Source Code Cross Referenced for PropertiesConverter.java in  » XML » xstream-1.3 » com » thoughtworks » xstream » converters » collections » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » xstream 1.3 » com.thoughtworks.xstream.converters.collections 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright (C) 2004, 2005 Joe Walnes.
03:         * Copyright (C) 2006, 2007, 2008 XStream Committers.
04:         * All rights reserved.
05:         *
06:         * The software in this package is published under the terms of the BSD
07:         * style license a copy of which has been included with this distribution in
08:         * the LICENSE.txt file.
09:         * 
10:         * Created on 23. February 2004 by Joe Walnes
11:         */
12:        package com.thoughtworks.xstream.converters.collections;
13:
14:        import com.thoughtworks.xstream.converters.Converter;
15:        import com.thoughtworks.xstream.converters.MarshallingContext;
16:        import com.thoughtworks.xstream.converters.UnmarshallingContext;
17:        import com.thoughtworks.xstream.core.util.Fields;
18:        import com.thoughtworks.xstream.io.HierarchicalStreamReader;
19:        import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
20:
21:        import java.lang.reflect.Field;
22:        import java.util.Iterator;
23:        import java.util.Map;
24:        import java.util.Properties;
25:        import java.util.TreeMap;
26:
27:        /**
28:         * Special converter for java.util.Properties that stores
29:         * properties in a more compact form than java.util.Map.
30:         * <p/>
31:         * <p>Because all entries of a Properties instance
32:         * are Strings, a single element is used for each property
33:         * with two attributes; one for key and one for value.</p>
34:         * <p>Additionally, default properties are also serialized, if they are present.</p>
35:         *
36:         * @author Joe Walnes
37:         * @author Kevin Ring
38:         */
39:        public class PropertiesConverter implements  Converter {
40:
41:            private final static Field defaultsField = Fields.find(
42:                    Properties.class, "defaults");
43:            private final boolean sort;
44:
45:            public PropertiesConverter() {
46:                this (false);
47:            }
48:
49:            public PropertiesConverter(boolean sort) {
50:                this .sort = sort;
51:            }
52:
53:            public boolean canConvert(Class type) {
54:                return Properties.class == type;
55:            }
56:
57:            public void marshal(Object source, HierarchicalStreamWriter writer,
58:                    MarshallingContext context) {
59:                Properties properties = (Properties) source;
60:                Map map = sort ? (Map) new TreeMap(properties)
61:                        : (Map) properties;
62:                for (Iterator iterator = map.entrySet().iterator(); iterator
63:                        .hasNext();) {
64:                    Map.Entry entry = (Map.Entry) iterator.next();
65:                    writer.startNode("property");
66:                    writer.addAttribute("name", entry.getKey().toString());
67:                    writer.addAttribute("value", entry.getValue().toString());
68:                    writer.endNode();
69:                }
70:                Properties defaults = (Properties) Fields.read(defaultsField,
71:                        properties);
72:                if (defaults != null) {
73:                    writer.startNode("defaults");
74:                    marshal(defaults, writer, context);
75:                    writer.endNode();
76:                }
77:            }
78:
79:            public Object unmarshal(HierarchicalStreamReader reader,
80:                    UnmarshallingContext context) {
81:                Properties properties = new Properties();
82:                while (reader.hasMoreChildren()) {
83:                    reader.moveDown();
84:                    if (reader.getNodeName().equals("defaults")) {
85:                        Properties defaults = (Properties) unmarshal(reader,
86:                                context);
87:                        Fields.write(defaultsField, properties, defaults);
88:                    } else {
89:                        String name = reader.getAttribute("name");
90:                        String value = reader.getAttribute("value");
91:                        properties.setProperty(name, value);
92:                    }
93:                    reader.moveUp();
94:                }
95:                return properties;
96:            }
97:
98:        }
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