1 /*
2 * Copyright (C) 2016 Hobrasoft s.r.o.
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU Affero General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU Affero General Public License for more details.
13 *
14 * You should have received a copy of the GNU Affero General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17 package cz.hobrasoft.pdfmu;
18
19 import com.fasterxml.jackson.databind.ObjectMapper;
20 import com.fasterxml.jackson.databind.SerializationFeature;
21 import java.io.IOException;
22 import java.io.OutputStream;
23
24 /**
25 * An {@link ObjectMapper} that writes JSON documents to an {@link OutputStream}
26 *
27 * <p>
28 * This class is a simple wrapper for {@link ObjectMapper} and
29 * {@link OutputStream}.
30 *
31 * @author <a href="mailto:filip.bartek@hobrasoft.cz">Filip Bartek</a>
32 */
33 public class WritingMapper {
34
35 private final ObjectMapper mapper;
36 private final OutputStream os;
37
38 /**
39 * Creates a {@link WritingMapper}
40 *
41 * @param mapper the {@link ObjectMapper} to use for writing JSON documents
42 * @param os the target {@link OutputStream}
43 */
44 public WritingMapper(ObjectMapper mapper, OutputStream os) {
45 this.mapper = mapper;
46 this.os = os;
47 }
48
49 public WritingMapper() {
50 this.mapper = new ObjectMapper(); // Create a new mapper
51 mapper.enable(SerializationFeature.INDENT_OUTPUT); // Enable nice formatting
52 this.os = System.err; // Bind to `System.err`
53 }
54
55 /**
56 * Serializes a Java value as a JSON output, streaming it to the specified
57 * {@link OutputStream}
58 *
59 * @param value the Java value to be serialized
60 * @throws IOException if the underlying
61 * {@link ObjectMapper#writeValue(OutputStream, Object)} throws an
62 * {@link IOException}
63 */
64 public void writeValue(Object value) throws IOException {
65 mapper.writeValue(os, value);
66 }
67 }