/*
    * 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.syncope.core.logic.scim;
  
  import org.antlr.v4.runtime.CharStreams;
  import org.antlr.v4.runtime.CommonTokenStream;
  import org.apache.syncope.core.persistence.api.dao.search.SearchCond;
  import org.apache.syncope.ext.scimv2.api.BadRequestException;
  import org.apache.syncope.ext.scimv2.api.type.ErrorType;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Converts SCIM filter expressions to Syncope's {@link SearchCond}.
   */
  public final class SearchCondConverter {
  
      private static final Logger LOG = LoggerFactory.getLogger(SearchCondConverter.class);
  
      public static SearchCond convert(final SearchCondVisitor visitor, final String filter) {
          SCIMFilterParser parser = new SCIMFilterParser(
                  new CommonTokenStream(new SCIMFilterLexer(CharStreams.fromString(filter))));
          parser.setBuildParseTree(true);
          parser.setTrimParseTree(true);
          parser.setProfile(true);
          parser.removeErrorListeners();
          parser.setErrorHandler(new SCIMFilterErrorHandler());
  
          try {
              return visitor.visit(parser.scimFilter());
          } catch (Exception e) {
              LOG.error("Could not parse '{}'", filter, e);
              throw new BadRequestException(ErrorType.invalidFilter, "Could not parse '" + filter + '\'');
          }
      }
  
      private SearchCondConverter() {
          // empty constructor for static utility class        
      }
  }