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Drools JBoss Rules 5.0 Developer's Guide by Michal Bali, Bogdan Brinzarea

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Appendix B. Custom Operator

We've already seen various operators that can be used within rule conditions. These include, for example, ==, !=, relational operators such as >, <, >= , temporal operators such as after, during, finishes, or others such as matches, which perform regular expression matching. In this section, we'll define our own custom operator.

The == operator uses Object.equals/hashCode methods for comparing objects. However, sometimes we need to test if two objects are actually referring to the same instance. This is slightly faster than Object.equals/hashCode comparison (only slightly faster because the hash code is calculated once for object and then it is cached).

Imagine that we have a rule which matches on an Account

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