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.nio.file.FileVisitResult;
  import java.nio.file.Path;
  import java.nio.file.attribute.BasicFileAttributes;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import javax.validation.constraints.NotNull;
  
  /**
   * Searches for all files whose name matches a given pattern.
   */
  public class FilenamePatternSearch extends AbstractFileSearch {
  
    private Pattern pattern = null;
  
    /**
     * <p>Constructor for FilenamePatternSearch.</p>
     *
     * @param _regex a {@link java.lang.String} object.
     */
    public FilenamePatternSearch(@NotNull String _regex) {
      this(Pattern.compile(_regex));
    }
  
    /**
     * <p>Constructor for FilenamePatternSearch.</p>
     *
     * @param _pattern a {@link java.util.regex.Pattern} object.
     */
    public FilenamePatternSearch(@NotNull Pattern _pattern) {
      this.pattern = _pattern;
    }
  
    /** {@inheritDoc} */
    @Override
    public FileVisitResult visitFile(Path _f, BasicFileAttributes attrs) {
      if (!_f.toFile().isDirectory() && !this.foundFile(_f) && _f.getFileName() != null) {
        final Matcher m = this.pattern.matcher(_f.getFileName().toString());
        if (m.matches()) {
          this.addFile(_f);
        }
      }
      return FileVisitResult.CONTINUE;
    }
  }
  