Le dim. 9 juil. 2023 à 19:32, Gary Gregory <garydgreg...@gmail.com> a écrit :
>
> How about the reflection variant? You won't need to edit any of the target
> code.
Thanks, I missed it. [Maybe worth adding a "@see ReflectionDiffBuilder"
tag in "DiffBuilder" (and vice-versa) ?]
However, the output is much too verbose when the "Container" is a
large object. For example, in my case, the number of reported
differences is
11
but the "toString()" outputs a line that is
371397
characters long...
Is there a way to only print the (primitive) fields for which the values
differ? [It seems (?) that if, deep down the composite "Container",
something is different then all the enclosing instances are considered
different (it's true) and printed in full.]
Also, the "MULTI_LINE_STYLE" is somewhat inconsistent: It does
indeed print each field of the top-level object on a new line, but it
does not apply this layout to the "composing" objects: Referring to
the example quoted below, the array "contentArr" would be printed on
a single line (in my use case, that line is 183312 characters long).]
For large objects, this makes it quite difficult to spot what differences
were actually detected...
Regards,
Gilles
>
> Gary
>
>
> On Sun, Jul 9, 2023, 09:51 Gilles Sadowski <gillese...@gmail.com> wrote:
>
> > Hi.
> >
> > In the Javadoc of the "DiffBuilder" class[1]:
> > ---CUT---
> > [...]
> > To use this class, write code as follows:
> >
> > public class Person implements Diffable<Person> {
> > String name;
> > int age;
> > boolean smoker;
> > [...]
> > ---CUT---
> >
> > However, a common use-case would be that we can't directly
> > modify the class whose instances we want to compare.
> > Assuming that interfaces are given and non-modifiable (i.e.
> > they cannot implement "Diffable"):
> > ---CUT---
> > public interface Content {
> > double getValue();
> > }
> >
> > public interface Container {
> > Content[] getContentArray();
> > }
> > ---CUT---
> > and the modifiable user code is similar to
> > ---CUT---
> > public class MyContent implements Content {
> > private final double c;
> >
> > public MyContent(double input) {
> > c = input:
> > }
> >
> > @Override
> > public double getValue() {
> > return c;
> > }
> > }
> >
> > public class MyContainer implements Container {
> > private final Content[] contentArr;
> >
> > MyContainer(double ... inputs) {
> > final int len = inputs.length;
> > contentArr = new Content[len];
> > for (int i = 0; i < len; i++) {
> > contentArr[i] = new MyContent(inputs[i]);
> > }
> > }
> >
> > @Override
> > public Content[] getContentArray() {
> > return contentArr;
> > }
> > }
> > ---CUT---
> > how should I go about in order to get the "diff" between instances
> > of "MyContainer"?
> >
> > Thanks,
> > Gilles
> >
> > [1]
> > https://commons.apache.org/proper/commons-lang/javadocs/api-release/org/apache/commons/lang3/builder/DiffBuilder.html
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