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package httpcli.adapter;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
public class ObjectAdapter<T> {
/** Cache de adaptadores para los objectos. */
private static final Map<Class, ObjectAdapter> objectAdapters =
new HashMap<Class, ObjectAdapter>();
public final Class<T> classOf;
public final FieldAdapter[] fields;
public ObjectAdapter(Class<T> classOf) throws Exception {
this.classOf = classOf;
this.fields = FieldAdapter.fields(classOf);
}
public static <V> ObjectAdapter<V> get(Class<V> classOf) throws Exception {
ObjectAdapter<V> adapter = objectAdapters.get(classOf);
if (adapter == null) {
adapter = new ObjectAdapter<V>(classOf);
set(classOf, adapter);
}
return adapter;
}
public static <V> ObjectAdapter<V> set(Class<V> classOf, ObjectAdapter<V> adapter) {
objectAdapters.put(classOf, adapter);
return adapter;
}
public Map<String, Object> toMap(T src) throws Exception {
if (src == null) return null;
final Map<String, Object> result = new HashMap<String, Object>(fields.length);
fill(src, result);
return result;
}
public <V> void fill(V src, Map<String, Object> dest) throws Exception {
for (int i = 0; i < fields.length; i++) {
FieldAdapter field = fields[i];
String key = field.getName();
Object value = field.get(src);
dest.put(key, value);
}
}
public static class FieldAdapter<T> {
Field field;
Method getMethod;
public FieldAdapter(Field field, Method getMethod) {
this.field = field;
this.getMethod = getMethod;
}
public String getName() {
return field.getName();
}
public T get(Object object) throws Exception {
if (getMethod != null)
return (T) getMethod.invoke(object);
else
return (T) field.get(object);
}
static FieldAdapter[] fields(Class classOf) throws Exception {
final Field[] fs = classOf.getDeclaredFields();
final Method[] m = classOf.getDeclaredMethods();
final FieldAdapter[] result = new FieldAdapter[fs.length];
Method get;
//Method set;
int y = 0;
for (Field f : fs) {
get = findGetMethod(f, m);
//set = OrmUtils.setMethod(f, m);
result[y++] = new FieldAdapter(f, get);
}
final FieldAdapter[] copy = new FieldAdapter[y];
System.arraycopy(result, 0, copy, 0, y);
return copy;
}
public static String capitalize(String str) {
char[] data = str.toCharArray();
data[0] = Character.toUpperCase(data[0]);
return new String(data);
}
public static Method findGetMethod(Field f, Method[] m) throws Exception {
String name = capitalize(f.getName());
String methodnameA = "get" + name;
String methodnameB = "is" + name;
Class[] parameterTypes;
for (Method method : m) {
parameterTypes = method.getParameterTypes();
if (parameterTypes.length > 0) {
continue;
}
if (method.getName().equals(methodnameA)) {
return method;
} else if (method.getName().equals(methodnameB)) {
return method;
}
}
return null;
}
}
} |