code: /**
   * This file is part of Eclipse Steady.
   *
   * 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.
   *
   * SPDX-License-Identifier: Apache-2.0
   * SPDX-FileCopyrightText: Copyright (c) 2018-2020 SAP SE or an SAP affiliate company and Eclipse Steady contributors
   */
  package org.eclipse.steady.shared.util;
  
  import java.util.HashSet;
  import java.util.Set;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.apache.logging.log4j.Logger;
  import org.eclipse.steady.shared.json.model.ConstructId;
  
  /**
   * <p>ConstructIdUtil class.</p>
   */
  public class ConstructIdUtil {
  
    private static final Logger log =
        org.apache.logging.log4j.LogManager.getLogger(ConstructIdUtil.class);
  
    /**
     * <p>filterWithRegex.</p>
     *
     * @param _in a {@link java.util.Set} object.
     * @param _qname_filter an array of {@link java.lang.String} objects.
     * @return a {@link java.util.Set} object.
     */
    public static Set<ConstructId> filterWithRegex(Set<ConstructId> _in, String[] _qname_filter) {
      final Set<ConstructId> result = new HashSet<ConstructId>();
      final Set<Pattern> filter = new HashSet<Pattern>();
      Matcher m = null;
      for (String f : _qname_filter) filter.add(Pattern.compile(f));
      final int count_before = _in.size();
      for (ConstructId c : _in) {
        for (Pattern p : filter) {
          m = p.matcher(c.getQname());
          if (m.matches()) result.add(c);
        }
      }
      final int count_after = result.size();
      log.info("[" + (count_before - count_after) + "/" + count_before + "] items filtered");
      return result;
    }
  }
  