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+/*
+ * 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.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;
+import java.util.Objects;
+
+/**
+ * This filter produces a logical NOT of the filters specified.
+ *
+ * @since 1.0
+ * @see FileFilterUtils#notFileFilter(IOFileFilter)
+ */
+public class NotFileFilter extends AbstractFileFilter implements Serializable {
+
+ private static final long serialVersionUID = 6131563330944994230L;
+
+ /** The filter */
+ private final IOFileFilter filter;
+
+ /**
+ * Constructs a new file filter that NOTs the result of another filter.
+ *
+ * @param filter the filter, must not be null
+ * @throws NullPointerException if the filter is null
+ */
+ public NotFileFilter(final IOFileFilter filter) {
+ Objects.requireNonNull(filter, "filter");
+ this.filter = filter;
+ }
+
+ /**
+ * Returns the logical NOT of the underlying filter's return value for the same File.
+ *
+ * @param file the File to check
+ * @return true if the filter returns false
+ */
+ @Override
+ public boolean accept(final File file) {
+ return !filter.accept(file);
+ }
+
+ /**
+ * Returns the logical NOT of the underlying filter's return value for the same arguments.
+ *
+ * @param file the File directory
+ * @param name the file name
+ * @return true if the filter returns false
+ */
+ @Override
+ public boolean accept(final File file, final String name) {
+ return !filter.accept(file, name);
+ }
+
+ /**
+ * Returns the logical NOT of the underlying filter's return value for the same File.
+ * @param file the File to check
+ *
+ * @return true if the filter returns false
+ * @since 2.9.0
+ */
+ @Override
+ public FileVisitResult accept(final Path file, final BasicFileAttributes attributes) {
+ return not(filter.accept(file, attributes));
+ }
+
+ private FileVisitResult not(final FileVisitResult accept) {
+ return accept == FileVisitResult.CONTINUE ? FileVisitResult.TERMINATE : FileVisitResult.CONTINUE;
+ }
+
+ /**
+ * Provide a String representation of this file filter.
+ *
+ * @return a String representation
+ */
+ @Override
+ public String toString() {
+ return "NOT (" + filter.toString() + ")";
+ }
+
+}