1/*
2 * Copyright (C) 2010 Google Inc.
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
17package com.google.clearsilver.jsilver.resourceloader;
18
19import com.google.clearsilver.jsilver.exceptions.JSilverTemplateNotFoundException;
20
21import java.io.IOException;
22import java.io.Reader;
23import java.io.StringReader;
24import java.util.concurrent.ConcurrentHashMap;
25import java.util.concurrent.ConcurrentMap;
26
27/**
28 * ResourceLoader that pulls all items from memory. This is particularly useful for small templates
29 * that can be embedded in code (e.g. in unit tests).
30 *
31 * Content needs to be stored first using the {@link #store(String, String)} method.
32 *
33 * @see ResourceLoader
34 */
35public class InMemoryResourceLoader extends BaseResourceLoader {
36
37  private ConcurrentMap<String, String> items = new ConcurrentHashMap<String, String>();
38
39  @Override
40  public Reader open(String name) throws IOException {
41    String content = items.get(name);
42    return content == null ? null : new StringReader(content);
43  }
44
45  @Override
46  public Reader openOrFail(String name) throws JSilverTemplateNotFoundException, IOException {
47    Reader reader = open(name);
48    if (reader == null) {
49      throw new JSilverTemplateNotFoundException(name);
50    } else {
51      return reader;
52    }
53  }
54
55  public void store(String name, String contents) {
56    items.put(name, contents);
57  }
58
59  public void remove(String name) {
60    items.remove(name);
61  }
62
63  public ConcurrentMap<String, String> getItems() {
64    return items;
65  }
66
67}
68