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1   /**
2    * Copyright (c) 2008-2012, http://www.snakeyaml.org
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  package org.yaml.snakeyaml;
17  
18  import java.io.ByteArrayOutputStream;
19  import java.io.InputStream;
20  import java.io.OutputStreamWriter;
21  import java.io.UnsupportedEncodingException;
22  import java.nio.charset.Charset;
23  
24  import org.yaml.snakeyaml.constructor.Constructor;
25  
26  public class YamlDocument {
27      public static final String ROOT = "specification/";
28      private String source;
29      private String presentation;
30      private Object nativeData;
31  
32      public YamlDocument(String sourceName, boolean check, Constructor constructor) {
33          InputStream input = YamlDocument.class.getClassLoader().getResourceAsStream(
34                  ROOT + sourceName);
35          if (constructor == null) {
36              constructor = new Constructor();
37          }
38          Yaml yaml = new Yaml(constructor);
39          nativeData = yaml.load(input);
40          ByteArrayOutputStream output = new ByteArrayOutputStream();
41          Charset charset = Charset.forName("UTF-8");
42          yaml.dump(nativeData, new OutputStreamWriter(output, charset));
43          try {
44              presentation = output.toString(charset.name());
45              source = Util.getLocalResource(ROOT + sourceName);
46          } catch (UnsupportedEncodingException e) {
47              throw new RuntimeException(e);
48          }
49          // try to read generated presentation to prove that the presentation
50          // is identical to the source
51          Object result = yaml.load(presentation);
52          if (check && !nativeData.equals(result)) {
53              throw new RuntimeException("Generated presentation is not valid: " + presentation);
54          }
55      }
56  
57      public YamlDocument(String sourceName, boolean check) {
58          this(sourceName, check, null);
59      }
60  
61      public YamlDocument(String sourceName) {
62          this(sourceName, true);
63      }
64  
65      public String getSource() {
66          return source;
67      }
68  
69      public String getPresentation() {
70          return presentation;
71      }
72  
73      public Object getNativeData() {
74          if (nativeData == null) {
75              throw new NullPointerException("No object is parsed.");
76          }
77          return nativeData;
78      }
79  }