1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.configuration2;
19
20 import java.io.IOException;
21 import java.io.InputStream;
22 import java.io.Reader;
23 import java.io.Writer;
24 import java.util.Map;
25
26 import org.apache.commons.configuration2.ex.ConfigurationException;
27 import org.apache.commons.configuration2.io.InputStreamSupport;
28 import org.apache.commons.configuration2.tree.ImmutableNode;
29
30 import com.fasterxml.jackson.databind.ObjectMapper;
31 import com.fasterxml.jackson.databind.type.MapType;
32
33 /**
34 * <p>
35 * A specialized hierarchical configuration class that is able to parse JSON documents.
36 * </p>
37 *
38 * @since 2.2
39 */
40 public class JSONConfiguration extends AbstractYAMLBasedConfiguration implements FileBasedConfiguration, InputStreamSupport {
41
42 /**
43 * The object mapper used by the {@code JSONConfiguration}.
44 */
45 private final ObjectMapper mapper = new ObjectMapper();
46
47 /**
48 * The {@code MapType} used to convert types.
49 */
50 private final MapType type = mapper.getTypeFactory().constructMapType(Map.class, String.class, Object.class);
51
52 /**
53 * Creates a new instance of {@code JSONConfiguration}.
54 */
55 public JSONConfiguration() {
56 }
57
58 /**
59 * Creates a new instance of {@code JSONConfiguration} as a copy of the specified configuration.
60 *
61 * @param c the configuration to be copied
62 */
63 public JSONConfiguration(final HierarchicalConfiguration<ImmutableNode> c) {
64 super(c);
65 }
66
67 /**
68 * Loads the configuration from the given input stream.
69 *
70 * @param in the input stream
71 * @throws ConfigurationException if an error occurs
72 */
73 @Override
74 public void read(final InputStream in) throws ConfigurationException {
75 try {
76 load(mapper.readValue(in, this.type));
77 } catch (final Exception e) {
78 rethrowException(e);
79 }
80 }
81
82 @Override
83 public void read(final Reader in) throws ConfigurationException {
84 try {
85 load(mapper.readValue(in, this.type));
86 } catch (final Exception e) {
87 rethrowException(e);
88 }
89 }
90
91 @Override
92 public void write(final Writer out) throws ConfigurationException, IOException {
93 this.mapper.writer().writeValue(out, constructMap(getNodeModel().getNodeHandler().getRootNode()));
94 }
95
96 }