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A collection of various utility classes to ease working with strings, files, command lines, XML and more.
There is a newer version: 4.0.1
package org.codehaus.plexus.util;

/*
 * Copyright The Codehaus Foundation.
 *
 * Licensed 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.
 */

import java.io.File;
import java.util.Comparator;

/**
 * Scan a directory tree for files, with specified inclusions and exclusions.
 */
public interface Scanner
{

    /**
     * Sets the list of include patterns to use. All '/' and '\' characters are replaced by
     * File.separatorChar, so the separator used need not match File.separatorChar.
     * 
     * When a pattern ends with a '/' or '\', "**" is appended.
     *
     * @param includes A list of include patterns. May be null, indicating that all files should be
     *            included. If a non-null list is given, all elements must be non-null.
     */
    void setIncludes( String[] includes );

    /**
     * Sets the list of exclude patterns to use. All '/' and '\' characters are replaced by
     * File.separatorChar, so the separator used need not match File.separatorChar.
     * 
     * When a pattern ends with a '/' or '\', "**" is appended.
     *
     * @param excludes A list of exclude patterns. May be null, indicating that no files should be
     *            excluded. If a non-null list is given, all elements must be non-null.
     */
    void setExcludes( String[] excludes );

    /**
     * Adds default exclusions to the current exclusions set.
     */
    void addDefaultExcludes();

    /**
     * Scans the base directory for files which match at least one include pattern and don't match any exclude patterns.
     *
     * @exception IllegalStateException if the base directory was set incorrectly (i.e. if it is null,
     *                doesn't exist, or isn't a directory).
     */
    void scan();

    /**
     * Returns the names of the files which matched at least one of the include patterns and none of the exclude
     * patterns. The names are relative to the base directory.
     *
     * @return the names of the files which matched at least one of the include patterns and none of the exclude
     *         patterns.
     */
    String[] getIncludedFiles();

    /**
     * Returns the names of the directories which matched at least one of the include patterns and none of the exclude
     * patterns. The names are relative to the base directory.
     *
     * @return the names of the directories which matched at least one of the include patterns and none of the exclude
     *         patterns.
     */
    String[] getIncludedDirectories();

    /**
     * Returns the base directory to be scanned. This is the directory which is scanned recursively.
     *
     * @return the base directory to be scanned
     */
    File getBasedir();

    /**
     * Use a filename comparator in each directory when scanning.
     *
     * @param filenameComparator
     * @since 3.3.0
     */
    void setFilenameComparator( Comparator filenameComparator );
}