Re: AspectJ: solution to Java's repetitiveness?
Andrea Francia wrote:
Mark Space wrote:
I also wrote a test program to try to address part of your toString()
issue.
However, Java doesn't allow me to access non-public fields the way I
wanted. So it wasn't useful, as it would require even more boilerplate.
The idea can be adapted to a toString() method that writes all the
JavaBean properties of a class. In this case the access problem is
avoided but the resulting would contents all the javabean properties
that is not always the same of the class properties.
I'm posting the code that illustrate the idea.
However the code below is not complete, it does not handle the indexed
properties at all.
----------------------------------------------------------------
package test;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
class SimpleBean {
private final String name = "John Smith";
private int size = 234;
public String getName() {
return this.name;
}
public int getSize() {
return this.size;
}
@Override
public String toString() {
return Main.toString(this);
}
}
public class Main {
public static String toString(Object o) {
StringBuilder sb = new StringBuilder();
sb.append('[');
sb.append(o.getClass().getSimpleName());
sb.append(": ");
BeanInfo info;
try {
info = Introspector.getBeanInfo(SimpleBean.class);
for (PropertyDescriptor pd : info.getPropertyDescriptors()) {
if (!pd.getName().equals("class")) {
sb.append(pd.getName()).append(":");
try {
sb.append(pd.getReadMethod().invoke(o));
} catch (IllegalAccessException ex) {
sb.append(ex);
} catch (IllegalArgumentException ex) {
sb.append(ex);
} catch (InvocationTargetException ex) {
sb.append(ex);
}
sb.append(", ");
}
}
} catch (IntrospectionException ex) {
sb.append("problems");
}
sb.append(']');
return sb.toString();
}
public static void main(String[] args) {
SimpleBean bean = new SimpleBean();
System.out.println(bean);
}
}
-------------------------------------------------------------------
And the results:
run-single:
[SimpleBean: name:John Smith, size:234, ]
BUILD SUCCESSFUL (total time: 1 second)
--
Andrea Francia
alias rm='trash' #use trash command instead of removing
rm -Rfv file #put the file in the KDE trashcan
http://www.andreafrancia.it/trash