001: /*
002: * $Id: groups.java,v 1.8 2003/11/07 20:16:23 dfs Exp $
003: *
004: * ====================================================================
005: * The Apache Software License, Version 1.1
006: *
007: * Copyright (c) 2000 The Apache Software Foundation. All rights
008: * reserved.
009: *
010: * Redistribution and use in source and binary forms, with or without
011: * modification, are permitted provided that the following conditions
012: * are met:
013: *
014: * 1. Redistributions of source code must retain the above copyright
015: * notice, this list of conditions and the following disclaimer.
016: *
017: * 2. Redistributions in binary form must reproduce the above copyright
018: * notice, this list of conditions and the following disclaimer in
019: * the documentation and/or other materials provided with the
020: * distribution.
021: *
022: * 3. The end-user documentation included with the redistribution,
023: * if any, must include the following acknowledgment:
024: * "This product includes software developed by the
025: * Apache Software Foundation (http://www.apache.org/)."
026: * Alternately, this acknowledgment may appear in the software itself,
027: * if and wherever such third-party acknowledgments normally appear.
028: *
029: * 4. The names "Apache" and "Apache Software Foundation", "Jakarta-Oro"
030: * must not be used to endorse or promote products derived from this
031: * software without prior written permission. For written
032: * permission, please contact apache@apache.org.
033: *
034: * 5. Products derived from this software may not be called "Apache"
035: * or "Jakarta-Oro", nor may "Apache" or "Jakarta-Oro" appear in their
036: * name, without prior written permission of the Apache Software Foundation.
037: *
038: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
039: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
040: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
041: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
042: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
043: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
044: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
045: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
046: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
047: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
048: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
049: * SUCH DAMAGE.
050: * ====================================================================
051: *
052: * This software consists of voluntary contributions made by many
053: * individuals on behalf of the Apache Software Foundation. For more
054: * information on the Apache Software Foundation, please see
055: * <http://www.apache.org/>.
056: */
057:
058: package examples;
059:
060: import java.io.*;
061: import java.util.*;
062:
063: import org.apache.oro.text.*;
064: import org.apache.oro.text.regex.*;
065:
066: /**
067: * This is a sample program mimicking the Unix groups command. It assumes
068: * the /etc/group file exists.
069: *
070: * @version @version@
071: */
072: public final class groups {
073:
074: public static final void main(String[] args) {
075: int user;
076: MatchActionProcessor processor = new MatchActionProcessor();
077: final Hashtable groups = new Hashtable();
078: Vector users = new Vector();
079: Enumeration usersElements;
080: MatchAction action = new MatchAction() {
081: public void processMatch(MatchActionInfo info) {
082: // Add group name to hashtable entry
083: ((Vector) groups.get(info.match.toString()))
084: .addElement(info.fields.get(0));
085: }
086: };
087:
088: if (args.length == 0) {
089: // No arguments assumes calling user
090: args = new String[1];
091: args[0] = System.getProperty("user.name");
092: }
093:
094: try {
095: processor.setFieldSeparator(":");
096: for (user = 0; user < args.length; user++) {
097: // Screen out duplicates
098: if (!groups.containsKey(args[user])) {
099: groups.put(args[user], new Vector());
100: // We assume usernames contain no special characters
101: processor.addAction(args[user], action);
102: // Add username to Vector to preserve argument order when printing
103: users.addElement(args[user]);
104: }
105: }
106: } catch (MalformedPatternException e) {
107: e.printStackTrace();
108: System.exit(1);
109: }
110:
111: try {
112: processor.processMatches(new FileInputStream("/etc/group"),
113: System.out);
114: } catch (IOException e) {
115: e.printStackTrace();
116: System.exit(1);
117: }
118:
119: usersElements = users.elements();
120:
121: while (usersElements.hasMoreElements()) {
122: String username;
123: Enumeration values;
124:
125: username = (String) usersElements.nextElement();
126: values = ((Vector) groups.get(username)).elements();
127:
128: System.out.print(username + " :");
129: while (values.hasMoreElements()) {
130: System.out.print(" " + values.nextElement());
131: }
132: System.out.println();
133: }
134:
135: System.out.flush();
136: }
137:
138: }
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