Fiz algumas alterações agora tem a opção de escolher acessar via getter/setter ou pelo Field. E ainda é possivel fazer a propria implementação extendendo
package mark.utils.el;
import mark.utils.bean.Formatter;
import mark.utils.el.handler.FieldAccessHandler;
import mark.utils.el.handler.FieldHandler;
import mark.utils.el.handler.MethodHandler;
public class FieldResolver {
private String fieldName;
private String name;
private Formatter formatter;
private FieldAccessHandler method;
public FieldResolver(Class<?> clazz, String fieldName, String name) {
this(clazz, fieldName, name, null);
}
public FieldResolver(Class<?> clazz, String fieldName) {
this(clazz, fieldName, "", null);
}
public FieldResolver(Class<?> clazz, String fieldName, Handler fac) {
this(clazz, fieldName, "", fac);
}
public FieldResolver(Class<?> clazz, String fieldName, String name,
Handler fac) {
if (fac == null)
fac = FIELD_HANDLER;
this.fieldName = fieldName;
this.name = name;
method = fac.getHandler();
method.resolveField(clazz, fieldName);
setFormatter(BASIC_FORMATTER);
}
public void setFormatter(Formatter formatter) {
if (formatter == null)
throw new IllegalArgumentException("Formatter can't be null!");
this.formatter = formatter;
}
public void setValue(Object t, Object value) {
method.setValue(t, value, formatter);
}
public Object getValue(Object t) {
return method.getValue(t, formatter);
}
public String getName() {
return name;
}
public Class<?> getFieldType() {
return method.getFieldType();
}
public String getFieldName() {
return fieldName;
}
public static final Formatter BASIC_FORMATTER = new Formatter() {
@Override
public String format(Object obj) {
if (obj == null)
return "";
return obj.toString();
}
@Override
public Object parse(String obj) {
return obj;
}
};
public static interface Handler {
public FieldAccessHandler getHandler();
}
public static final Handler FIELD_HANDLER = new Handler() {
@Override
public FieldAccessHandler getHandler() {
return new FieldHandler();
}
};
public static final Handler METHOD_HANDLER = new Handler() {
@Override
public FieldAccessHandler getHandler() {
return new MethodHandler();
}
};
}
FieldAcessHandler e implementações.
package mark.utils.el.handler;
import mark.utils.bean.Formatter;
public interface FieldAccessHandler {
public void setValue(Object t, Object value, Formatter formatter);
public Object getValue(Object t, Formatter formatter);
public void resolveField(Class<?> clazz, String expression);
public Class<?> getFieldType();
}
package mark.utils.el.handler;
import java.lang.reflect.Field;
import java.util.LinkedList;
import mark.utils.bean.Formatter;
public class FieldHandler implements FieldAccessHandler {
private LinkedList<Class<?>> classesTrace;
private LinkedList<Field> fields;
public FieldHandler() {
classesTrace = new LinkedList<Class<?>>();
fields = new LinkedList<Field>();
}
@Override
public Object getValue(Object t, Formatter formatter) {
if (t == null)
return null;
Object obj = null;
try {
obj = t;
for (int i = 0; i < fields.size(); i++)
obj = fields.get(i).get(obj);
} catch (Exception e) {
throw new RuntimeException(e);
}
return formatter.format(obj);
}
@Override
public void resolveField(Class<?> clazz, String expression) {
classesTrace.add(clazz);
String[] trace = expression.split("[.]");
for (int i = 0; i < trace.length; i++)
addField(trace[i]);
}
@Override
public void setValue(Object t, Object value, Formatter formatter) {
if (t == null)
return;
Object obj = null;
Field field = null;
try {
obj = t;
int size = fields.size() - 2;
if (size > -1) {
for (int i = 0; i <= size; i++)
obj = fields.get(i).get(obj);
field = fields.get(size + 1);
} else
field = fields.get(0);
field.set(obj, formatter.parse(value.toString()));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private void addField(String fieldName) {
Class<?> clazz = classesTrace.get(classesTrace.size() - 1);
try {
Field f = getAcessibleField(clazz, fieldName);
classesTrace.add(f.getType());
fields.add(f);
} catch (Exception e) {
e.printStackTrace();
}
}
private Field getAcessibleField(Class<?> clazz, String fieldName) {
Field f = null;
try {
f = clazz.getDeclaredField(fieldName);
f.setAccessible(true);
} catch (Exception e) {
throw new RuntimeException(e);
}
return f;
}
@Override
public Class<?> getFieldType() {
return fields.getLast().getType();
}
}
package mark.utils.el.handler;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import mark.utils.bean.Formatter;
public class MethodHandler implements FieldAccessHandler {
private List<HolderGetterValue> holders;
private List<Class<?>> classesTrace;
private SetterHolder setter;
public MethodHandler() {
classesTrace = new ArrayList<Class<?>>();
holders = new ArrayList<HolderGetterValue>();
}
@Override
public Class<?> getFieldType() {
return holders.get(holders.size() - 1).getter.getReturnType();
}
@Override
public Object getValue(Object t, Formatter formatter) {
if (t == null)
return null;
Object obj = null;
try {
obj = holders.get(0).getValue(t);
for (int i = 1; i < holders.size(); i++)
obj = holders.get(i).getValue(obj);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
if (formatter != null)
return formatter.format(obj);
else
return obj;
}
@Override
public void resolveField(Class<?> clazz, String expression) {
classesTrace.add(clazz);
String[] trace = expression.split("[.]");
for (int i = 0; i < trace.length; i++)
addField(trace[i]);
if (holders.size() != trace.length) {
holders.clear();
classesTrace.clear();
throw new RuntimeException("Impossible to resolve field.");
}
setter = new SetterHolder(getSetterMethod(classesTrace.get(classesTrace
.size() - 2), trace[trace.length - 1]));
}
@Override
public void setValue(Object t, Object value, Formatter formatter) {
if (t == null)
return;
Object obj = null;
try {
obj = t;
int size = holders.size() - 2;
if (size > -1)
for (int i = 0; i <= size; i++)
obj = holders.get(i).getValue(obj);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
setter.setValue(obj, value);
}
private void addField(String fieldName) {
Class<?> clazz = classesTrace.get(classesTrace.size() - 1);
try {
Field next = null;
try {
next = clazz.getDeclaredField(fieldName);
} catch (Exception e) {
}
Method m = getGetterMethod(clazz, fieldName, next);
classesTrace.add(m.getReturnType());
holders.add(new HolderGetterValue(m));
} catch (Exception e) {
e.printStackTrace();
}
}
private Method getSetterMethod(Class<?> clazz, String fieldName) {
Method m = null;
try {
try {
m = clazz.getMethod("set"
+ String.valueOf(fieldName.charAt(0)).toUpperCase()
+ fieldName.substring(1), classesTrace.get(classesTrace
.size() - 1));
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
return m;
}
private Method getGetterMethod(Class<?> clazz, String fieldName, Field field) {
Method m = null;
try {
if (field == null) {
try {
m = clazz.getMethod("get"
+ String.valueOf(fieldName.charAt(0)).toUpperCase()
+ fieldName.substring(1));
} catch (Exception e) {
e.printStackTrace();
}
} else if (field.getType().isAssignableFrom(Boolean.class))
m = clazz.getMethod("is"
+ String.valueOf(fieldName.charAt(0)).toUpperCase()
+ fieldName.substring(1));
else
m = clazz.getMethod("get"
+ String.valueOf(fieldName.charAt(0)).toUpperCase()
+ fieldName.substring(1));
} catch (Exception e) {
e.printStackTrace();
}
return m;
}
private static class HolderGetterValue {
private Method getter;
public HolderGetterValue(Method getter) {
this.getter = getter;
}
public Object getValue(Object obj) {
Object value = null;
try {
value = getter.invoke(obj);
} catch (Exception e) {
e.printStackTrace();
}
return value;
}
}
private static class SetterHolder {
private Method setter;
public SetterHolder(Method setter) {
this.setter = setter;
}
public void setValue(Object obj, Object value) {
try {
setter.invoke(obj, value);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}