/*
 * 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.tsfile.external.commons.io.filefilter;

import java.io.File;
import java.io.Serializable;
import java.nio.file.FileVisitResult;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;

/**
 * A file filter that always returns true.
 *
 * <h2>Deprecating Serialization</h2>
 *
 * <p><em>Serialization is deprecated and will be removed in 3.0.</em>
 *
 * @since 1.0
 * @see FileFilterUtils#trueFileFilter()
 */
public class TrueFileFilter implements IOFileFilter, Serializable {

  private static final String TO_STRING = Boolean.TRUE.toString();

  private static final long serialVersionUID = 8782512160909720199L;

  /**
   * Singleton instance of true filter.
   *
   * @since 1.3
   */
  public static final IOFileFilter TRUE = new TrueFileFilter();

  /**
   * Singleton instance of true filter. Please use the identical TrueFileFilter.TRUE constant. The
   * new name is more JDK 1.5 friendly as it doesn't clash with other values when using static
   * imports.
   */
  public static final IOFileFilter INSTANCE = TRUE;

  /** Restrictive constructor. */
  protected TrueFileFilter() {}

  /**
   * Returns true.
   *
   * @param file the file to check (ignored)
   * @return true
   */
  @Override
  public boolean accept(final File file) {
    return true;
  }

  /**
   * Returns true.
   *
   * @param dir the directory to check (ignored)
   * @param name the file name (ignored)
   * @return true
   */
  @Override
  public boolean accept(final File dir, final String name) {
    return true;
  }

  /**
   * Returns true.
   *
   * @param file the file to check (ignored)
   * @return true
   * @since 2.9.0
   */
  @Override
  public FileVisitResult accept(final Path file, final BasicFileAttributes attributes) {
    return FileVisitResult.CONTINUE;
  }

  @Override
  public IOFileFilter and(final IOFileFilter fileFilter) {
    // TRUE AND expression <=> expression
    return fileFilter;
  }

  @Override
  public IOFileFilter or(final IOFileFilter fileFilter) {
    // TRUE OR expression <=> true
    return INSTANCE;
  }

  @Override
  public String toString() {
    return TO_STRING;
  }
}
