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Commons IO example source code file (WildcardFileFilter.java)

This example Commons IO source code file (WildcardFileFilter.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, the, the, util, wildcardfilefilter, wildcardfilefilter

The Commons IO WildcardFileFilter.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.FilenameUtils;
import org.apache.commons.io.IOCase;

/**
 * Filters files using the supplied wildcards.
 * <p>
 * This filter selects files and directories based on one or more wildcards.
 * Testing is case-sensitive by default, but this can be configured.
 * <p>
 * The wildcard matcher uses the characters '?' and '*' to represent a
 * single or multiple wildcard characters.
 * This is the same as often found on Dos/Unix command lines.
 * The extension check is case-sensitive by .
 * See {@link FilenameUtils#wildcardMatchOnSystem} for more information.
 * <p>
 * For example:
 * <pre>
 * File dir = new File(".");
 * FileFilter fileFilter = new WildcardFileFilter("*test*.java~*~");
 * File[] files = dir.listFiles(fileFilter);
 * for (int i = 0; i < files.length; i++) {
 *   System.out.println(files[i]);
 * }
 * </pre>
 *
 * @author Jason Anderson
 * @version $Revision: 1004077 $ $Date: 2010-10-04 01:58:42 +0100 (Mon, 04 Oct 2010) $
 * @since Commons IO 1.3
 */
public class WildcardFileFilter extends AbstractFileFilter implements Serializable {

    /** The wildcards that will be used to match filenames. */
    private final String[] wildcards;
    /** Whether the comparison is case sensitive. */
    private final IOCase caseSensitivity;

    /**
     * Construct a new case-sensitive wildcard filter for a single wildcard.
     *
     * @param wildcard  the wildcard to match
     * @throws IllegalArgumentException if the pattern is null
     */
    public WildcardFileFilter(String wildcard) {
        this(wildcard, null);
    }

    /**
     * Construct a new wildcard filter for a single wildcard specifying case-sensitivity.
     *
     * @param wildcard  the wildcard to match, not null
     * @param caseSensitivity  how to handle case sensitivity, null means case-sensitive
     * @throws IllegalArgumentException if the pattern is null
     */
    public WildcardFileFilter(String wildcard, IOCase caseSensitivity) {
        if (wildcard == null) {
            throw new IllegalArgumentException("The wildcard must not be null");
        }
        this.wildcards = new String[] { wildcard };
        this.caseSensitivity = (caseSensitivity == null ? IOCase.SENSITIVE : caseSensitivity);
    }

    /**
     * Construct a new case-sensitive wildcard filter for an array of wildcards.
     * <p>
     * The array is not cloned, so could be changed after constructing the
     * instance. This would be inadvisable however.
     *
     * @param wildcards  the array of wildcards to match
     * @throws IllegalArgumentException if the pattern array is null
     */
    public WildcardFileFilter(String[] wildcards) {
        this(wildcards, null);
    }

    /**
     * Construct a new wildcard filter for an array of wildcards specifying case-sensitivity.
     * <p>
     * The array is not cloned, so could be changed after constructing the
     * instance. This would be inadvisable however.
     *
     * @param wildcards  the array of wildcards to match, not null
     * @param caseSensitivity  how to handle case sensitivity, null means case-sensitive
     * @throws IllegalArgumentException if the pattern array is null
     */
    public WildcardFileFilter(String[] wildcards, IOCase caseSensitivity) {
        if (wildcards == null) {
            throw new IllegalArgumentException("The wildcard array must not be null");
        }
        this.wildcards = new String[wildcards.length];
        System.arraycopy(wildcards, 0, this.wildcards, 0, wildcards.length);
        this.caseSensitivity = (caseSensitivity == null ? IOCase.SENSITIVE : caseSensitivity);
    }

    /**
     * Construct a new case-sensitive wildcard filter for a list of wildcards.
     *
     * @param wildcards  the list of wildcards to match, not null
     * @throws IllegalArgumentException if the pattern list is null
     * @throws ClassCastException if the list does not contain Strings
     */
    public WildcardFileFilter(List<String> wildcards) {
        this(wildcards, null);
    }

    /**
     * Construct a new wildcard filter for a list of wildcards specifying case-sensitivity.
     *
     * @param wildcards  the list of wildcards to match, not null
     * @param caseSensitivity  how to handle case sensitivity, null means case-sensitive
     * @throws IllegalArgumentException if the pattern list is null
     * @throws ClassCastException if the list does not contain Strings
     */
    public WildcardFileFilter(List<String> wildcards, IOCase caseSensitivity) {
        if (wildcards == null) {
            throw new IllegalArgumentException("The wildcard list must not be null");
        }
        this.wildcards = wildcards.toArray(new String[wildcards.size()]);
        this.caseSensitivity = (caseSensitivity == null ? IOCase.SENSITIVE : caseSensitivity);
    }

    //-----------------------------------------------------------------------
    /**
     * Checks to see if the filename matches one of the wildcards.
     *
     * @param dir  the file directory
     * @param name  the filename
     * @return true if the filename matches one of the wildcards
     */
    @Override
    public boolean accept(File dir, String name) {
        for (String wildcard : wildcards) {
            if (FilenameUtils.wildcardMatch(name, wildcard, caseSensitivity)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Checks to see if the filename matches one of the wildcards.
     *
     * @param file  the file to check
     * @return true if the filename matches one of the wildcards
     */
    @Override
    public boolean accept(File file) {
        String name = file.getName();
        for (String wildcard : wildcards) {
            if (FilenameUtils.wildcardMatch(name, wildcard, caseSensitivity)) {
                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 (wildcards != null) {
            for (int i = 0; i < wildcards.length; i++) {
                if (i > 0) {
                    buffer.append(",");
                }
                buffer.append(wildcards[i]);
            }
        }
        buffer.append(")");
        return buffer.toString();
    }

}

Other Commons IO examples (source code examples)

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