codereligion / diff

Allows to diff two arbitrary Java objects and retrieve the diff result as a list of strings.

Diff

Allows to diff any two Java objects and retrieve the diff result as a list of strings. The result is a unified diff without any contextual lines.

Requirements

• Java 1.6 or higher
• dependencies see maven pom

Example code

    SomeDomainObject base = getPersistedObject();
    SomeDomainObject working = getManipulatedObject();

    Configuration configuration = new Configuration()
        .excludeProperty("someUnwantedPropertyName")
        .useSerializer(new SomeSerializer())
        .useComparator(new SomeComparator())
        .useNaturalOrderingFor(SomeComparable.class)
        .useBaseObjectName("BaseObject")
        .useWorkingObjectName("WorkingObject");
		
    List<String> differences = new Differ(configuration).diff(base, working);

    for (String diff : differences) {
        System.out.println(diff);
    }
	...

Example output

--- BaseObject
+++ WorkingObject
@@ -1,1 +1,4 @@
-SomeDomainObject.someIntegerProperty='21'
+SomeDomainObject.someIntegerProperty='42'
+SomeDomainObject.someIterableProperty[0]='foo'
+SomeDomainObject.someIterableProperty[1]='bar'
+SomeDomainObject.someMapProperty['someMapKey']='someMapValue'
...

For more details have a look at the wiki.