README.md

Author: sbglasius

README.md

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+# Phone number constraint for Grails
+
+[![Build](https://github.com/gpc/grails-phone-number-constraint/actions/workflows/build.yml/badge.svg)](https://github.com/gpc/grails-phone-number-constraint/actions/workflows/build.yml)
+
+This plugin establishes a `phoneNumber` constraint property for validateable objects, that being domain objects, and
+objects implementing `grails.validation.Validateable`. It relies on
+Google's [libphonenumber](https://github.com/google/libphonenumber)  Java implementation
+
+## Installation
+
+To use this plugin, add the plugin to `build.gradle`:
+
+```groovy
+dependencies {
+    compile "io.github.gpc:phone-number-constraint:1.0.0"
+}
+
+```
+
+## Example
+
+Here is an example of a command object that uses the plugin:
+
+```groovy
+class PhoneNumber implements Validateable {
+
+    String number
+
+    static constraints = {
+        number nullable: false, phoneNumber: true
+    }
+}
+```
+
+## Configuration
+
+There are three different ways to configure the constraint.
+
+1. With a boolean, `true` or `false` enabling or disabling the constraint
+2. With a string, where the string is the two-letter code for `region`. If set, the constraint is enabled
+3. With a map object, for more configuration. If set, the constraint is enabled
+
+### Configuration by map:
+
+The following table describes the configuration options:
+
+| Config key    | default         | description                                                                                                                                                                                                                                                                    |
+|---------------|-----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `region`      | `US`            | The default region for phone numbers without the international `+xxx` prefix                                                                                                                                                                                                   |
+| `phoneFormat` | `INTERNATIONAL` | How phonenumbers are formatted, if `format` is true. Possible values to be found in [PhoneNumberFormat](https://github.com/google/libphonenumber/blob/a08d3711af51d79d1f9d7d3a12b2049da3a81e20/java/libphonenumber/src/com/google/i18n/phonenumbers/PhoneNumberUtil.java#L463) |
+| `format`      | `false`         | Will update the target object, with the property name with a formatted version of the phone number. If `INTERNATIONAL` is set in `phoneFormat` the international dialing code starting with `+xxx` is written to the field value. _This is an experimental feature_            |       
+
+## PhoneNumberUtil
+
+The class `dk.glasius.phoneconstraint.PhoneNumberUtil` has convenience methods for validating, parsing and formatting a phone-number. This could be used for formatting in the UI of your application.
+
+## Unit-testing your constraints
+
+When running a unit test, the cascade constraint isn't registered with Grails. To work around this issue, the test class
+must implement
+`org.grails.testing.GrailsUnitTest` and the following code must be added to the `setup()` method of the test:
+
+```groovy
+class ParentSpec extends Specification implements GrailsUnitTest {
+
+    @Override
+    Closure doWithSpring() {
+        return {
+            constraintEvaluator(DefaultConstraintEvaluator)
+        }
+    }
+
+    void setup() {
+        PhoneNumberConstraintRegistration.register(applicationContext)
+    }
+
+}
+```
+
+This will register the `PhoneNumberConstraint` the same way as the plugin does at runtime.