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 org.apache.logging.log4j.Logger;
  
  /**
   * Searches for all files having a given extension below one or multiple directories.
   */
  public class FileSearch extends AbstractFileSearch {
  
    private static final Logger log = org.apache.logging.log4j.LogManager.getLogger(FileSearch.class);
  
    private String[] suffixes = null;
  
    private long maxSize = -1;
  
    /**
     * <p>Constructor for FileSearch.</p>
     *
     * @param _s an array with accepted file extensions
     * @throws java.lang.IllegalArgumentException if any.
     */
    public FileSearch(String[] _s) throws IllegalArgumentException {
      this(_s, -1);
    }
  
    /**
     * <p>Constructor for FileSearch.</p>
     *
     * @param _s an array with accepted file extensions
     * @param _size maximum accepted file size (no limit, if a value &lt;= 0 is provided)
     * @throws java.lang.IllegalArgumentException if any.
     */
    public FileSearch(String[] _s, long _size) throws IllegalArgumentException {
      if (_s == null || _s.length == 0)
        throw new IllegalArgumentException("At least one file extension must be provided");
      this.suffixes = _s.clone();
      if (_size > 0) this.maxSize = _size;
    }
  
    /**
     * <p>Getter for the field <code>suffixes</code>.</p>
     *
     * @return an array of {@link java.lang.String} objects.
     */
    public String[] getSuffixes() {
      return this.suffixes.clone();
    }
  
    /** {@inheritDoc} */
    @Override
    public FileVisitResult visitFile(Path _f, BasicFileAttributes attrs) {
      if (!this.foundFile(_f) && FileUtil.hasFileExtension(_f, this.suffixes)) {
        if (this.maxSize == -1) {
          this.addFile(_f);
        } else {
          if (_f.toFile().length() < this.maxSize) {
            this.addFile(_f);
          } else {
            log.warn(
                "File ["
                    + _f.toAbsolutePath()
                    + "] ignored because it exceeds the maximum accepted size ["
                    + _f.toFile().length()
                    + " > "
                    + this.maxSize
                    + "] bytes");
          }
        }
      }
      return FileVisitResult.CONTINUE;
    }
  }
  