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Commons IO example source code file (SuffixFileFilter.java)

This example Commons IO source code file (SuffixFileFilter.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, iocase, iocase, override, serializable, string, string, stringbuilder, suffixfilefilter, suffixfilefilter, the, the, util

The Commons IO SuffixFileFilter.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;
import java.util.List;

import org.apache.commons.io.IOCase;

/**
 * Filters files based on the suffix (what the filename ends with).
 * This is used in retrieving all the files of a particular type.
 * <p>
 * For example, to retrieve and print all <code>*.java files 
 * in the current directory:
 *
 * <pre>
 * File dir = new File(".");
 * String[] files = dir.list( new SuffixFileFilter(".java") );
 * for (int i = 0; i < files.length; i++) {
 *     System.out.println(files[i]);
 * }
 * </pre>
 *
 * @since Commons IO 1.0
 * @version $Revision: 1005099 $ $Date: 2010-10-06 17:13:01 +0100 (Wed, 06 Oct 2010) $
 * 
 * @author Stephen Colebourne
 * @author Federico Barbieri
 * @author Serge Knystautas
 * @author Peter Donald
 * @see FileFilterUtils#suffixFileFilter(String)
 * @see FileFilterUtils#suffixFileFilter(String, IOCase)
 */
public class SuffixFileFilter extends AbstractFileFilter implements Serializable {
    
    /** The filename suffixes to search for */
    private final String[] suffixes;

    /** Whether the comparison is case sensitive. */
    private final IOCase caseSensitivity;

    /**
     * Constructs a new Suffix file filter for a single extension.
     * 
     * @param suffix  the suffix to allow, must not be null
     * @throws IllegalArgumentException if the suffix is null
     */
    public SuffixFileFilter(String suffix) {
        this(suffix, IOCase.SENSITIVE);
    }

    /**
     * Constructs a new Suffix file filter for a single extension
     * specifying case-sensitivity.
     *
     * @param suffix  the suffix to allow, must not be null
     * @param caseSensitivity  how to handle case sensitivity, null means case-sensitive
     * @throws IllegalArgumentException if the suffix is null
     * @since Commons IO 1.4
     */
    public SuffixFileFilter(String suffix, IOCase caseSensitivity) {
        if (suffix == null) {
            throw new IllegalArgumentException("The suffix must not be null");
        }
        this.suffixes = new String[] {suffix};
        this.caseSensitivity = (caseSensitivity == null ? IOCase.SENSITIVE : caseSensitivity);
    }

    /**
     * Constructs a new Suffix file filter for an array of suffixs.
     * <p>
     * The array is not cloned, so could be changed after constructing the
     * instance. This would be inadvisable however.
     * 
     * @param suffixes  the suffixes to allow, must not be null
     * @throws IllegalArgumentException if the suffix array is null
     */
    public SuffixFileFilter(String[] suffixes) {
        this(suffixes, IOCase.SENSITIVE);
    }

    /**
     * Constructs a new Suffix file filter for an array of suffixs
     * specifying case-sensitivity.
     * <p>
     * The array is not cloned, so could be changed after constructing the
     * instance. This would be inadvisable however.
     * 
     * @param suffixes  the suffixes to allow, must not be null
     * @param caseSensitivity  how to handle case sensitivity, null means case-sensitive
     * @throws IllegalArgumentException if the suffix array is null
     * @since Commons IO 1.4
     */
    public SuffixFileFilter(String[] suffixes, IOCase caseSensitivity) {
        if (suffixes == null) {
            throw new IllegalArgumentException("The array of suffixes must not be null");
        }
        this.suffixes = new String[suffixes.length];
        System.arraycopy(suffixes, 0, this.suffixes, 0, suffixes.length);
        this.caseSensitivity = (caseSensitivity == null ? IOCase.SENSITIVE : caseSensitivity);
    }

    /**
     * Constructs a new Suffix file filter for a list of suffixes.
     * 
     * @param suffixes  the suffixes to allow, must not be null
     * @throws IllegalArgumentException if the suffix list is null
     * @throws ClassCastException if the list does not contain Strings
     */
    public SuffixFileFilter(List<String> suffixes) {
        this(suffixes, IOCase.SENSITIVE);
    }

    /**
     * Constructs a new Suffix file filter for a list of suffixes
     * specifying case-sensitivity.
     * 
     * @param suffixes  the suffixes to allow, must not be null
     * @param caseSensitivity  how to handle case sensitivity, null means case-sensitive
     * @throws IllegalArgumentException if the suffix list is null
     * @throws ClassCastException if the list does not contain Strings
     * @since Commons IO 1.4
     */
    public SuffixFileFilter(List<String> suffixes, IOCase caseSensitivity) {
        if (suffixes == null) {
            throw new IllegalArgumentException("The list of suffixes must not be null");
        }
        this.suffixes = suffixes.toArray(new String[suffixes.size()]);
        this.caseSensitivity = (caseSensitivity == null ? IOCase.SENSITIVE : caseSensitivity);
    }

    /**
     * Checks to see if the filename ends with the suffix.
     * 
     * @param file  the File to check
     * @return true if the filename ends with one of our suffixes
     */
    @Override
    public boolean accept(File file) {
        String name = file.getName();
        for (String suffix : this.suffixes) {
            if (caseSensitivity.checkEndsWith(name, suffix)) {
                return true;
            }
        }
        return false;
    }
    
    /**
     * Checks to see if the filename ends with the suffix.
     * 
     * @param file  the File directory
     * @param name  the filename
     * @return true if the filename ends with one of our suffixes
     */
    @Override
    public boolean accept(File file, String name) {
        for (String suffix : this.suffixes) {
            if (caseSensitivity.checkEndsWith(name, suffix)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Provide a String representaion of this file filter.
     *
     * @return a String representaion
     */
    @Override
    public String toString() {
        StringBuilder buffer = new StringBuilder();
        buffer.append(super.toString());
        buffer.append("(");
        if (suffixes != null) {
            for (int i = 0; i < suffixes.length; i++) {
                if (i > 0) {
                    buffer.append(",");
                }
                buffer.append(suffixes[i]);
            }
        }
        buffer.append(")");
        return buffer.toString();
    }
    
}

Other Commons IO examples (source code examples)

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