate.ValueValidator;
  import org.openehealth.ipf.commons.ihe.xds.core.validate.XDSMetaDataException;
  
  import java.util.List;
  import java.util.regex.Pattern;
  
  /**
   * Query parameter validation for parameters that are StringList-based. 
   * @author Jens Riemschneider
   */
  public class StringListValidation implements QueryParameterValidation {
      private static final Pattern PATTERN =
              Pattern.compile("\\(\\s*'.*'(\\s*,\\s*'.*')*\\s*\\)");
  
      private final QueryParameter param;
      private final ValueValidator validator;
  
      /**
       * Constructs a validation object.
       * @param param
       *          parameter to validate.
       * @param validator
       *          validator used on each of the string in the string list. 
       */
      public StringListValidation(QueryParameter param, ValueValidator validator) {
          notNull(param, "param cannot be null");
          notNull(validator, "validator cannot be null");
          this.param = param;
          this.validator = validator;
      }
  
      @Override
      public void validate(EbXMLAdhocQueryRequest request) throws XDSMetaDataException {
          List<String> slotValues = request.getSlotValues(param.getSlotName());
          for (String slotValue : slotValues) {
              metaDataAssert(slotValue != null, MISSING_REQUIRED_QUERY_PARAMETER, param);
              metaDataAssert(PATTERN.matcher(slotValue).matches(),
                      PARAMETER_VALUE_NOT_STRING_LIST, param);
          }
  
          QuerySlotHelper slots = new QuerySlotHelper(request);
          List<String> list = slots.toStringList(param);
          
          if (list != null) {
              for (String value : list) {
                  metaDataAssert(value != null, INVALID_QUERY_PARAMETER_VALUE, param);
                  validator.validate(value);
              }
          }
      }
  }