filter.java

java实现正则表达式的代码

/*
 * $Id: filter.java,v 1.8 2003/11/07 20:16:23 dfs Exp $
 *
 * ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation", "Jakarta-Oro" 
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact [e-mail].
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 * 5. Products derived from this software may not be called "Apache" 
 *    or "Jakarta-Oro", nor may "Apache" or "Jakarta-Oro" appear in their 
 *    name, without prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */


package examples;

import java.io.*;
import java.util.*;

import org.apache.oro.io.*;
import org.apache.oro.text.*;

/**
 * This is a sample program demonstrating how to use the regular expression
 * filename filter classes.
 *
 * @version @version@
 */
public final class filter {

  public static void printList(String[] list) {
    System.out.println();
    for(int i=0; i < list.length; i++)
      System.out.println(list[i]);
    System.out.println();
  }

  public static final void main(String[] args) {
    File dir;
    FilenameFilter filter;

    dir = new File(System.getProperty("user.dir"));

    // List all files ending in .java
    filter = new GlobFilenameFilter("*.java",
			    GlobCompiler.STAR_CANNOT_MATCH_NULL_MASK);
    System.out.println("Glob: *.java");
    printList(dir.list(filter));

    // List all files ending in .class
    filter = new AwkFilenameFilter(".+\\.class");
    System.out.println("Awk: .+\\.class");
    printList(dir.list(filter));

    // List all files ending in .java or .class
    filter = new Perl5FilenameFilter(".+\\.(?:java|class)");
    System.out.println("Perl5: .+\\.(?:java|class)");
    printList(dir.list(filter));
  }

}