1 /*

     2  * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package com.sun.tools.javac.util;

    27 

    28 import java.util.regex.Pattern;

    29 import javax.lang.model.SourceVersion;

    30 

    31 /**Utilities to convert an import-like string to a regexp.

    32  *

    33  *  <p><b>This is NOT part of any supported API.

    34  *  If you write code that depends on this, you do so at your own risk.

    35  *  This code and its internal interfaces are subject to change or

    36  *  deletion without notice.</b>

    37  */

    38 public class MatchingUtils {

    39     private static final Pattern allMatches = Pattern.compile(".*");

    40 

    41     /**

    42      * Return true if the argument string is a valid import-style

    43      * string specifying claimed annotations; return false otherwise.

    44      */

    45     public static boolean isValidImportString(String s) {

    46         if (s.equals("*"))

    47             return true;

    48 

    49         boolean valid = true;

    50         String t = s;

    51         int index = t.indexOf('*');

    52 

    53         if (index != -1) {

    54             // '*' must be last character...

    55             if (index == t.length() -1) {

    56                 // ... any and preceding character must be '.'

    57                 if ( index-1 >= 0 ) {

    58                     valid = t.charAt(index-1) == '.';

    59                     // Strip off ".*$" for identifier checks

    60                     t = t.substring(0, t.length()-2);

    61                 }

    62             } else

    63                 return false;

    64         }

    65 

    66         // Verify string is off the form (javaId \.)+ or javaId

    67         if (valid) {

    68             String[] javaIds = t.split("\\.", t.length()+2);

    69             for(String javaId: javaIds)

    70                 valid &= SourceVersion.isIdentifier(javaId);

    71         }

    72         return valid;

    73     }

    74 

    75     public static Pattern validImportStringToPattern(String s) {

    76         if (s.equals("*")) {

    77             return allMatches;

    78         } else {

    79             String s_prime = s.replace(".", "\\.");

    80 

    81             if (s_prime.endsWith("*")) {

    82                 s_prime =  s_prime.substring(0, s_prime.length() - 1) + ".+";

    83             }

    84 

    85             return Pattern.compile(s_prime);

    86         }

    87     }

    88 

    89 }