1 /*
2 * Copyright 2001,2004 The Apache Software Foundation.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.apache.commons.scaffold.text;
18
19 import java.util.Map;
20
21 /**
22 * Merge utilities.
23 *
24 * @author Ted Husted
25 * @version $Revision: 155464 $ $Date: 2005-02-26 13:26:54 +0000 (Sat, 26 Feb 2005) $
26 */
27 public class Merge {
28
29
30 /**
31 * The token markers for replacement variables, i.e. ${a1}
32 */
33 public static String TOKEN_PREFIX= "${";
34 public static String TOKEN_SUFFIX = "}";
35 private static int TOKEN_PREFIX_LEN = TOKEN_PREFIX.length();
36 private static int TOKEN_SUFFIX_LEN = TOKEN_SUFFIX.length();
37
38
39 /**
40 * Merge a Map of tokens with a template in a StringBuffer.
41 * The parameters are marked by ${key} where (String) Map.get(key)!=null.
42 * The merged content is returned in the same StringBuffer.
43 * Tokens cannot be nested. Unmatched tokens are ignored.
44 *
45 * @param content The text containing merge tokens to be replaced.
46 * @return int Number of replacements made
47 */
48 public static int keys(StringBuffer content, Map tokens) {
49
50 String t = content.toString();
51 int start = t.length();
52 int count = 0;
53
54 while ((start = t.lastIndexOf(TOKEN_PREFIX,start-1)) != -1) {
55
56 int end = t.indexOf(TOKEN_SUFFIX,start);
57 String key = t.substring(start+TOKEN_PREFIX_LEN,end);
58 String value = (String) tokens.get(key);
59 if (value!=null) {
60 content.replace(start,end+TOKEN_SUFFIX_LEN,value);
61 count++;
62 }
63 }
64 return count;
65 }
66 }
67
68 /*
69
70
71 <forward name="bookmark" path = "/do/item/View?key=${key}"/>
72
73 form implements Bookmark;
74
75 forward = findForward("bookmark");
76
77 if (forward!=null) {
78
79 StringBuffer bmPath = new StringBuffer( forward.getPath() );
80
81 merge(bmPath,describe(form));
82
83 Bookmark bmForm = (Bookmark) form;
84 bmForm.setBookmark(bookmark.toString());
85
86 }
87
88 ...
89
90 if (isBookmark())
91 return getBookmarkForward();
92 return findForward("continue");
93
94
95 */