I'm trying to write a method that changes one nested value of object. I think that java reflections are here the best way to do that but I'm having trouble developing the solution. What I'm trying to do is:
package abcClass;
import overwrite.ValueOverwriter;
public class main {
public static void main(String[] args) {
A obj1 = new A();
B bClass = new B();
C cClass = new C();
cClass.setStringValue("XXX");
bClass.setcClass(cClass);
obj1.setbClass(bClass);
E obj2 = new E();
D dClass = new D();
dClass.setSomeInt(10);
obj2.setdClass(dClass);
A newObj1 = (A) ValueOverwriter.overwiteValue(obj1, "bClass.cClass.someString", "YYY");
E newObj2 = (E) ValueOverwriter.overwiteValue(obj2, "dClass.someInt", "20");
}
}
Class with method that I'm trying to implement:
package overwrite;
import abcClass.Abcdef;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;
public class ValueOverwriter {
// String path is path to value that is to be changed like: " aClass.bClass.cClass.stringValue"
public static Abcdef overwiteValue(Abcdef obj, String path, String newValue) {
List<String> propertyAddress = Arrays.asList(path.split("\\."));
StringBuilder methodToInvokeName = new StringBuilder("obj");
for (int i = 0; i < propertyAddress.size() - 1; i++) {
methodToInvokeName.append("." + returnMethodName("get", propertyAddress.get(i)));
}
String setterMethodName = methodToInvokeName.toString() + "." + returnMethodName("set", propertyAddress.get(propertyAddress.size() - 1));
String getterMethodName = methodToInvokeName.toString() + "." + returnMethodName("get", propertyAddress.get(propertyAddress.size() - 1));
try {
Method setterMethod = obj.getClass().getMethod(setterMethodName);
setterMethod.invoke(obj, newValue);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
return obj;
}
private static String returnMethodName(String method, String field) {
return method + field.substring(0, 1)
.toUpperCase() + field.substring(1);
}
}
And some simple classes:
Abcdef interface:
package abcClass;
public interface Abcdef {
}
A class:
package abcClass;
public class A implements Abcdef{
private B bClass;
public B getbClass() {
return bClass;
}
public void setbClass(B bClass) {
this.bClass = bClass;
}
}
B class:
package abcClass;
public class B{
private C cClass;
public C getcClass() {
return cClass;
}
public void setcClass(C cClass) {
this.cClass = cClass;
}
}
C class:
package abcClass;
public class C{
private String stringValue = "some String";
public String getStringValue() {
return stringValue;
}
public void setStringValue(String stringValue) {
this.stringValue = stringValue;
}
}
D class:
package abcClass;
public class D {
private int someInt = 10;
public int getSomeInt() {
return someInt;
}
public void setSomeInt(int someInt) {
this.someInt = someInt;
}
}
E class:
package abcClass;
public class E implements Abcdef{
private D dClass;
public D getdClass() {
return dClass;
}
public void setdClass(D bClass) {
this.dClass = bClass;
}
}
I need that this method would be able to handle different value types, maybe I should do interface with OverRider for such?
Now I'm getting Exception:
"C:\Program Files\Java\jdk1.8.0_191\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.3.2\lib\idea_rt.jar=64108:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.3.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_191\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_191\jre\lib\rt.jar;C:\Users\karolina.kosmala\batchWorkspace\spring-batch-master\field_overwrite\target\classes;C:\Users\karolina.kosmala\.m2\repository\org\springframework\spring-beans\5.2.3.RELEASE\spring-beans-5.2.3.RELEASE.jar;C:\Users\karolina.kosmala\.m2\repository\org\springframework\spring-core\5.2.3.RELEASE\spring-core-5.2.3.RELEASE.jar;C:\Users\karolina.kosmala\.m2\repository\org\springframework\spring-jcl\5.2.3.RELEASE\spring-jcl-5.2.3.RELEASE.jar" abcClass.main
java.lang.NoSuchMethodException: abcClass.A.obj.getBClass.getCClass.setSomeString()
at java.lang.Class.getMethod(Class.java:1786)
at overwrite.ValueOverwriter.overwiteValue(ValueOverwriter.java:25)
at abcClass.main.main(main.java:19)
java.lang.NoSuchMethodException: abcClass.E.obj.getDClass.setSomeInt()
at java.lang.Class.getMethod(Class.java:1786)
at overwrite.ValueOverwriter.overwiteValue(ValueOverwriter.java:25)
at abcClass.main.main(main.java:20)
Process finished with exit code 0
Aucun commentaire:
Enregistrer un commentaire