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Diffstat (limited to 'src/main/java/org/apache/commons/io/filefilter/NotFileFilter.java')
-rw-r--r-- | src/main/java/org/apache/commons/io/filefilter/NotFileFilter.java | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/io/filefilter/NotFileFilter.java b/src/main/java/org/apache/commons/io/filefilter/NotFileFilter.java new file mode 100644 index 00000000..1cc5d4f9 --- /dev/null +++ b/src/main/java/org/apache/commons/io/filefilter/NotFileFilter.java @@ -0,0 +1,99 @@ +/* + * 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() + ")"; + } + +} |