1 /*
2  * Copyright (C) 2012 The Android Open Source Project
3  *
4  * Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
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 package com.android.ide.eclipse.adt.internal.wizards.templates;
17 
18 import freemarker.template.SimpleScalar;
19 import freemarker.template.TemplateMethodModel;
20 import freemarker.template.TemplateModel;
21 import freemarker.template.TemplateModelException;
22 
23 import java.util.List;
24 
25 /**
26  * Method invoked by FreeMarker to extract letters from a string; this will remove
27  * any whitespace, punctuation and digits.
28  */
29 public class FmExtractLettersMethod implements TemplateMethodModel {
30     @Override
exec(List args)31     public TemplateModel exec(List args) throws TemplateModelException {
32         if (args.size() != 1) {
33             throw new TemplateModelException("Wrong arguments");
34         }
35         String string = args.get(0).toString();
36         StringBuilder sb = new StringBuilder(string.length());
37         for (int i = 0, n = string.length(); i < n; i++) {
38             char c = string.charAt(i);
39             if (Character.isLetter(c)) {
40                 sb.append(c);
41             }
42         }
43         return new SimpleScalar(sb.toString());
44     }
45 }