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Commons IO example source code file (NotFileFilter.java)

This example Commons IO source code file (NotFileFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons IO tags/keywords

abstractfilefilter, illegalargumentexception, io, iofilefilter, notfilefilter, notfilefilter, override, override, serializable, string, string, the, the

The Commons IO NotFileFilter.java source code

/*
 * 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;

/**
 * This filter produces a logical NOT of the filters specified.
 *
 * @since Commons IO 1.0
 * @version $Revision: 1005099 $ $Date: 2010-10-06 17:13:01 +0100 (Wed, 06 Oct 2010) $
 * 
 * @author Stephen Colebourne
 * @see FileFilterUtils#notFileFilter(IOFileFilter)
 */
public class NotFileFilter extends AbstractFileFilter implements Serializable {
    
    /** 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 IllegalArgumentException if the filter is null
     */
    public NotFileFilter(IOFileFilter filter) {
        if (filter == null) {
            throw new IllegalArgumentException("The filter must not be null");
        }
        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(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 filename
     * @return true if the filter returns false
     */
    @Override
    public boolean accept(File file, String name) {
        return ! filter.accept(file, name);
    }

    /**
     * Provide a String representaion of this file filter.
     *
     * @return a String representaion
     */
    @Override
    public String toString() {
        return super.toString() + "(" + filter.toString()  + ")";
    }
    
}

Other Commons IO examples (source code examples)

Here is a short list of links related to this Commons IO NotFileFilter.java source code file:



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