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https://issues.apache.org/jira/browse/LANG-1030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073163#comment-14073163
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Michael Bazos commented on LANG-1030:
-------------------------------------
The use case I mentioned above my team uses this to combine like properties
from different objects. I believe this would also be useful when you need to
normalize a String from input (would be a little cleaner than the ternary
operation). Like I said previously this method is like equals/equalsIgnoreCase
but instead of returning a boolean returns the String itself or some default
value.
Example of normalization for input:
{code}
public void doSomething(String foo) {
//foo either has to be BAR or BAZ...BAZ would be the default if it isn't the
same
String fooNormalized = StringUtils.same("BAR", foo, "BAZ");
//comparing to a ternary operation
String fooNormalized = "BAR".equals(foo) ? "BAR" : "BAZ";
}
{code}
I didn't write the full patch with tests because I wasn't sure if this use case
would warrant something being added to StringUtils and I agree with your last
comment about it bloating StringUtils. We had this use case come up a lot so
figured this would be the right place to start the discussion.
> StringUtils.same opposite method to StringUtils.differ
> ------------------------------------------------------
>
> Key: LANG-1030
> URL: https://issues.apache.org/jira/browse/LANG-1030
> Project: Commons Lang
> Issue Type: Improvement
> Affects Versions: 3.3.2
> Reporter: Michael Bazos
> Priority: Trivial
> Labels: StringUtils
> Fix For: Review Patch, Discussion
>
>
> This is pretty easy to do but I have seen this come up and was surprised to
> find that StringUtils didn't have a utility method.
> The difference() method is described as doing the following:
> Compares two Strings, and returns the portion where they differ.
> What I am proposing is essentially the opposite of the difference method
> called same(). This method would compare two String and return a new String
> when they are the same.
> This is essentially the implementation:
> {code:java}
> public static String same(String str1, String str2) {
> if (str1 != null && StringUtils.equalsIgnoreCase(str1, str2)) {
> return new String(str1);
> }
> return null;
> }
> {code}
> {code:java}
> StringUtils.same(null, null) = null
> StringUtils.same("", "") = "";
> StringUtils.same("123", "") = null
> StringUtils.same("123", "123") = "123";
> {code}
> If there is already a way to do this using the apache lang library please
> point me in the right direction. Otherwise I would be more than happy to do
> the testing, coding and documentation for this.
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