blob: 50aaac0e2ff6cf719e7f249e4837cbc63135ff76 [file] [log] [blame]
package aQute.lib.json;
import java.lang.reflect.*;
import java.util.*;
public class ObjectHandler extends Handler {
@SuppressWarnings("rawtypes")
final Class rawClass;
final Field fields[];
final Type types[];
final Object defaults[];
final Field extra;
ObjectHandler(JSONCodec codec, Class< ? > c) throws Exception {
rawClass = c;
fields = c.getFields();
// Sort the fields so the output is canonical
Arrays.sort(fields, new Comparator<Field>() {
public int compare(Field o1, Field o2) {
return o1.getName().compareTo(o2.getName());
}
});
types = new Type[fields.length];
defaults = new Object[fields.length];
Field x = null;
for (int i = 0; i < fields.length; i++) {
if (fields[i].getName().equals("__extra"))
x = fields[i];
types[i] = fields[i].getGenericType();
}
if (x != null && Map.class.isAssignableFrom(x.getType()))
extra = x;
else
extra = null;
try {
Object template = c.newInstance();
for (int i = 0; i < fields.length; i++) {
defaults[i] = fields[i].get(template);
}
}
catch (Exception e) {
// Ignore
}
}
@Override
void encode(Encoder app, Object object, Map<Object,Type> visited) throws Exception {
app.append("{");
String del = "";
for (int i = 0; i < fields.length; i++) {
if (fields[i].getName().startsWith("__"))
continue;
Object value = fields[i].get(object);
if (!app.writeDefaults) {
if (value == defaults[i])
continue;
if (value != null && value.equals(defaults[i]))
continue;
}
app.append(del);
StringHandler.string(app, fields[i].getName());
app.append(":");
app.encode(value, types[i], visited);
del = ",";
}
app.append("}");
}
@SuppressWarnings("unchecked")
@Override
Object decodeObject(Decoder r) throws Exception {
assert r.current() == '{';
Object targetObject = rawClass.newInstance();
int c = r.next();
while (JSONCodec.START_CHARACTERS.indexOf(c) >= 0) {
// Get key
String key = r.codec.parseString(r);
// Get separator
c = r.skipWs();
if (c != ':')
throw new IllegalArgumentException("Expected ':' but got " + (char) c);
c = r.next();
// Get value
Field f = getField(key);
if (f != null) {
// We have a field and thus a type
Object value = r.codec.decode(f.getGenericType(), r);
if (value != null || !r.codec.ignorenull)
f.set(targetObject, value);
} else {
// No field, but may extra is defined
if (extra == null) {
if (r.strict)
throw new IllegalArgumentException("No such field " + key);
Object value = r.codec.decode(null, r);
r.getExtra().put(rawClass.getName() + "." + key, value);
} else {
Map<String,Object> map = (Map<String,Object>) extra.get(targetObject);
if (map == null) {
map = new LinkedHashMap<String,Object>();
extra.set(targetObject, map);
}
Object value = r.codec.decode(null, r);
map.put(key, value);
}
}
c = r.skipWs();
if (c == '}')
break;
if (c == ',') {
c = r.next();
continue;
}
throw new IllegalArgumentException("Invalid character in parsing object, expected } or , but found "
+ (char) c);
}
assert r.current() == '}';
r.read(); // skip closing
return targetObject;
}
private Field getField(String key) {
for (int i = 0; i < fields.length; i++) {
int n = key.compareTo(fields[i].getName());
if (n == 0)
return fields[i];
if (n < 0)
return null;
}
return null;
}
}