thoerup/webconfig/ConfigLoader.java

package dk.thoerup.webconfig;


import java.lang.reflect.Field;


abstract public class ConfigLoader {
        // TODO: should this class be enhanced with a saveConfig() and a setValue() ?? 


        public abstract String getValue(String paramName);

        public void loadConfig(Object configObject) {

                Field fields[] = configObject.getClass().getDeclaredFields();

                for(Field field : fields) {
                        field.setAccessible(true);

                        ConfigVariable anno = field.getAnnotation(ConfigVariable.class);
                        if (anno == null)
                                continue;
                        
                        String propertyName = anno.propertyname().equals("") ? field.getName() : anno.propertyname();

                        String value = getValue( propertyName );
                        if (value == null) {
                                //TODO: find another exception to throw here
                                throw new RuntimeException("Could not find a value to this field: " + field.getName() );
                        }

                        setFieldValue(field,configObject,value);
                }

        }

        public static void setFieldValue(Field field, Object configObject, String value) {

                field.setAccessible(true);
                try {

                        if (field.getType().getName().equals("int") ) {
                                field.setInt(configObject, Integer.parseInt(value) );
                        } else if (field.getType().getName().equals("boolean") ) {
                                value = value.toLowerCase();
                                if (! (value.equals("true") || value.equals("false"))) {
                                        //TODO: Find another exception to throw here
                                        throw new RuntimeException("Only 'true' or 'false' as values for boolean field");
                                }
                                field.setBoolean(configObject, Boolean.parseBoolean(value) );
                        } else if (field.getType().getName().equals("long") ) {
                                field.setLong(configObject, Long.parseLong(value) );
                        } else if (field.getType().getName().equals("short") ) {
                                field.setShort(configObject, Short.parseShort(value) );
                        } else if (field.getType().getName().equals("double") ) {
                                field.setDouble(configObject, Double.parseDouble(value) );
                        } else if (field.getType().getName().equals("float") ) {
                                field.setFloat(configObject, Float.parseFloat(value) );
                        } else if (field.getType().getName().equals("char") ) {
                                field.setFloat(configObject, value.charAt(0) );
                        } else {
                                field.set(configObject, value );
                        }
                } catch (IllegalAccessException e) {
                        //this should never happen since we already have called setAccessible(true)
                        throw new RuntimeException("How did we get here?", e);
                }
        }

}
1	package dk.thoerup.webconfig;
2
3
4	import java.lang.reflect.Field;
5
6
7
8	abstract public class ConfigLoader {
9	// TODO: should this class be enhanced with a saveConfig() and a setValue() ??
10
11
12	public abstract String getValue(String paramName);
13
14	public void loadConfig(Object configObject) {
15
16	Field fields[] = configObject.getClass().getDeclaredFields();
17
18	for(Field field : fields) {
19	field.setAccessible(true);
20
21	ConfigVariable anno = field.getAnnotation(ConfigVariable.class);
22	if (anno == null)
23	continue;
24
25	String propertyName = anno.propertyname().equals("") ? field.getName() : anno.propertyname();
26
27	String value = getValue( propertyName );
28	if (value == null) {
29	//TODO: find another exception to throw here
30	throw new RuntimeException("Could not find a value to this field: " + field.getName() );
31	}
32
33	setFieldValue(field,configObject,value);
34	}
35
36	}
37
38	public static void setFieldValue(Field field, Object configObject, String value) {
39
40	field.setAccessible(true);
41	try {
42
43	if (field.getType().getName().equals("int") ) {
44	field.setInt(configObject, Integer.parseInt(value) );
45	} else if (field.getType().getName().equals("boolean") ) {
46	value = value.toLowerCase();
47	if (! (value.equals("true") \|\| value.equals("false"))) {
48	//TODO: Find another exception to throw here
49	throw new RuntimeException("Only 'true' or 'false' as values for boolean field");
50	}
51	field.setBoolean(configObject, Boolean.parseBoolean(value) );
52	} else if (field.getType().getName().equals("long") ) {
53	field.setLong(configObject, Long.parseLong(value) );
54	} else if (field.getType().getName().equals("short") ) {
55	field.setShort(configObject, Short.parseShort(value) );
56	} else if (field.getType().getName().equals("double") ) {
57	field.setDouble(configObject, Double.parseDouble(value) );
58	} else if (field.getType().getName().equals("float") ) {
59	field.setFloat(configObject, Float.parseFloat(value) );
60	} else if (field.getType().getName().equals("char") ) {
61	field.setFloat(configObject, value.charAt(0) );
62	} else {
63	field.set(configObject, value );
64	}
65	} catch (IllegalAccessException e) {
66	//this should never happen since we already have called setAccessible(true)
67	throw new RuntimeException("How did we get here?", e);
68	}
69	}
70
71	}